/* roulang page: index */
:root {
  --bg-primary: #070c16;
  --bg-secondary: #0c1424;
  --bg-surface: #111b2e;
  --bg-surface-2: #172238;
  --bg-card: #131e33;
  --bg-card-hover: #182540;
  --neon: #00e5ff;
  --neon-dim: rgba(0, 229, 255, 0.28);
  --neon-2: #ff2d78;
  --neon-2-dim: rgba(255, 45, 120, 0.25);
  --text-primary: #ecf1f9;
  --text-secondary: #a5b2c9;
  --text-muted: #64738d;
  --border: #1d2b45;
  --border-light: #263756;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  --shadow-neon: 0 0 32px rgba(0, 229, 255, 0.10);
  --spacing: 88px;
  --spacing-md: 56px;
  --spacing-sm: 32px;
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: 0.24s cubic-bezier(0.4, 0, 0.2, 1);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; border: none; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 12, 22, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}
.site-header::after {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--neon-2), transparent);
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  opacity: 0.65;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 70px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}
.logo-neon {
  color: var(--neon);
  text-shadow: 0 0 16px var(--neon-dim);
  font-weight: 900;
}
.logo-sub {
  color: var(--text-primary);
  font-weight: 600;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}
.nav-link.active {
  color: #031018;
  background: var(--neon);
  box-shadow: 0 0 20px var(--neon-dim), 0 0 6px rgba(0, 229, 255, 0.5);
  font-weight: 700;
}
.nav-cta {
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 20px;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.nav-toggle:hover {
  border-color: var(--neon);
  box-shadow: 0 0 16px var(--neon-dim);
}
.nav-toggle:focus {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

/* ===== Buttons ===== */
.btn-primary, .btn-outline, .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  transition: all var(--transition);
  white-space: nowrap;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--neon);
  color: #06121a;
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(0, 229, 255, 0.4);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-primary:focus-visible {
  outline: 3px solid rgba(0, 229, 255, 0.45);
  outline-offset: 3px;
}
.btn-outline {
  background: transparent;
  border-color: var(--border-light);
  color: var(--text-primary);
}
.btn-outline:hover {
  border-color: var(--neon);
  box-shadow: 0 0 20px var(--neon-dim);
  transform: translateY(-2px);
}
.btn-outline:active { transform: translateY(0); }
.btn-outline:focus-visible {
  outline: 3px solid rgba(0, 229, 255, 0.35);
  outline-offset: 3px;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  background: url('/assets/images/backpic/back-1.png') no-repeat center center / cover;
  isolation: isolate;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(5, 10, 20, 0.94) 0%, rgba(5, 10, 20, 0.72) 50%, rgba(5, 10, 20, 0.4) 100%);
  z-index: -1;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent, var(--bg-primary));
  z-index: 0;
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 70px;
  padding-bottom: 100px;
}
.hero-content {
  max-width: 720px;
}
.hero-tag {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.35);
  color: var(--neon);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 22px;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
}
.hero-title {
  font-size: clamp(36px, 5.2vw, 58px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.hero-title .highlight {
  color: var(--neon);
  text-shadow: 0 0 30px rgba(0, 229, 255, 0.4);
}
.hero-desc {
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 34px;
}
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 50px;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 28px;
}
.hero-stat {
  display: flex;
  flex-direction: column;
}
.hero-stat-number {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
}
.hero-stat-number span {
  color: var(--neon);
}
.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 0.5px;
}

/* ===== Section 通用 ===== */
.section {
  padding: var(--spacing) 0;
}
.section-alt {
  background: var(--bg-secondary);
}
.section-header {
  max-width: 700px;
  margin-bottom: 46px;
}
.section-header.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--neon);
  margin-bottom: 12px;
  border: 1px solid rgba(0, 229, 255, 0.3);
  background: rgba(0, 229, 255, 0.06);
  padding: 4px 14px;
  border-radius: 999px;
}
.section-title {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}
.section-desc {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ===== 分类卡片 ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.category-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-light);
  box-shadow: var(--shadow), var(--shadow-neon);
  background: var(--bg-card-hover);
}
.category-card:hover::before {
  opacity: 1;
}
.category-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(255, 45, 120, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  border: 1px solid rgba(0, 229, 255, 0.2);
}
.category-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}
.category-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}
.category-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--neon);
  transition: gap var(--transition);
}
.category-link:hover {
  gap: 10px;
}
.category-link::after {
  content: '→';
  font-size: 15px;
}

/* ===== 资讯列表 ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}
.post-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  box-shadow: var(--shadow);
}
.post-cat {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--neon);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 16px;
  align-self: flex-start;
}
.post-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
  transition: color var(--transition);
}
.post-title a:hover {
  color: var(--neon);
}
.post-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.post-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.empty-tip {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  background: var(--bg-card);
  border: 1px dashed var(--border-light);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 15px;
}

