/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --bg-deep: #050507;
  --bg-base: #0a0a0f;
  --bg-card: #101018;
  --bg-soft: rgba(255, 255, 255, 0.03);
  --cyan: #00e5ff;
  --purple: #a855f7;
  --pink: #ff2d78;
  --text-main: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-cyan: 0 0 32px rgba(0, 229, 255, 0.12);
  --shadow-purple: 0 0 32px rgba(168, 85, 247, 0.16);
  --gradient-line: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
  --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --space-section: 96px;
}

/* ===== Reset / Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-cn);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease-out;
}
ul, ol {
  list-style: none;
}
button, input, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  background: none;
}
button {
  cursor: pointer;
}
input, select {
  outline: none;
}
h1, h2, h3, h4 {
  line-height: 1.25;
  letter-spacing: -0.01em;
}

/* ===== 容器 ===== */
.container {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 通用板块 ===== */
.section {
  padding: var(--space-section) 0;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  position: relative;
  padding-left: 20px;
}
.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  border-radius: 4px;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
}
.section-head p {
  color: var(--text-secondary);
  max-width: 420px;
  font-size: 0.9375rem;
}
.section-link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}
.section-link:hover {
  color: var(--cyan);
}
.section-link svg {
  width: 16px;
  height: 16px;
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--cyan);
  color: #060a0c;
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  padding: 14px 28px;
  border-radius: 12px;
  transition: filter 0.2s ease-out, box-shadow 0.2s ease-out, transform 0.2s ease-out;
  box-shadow: 0 0 0 rgba(0, 229, 255, 0);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
  transform: translateY(-1px);
}
.btn-primary:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 14px 28px;
  border-radius: 12px;
  transition: border-color 0.2s ease-out, box-shadow 0.2s ease-out, transform 0.2s ease-out;
}
.btn-ghost:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.15);
  transform: translateY(-1px);
}
.btn-ghost:focus-visible {
  outline: 2px solid rgba(0, 229, 255, 0.6);
  outline-offset: 2px;
}
.btn-sm {
  padding: 10px 18px;
  font-size: 0.875rem;
  border-radius: 10px;
}
.btn-block {
  width: 100%;
}

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.9);
  flex-shrink: 0;
}
.brand-text {
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 10px 0;
  transition: color 0.2s ease-out;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.7);
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}
.nav-link:hover {
  color: var(--text-main);
}
.nav-link.active {
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
}
.nav-link.active::after {
  opacity: 1;
  transform: scaleX(1);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.nav-toggle span {
  width: 16px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  z-index: 99;
  background: #0d0d14;
  border-bottom: 1px solid rgba(0, 229, 255, 0.25);
  padding: 16px 24px 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}
.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu .nav-link {
  display: block;
  padding: 14px 8px;
  font-size: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.mobile-menu .nav-link.active {
  color: var(--cyan);
}
.mobile-menu .btn-primary {
  margin-top: 16px;
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 72px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  opacity: 0.18;
  z-index: 0;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(10, 10, 15, 0.92) 0%, rgba(10, 10, 15, 0.55) 60%, rgba(10, 10, 15, 0.4) 100%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 60px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 72px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--cyan);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 28px;
}
.hero-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.8);
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero h1 .gradient {
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 480px;
  line-height: 1.8;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-meta {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.hero-meta strong {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  display: block;
  line-height: 1.2;
}
.hero-meta span {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 1;
}
.hero-glow-1 {
  width: 360px;
  height: 360px;
  background: rgba(0, 229, 255, 0.15);
  top: 15%;
  right: 8%;
}
.hero-glow-2 {
  width: 300px;
  height: 300px;
  background: rgba(168, 85, 247, 0.13);
  bottom: 5%;
  left: 40%;
}

/* ===== 权益对比 ===== */
.compare-section {
  position: relative;
  background: var(--bg-base);
}
.tier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.tier-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}
.tier-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--shadow-cyan);
}
.tier-card.tier-recommend {
  border-color: rgba(168, 85, 247, 0.35);
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.1), var(--bg-card) 40%);
  animation: breathe-glow 3s ease-in-out infinite;
}
.tier-recommend .tier-tag {
  background: var(--gradient-line);
  color: #fff;
  border: none;
}
@keyframes breathe-glow {
  0%, 100% {
    box-shadow: 0 0 24px rgba(168, 85, 247, 0.15);
  }
  50% {
    box-shadow: 0 0 40px rgba(168, 85, 247, 0.3);
  }
}
.tier-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.tier-head h3 {
  font-size: 1.375rem;
  font-weight: 700;
}
.tier-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
}
.tier-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.tier-price {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 24px;
  color: var(--text-main);
}
.tier-price small {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-left: 4px;
}
.tier-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex: 1;
}
.tier-features li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding-bottom: 10px;
}
.tier-features li span {
  color: var(--text-secondary);
}
.tier-features li em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-main);
}
.tier-features li em.off {
  color: var(--text-muted);
}
.tier-card .btn-tier {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.tier-card .btn-tier:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.15);
}
.tier-recommend .btn-tier {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #060a0c;
  font-weight: 700;
}
.tier-recommend .btn-tier:hover {
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
}

/* ===== 等级亮点 ===== */
.levels-section {
  background: var(--bg-deep);
  position: relative;
  overflow: hidden;
}
.levels-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.level-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 32px;
  position: relative;
  transition: transform 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}
.level-item:nth-child(even) {
  transform: translateY(24px);
}
.level-item:hover {
  transform: translateY(-4px);
  border-color: rgba(168, 85, 247, 0.4);
  box-shadow: var(--shadow-purple);
}
.level-item:nth-child(even):hover {
  transform: translateY(20px);
}
.level-num {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
  opacity: 0.85;
  margin-bottom: 16px;
}
.level-name {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.level-name::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--purple);
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.6);
}
.level-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 专属内容预览 ===== */
.preview-section {
  background: var(--bg-base);
}
.preview-wrap {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 64px;
  align-items: center;
}
.preview-left .btn-primary {
  margin-top: 24px;
}
.preview-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.preview-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.preview-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex-shrink: 0;
}
.preview-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.preview-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 16/10;
  transition: border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}
.preview-card:nth-child(2) {
  transform: translateY(32px);
}
.preview-card:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-cyan);
}
.preview-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease-out;
}
.preview-card:hover img {
  transform: scale(1.04);
}
.preview-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(5, 5, 7, 0.35), rgba(5, 5, 7, 0.82));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.lock-icon {
  width: 44px;
  height: 44px;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.preview-card:hover .lock-icon {
  border-color: var(--cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
  background: rgba(0, 229, 255, 0.08);
}
.lock-icon svg {
  width: 18px;
  height: 18px;
  stroke: rgba(255, 255, 255, 0.6);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.2s;
}
.preview-card:hover .lock-icon svg {
  stroke: var(--cyan);
}
.member-badge {
  background: rgba(0, 229, 255, 0.15);
  border: 1px solid rgba(0, 229, 255, 0.35);
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.preview-title {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  font-size: 0.875rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* ===== 最新资讯 ===== */
.news-section {
  background: var(--bg-base);
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: background 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
  position: relative;
}
.news-card:hover {
  background: rgba(16, 16, 24, 0.85);
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--shadow-cyan);
}
.news-card-link {
  display: flex;
  gap: 24px;
  align-items: center;
}
.news-thumb {
  width: 180px;
  height: 100px;
  border-radius: 12px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border);
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.news-body {
  flex: 1;
  min-width: 0;
}
.news-cat {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--cyan);
  background: rgba(0, 229, 255, 0.1);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.news-body h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s;
}
.news-card:hover .news-body h3 {
  color: var(--cyan);
}
.news-body p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-time {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.empty-state {
  background: var(--bg-card);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 60px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.empty-state .empty-icon {
  display: block;
  width: 40px;
  height: 40px;
  margin: 0 auto 16px;
  border-radius: 12px;
  border: 1.5px solid var(--text-muted);
  position: relative;
}
.empty-state .empty-icon::before,
.empty-state .empty-icon::after {
  content: "";
  position: absolute;
  background: var(--text-muted);
}
.empty-state .empty-icon::before {
  width: 2px;
  height: 14px;
  left: 18px;
  top: 8px;
}
.empty-state .empty-icon::after {
  width: 14px;
  height: 2px;
  left: 12px;
  bottom: 8px;
}