/* ===== Steps 流程 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  counter-reset: step;
}
.step-item {
  padding: 32px 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
  transition: all var(--transition);
}
.step-item:hover {
  border-color: var(--neon-dim);
  box-shadow: var(--shadow-neon);
  transform: translateY(-4px);
}
.step-num {
  font-size: 42px;
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 2px var(--neon);
  line-height: 1;
  margin-bottom: 18px;
}
.step-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-item p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== Featured 推荐 ===== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.featured-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all var(--transition);
  aspect-ratio: 3 / 4;
  display: block;
}
.featured-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow), var(--shadow-neon);
  border-color: var(--border-light);
}
.featured-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.featured-card:hover img {
  transform: scale(1.05);
}
.featured-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  background: linear-gradient(180deg, rgba(5, 10, 20, 0) 40%, rgba(5, 10, 20, 0.88) 100%);
}
.featured-tag {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  background: var(--neon);
  color: #06121a;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.featured-title {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item:hover {
  border-color: var(--border-light);
}
.faq-item details {
  width: 100%;
}
.faq-item summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color var(--transition);
  position: relative;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  font-size: 24px;
  font-weight: 400;
  color: var(--neon);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item details[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}
.faq-item details[open] summary {
  border-bottom: 1px solid var(--border);
}
.faq-answer {
  padding: 18px 24px 22px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.75;
}

/* ===== CTA ===== */
.cta-section {
  padding: 70px 0;
}
.cta-box {
  background: url('/assets/images/backpic/back-2.png') no-repeat center center / cover;
  border-radius: var(--radius-lg);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
}
.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(7, 12, 22, 0.94), rgba(7, 12, 22, 0.72));
  z-index: 1;
}
.cta-box > * {
  position: relative;
  z-index: 2;
}
.cta-title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  margin-bottom: 14px;
}
.cta-desc {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 640px;
  margin: 0 auto 30px;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 56px 0 0;
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0.3;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.footer-brand .logo {
  font-size: 22px;
  margin-bottom: 12px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 260px;
  line-height: 1.7;
}
.footer-links h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition), padding-left var(--transition);
}
.footer-links a:hover {
  color: var(--neon);
  padding-left: 4px;
}
.footer-contact {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.footer-contact .contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.footer-contact .contact-item i {
  color: var(--neon);
  width: 18px;
  text-align: center;
}
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-secondary);
}
.footer-bottom a:hover {
  color: var(--neon);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root {
    --spacing: 64px;
  }
  .category-grid,
  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}
@media (max-width: 768px) {
  :root {
    --spacing: 48px;
    --spacing-md: 36px;
  }
  .header-inner {
    height: 62px;
  }
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(7, 12, 22, 0.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition);
    z-index: 100;
  }
  .main-nav.nav-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
  .nav-cta {
    display: none;
  }
  .hero {
    min-height: 520px;
  }
  .hero .container {
    padding-top: 50px;
    padding-bottom: 70px;
  }
  .hero-title {
    font-size: 34px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-stat-number {
    font-size: 26px;
  }
  .post-grid {
    grid-template-columns: 1fr;
  }
  .cta-box {
    padding: 44px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}
@media (max-width: 520px) {
  .container {
    padding: 0 20px;
  }
  .category-grid,
  .featured-grid,
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-buttons .btn-primary,
  .hero-buttons .btn-outline {
    width: 100%;
  }
  .hero-stats {
    flex-direction: column;
    gap: 18px;
  }
  .section {
    padding: 40px 0;
  }
  .section-header {
    margin-bottom: 28px;
  }
  .step-item {
    padding: 24px 20px;
  }
  .faq-item summary {
    padding: 16px 18px;
    font-size: 15px;
  }
  .faq-answer {
    padding: 14px 18px 18px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== 通用小工具 ===== */
.text-neon { color: var(--neon); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }

/* roulang page: article */
/* ===== 设计变量 ===== */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1420;
  --bg-card: #121927;
  --bg-hover: #1a2334;
  --border: #1e2a3d;
  --text-main: #e8edf2;
  --text-sub: #9aa8bd;
  --text-muted: #5f6f84;
  --neon: #00d4ff;
  --neon-dark: #0098cc;
  --pink: #ff2d75;
  --green: #00e88f;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-card: 0 10px 40px rgba(0, 0, 0, .45);
  --shadow-neon: 0 0 28px rgba(0, 212, 255, .25);
  --shadow-pink: 0 0 20px rgba(255, 45, 117, .2);
  --transition: all .3s ease;
}

/* ===== Reset / Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--neon); text-decoration: none; transition: var(--transition); }
a:hover { color: #66e6ff; }
ul, ol { list-style-position: inside; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; color: inherit; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, .88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(0, 212, 255, .18);
  box-shadow: 0 4px 30px rgba(0, 0, 0, .5);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  height: 72px;
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-shrink: 0;
}
.logo-neon {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 1px;
  color: #fff;
  text-shadow: 0 0 12px rgba(0, 212, 255, .6), 0 0 40px rgba(0, 212, 255, .3);
}
.logo-sub {
  font-size: 13px;
  font-weight: 600;
  color: var(--neon);
  letter-spacing: 2px;
  border: 1px solid rgba(0, 212, 255, .35);
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(0, 212, 255, .06);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 20px;
  transition: var(--transition);
  position: relative;
  white-space: nowrap;
}
.nav-link:hover {
  color: #fff;
  background: rgba(0, 212, 255, .08);
}
.nav-link.active {
  color: var(--neon);
  background: rgba(0, 212, 255, .1);
  box-shadow: inset 0 0 0 1px rgba(0, 212, 255, .25);
  text-shadow: 0 0 8px rgba(0, 212, 255, .5);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 3px;
  border-radius: 3px;
  background: var(--neon);
  box-shadow: 0 0 10px var(--neon);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neon), #00a6e0);
  color: #0a0e17;
  font-weight: 700;
  font-size: 15px;
  padding: 10px 22px;
  border-radius: 40px;
  letter-spacing: .5px;
  transition: var(--transition);
  border: none;
  box-shadow: 0 4px 20px rgba(0, 212, 255, .3);
  white-space: nowrap;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, .45);
  color: #0a0e17;
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:focus-visible, .nav-link:focus-visible, .nav-toggle:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}
.nav-toggle {
  display: none;
  font-size: 24px;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  color: var(--neon);
  border: 1px solid rgba(0, 212, 255, .3);
  background: rgba(0, 212, 255, .05);
}
.nav-cta { margin-left: 4px; }

/* ===== 文章 Hero ===== */
.article-hero {
  position: relative;
  padding: 80px 0 70px;
  background: linear-gradient(180deg, rgba(10, 14, 23, 0.6), var(--bg-primary) 92%),
              url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid rgba(0, 212, 255, .12);
  overflow: hidden;
}
.article-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 212, 255, .18), transparent 65%);
  border-radius: 50%;
  pointer-events: none;
}
.article-hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: 20%;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(255, 45, 117, .1), transparent 65%);
  border-radius: 50%;
  pointer-events: none;
}
.article-hero .container { position: relative; z-index: 2; }
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--neon); }
.breadcrumb .sep { color: var(--text-muted); opacity: .6; }
.hero-badge {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--neon);
  background: rgba(0, 212, 255, .1);
  border: 1px solid rgba(0, 212, 255, .3);
  box-shadow: 0 0 16px rgba(0, 212, 255, .15);
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.article-hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  max-width: 860px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, .6);
}
.article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
  color: var(--text-sub);
}
.article-hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ===== 文章主体 ===== */
.article-main {
  padding: 60px 0 80px;
}
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}
.article-primary { min-width: 0; }
.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 36px 40px;
  margin-bottom: 30px;
}
.article-content {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-main);
}
.article-content p { margin-bottom: 18px; }
.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 32px 0 16px;
  padding-left: 16px;
  border-left: 4px solid var(--neon);
  color: #fff;
}
.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 26px 0 14px;
  color: #fff;
}
.article-content ul, .article-content ol { margin-bottom: 18px; padding-left: 24px; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote {
  border-left: 4px solid var(--pink);
  background: rgba(255, 45, 117, .06);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 20px 0;
  color: var(--text-sub);
}
.article-content img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .5);
}
.article-content a { color: var(--neon); border-bottom: 1px solid rgba(0, 212, 255, .3); }
.article-content a:hover { color: #66e6ff; border-color: #66e6ff; }
.article-content code {
  background: rgba(0, 212, 255, .08);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: .9em;
  color: var(--neon);
}
.not-found-box {
  text-align: center;
  padding: 60px 20px;
}
.not-found-icon {
  font-size: 56px;
  display: block;
  margin-bottom: 18px;
  filter: grayscale(.4) brightness(.8);
}
.not-found-box h2 {
  font-size: 28px;
  margin-bottom: 12px;
  color: #fff;
}
.not-found-box p { color: var(--text-sub); margin-bottom: 26px; }