/* ===== FAQ ===== */
.faq-section {
  background: var(--bg-deep);
}
.faq-list {
  max-width: 768px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.faq-item:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  transition: color 0.2s;
}
.faq-question:hover {
  color: var(--cyan);
}
.faq-item.active .faq-question {
  color: var(--cyan);
}
.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  transition: transform 0.2s ease-out, border-color 0.2s ease-out;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  border-color: var(--cyan);
}
.faq-icon svg {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 1.8;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}
.faq-answer-inner {
  padding: 0 0 20px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
}
.faq-item.active .faq-answer {
  max-height: 240px;
}

/* ===== CTA 表单 ===== */
.cta-section {
  background: var(--bg-deep);
  position: relative;
  overflow: hidden;
  border-top: 1px solid transparent;
  background-image: radial-gradient(600px 240px at 20% 0%, rgba(0, 229, 255, 0.08), transparent 70%),
                    radial-gradient(500px 200px at 80% 100%, rgba(168, 85, 247, 0.08), transparent 70%);
}
.cta-section::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5), transparent);
}
.cta-inner {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: 64px;
  align-items: center;
  padding-top: 80px;
  padding-bottom: 80px;
}
.cta-left h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}
.cta-left > p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 28px;
}
.cta-points {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.cta-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.cta-points li::before {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.cta-points li::after {
  content: "";
  margin-left: -26px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex-shrink: 0;
}
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-group input,
.form-group select {
  width: 100%;
  background: #12121a;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.9375rem;
  color: var(--text-main);
  transition: border-color 0.2s ease-out, box-shadow 0.2s ease-out;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.2);
}
.form-group input::placeholder {
  color: var(--text-muted);
}
.form-safe {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 16px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}
.footer-brand {
  font-size: 1.0625rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 280px;
}
.footer-col h3 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-col a:hover {
  color: var(--cyan);
}
.footer-contact p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 24px 0;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-muted);
}
.footer-bottom a:hover {
  color: var(--cyan);
}
.footer-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.4), rgba(168, 85, 247, 0.4), transparent);
}

/* ===== 响应式 ===== */
@media (max-width: 1023px) {
  :root {
    --space-section: 64px;
  }
  .main-nav {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .mobile-menu.open {
    display: block;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 48px;
  }
  .hero {
    min-height: auto;
  }
  .hero-meta {
    gap: 32px;
  }
  .tier-grid {
    gap: 16px;
  }
  .tier-card {
    padding: 24px 20px;
  }
  .preview-wrap {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .preview-right {
    grid-template-columns: 1fr 1fr;
  }
  .cta-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 767px) {
  :root {
    --space-section: 48px;
  }
  .container {
    padding: 0 16px;
  }
  .section-head {
    margin-bottom: 32px;
  }
  .section-head h2 {
    font-size: 1.6rem;
  }
  .hero-inner {
    padding-top: 32px;
    padding-bottom: 48px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero-sub {
    font-size: 0.9375rem;
  }
  .hero-actions {
    gap: 12px;
  }
  .hero-meta {
    gap: 24px;
  }
  .hero-meta strong {
    font-size: 1.375rem;
  }
  .tier-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .levels-wrap {
    grid-template-columns: 1fr;
  }
  .level-item:nth-child(even) {
    transform: translateY(0);
  }
  .level-item:nth-child(even):hover {
    transform: translateY(-4px);
  }
  .preview-right {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .preview-card:nth-child(2) {
    transform: translateY(0);
  }
  .news-card-link {
    flex-direction: column;
    align-items: flex-start;
  }
  .news-thumb {
    width: 100%;
    height: 160px;
  }
  .news-body h3 {
    white-space: normal;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .form-card {
    padding: 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* roulang page: category1 */
:root {
      --bg-deep: #050507;
      --bg-base: #0a0a0f;
      --bg-card: #101018;
      --bg-soft: rgba(255, 255, 255, 0.03);
      --cyan: #00e5ff;
      --violet: #a855f7;
      --rose: #ff2d78;
      --text-main: #f4f4f5;
      --text-mut: #a1a1aa;
      --text-dim: #52525b;
      --border: rgba(255, 255, 255, 0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 10px;
      --transition: 200ms ease-out;
      --neon-grad: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      font-size: 15px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition);
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    input,
    select,
    textarea {
      font-family: inherit;
    }

    .container {
      max-width: 80rem;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* ===== Header / Nav ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: 72px;
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      border-image: var(--neon-grad) 1;
      border-image-slice: 1;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 80rem;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand-dot {
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--cyan);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
      display: inline-block;
    }

    .brand-text {
      font-size: 1.05rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--text-main);
      white-space: nowrap;
    }

    .main-nav ul {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }

    .nav-link {
      position: relative;
      font-size: 0.9rem;
      font-weight: 400;
      color: var(--text-mut);
      padding: 4px 2px;
      transition: color var(--transition);
    }

    .nav-link:hover {
      color: var(--text-main);
    }

    .nav-link.active {
      color: var(--cyan);
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      left: 0;
      right: 0;
      bottom: -2px;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 8px rgba(0, 229, 255, 0.8);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      background: var(--cyan);
      color: #06060a;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 10px 22px;
      transition: all var(--transition);
      border: none;
    }

    .btn-primary:hover {
      background: #66f0ff;
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
      transform: translateY(-1px);
    }

    .btn-primary:focus-visible {
      outline: 2px solid #fff;
      outline-offset: 2px;
    }

    .btn-sm {
      padding: 8px 18px;
      font-size: 0.85rem;
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.2);
      color: var(--text-main);
      font-size: 0.9rem;
      padding: 10px 22px;
      transition: all var(--transition);
      background: transparent;
    }

    .btn-outline:hover {
      border-color: var(--cyan);
      color: var(--cyan);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
    }

    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 40px;
      height: 40px;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-toggle span {
      width: 20px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: all var(--transition);
    }

    .nav-toggle.open span:nth-child(1) {
      transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.open span:nth-child(2) {
      opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
      transform: rotate(-45deg) translate(5px, -5px);
    }

    /* ===== Mobile Nav ===== */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      background: #0d0d14;
      border-bottom: 1px solid transparent;
      border-image: var(--neon-grad) 1;
      border-image-slice: 1;
      padding: 24px 20px;
      z-index: 99;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    }

    .mobile-menu.open {
      display: block;
    }

    .mobile-menu ul {
      list-style: none;
    }

    .mobile-menu li {
      margin-bottom: 12px;
    }

    .mobile-menu a {
      display: block;
      padding: 10px 12px;
      border-radius: 8px;
      color: var(--text-mut);
      font-size: 0.95rem;
      transition: all var(--transition);
    }

    .mobile-menu a:hover,
    .mobile-menu a.active {
      color: var(--cyan);
      background: rgba(0, 229, 255, 0.06);
    }

    /* ===== Hero ===== */
    .page-hero {
      position: relative;
      padding-top: 160px;
      padding-bottom: 80px;
      background-image: linear-gradient(rgba(10, 10, 15, 0.88), rgba(5, 5, 7, 0.96)), url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      overflow: hidden;
    }

    .page-hero::after {
      content: '';
      position: absolute;
      top: -40%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.12), transparent 70%);
      pointer-events: none;
    }

    .page-hero .container {
      position: relative;
      z-index: 2;
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.8rem;
      color: var(--text-dim);
      margin-bottom: 20px;
    }

    .breadcrumb a {
      color: var(--text-mut);
    }

    .breadcrumb a:hover {
      color: var(--cyan);
    }

    .breadcrumb span {
      color: var(--text-dim);
    }

    .page-hero h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .page-hero h1 .hero-badge {
      font-size: 0.75rem;
      font-weight: 500;
      background: rgba(0, 229, 255, 0.1);
      color: var(--cyan);
      border: 1px solid rgba(0, 229, 255, 0.3);
      padding: 4px 12px;
      border-radius: 999px;
      letter-spacing: 0.02em;
      vertical-align: middle;
    }