/* ===== 文章页脚信息 ===== */
.article-footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  margin-top: 28px;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 16px;
  font-size: 13px;
  color: var(--text-sub);
  background: rgba(0, 212, 255, .05);
  border: 1px solid rgba(0, 212, 255, .18);
  transition: var(--transition);
}
.tag:hover { color: var(--neon); border-color: var(--neon); }
.article-share {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}
.share-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  font-size: 15px;
  color: var(--text-sub);
  transition: var(--transition);
}
.share-btn:hover {
  color: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 0 12px rgba(0, 212, 255, .25);
  transform: translateY(-2px);
}

/* ===== 上下篇导航 ===== */
.article-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 30px;
}
.pager-link {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: var(--transition);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.pager-link:hover {
  border-color: rgba(0, 212, 255, .4);
  box-shadow: 0 6px 24px rgba(0, 212, 255, .1);
  transform: translateY(-3px);
  color: #fff;
}
.pager-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.pager-title {
  font-size: 16px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 90%;
}
.pager-next { text-align: right; align-items: flex-end; }

/* ===== 侧边栏 ===== */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 96px;
}
.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .3);
}
.sidebar-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-card h3 .icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: rgba(0, 212, 255, .12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--neon);
}
.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-sub);
  font-size: 14px;
  transition: var(--transition);
}
.sidebar-links a:hover {
  background: rgba(0, 212, 255, .07);
  color: var(--neon);
  padding-left: 16px;
}
.sidebar-links a .num {
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, .04);
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}
.sidebar-cta {
  background: linear-gradient(135deg, rgba(0, 212, 255, .1), rgba(255, 45, 117, .07));
  border: 1px solid rgba(0, 212, 255, .25);
}
.sidebar-cta p {
  color: var(--text-sub);
  font-size: 14px;
  margin-bottom: 16px;
  line-height: 1.6;
}
.sidebar-cta .btn-primary { width: 100%; }

/* ===== 相关推荐 ===== */
.related-section {
  background: var(--bg-secondary);
  padding: 70px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head {
  text-align: center;
  margin-bottom: 40px;
}
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--neon);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-head h2 {
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
  display: block;
  color: var(--text-main);
}
.related-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 212, 255, .15);
  border-color: rgba(0, 212, 255, .4);
  color: #fff;
}
.related-card-img {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.related-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.related-card:hover .related-card-img img { transform: scale(1.06); }
.related-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(10, 14, 23, .7));
}
.related-card-body {
  padding: 22px 24px 26px;
}
.related-card-body .tag { margin-bottom: 10px; }
.related-card-body h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 10px 0 8px;
  line-height: 1.45;
}
.related-card-body p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== FAQ ===== */
.faq-section {
  padding: 70px 0;
}
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item[open] {
  border-color: rgba(0, 212, 255, .3);
  box-shadow: 0 8px 28px rgba(0, 212, 255, .08);
}
.faq-item summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
  flex-shrink: 0;
}
.faq-item summary::after {
  content: '+';
  margin-left: auto;
  font-size: 22px;
  color: var(--text-muted);
  font-weight: 300;
  transition: transform .3s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); color: var(--neon); }
.faq-item[open] summary { color: var(--neon); }
.faq-answer {
  padding: 0 24px 20px 44px;
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.8;
}

/* ===== CTA ===== */
.cta-section {
  padding: 30px 0 80px;
}
.cta-box {
  position: relative;
  background: linear-gradient(135deg, rgba(0, 212, 255, .12), rgba(255, 45, 117, .08));
  border: 1px solid rgba(0, 212, 255, .3);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  overflow: hidden;
}
.cta-box::before {
  content: '';
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 160px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, .2), transparent 70%);
  pointer-events: none;
}
.cta-box h2 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
}
.cta-box p {
  color: var(--text-sub);
  font-size: 16px;
  margin-bottom: 28px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}
.cta-box .btn-primary {
  font-size: 16px;
  padding: 14px 36px;
  position: relative;
}

/* ===== Footer ===== */
.site-footer {
  background: #0a0e17;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.7;
  max-width: 340px;
}
.footer-links h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}
.footer-links h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
}
.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links a {
  color: var(--text-sub);
  font-size: 14px;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--neon);
  padding-left: 4px;
}
.footer-contact h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}
.footer-contact h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--pink);
  box-shadow: 0 0 8px var(--pink);
}
.contact-item {
  color: var(--text-sub);
  font-size: 14px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.contact-item a { color: var(--text-sub); }
.contact-item a:hover { color: var(--neon); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--neon); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
  }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .header-inner { height: auto; padding: 12px 20px; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 0;
    right: -320px;
    width: 300px;
    height: 100vh;
    background: rgba(12, 17, 26, .98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 24px 30px;
    gap: 8px;
    transition: right .35s ease;
    box-shadow: -10px 0 40px rgba(0, 0, 0, .5);
    z-index: 999;
    border-left: 1px solid rgba(0, 212, 255, .15);
  }
  .main-nav.open { right: 0; }
  .nav-link { width: 100%; padding: 14px 16px; font-size: 16px; }
  .nav-link.active::after { display: none; }
  .nav-cta { display: none; }
  .header-inner.open .nav-toggle {
    position: fixed;
    right: 20px;
    top: 18px;
    z-index: 1001;
    background: rgba(10, 14, 23, .95);
  }
  .nav-mask {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .5);
    z-index: 998;
    display: none;
  }
  .nav-mask.show { display: block; }
  .article-hero h1 { font-size: 28px; }
}
@media (max-width: 768px) {
  .article-card { padding: 24px; }
  .article-content h2 { font-size: 21px; }
  .article-content h3 { font-size: 18px; }
  .article-pager { grid-template-columns: 1fr; }
  .article-sidebar { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .cta-box { padding: 40px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .site-header .container { padding: 0 16px; }
  .logo-neon { font-size: 22px; }
  .logo-sub { font-size: 11px; padding: 1px 6px; }
  .article-hero { padding: 50px 0 45px; }
  .article-hero h1 { font-size: 24px; }
  .article-hero-meta { gap: 10px; flex-direction: column; }
  .article-card { padding: 20px 16px; border-radius: 16px; }
  .article-content { font-size: 15px; line-height: 1.8; }
  .article-content h2 { font-size: 19px; padding-left: 12px; }
  .article-content h3 { font-size: 17px; }
  .section-head h2 { font-size: 24px; }
  .related-card-body h3 { font-size: 16px; }
  .cta-box { padding: 32px 20px; }
  .cta-box h2 { font-size: 22px; }
  .faq-item summary { padding: 16px 18px; font-size: 15px; }
  .faq-answer { padding: 0 18px 16px 36px; }
}

/* roulang page: category1 */
:root {
  --bg-primary: #070b14;
  --bg-secondary: #0d1322;
  --bg-card: #101827;
  --bg-elevated: #1a2335;
  --brand-primary: #00e5ff;
  --brand-secondary: #8b5cf6;
  --brand-glow: rgba(0, 229, 255, 0.35);
  --text-primary: #e6edf6;
  --text-secondary: #8a9bb3;
  --text-muted: #5f6f8a;
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(0, 229, 255, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 50px rgba(0, 0, 0, 0.55);
  --transition-base: all 0.3s ease;
  --container-width: 1200px;
  --space-section: 80px;
  --space-section-mobile: 50px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button,
input {
  font: inherit;
  border: none;
  outline: none;
  background: none;
}

ul {
  list-style: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Buttons ========== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #060a13;
  font-weight: 700;
  font-size: 15px;
  border-radius: 50px;
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
  line-height: 1.4;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(0, 229, 255, 0.2);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid var(--border-strong);
  color: var(--brand-primary);
  font-weight: 600;
  font-size: 15px;
  border-radius: 50px;
  background: transparent;
  transition: var(--transition-base);
  cursor: pointer;
  line-height: 1.4;
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--brand-primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
  border-radius: 50px;
  transition: var(--transition-base);
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
}

.btn-outline-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  font-weight: 600;
  font-size: 15px;
  border-radius: 50px;
  background: transparent;
  transition: var(--transition-base);
}

.btn-outline-light:hover {
  border-color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.btn-lg {
  padding: 14px 38px;
  font-size: 16px;
}

/* ========== Badge & Tag ========== */
.badge {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: var(--brand-primary);
  font-size: 12px;
  font-weight: 600;
  border-radius: 30px;
  letter-spacing: 0.05em;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--brand-primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 30px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-tag.light {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 11, 20, 0.85);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 70px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  gap: 2px;
  flex-shrink: 0;
}

.logo-neon {
  font-size: 22px;
  font-weight: 800;
  color: var(--brand-primary);
  letter-spacing: 0.02em;
  text-shadow: 0 0 12px var(--brand-glow), 0 0 30px rgba(0, 229, 255, 0.2);
}

.logo-sub {
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

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

.nav-link {
  position: relative;
  padding: 26px 2px 22px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  box-shadow: 0 0 10px var(--brand-primary);
  transform: translateX(-50%);
  transition: all 0.3s ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px;
  font-size: 14px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: var(--transition-base);
}