    .page-hero .lead {
      font-size: clamp(1rem, 2vw, 1.15rem);
      color: var(--text-mut);
      max-width: 660px;
      line-height: 1.7;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* ===== Section Base ===== */
    .section {
      padding: 96px 0;
    }

    .section-tight {
      padding: 64px 0;
    }

    .section-head {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 48px;
    }

    .section-head h2 {
      font-size: clamp(1.75rem, 3vw, 2.5rem);
      font-weight: 700;
      line-height: 1.3;
      position: relative;
      padding-left: 16px;
    }

    .section-head h2::before {
      content: '';
      position: absolute;
      left: 0;
      top: 6px;
      bottom: 6px;
      width: 4px;
      border-radius: 4px;
      background: linear-gradient(180deg, var(--cyan), var(--violet));
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
    }

    .section-sub {
      color: var(--text-mut);
      font-size: 0.95rem;
      max-width: 520px;
    }

    /* ===== Cards ===== */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card-grid.two {
      grid-template-columns: repeat(2, 1fr);
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all var(--transition);
      position: relative;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 255, 0.4);
      box-shadow: 0 0 32px rgba(0, 229, 255, 0.12);
    }

    .card .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid rgba(0, 229, 255, 0.15);
      margin-bottom: 20px;
      color: var(--cyan);
      font-size: 1.5rem;
    }

    .card h3 {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card p {
      font-size: 0.9rem;
      color: var(--text-mut);
      line-height: 1.7;
      margin-bottom: 0;
    }

    .tag {
      display: inline-block;
      background: rgba(0, 229, 255, 0.1);
      color: var(--cyan);
      border-radius: 999px;
      font-size: 0.75rem;
      padding: 4px 12px;
      font-weight: 500;
      letter-spacing: 0.02em;
    }

    .tag-violet {
      background: rgba(168, 85, 247, 0.12);
      color: var(--violet);
      border: 1px solid rgba(168, 85, 247, 0.2);
    }

    .tag-rose {
      background: rgba(255, 45, 120, 0.1);
      color: var(--rose);
      border: 1px solid rgba(255, 45, 120, 0.2);
    }

    /* ===== Steps / Timeline ===== */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      counter-reset: step;
    }

    .step-item {
      position: relative;
      padding: 28px 24px;
      border-radius: var(--radius-lg);
      background: var(--bg-card);
      border: 1px solid var(--border);
      transition: all var(--transition);
    }

    .step-item:hover {
      border-color: rgba(0, 229, 255, 0.4);
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.08);
    }

    .step-num {
      font-family: 'JetBrains Mono', 'SFMono-Regular', monospace;
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--cyan);
      line-height: 1;
      margin-bottom: 16px;
      display: block;
      opacity: 0.85;
    }

    .step-item h3 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.875rem;
      color: var(--text-mut);
      line-height: 1.65;
    }

    /* ===== Two Column Feature ===== */
    .feature-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .feature-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      position: relative;
      min-height: 320px;
      background-size: cover;
      background-position: center;
    }

    .feature-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10, 10, 15, 0.2), rgba(10, 10, 15, 0.6));
    }

    .feature-content h2 {
      font-size: clamp(1.75rem, 3vw, 2.25rem);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      padding-left: 16px;
      position: relative;
    }

    .feature-content h2::before {
      content: '';
      position: absolute;
      left: 0;
      top: 6px;
      bottom: 6px;
      width: 4px;
      border-radius: 4px;
      background: linear-gradient(180deg, var(--cyan), var(--violet));
    }

    .feature-content p {
      color: var(--text-mut);
      font-size: 0.95rem;
      line-height: 1.75;
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }

    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      font-size: 0.9rem;
      color: var(--text-mut);
      transition: color var(--transition);
    }

    .feature-list li:hover {
      color: var(--text-main);
    }

    .feature-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      border-radius: 2px;
      background: var(--cyan);
      margin-top: 8px;
      flex-shrink: 0;
      box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
    }

    /* ===== Checklist ===== */
    .checklist {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .check-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 16px 20px;
      background: var(--bg-soft);
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      font-size: 0.9rem;
      color: var(--text-main);
      transition: all var(--transition);
    }

    .check-item:hover {
      border-color: rgba(0, 229, 255, 0.3);
      background: rgba(0, 229, 255, 0.03);
    }

    .check-item .check-icon {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(0, 229, 255, 0.15);
      color: var(--cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.7rem;
      flex-shrink: 0;
    }

    /* ===== FAQ ===== */
    .faq-list {
      max-width: 768px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 18px 0;
      text-align: left;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      transition: color var(--transition);
    }

    .faq-question:hover {
      color: var(--cyan);
    }

    .faq-question .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      color: var(--text-mut);
      transition: all var(--transition);
      flex-shrink: 0;
    }

    .faq-item.open .faq-question {
      color: var(--cyan);
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      border-color: var(--cyan);
      color: var(--cyan);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 300ms ease-out;
    }

    .faq-answer-inner {
      padding: 4px 0 20px;
      color: var(--text-mut);
      font-size: 0.875rem;
      line-height: 1.75;
    }

    /* ===== CTA ===== */
    .cta-section {
      background: var(--bg-deep);
      position: relative;
      padding: 96px 0;
      border-top: 1px solid transparent;
      border-image: var(--neon-grad) 1;
      border-image-slice: 1;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      top: -20%;
      left: 30%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(168, 85, 247, 0.1), transparent 70%);
      pointer-events: none;
    }

    .cta-box {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 640px;
      margin: 0 auto;
    }

    .cta-box h2 {
      font-size: clamp(1.75rem, 3vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .cta-box p {
      color: var(--text-mut);
      font-size: 0.95rem;
      line-height: 1.75;
      margin-bottom: 32px;
    }

    .cta-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: var(--bg-deep);
      color: var(--text-mut);
    }

    .footer-line {
      height: 1px;
      background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 48px;
      padding: 64px 0 48px;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-desc {
      font-size: 0.85rem;
      line-height: 1.7;
      color: var(--text-mut);
      max-width: 320px;
    }

    .footer-col h3 {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      letter-spacing: 0.05em;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col li {
      margin-bottom: 10px;
    }

    .footer-col a {
      font-size: 0.85rem;
      color: var(--text-mut);
      transition: all var(--transition);
    }

    .footer-col a:hover {
      color: var(--cyan);
    }

    .footer-contact p {
      font-size: 0.85rem;
      margin-bottom: 8px;
      color: var(--text-mut);
    }

    .footer-bottom .container {
      padding-top: 24px;
      padding-bottom: 24px;
    }

    .footer-bottom p {
      font-size: 0.8rem;
      color: var(--text-dim);
      text-align: center;
    }

    .footer-bottom a {
      color: var(--text-dim);
      transition: color var(--transition);
    }

    .footer-bottom a:hover {
      color: var(--cyan);
    }

    /* ===== Responsive ===== */
    @media (max-width: 1023px) {
      .main-nav {
        display: none;
      }

      .nav-toggle {
        display: flex;
      }

      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }

      .feature-split {
        grid-template-columns: 1fr;
        gap: 32px;
      }

      .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }
    }

    @media (max-width: 767px) {
      .section {
        padding: 64px 0;
      }

      .card-grid {
        grid-template-columns: 1fr;
      }

      .card-grid.two {
        grid-template-columns: 1fr;
      }

      .step-list {
        grid-template-columns: 1fr;
        counter-reset: step;
      }

      .checklist {
        grid-template-columns: 1fr;
      }

      .footer-top {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 40px 0 32px;
      }

      .page-hero {
        padding-top: 120px;
        padding-bottom: 56px;
      }

      .page-hero h1 {
        font-size: 1.85rem;
      }

      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .hero-actions .btn-primary,
      .hero-actions .btn-outline {
        text-align: center;
      }
    }

    /* ===== Reduced Motion ===== */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }

/* roulang page: category2 */
:root {
            --bg-deep: #050507;
            --bg-default: #0a0a0f;
            --bg-card: #101018;
            --bg-panel: rgba(255, 255, 255, 0.03);
            --neon-cyan: #00e5ff;
            --neon-purple: #a855f7;
            --neon-pink: #ff2d78;
            --text-primary: #f4f4f5;
            --text-secondary: #a1a1aa;
            --text-muted: #52525b;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-neon: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-input: 10px;
            --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg-default);
            color: var(--text-primary);
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            font-size: 1rem;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease-out, border-color 0.2s ease-out, background-color 0.2s ease-out, box-shadow 0.2s ease-out, transform 0.2s ease-out;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: 80rem;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section-block {
            padding-top: 96px;
            padding-bottom: 96px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 72px;
            background: rgba(10, 10, 15, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .site-header::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
            pointer-events: none;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--neon-cyan);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
        }

        .brand-text {
            font-size: 1.125rem;
            font-weight: 700;
            letter-spacing: 0.01em;
            white-space: nowrap;
        }

        .main-nav ul {
            display: flex;
            gap: 32px;
            align-items: center;
        }

        .main-nav .nav-link {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            padding: 8px 0;
            position: relative;
            font-weight: 500;
        }

        .main-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 2px;
            border-radius: 2px;
            background: var(--neon-cyan);
            opacity: 0;
            transform: scaleX(0);
            transition: opacity 0.2s ease-out, transform 0.2s ease-out;
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.6);
        }

        .main-nav .nav-link:hover {
            color: var(--text-primary);
        }

        .main-nav .nav-link:hover::after {
            opacity: 0.6;
            transform: scaleX(0.6);
        }

        .main-nav .nav-link.active {
            color: var(--neon-cyan);
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
        }

        .main-nav .nav-link.active::after {
            opacity: 1;
            transform: scaleX(1);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--neon-cyan);
            color: #050507;
            font-weight: 700;
            border-radius: var(--radius-btn);
            padding: 12px 24px;
            font-size: 0.9375rem;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease-out;
        }

        .btn-primary:hover {
            background: #3df0ff;
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
            transform: translateY(-1px);
        }

        .btn-primary:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 3px;
        }

        .btn-sm {
            padding: 8px 18px;
            font-size: 0.875rem;
            border-radius: 10px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--text-primary);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-btn);
            padding: 12px 24px;
            font-size: 0.9375rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease-out;
        }

        .btn-outline:hover {
            border-color: var(--neon-cyan);
            color: var(--neon-cyan);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.15);
        }

        .btn-outline:focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 3px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.2s ease-out;
        }

        .hero-mini {
            position: relative;
            padding-top: 72px;
            min-height: 420px;
            display: flex;
            align-items: center;
            overflow: hidden;
            background-color: var(--bg-default);
        }

        .hero-mini-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
        }

        .hero-mini-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 10, 15, 0.6) 0%, rgba(10, 10, 15, 0.4) 50%, rgba(10, 10, 15, 0.85) 100%);
        }

        .hero-mini-glow {
            position: absolute;
            top: -100px;
            right: -100px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(168, 85, 247, 0.25), transparent 70%);
            pointer-events: none;
        }

        .hero-mini-content {
            position: relative;
            z-index: 2;
            padding-top: 48px;
            padding-bottom: 48px;
        }

        .hero-mini .badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 229, 255, 0.1);
            color: var(--neon-cyan);
            border: 1px solid rgba(0, 229, 255, 0.2);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 0.8125rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            margin-bottom: 20px;
        }

        .hero-mini h1 {
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
        }

        .hero-mini h1 .text-gradient {
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }

        .hero-mini .hero-desc {
            font-size: 1.125rem;
            color: var(--text-secondary);
            max-width: 580px;
            line-height: 1.75;
        }

        .section-title-wrap {
            margin-bottom: 48px;
        }

        .section-title-wrap .eyebrow {
            display: inline-block;
            font-size: 0.8125rem;
            color: var(--neon-cyan);
            letter-spacing: 0.1em;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .section-title-wrap h2 {
            font-size: clamp(1.75rem, 3vw, 2.5rem);
            font-weight: 700;
            line-height: 1.3;
            padding-left: 16px;
            border-left: 4px solid var(--neon-cyan);
        }

        .section-title-wrap .section-sub {
            color: var(--text-secondary);
            font-size: 0.9375rem;
            margin-top: 16px;
            max-width: 640px;
        }

        .tier-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-card);
            padding: 32px;
            position: relative;
            transition: all 0.2s ease-out;
        }

        .tier-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 229, 255, 0.4);
            box-shadow: 0 0 32px rgba(0, 229, 255, 0.12);
        }

        .tier-card.featured {
            border: 1px solid transparent;
            background: linear-gradient(var(--bg-card), var(--bg-card)) padding-box, linear-gradient(135deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6)) border-box;
            box-shadow: 0 0 40px rgba(168, 85, 247, 0.12);
            animation: tier-pulse 3s ease-in-out infinite;
        }

        .tier-card.featured:hover {
            transform: translateY(-4px);
            box-shadow: 0 0 40px rgba(0, 229, 255, 0.18);
        }

        @keyframes tier-pulse {
            0%,
            100% {
                box-shadow: 0 0 24px rgba(168, 85, 247, 0.15);
            }
            50% {
                box-shadow: 0 0 40px rgba(168, 85, 247, 0.3);
            }
        }

        .tier-recommend {
            display: inline-block;
            background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
            color: #050507;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 999px;
            letter-spacing: 0.04em;
            margin-bottom: 16px;
        }

        .tier-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .tier-price {
            font-family: var(--font-mono);
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .tier-price span {
            font-size: 0.875rem;
            color: var(--text-secondary);
            font-weight: 400;
        }

        .tier-desc {
            color: var(--text-secondary);
            font-size: 0.875rem;
            margin-bottom: 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            padding-bottom: 20px;
        }

        .tier-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .tier-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .tier-list li .dot {
            flex-shrink: 0;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--neon-cyan);
            margin-top: 8px;
            box-shadow: 0 0 6px rgba(0, 229, 255, 0.5);
        }

        .tier-list li .dot-purple {
            background: var(--neon-purple);
            box-shadow: 0 0 6px rgba(168, 85, 247, 0.5);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .feature-item {
            background: var(--bg-panel);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-card);
            padding: 28px;
            transition: all 0.2s ease-out;
            position: relative;
        }

        .feature-item:hover {
            background: var(--bg-card);
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.08);
        }

        .feature-item .feature-icon {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.15);
            margin-bottom: 16px;
        }

        .feature-item .feature-icon.purple {
            background: rgba(168, 85, 247, 0.08);
            border-color: rgba(168, 85, 247, 0.15);
        }

        .feature-item h3 {
            font-size: 1.0625rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .feature-item p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .scenario-card {
            background: var(--bg-card);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            transition: all 0.2s ease-out;
            position: relative;
            overflow: hidden;
        }

        .scenario-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 2px;
            height: 0;
            background: var(--neon-cyan);
            transition: height 0.3s ease-out;
        }

        .scenario-card:hover::before {
            height: 100%;
        }

        .scenario-card:hover {
            border-color: rgba(0, 229, 255, 0.25);
            transform: translateY(-3px);
        }

        .scenario-card .scenario-num {
            font-family: var(--font-mono);
            font-size: 2rem;
            font-weight: 700;
            color: rgba(0, 229, 255, 0.35);
            margin-bottom: 12px;
            line-height: 1;
        }

        .scenario-card h3 {
            font-size: 1.0625rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .scenario-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .process-wrap {
            max-width: 720px;
            margin: 0 auto;
        }

        .process-step {
            display: flex;
            gap: 20px;
            position: relative;
            padding-bottom: 32px;
        }

        .process-step:last-child {
            padding-bottom: 0;
        }

        .process-step::before {
            content: '';
            position: absolute;
            left: 19px;
            top: 44px;
            bottom: 4px;
            width: 1px;
            background: rgba(255, 255, 255, 0.1);
        }