.nav-toggle:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

/* ========== Page Banner ========== */
.page-banner {
  background: linear-gradient(135deg, rgba(7, 11, 20, 0.92) 0%, rgba(13, 19, 34, 0.78) 60%, rgba(7, 11, 20, 0.85) 100%),
    url("/assets/images/backpic/back-1.png") center/cover no-repeat;
  padding: 110px 0 90px;
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.3s;
}

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

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

.page-banner h1 {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 18px;
  background: linear-gradient(135deg, #ffffff, #e0e9ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 2px 30px rgba(0, 229, 255, 0.12);
}

.page-banner p {
  max-width: 620px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

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

/* ========== Section Common ========== */
.section {
  padding: var(--space-section) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 48px;
}

.section-head h2 {
  font-size: 34px;
  font-weight: 750;
  line-height: 1.25;
  margin-top: 14px;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-head p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ========== Guide Cards ========== */
.guide-cards {
  background: var(--bg-primary);
}

.card-grid {
  display: grid;
  gap: 24px;
}

.card-grid.three-col {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background: linear-gradient(160deg, var(--bg-card) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-base);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(600px 200px at top left, rgba(0, 229, 255, 0.06), transparent);
  pointer-events: none;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-index {
  font-size: 40px;
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px rgba(0, 229, 255, 0.4);
  line-height: 1;
}

.card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

/* ========== Step Flow ========== */
.step-section {
  background: var(--bg-secondary);
  position: relative;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.step-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  position: relative;
  transition: var(--transition-base);
}

.step-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #060a13;
  font-size: 18px;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 18px;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.step-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== Feature Section ========== */
.feature-section {
  background: var(--bg-primary);
}

.feature-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.feature-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.media-tag {
  position: absolute;
  bottom: 20px;
  left: 20px;
  padding: 8px 18px;
  background: rgba(7, 11, 20, 0.75);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-strong);
  color: var(--brand-primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 30px;
}

.feature-content {
  padding: 10px 0;
}

.feature-content .section-tag {
  margin-bottom: 16px;
}

.feature-content h2 {
  font-size: 30px;
  font-weight: 750;
  line-height: 1.3;
  margin: 14px 0 16px;
}

.feature-content > p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 24px;
}

.check-list {
  margin-bottom: 28px;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.7;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid var(--brand-primary);
  border-radius: 50%;
  color: var(--brand-primary);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ========== Stats Section ========== */
.stats-section {
  background: linear-gradient(135deg, rgba(7, 11, 20, 0.92), rgba(13, 19, 34, 0.85)),
    url("/assets/images/backpic/back-2.png") center/cover fixed no-repeat;
  padding: 90px 0;
}

.stats-section .section-head {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.stats-section .section-head .section-tag {
  margin-bottom: 12px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 20px;
}

.stat-item {
  background: rgba(16, 24, 39, 0.7);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition-base);
}

.stat-item:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-num {
  display: block;
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

/* ========== Articles Section ========== */
.articles-section {
  background: var(--bg-secondary);
}

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

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.article-card img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.article-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-body .badge {
  align-self: flex-start;
  margin-bottom: 14px;
}

.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
}

.article-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 18px;
  flex: 1;
}

.article-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-primary);
  transition: var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-link:hover {
  gap: 10px;
  color: #ffffff;
}

/* ========== FAQ Section ========== */
.faq-section {
  background: var(--bg-primary);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(0, 229, 255, 0.2);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: color 0.3s;
}

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

.faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--brand-primary);
  transition: transform 0.3s ease, background 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 229, 255, 0.12);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 240px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

/* ========== CTA Section ========== */
.cta-section {
  background: linear-gradient(135deg, rgba(7, 11, 20, 0.9), rgba(13, 19, 34, 0.8)),
    url("/assets/images/backpic/back-3.png") center/cover fixed no-repeat;
  padding: 100px 0;
  text-align: center;
}

.cta-content {
  max-width: 680px;
  margin: 0 auto;
}

.cta-content .section-tag {
  margin-bottom: 20px;
}

.cta-content h2 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

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

/* ========== Footer ========== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 44px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 320px;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text-primary);
}

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

.footer-links ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.footer-links ul li a:hover {
  color: var(--brand-primary);
  padding-left: 6px;
}

.footer-contact .contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-secondary);
  transition: color 0.3s;
}