        .process-step:last-child::before {
            display: none;
        }

        .process-num {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-mono);
            font-weight: 700;
            font-size: 0.875rem;
            background: rgba(0, 229, 255, 0.1);
            border: 1px solid rgba(0, 229, 255, 0.25);
            color: var(--neon-cyan);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.1);
        }

        .process-content {
            padding-top: 4px;
        }

        .process-content h3 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .process-content p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .faq-wrap {
            max-width: 768px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .faq-item:first-child {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            min-height: 56px;
            padding: 16px 0;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            color: var(--text-primary);
            font-weight: 500;
            text-align: left;
            font-family: inherit;
            transition: color 0.2s ease-out;
        }

        .faq-question:hover {
            color: var(--neon-cyan);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            position: relative;
            transition: transform 0.2s ease-out;
        }

        .faq-question .faq-icon::before,
        .faq-question .faq-icon::after {
            content: '';
            position: absolute;
            background: currentColor;
            border-radius: 2px;
            transition: transform 0.2s ease-out, opacity 0.2s ease-out;
        }

        .faq-question .faq-icon::before {
            width: 12px;
            height: 2px;
            top: 9px;
            left: 4px;
        }

        .faq-question .faq-icon::after {
            width: 2px;
            height: 12px;
            top: 4px;
            left: 9px;
        }

        .faq-item.open .faq-question {
            color: var(--neon-cyan);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }

        .faq-answer-inner {
            padding-bottom: 20px;
            color: var(--text-secondary);
            font-size: 0.9375rem;
            line-height: 1.75;
            padding-right: 32px;
        }

        .cta-section {
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
        }

        .cta-glow {
            position: absolute;
            bottom: -120px;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 300px;
            background: radial-gradient(ellipse, rgba(0, 229, 255, 0.15), transparent 70%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            font-size: clamp(1.75rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .cta-inner p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 32px;
        }

        .cta-form {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            text-align: left;
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-card);
            padding: 28px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-group label {
            font-size: 0.8125rem;
            color: var(--text-secondary);
        }

        .form-group input,
        .form-group select {
            background: #12121a;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-input);
            padding: 11px 14px;
            color: var(--text-primary);
            font-size: 0.875rem;
            font-family: inherit;
            outline: none;
            transition: all 0.2s ease-out;
            width: 100%;
        }

        .form-group input:focus,
        .form-group select:focus {
            border-color: var(--neon-cyan);
            box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.2);
        }

        .form-group input::placeholder {
            color: var(--text-muted);
        }

        .form-group select option {
            background: #12121a;
            color: var(--text-primary);
        }

        .cta-full {
            grid-column: 1 / -1;
        }

        .cta-form .btn-primary {
            width: 100%;
            padding: 14px 24px;
            font-size: 1rem;
        }

        .cta-note {
            text-align: center;
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-top: 16px;
            grid-column: 1 / -1;
        }

        .site-footer {
            background: var(--bg-deep);
            position: relative;
        }

        .footer-line {
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
        }

        .footer-top {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 48px;
            padding-top: 64px;
            padding-bottom: 48px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.125rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-col h3 {
            font-size: 0.9375rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul a {
            font-size: 0.875rem;
            color: var(--text-secondary);
            transition: color 0.2s ease-out;
        }

        .footer-col ul a:hover {
            color: var(--neon-cyan);
        }

        .footer-contact p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 20px;
            padding-bottom: 24px;
        }

        .footer-bottom p {
            font-size: 0.8125rem;
            color: var(--text-muted);
            text-align: center;
        }

        .footer-bottom a {
            color: var(--text-secondary);
            transition: color 0.2s ease-out;
        }

        .footer-bottom a:hover {
            color: var(--neon-cyan);
        }

        @media (max-width: 1024px) {
            .main-nav ul {
                gap: 20px;
            }
            .scenario-grid,
            .footer-top {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-block {
                padding-top: 64px;
                padding-bottom: 64px;
            }
            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: #0d0d14;
                border-bottom: 1px solid rgba(0, 229, 255, 0.2);
                padding: 20px 16px;
                display: none;
            }
            .main-nav.open {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 4px;
                align-items: stretch;
            }
            .main-nav .nav-link {
                display: block;
                padding: 12px 8px;
                border-radius: 8px;
            }
            .main-nav .nav-link:hover {
                background: rgba(255, 255, 255, 0.03);
            }
            .main-nav .nav-link.active {
                background: rgba(0, 229, 255, 0.05);
            }
            .main-nav .nav-link::after {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .header-actions {
                gap: 10px;
            }
            .header-actions .btn-sm {
                display: none;
            }
            .hero-mini {
                min-height: 360px;
            }
            .hero-mini .hero-desc {
                font-size: 1rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .footer-top {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-top: 48px;
            }
            .cta-form {
                grid-template-columns: 1fr;
                padding: 20px;
            }
            .cta-full {
                grid-column: auto;
            }
            .cta-note {
                grid-column: auto;
            }
        }

        @media (max-width: 520px) {
            .brand-text {
                font-size: 0.9375rem;
            }
            .hero-mini h1 {
                font-size: 1.75rem;
            }
            .hero-mini .badge {
                font-size: 0.75rem;
                padding: 5px 12px;
            }
            .tier-card {
                padding: 24px;
            }
            .feature-item,
            .scenario-card {
                padding: 20px;
            }
        }

/* roulang page: article */
:root {
            --bg-deep: #050507;
            --bg-main: #0a0a0f;
            --bg-card: #101018;
            --bg-panel: rgba(255, 255, 255, 0.03);
            --accent-cyan: #00e5ff;
            --accent-purple: #a855f7;
            --accent-pink: #ff2d78;
            --text-main: #f4f4f5;
            --text-secondary: #a1a1aa;
            --text-muted: #52525b;
            --border-color: rgba(255, 255, 255, 0.08);
            --gradient-neon: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 10px;
            --shadow-glow: 0 0 32px rgba(0, 229, 255, 0.12);
            --transition: 200ms ease-out;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-main);
            line-height: 1.75;
            font-size: 0.9375rem;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition), border-color var(--transition), box-shadow var(--transition);
        }

        button {
            font-family: inherit;
            border: none;
            background: none;
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        input,
        select,
        textarea {
            font-family: inherit;
        }

        .container {
            max-width: 80rem;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 72px;
            background: rgba(10, 10, 15, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            background: rgba(5, 5, 7, 0.95);
            box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
        }

        .site-header::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -1px;
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
            opacity: 0.5;
            pointer-events: none;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent-cyan);
            box-shadow: 0 0 12px var(--accent-cyan);
            flex-shrink: 0;
        }

        .brand-text {
            font-size: 1.125rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            white-space: nowrap;
            color: var(--text-main);
        }

        .main-nav ul {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .nav-link {
            position: relative;
            font-size: 0.9375rem;
            color: var(--text-secondary);
            padding: 8px 2px;
            transition: color var(--transition), text-shadow var(--transition);
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-main);
        }

        .nav-link.active {
            color: var(--accent-cyan);
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: var(--accent-cyan);
            box-shadow: 0 0 8px var(--accent-cyan);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            background: rgba(255, 255, 255, 0.02);
            transition: border-color var(--transition);
        }

        .nav-toggle:hover {
            border-color: rgba(0, 229, 255, 0.4);
        }

        .nav-toggle span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent-cyan);
            color: #0a0a0f;
            font-weight: 600;
            font-size: 0.9375rem;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            transition: all var(--transition);
            cursor: pointer;
            border: 1px solid transparent;
            line-height: 1.4;
        }

        .btn-primary:hover {
            background: #33eaff;
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
            transform: translateY(-1px);
            color: #0a0a0f;
        }

        .btn-primary:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 3px;
        }

        .btn-primary:active {
            transform: translateY(0px);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.3);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--text-main);
            font-weight: 500;
            font-size: 0.9375rem;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            line-height: 1.4;
        }

        .btn-secondary:hover {
            border-color: rgba(0, 229, 255, 0.5);
            color: var(--accent-cyan);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.1);
        }

        .btn-secondary:focus-visible {
            outline: 2px solid rgba(0, 229, 255, 0.5);
            outline-offset: 3px;
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 0.875rem;
        }

        /* ===== Badge ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 0.8125rem;
            font-weight: 500;
            background: rgba(0, 229, 255, 0.1);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }

        .badge-purple {
            background: rgba(168, 85, 247, 0.1);
            color: var(--accent-purple);
            border-color: rgba(168, 85, 247, 0.25);
        }

        .badge-pink {
            background: rgba(255, 45, 120, 0.1);
            color: var(--accent-pink);
            border-color: rgba(255, 45, 120, 0.25);
        }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            padding: 150px 0 48px;
            overflow: hidden;
            background: var(--bg-deep);
        }

        .article-banner-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.35;
        }

        .article-banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(5, 5, 7, 0.75) 0%, rgba(10, 10, 15, 0.9) 60%, rgba(10, 10, 15, 1) 100%);
        }

        .article-banner-content {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.8125rem;
            color: var(--text-secondary);
            margin-bottom: 22px;
        }

        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--accent-cyan);
        }

        .breadcrumb .sep {
            color: var(--text-muted);
        }

        .breadcrumb .current {
            color: var(--text-main);
            max-width: 280px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 48px 0 80px;
        }

        .article-container {
            max-width: 768px;
            margin: 0 auto;
        }

        .article-header {
            margin-bottom: 32px;
            padding-bottom: 28px;
            border-bottom: 1px solid var(--border-color);
        }

        .article-header h1 {
            font-size: clamp(1.75rem, 3.5vw, 2.5rem);
            line-height: 1.3;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            color: var(--text-main);
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            font-size: 0.8125rem;
            color: var(--text-secondary);
        }

        .article-meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta-sep {
            width: 1px;
            height: 14px;
            background: var(--border-color);
        }

        .article-meta-item svg {
            width: 16px;
            height: 16px;
            opacity: 0.6;
            flex-shrink: 0;
        }

        /* ===== Article Body ===== */
        .article-body {
            font-size: 1rem;
            line-height: 1.9;
            color: rgba(244, 244, 245, 0.92);
        }

        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--text-main);
            position: relative;
            padding-left: 16px;
            line-height: 1.4;
        }

        .article-body h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            bottom: 8px;
            width: 4px;
            border-radius: 2px;
            background: var(--accent-cyan);
            box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
        }

        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--text-main);
            line-height: 1.5;
        }

        .article-body p {
            margin-bottom: 20px;
        }

        .article-body ul,
        .article-body ol {
            margin: 16px 0 24px;
            padding-left: 24px;
        }

        .article-body ul {
            list-style: disc;
        }

        .article-body ol {
            list-style: decimal;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body blockquote {
            border-left: 3px solid var(--accent-purple);
            background: rgba(168, 85, 247, 0.08);
            padding: 16px 20px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
            color: var(--text-secondary);
            font-style: normal;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.9375rem;
            overflow: hidden;
            border-radius: 12px;
        }

        .article-body th,
        .article-body td {
            border: 1px solid var(--border-color);
            padding: 12px 16px;
            text-align: left;
        }

        .article-body th {
            background: var(--bg-card);
            font-weight: 600;
            color: var(--text-main);
        }

        .article-body tr:nth-child(even) td {
            background: var(--bg-panel);
        }

        .article-body img {
            border-radius: var(--radius-lg);
            margin: 24px 0;
            border: 1px solid var(--border-color);
        }

        .article-body a {
            color: var(--accent-cyan);
            border-bottom: 1px solid rgba(0, 229, 255, 0.3);
            transition: border-color var(--transition);
        }

        .article-body a:hover {
            border-bottom-color: var(--accent-cyan);
        }

        .article-body code {
            font-family: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 4px;
            padding: 2px 8px;
            font-size: 0.875em;
            color: var(--accent-cyan);
        }

        .article-body pre {
            background: var(--bg-deep);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            overflow-x: auto;
            margin: 24px 0;
        }

        .article-body pre code {
            background: none;
            padding: 0;
            color: var(--text-main);
        }

        .article-body hr {
            border: none;
            border-top: 1px solid var(--border-color);
            margin: 32px 0;
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 64px 0 64px;
            background: var(--bg-deep);
            border-top: 1px solid var(--border-color);
        }

        .related-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 24px;
            margin-bottom: 40px;
        }

        .related-header h2 {
            font-size: clamp(1.5rem, 2.5vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            position: relative;
            padding-left: 14px;
            color: var(--text-main);
        }

        .related-header h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            bottom: 6px;
            width: 4px;
            border-radius: 2px;
            background: var(--accent-cyan);
            box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
        }

        .related-more {
            font-size: 0.875rem;
            color: var(--text-secondary);
            transition: color var(--transition);
            white-space: nowrap;
        }

        .related-more:hover {
            color: var(--accent-cyan);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            display: block;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
        }

        .related-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 229, 255, 0.4);
            box-shadow: 0 0 32px rgba(0, 229, 255, 0.12);
        }

        .related-card-image {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
        }

        .related-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease-out;
        }

        .related-card:hover .related-card-image img {
            transform: scale(1.04);
        }

        .related-card-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(5, 5, 7, 0.6) 100%);
        }

        .related-badge {
            position: absolute;
            left: 14px;
            top: 14px;
            z-index: 2;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
            background: rgba(10, 10, 15, 0.8);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 229, 255, 0.3);
            backdrop-filter: blur(4px);
        }

        .related-card-body {
            padding: 20px 20px 24px;
        }

        .related-card-body h3 {
            font-size: 1.0625rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
            transition: color var(--transition);
        }

        .related-card:hover .related-card-body h3 {
            color: var(--accent-cyan);
        }

        .related-card-body p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            position: relative;
            padding: 80px 0 80px;
            background: var(--bg-deep);
            overflow: hidden;
            border-top: 1px solid var(--border-color);
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6));
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            max-width: 720px;
            margin: 0 auto;
            text-align: center;
        }

        .cta-inner h2 {
            font-size: clamp(1.5rem, 3vw, 2.25rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            color: var(--text-main);
        }

        .cta-inner p {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .cta-inner .btn-primary {
            min-width: 180px;
        }

        /* ===== Not Found ===== */
        .not-found {
            min-height: 70vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 140px 24px 80px;
        }

        .not-found h1 {
            font-size: clamp(1.75rem, 3vw, 2.25rem);
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .not-found p {
            color: var(--text-secondary);
            font-size: 1rem;
            margin-bottom: 32px;
        }

        .not-found .btn-primary {
            min-width: 160px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-color);
        }

        .footer-line {
            height: 1px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
            opacity: 0.5;
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding: 64px 0 48px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .footer-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h3 {
            font-size: 0.9375rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul a {
            font-size: 0.875rem;
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .footer-col ul a:hover {
            color: var(--accent-cyan);
        }

        .footer-contact p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 24px 0;
        }

        .footer-bottom .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }

        .footer-bottom p {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .footer-bottom a:hover {
            color: var(--accent-cyan);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-top {
                grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .main-nav {
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #0d0d14;
                border-bottom: 1px solid rgba(0, 229, 255, 0.2);
                display: none;
                padding: 16px 24px 24px;
                box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
            }

            .main-nav.open {
                display: block;
            }

            .main-nav ul {
                flex-direction: column;
                align-items: flex-start;
                gap: 4px;
            }

            .nav-link {
                display: block;
                padding: 10px 0;
                font-size: 1rem;
                width: 100%;
            }

            .nav-link.active::after {
                left: 0;
                right: auto;
                width: 32px;
                top: auto;
                bottom: 4px;
            }

            .nav-toggle {
                display: flex;
            }

            .header-actions .btn-primary {
                display: none;
            }

            .article-banner {
                padding: 130px 0 36px;
            }

            .breadcrumb .current {
                max-width: 200px;
            }

            .article-header h1 {
                font-size: 1.5rem;
                line-height: 1.35;
            }