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

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .card-grid.three-col {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --space-section: 50px;
  }
  .container {
    padding: 0 20px;
  }
  .site-header {
    padding: 10px 0;
  }
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(7, 11, 20, 0.97);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px 24px 20px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open {
    display: flex;
  }
  .nav-link {
    width: 100%;
    padding: 14px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border-subtle);
  }
  .nav-link::after {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .page-banner {
    padding: 80px 0 60px;
  }
  .page-banner h1 {
    font-size: 32px;
  }
  .page-banner p {
    font-size: 16px;
  }
  .section-head h2 {
    font-size: 26px;
  }
  .card-grid.three-col {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .stat-item {
    padding: 24px 16px;
  }
  .stat-num {
    font-size: 32px;
  }
  .feature-media img {
    height: 280px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .cta-section {
    padding: 70px 0;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .logo-neon {
    font-size: 20px;
  }
  .page-banner h1 {
    font-size: 26px;
  }
  .banner-actions {
    flex-direction: column;
    align-items: flex-start;
  }
  .banner-actions .btn-primary,
  .banner-actions .btn-outline {
    width: 100%;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .section-head h2 {
    font-size: 22px;
  }
  .feature-media img {
    height: 220px;
  }
  .cta-content h2 {
    font-size: 26px;
  }
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-lg,
  .btn-outline-light {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* roulang page: category2 */
/* ===== 设计变量 ===== */
    :root {
      --primary: #00e5ff;
      --primary-dark: #009ec7;
      --primary-glow: rgba(0, 229, 255, 0.35);
      --accent: #ff3d71;
      --accent-glow: rgba(255, 61, 113, 0.3);
      --bg-dark: #0a0e17;
      --bg-deep: #070a11;
      --bg-card: #101726;
      --bg-card-hover: #151e2f;
      --text-main: #f0f5fa;
      --text-muted: #9fb0c3;
      --text-dim: #6b7c90;
      --border: rgba(255, 255, 255, 0.08);
      --border-light: rgba(0, 229, 255, 0.2);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --radius-pill: 999px;
      --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.3);
      --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 32px rgba(0, 229, 255, 0.12);
      --spacing-section: 6rem;
      --spacing-block: 2.5rem;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* ===== 基础 Reset ===== */
    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }

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

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

    button,
    input,
    textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: none;
    }

    ul,
    ol {
      list-style: none;
    }

    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
      line-height: 1.3;
      font-weight: 700;
    }

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== 按钮 ===== */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(135deg, var(--primary) 0%, #00b8d9 100%);
      color: #06121f;
      font-weight: 700;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      box-shadow: 0 4px 20px var(--primary-glow);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid rgba(0, 229, 255, 0.5);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 6px 28px rgba(0, 229, 255, 0.45);
      background: linear-gradient(135deg, #33eaff 0%, #00d4f0 100%);
    }

    .btn-primary:active {
      transform: translateY(0) scale(0.98);
    }

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

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.08);
      border-color: var(--primary);
      box-shadow: 0 4px 20px rgba(0, 229, 255, 0.15);
      transform: translateY(-2px);
    }

    .btn-secondary:focus-visible {
      outline: 3px solid var(--primary-glow);
      outline-offset: 2px;
    }

    .btn-accent {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(135deg, var(--accent) 0%, #c72e58 100%);
      color: #fff;
      font-weight: 700;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      box-shadow: 0 4px 20px var(--accent-glow);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid rgba(255, 61, 113, 0.4);
      white-space: nowrap;
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 28px rgba(255, 61, 113, 0.4);
    }

    /* ===== Header / 导航 ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(7, 10, 17, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    }

    .site-header::after {
      content: "";
      display: block;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
      opacity: 0.6;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      gap: 20px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      flex-shrink: 0;
    }

    .logo-neon {
      font-size: 24px;
      font-weight: 900;
      color: var(--primary);
      text-shadow: 0 0 14px var(--primary-glow), 0 0 40px rgba(0, 229, 255, 0.15);
      letter-spacing: 1px;
    }

    .logo-sub {
      font-size: 13px;
      font-weight: 500;
      color: var(--text-muted);
      letter-spacing: 2px;
      border-left: 1px solid var(--border);
      padding-left: 8px;
      line-height: 1.2;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 6px;
      flex: 1;
      justify-content: center;
    }

    .nav-link {
      color: var(--text-muted);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      position: relative;
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-link:hover {
      color: var(--text-main);
      background: rgba(255, 255, 255, 0.05);
    }

    .nav-link.active {
      color: var(--primary);
      background: rgba(0, 229, 255, 0.1);
      text-shadow: 0 0 12px var(--primary-glow);
    }

    .nav-link.active::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%);
      width: 24px;
      height: 3px;
      border-radius: 3px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary-glow);
    }

    .nav-cta {
      flex-shrink: 0;
      padding: 10px 22px;
      font-size: 14px;
    }

    .nav-toggle {
      display: none;
      width: 42px;
      height: 42px;
      border-radius: var(--radius-sm);
      color: var(--text-main);
      font-size: 22px;
      cursor: pointer;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border);
      transition: var(--transition);
    }