            .article-meta {
                gap: 10px 16px;
            }

            .related-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                margin-bottom: 28px;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .related-card-body {
                padding: 16px 16px 20px;
            }

            .cta-section {
                padding: 56px 0 56px;
            }

            .footer-top {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
                padding: 48px 0 32px;
            }

            .footer-brand-col {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 520px) {
            .brand-text {
                font-size: 1rem;
            }

            .footer-top {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer-bottom .container {
                flex-direction: column;
                text-align: center;
            }

            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .article-meta-sep {
                display: none;
            }

            .related-header h2 {
                font-size: 1.375rem;
            }
        }

        /* ===== Reduced Motion ===== */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

/* roulang page: category3 */
:root {
      --bg-darker: #050507;
      --bg-default: #0a0a0f;
      --bg-card: #101018;
      --bg-panel: rgba(255, 255, 255, 0.03);
      --primary: #00e5ff;
      --secondary: #a855f7;
      --danger: #ff2d78;
      --text-main: #f4f4f5;
      --text-sub: #a1a1aa;
      --text-weak: #52525b;
      --border-color: rgba(255, 255, 255, 0.08);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --shadow-glow: 0 0 32px rgba(0, 229, 255, 0.12);
      --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--bg-default);
      color: var(--text-main);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      font-size: 0.9375rem;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease-out;
    }

    button,
    input,
    select {
      font-family: inherit;
    }

    .container {
      max-width: 80rem;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    .section {
      padding: 6rem 0;
    }

    .section + .section {
      border-top: 1px solid var(--border-color);
    }

    .section-chip {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      padding: 0.25rem 0.875rem;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.08);
      color: var(--primary);
      font-size: 0.8125rem;
      font-weight: 500;
      letter-spacing: 0.02em;
      margin-bottom: 1.25rem;
      border: 1px solid rgba(0, 229, 255, 0.15);
    }

    .section-title {
      font-size: clamp(1.75rem, 3vw, 2.5rem);
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.01em;
      margin-bottom: 1rem;
      position: relative;
      padding-left: 1rem;
    }

    .section-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0.25em;
      width: 4px;
      height: 0.75em;
      background: var(--primary);
      border-radius: 2px;
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.6);
    }

    .section-intro {
      color: var(--text-sub);
      font-size: 1rem;
      max-width: 42rem;
      margin-bottom: 2.5rem;
    }

    /* ===== Header ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      height: 72px;
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      box-shadow: 0 1px 0 rgba(0, 229, 255, 0.08), 0 1px 0 rgba(168, 85, 247, 0.08);
    }

    .site-header::after {
      content: '';
      display: block;
      height: 1px;
      background: linear-gradient(90deg, rgba(0, 229, 255, 0.5), rgba(168, 85, 247, 0.5));
      position: absolute;
      bottom: -1px;
      left: 0;
      right: 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 0.625rem;
      flex-shrink: 0;
    }

    .brand-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.9);
      display: inline-block;
    }

    .brand-text {
      font-weight: 700;
      font-size: 1.125rem;
      color: var(--text-main);
      letter-spacing: 0.01em;
      white-space: nowrap;
    }

    .main-nav ul {
      display: flex;
      list-style: none;
      gap: 2rem;
    }

    .main-nav .nav-link {
      position: relative;
      padding: 0.5rem 0.125rem;
      font-size: 0.9375rem;
      color: var(--text-sub);
      font-weight: 500;
      transition: color 0.2s ease-out;
      white-space: nowrap;
    }

    .main-nav .nav-link:hover {
      color: var(--text-main);
    }

    .main-nav .nav-link.active {
      color: var(--primary);
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.8);
    }

    .main-nav .nav-link.active::after {
      content: '';
      position: absolute;
      left: 12%;
      right: 12%;
      bottom: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px rgba(0, 229, 255, 0.7);
      border-radius: 2px;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary);
      color: #0a0a0f;
      font-weight: 600;
      border-radius: 10px;
      padding: 0.625rem 1.25rem;
      font-size: 0.9375rem;
      border: none;
      cursor: pointer;
      transition: all 0.2s ease-out;
      line-height: 1.4;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: #33eaff;
      box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
      transform: translateY(-1px);
    }

    .btn-primary:focus-visible {
      outline: 2px solid #fff;
      outline-offset: 2px;
    }

    .btn-primary.btn-sm {
      padding: 0.425rem 0.875rem;
      font-size: 0.875rem;
    }

    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      color: var(--primary);
      border: 1px solid rgba(0, 229, 255, 0.35);
      border-radius: 10px;
      padding: 0.625rem 1.25rem;
      font-size: 0.9375rem;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s ease-out;
      white-space: nowrap;
    }

    .btn-ghost:hover {
      border-color: var(--primary);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
      background: rgba(0, 229, 255, 0.05);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      width: 40px;
      height: 40px;
      border-radius: 8px;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 5px;
    }

    .nav-toggle span {
      display: block;
      width: 20px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: transform 0.3s, opacity 0.3s;
    }

    .nav-toggle.open span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.open span:nth-child(2) {
      opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* ===== Hero ===== */
    .hero-section {
      position: relative;
      padding: 10rem 0 5.5rem;
      background: var(--bg-default);
      overflow: hidden;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-3.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.16;
    }

    .hero-bg::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10, 10, 15, 0.8) 0%, rgba(10, 10, 15, 0.4) 50%, rgba(10, 10, 15, 1) 100%);
    }

    .hero-glow {
      position: absolute;
      top: -10%;
      right: -5%;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(168, 85, 247, 0.18) 0%, transparent 70%);
      pointer-events: none;
    }

    .hero-glow-2 {
      position: absolute;
      bottom: -20%;
      left: -10%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.12) 0%, transparent 70%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 52rem;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.375rem 1rem;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid rgba(0, 229, 255, 0.2);
      color: var(--primary);
      font-size: 0.8125rem;
      font-weight: 500;
      margin-bottom: 1.5rem;
      animation: fadeUp 0.5s ease-out both;
    }

    .hero-badge .dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 8px rgba(0, 229, 255, 0.8);
      animation: pulse 2.5s ease-in-out infinite;
    }

    .hero-title {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
      color: var(--text-main);
      animation: fadeUp 0.6s ease-out 0.06s both;
    }

    .hero-title .accent {
      background: linear-gradient(120deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-sub);
      max-width: 40rem;
      margin-bottom: 2rem;
      animation: fadeUp 0.6s ease-out 0.12s both;
    }

    .hero-cta {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      animation: fadeUp 0.6s ease-out 0.18s both;
    }

    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(16px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes pulse {
      0%, 100% {
        opacity: 1;
        transform: scale(1);
      }
      50% {
        opacity: 0.6;
        transform: scale(0.8);
      }
    }

    @keyframes breatheGlow {
      0%, 100% {
        box-shadow: 0 0 20px rgba(0, 229, 255, 0.12);
      }
      50% {
        box-shadow: 0 0 32px rgba(0, 229, 255, 0.3);
      }
    }

    /* ===== Cards ===== */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 1.75rem;
      transition: transform 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 255, 0.3);
      box-shadow: var(--shadow-glow);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid rgba(0, 229, 255, 0.15);
      margin-bottom: 1.25rem;
      color: var(--primary);
    }

    .card-icon.purple {
      background: rgba(168, 85, 247, 0.1);
      border-color: rgba(168, 85, 247, 0.2);
      color: var(--secondary);
    }

    .card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.625rem;
    }

    .card p {
      color: var(--text-sub);
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    /* ===== Category Cards ===== */
    .category-card {
      position: relative;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: transform 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
      height: 100%;
    }

    .category-card:hover {
      transform: translateY(-4px);
      border-color: rgba(168, 85, 247, 0.4);
      box-shadow: 0 0 32px rgba(168, 85, 247, 0.15);
    }

    .category-card .card-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .category-card .card-img-wrap {
      position: relative;
      overflow: hidden;
    }

    .category-card .card-img-wrap::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 40%, rgba(10, 10, 15, 0.6) 100%);
    }

    .category-card .card-body {
      padding: 1.5rem;
    }

    .category-tag {
      display: inline-block;
      font-size: 0.75rem;
      padding: 0.1875rem 0.625rem;
      border-radius: 999px;
      background: rgba(0, 229, 255, 0.08);
      color: var(--primary);
      border: 1px solid rgba(0, 229, 255, 0.15);
      margin-bottom: 0.75rem;
      font-weight: 500;
    }

    /* ===== Steps ===== */
    .step-card {
      position: relative;
      padding: 1.75rem;
      background: var(--bg-panel);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      height: 100%;
      transition: border-color 0.2s ease-out, background 0.2s ease-out;
    }

    .step-card:hover {
      background: rgba(255, 255, 255, 0.04);
      border-color: rgba(0, 229, 255, 0.2);
    }

    .step-num {
      font-family: var(--font-mono);
      font-size: 2.75rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 1rem;
      display: block;
      opacity: 0.9;
    }

    .step-card h3 {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }

    .step-card p {
      color: var(--text-sub);
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    /* ===== Announcement Cards ===== */
    .announcement-card {
      display: flex;
      flex-direction: column;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: transform 0.2s ease-out, border-color 0.2s ease-out, box-shadow 0.2s ease-out;
      height: 100%;
    }

    .announcement-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 255, 0.3);
      box-shadow: var(--shadow-glow);
    }

    .announcement-card .card-img {
      width: 100%;
      height: 170px;
      object-fit: cover;
      position: relative;
    }

    .announcement-card .card-content {
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .announcement-meta {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 0.8125rem;
      color: var(--text-weak);
      margin-bottom: 0.75rem;
    }

    .announcement-meta .badge {
      display: inline-block;
      padding: 0.125rem 0.5rem;
      border-radius: 999px;
      font-size: 0.75rem;
      background: rgba(0, 229, 255, 0.08);
      color: var(--primary);
      border: 1px solid rgba(0, 229, 255, 0.12);
      font-weight: 500;
    }

    .announcement-card h3 {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.5rem;
      line-height: 1.5;
      transition: color 0.2s ease-out;
    }

    .announcement-card:hover h3 {
      color: var(--primary);
    }

    .announcement-card p {
      color: var(--text-sub);
      font-size: 0.9375rem;
      line-height: 1.7;
      margin-bottom: 1rem;
    }

    .announcement-link {
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 500;
      transition: gap 0.2s ease-out;
    }

    .announcement-link:hover {
      gap: 0.625rem;
    }

    /* ===== Notice Timeline ===== */
    .timeline {
      position: relative;
      padding-left: 1.75rem;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 0.375rem;
      top: 0.25rem;
      bottom: 0.25rem;
      width: 1px;
      background: linear-gradient(180deg, var(--primary), var(--secondary), transparent);
      opacity: 0.5;
    }

    .timeline-item {
      position: relative;
      padding: 1.25rem 0;
      padding-left: 1.5rem;
    }

    .timeline-item::before {
      content: '';
      position: absolute;
      left: -1.375rem;
      top: 1.9rem;
      width: 0.75rem;
      height: 0.75rem;
      border-radius: 50%;
      background: var(--bg-default);
      border: 2px solid var(--primary);
      box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
    }

    .timeline-item .timeline-time {
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      color: var(--primary);
      margin-bottom: 0.25rem;
    }

    .timeline-item h4 {
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.375rem;
    }

    .timeline-item p {
      color: var(--text-sub);
      font-size: 0.9375rem;
      line-height: 1.7;
    }

    /* ===== FAQ ===== */
    .faq-section {
      max-width: 48rem;
      margin: 0 auto;
    }

    .faq-list {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 1.25rem 0;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
      font-size: 1.0625rem;
      font-weight: 600;
      transition: color 0.2s ease-out;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-item.active .faq-question {
      color: var(--primary);
    }

    .faq-icon {
      flex-shrink: 0;
      width: 20px;
      height: 20px;
      position: relative;
      transition: transform 0.3s ease-out;
    }

    .faq-icon::before,
    .faq-icon::after {
      content: '';
      position: absolute;
      background: var(--text-sub);
      border-radius: 2px;
      transition: background 0.2s;
    }

    .faq-icon::before {
      width: 14px;
      height: 2px;
      top: 9px;
      left: 3px;
    }

    .faq-icon::after {
      width: 2px;
      height: 14px;
      left: 9px;
      top: 3px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 1.25rem;
    }

    .faq-answer p {
      color: var(--text-sub);
      font-size: 0.9375rem;
      line-height: 1.8;
      padding-right: 2rem;
    }

    /* ===== CTA ===== */
    .cta-section {
      position: relative;
      padding: 5.5rem 0;
      background: var(--bg-darker);
      overflow: hidden;
      text-align: center;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.6), rgba(168, 85, 247, 0.6), transparent);
    }

    .cta-glow {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 600px;
      height: 400px;
      background: radial-gradient(ellipse, rgba(0, 229, 255, 0.08), rgba(168, 85, 247, 0.06), transparent);
      pointer-events: none;
    }

    .cta-section .container {
      position: relative;
      z-index: 2;
    }

    .cta-title {
      font-size: clamp(1.75rem, 3.5vw, 2.75rem);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.25rem;
      letter-spacing: -0.01em;
    }

    .cta-subtitle {
      color: var(--text-sub);
      font-size: 1.0625rem;
      max-width: 36rem;
      margin: 0 auto 2.5rem;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: var(--bg-darker);
      color: var(--text-sub);
    }

    .footer-line {
      height: 1px;
      background: linear-gradient(90deg, rgba(0, 229, 255, 0.4), rgba(168, 85, 247, 0.4));
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      padding: 4rem 0 3rem;
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 0.625rem;
      font-weight: 700;
      font-size: 1.125rem;
      color: var(--text-main);
      margin-bottom: 1rem;
    }

    .footer-desc {
      font-size: 0.9375rem;
      line-height: 1.8;
      max-width: 24rem;
      color: var(--text-sub);
    }

    .footer-col h3 {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 1.25rem;
      letter-spacing: 0.03em;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 0.625rem;
    }

    .footer-col ul li a {
      color: var(--text-sub);
      font-size: 0.9375rem;
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

    .footer-contact p {
      font-size: 0.9375rem;
      margin-bottom: 0.5rem;
      color: var(--text-sub);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding: 1.5rem 0;
    }

    .footer-bottom .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .footer-bottom p {
      font-size: 0.875rem;
      color: var(--text-weak);
    }

    .footer-bottom a {
      color: var(--text-weak);
      transition: color 0.2s;
    }

    .footer-bottom a:hover {
      color: var(--primary);
    }

    /* ===== Mobile Menu ===== */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      background: #0d0d14;
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      padding: 1rem 1.5rem 1.5rem;
      z-index: 99;
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
    }

    .mobile-menu.open {
      display: block;
    }

    .mobile-menu ul {
      list-style: none;
    }

    .mobile-menu ul li + li {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .mobile-menu ul li a {
      display: block;
      padding: 0.875rem 0;
      color: var(--text-sub);
      font-size: 1rem;
      font-weight: 500;
      transition: color 0.2s;
    }

    .mobile-menu ul li a:hover,
    .mobile-menu ul li a.active {
      color: var(--primary);
    }

    .mobile-menu .btn-primary {
      margin-top: 1rem;
      width: 100%;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1023px) {
      .main-nav {
        display: none;
      }

      .nav-toggle {
        display: flex;
      }

      .header-actions .btn-primary {
        display: none;
      }

      .section {
        padding: 4rem 0;
      }

      .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
      }
    }

    @media (max-width: 767px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }

      .hero-section {
        padding: 7.5rem 0 3.5rem;
      }

      .footer-top {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 3rem 0 2rem;
      }

      .footer-bottom .container {
        flex-direction: column;
        text-align: center;
      }

      .announcement-card .card-img {
        height: 150px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation: none !important;
        transition: none !important;
      }

      html {
        scroll-behavior: auto;
      }
    }