    .nav-toggle:hover {
      background: rgba(255, 255, 255, 0.05);
      border-color: var(--border-light);
    }

    .nav-toggle:focus-visible {
      outline: 3px solid var(--primary-glow);
      outline-offset: 2px;
    }

    /* ===== 页面 Banner ===== */
    .page-hero {
      position: relative;
      padding: 5rem 0 4rem;
      background: linear-gradient(135deg, rgba(7, 10, 17, 0.7) 0%, rgba(7, 10, 17, 0.9) 60%), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
      border-bottom: 1px solid var(--border);
      overflow: hidden;
    }

    .page-hero::before {
      content: "";
      position: absolute;
      top: -50%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.12) 0%, transparent 70%);
      pointer-events: none;
    }

    .page-hero-inner {
      position: relative;
      z-index: 1;
      max-width: 860px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      border-radius: var(--radius-pill);
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid var(--border-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.5px;
      margin-bottom: 18px;
      text-transform: uppercase;
    }

    .page-hero h1 {
      font-size: 40px;
      font-weight: 900;
      margin-bottom: 16px;
      line-height: 1.25;
      letter-spacing: 1px;
    }

    .page-hero h1 span {
      color: var(--primary);
      text-shadow: 0 0 24px var(--primary-glow);
    }

    .page-hero p {
      font-size: 17px;
      color: var(--text-muted);
      max-width: 640px;
      margin-bottom: 28px;
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    /* ===== 面包屑 ===== */
    .breadcrumb-bar {
      padding: 18px 0;
      background: var(--bg-deep);
      border-bottom: 1px solid var(--border);
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-dim);
      flex-wrap: wrap;
    }

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

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

    .breadcrumb .sep {
      color: var(--text-dim);
      opacity: 0.5;
    }

    .breadcrumb .current {
      color: var(--primary);
      font-weight: 500;
    }

    /* ===== 通用板块 ===== */
    .section {
      padding: var(--spacing-section) 0;
    }

    .section-alt {
      background: var(--bg-deep);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .section-top {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 2.5rem;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      letter-spacing: 1px;
      line-height: 1.3;
    }

    .section-title span {
      color: var(--primary);
      text-shadow: 0 0 20px var(--primary-glow);
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 15px;
      max-width: 560px;
      margin-top: 8px;
      line-height: 1.7;
    }

    .section-more {
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
      padding: 8px 0;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }

    .section-more:hover {
      border-bottom-color: var(--primary);
      color: #33eaff;
    }

    /* ===== 安全概览卡片 ===== */
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .security-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .security-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
      opacity: 0;
      transition: var(--transition);
    }

    .security-card:hover {
      transform: translateY(-6px);
      background: var(--bg-card-hover);
      border-color: var(--border-light);
      box-shadow: var(--shadow-md), var(--shadow-glow);
    }

    .security-card:hover::before {
      opacity: 1;
    }

    .security-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 16px;
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid var(--border-light);
      box-shadow: 0 4px 16px rgba(0, 229, 255, 0.1);
    }

    .security-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .security-card p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.65;
    }

    .security-tag {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: var(--radius-pill);
      background: rgba(0, 229, 255, 0.1);
      color: var(--primary);
      border: 1px solid var(--border-light);
      letter-spacing: 0.5px;
    }

    .security-tag.hot {
      background: rgba(255, 61, 113, 0.12);
      color: var(--accent);
      border-color: rgba(255, 61, 113, 0.3);
    }

    /* ===== 安全步骤流程 ===== */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 32px;
    }

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px 26px;
      position: relative;
      transition: var(--transition);
    }

    .step-card:hover {
      border-color: var(--border-light);
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      font-size: 18px;
      font-weight: 800;
      color: var(--primary);
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid var(--border-light);
      margin-bottom: 18px;
      font-feature-settings: "tnum";
    }

    .step-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-card p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .step-list {
      margin-top: 14px;
      padding-left: 18px;
      list-style: none;
    }

    .step-list li {
      position: relative;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
      padding-left: 4px;
      margin-bottom: 6px;
    }

    .step-list li::before {
      content: "▶";
      position: absolute;
      left: -18px;
      top: 0;
      color: var(--primary);
      font-size: 10px;
      opacity: 0.7;
    }

    /* ===== 数据统计 ===== */
    .stats-banner {
      position: relative;
      padding: 3.5rem 0;
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.08) 0%, rgba(7, 10, 17, 0.9) 70%), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stats-item {
      padding: 20px 12px;
    }

    .stats-number {
      font-size: 40px;
      font-weight: 900;
      color: var(--primary);
      text-shadow: 0 0 30px var(--primary-glow);
      line-height: 1.2;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }

    .stats-label {
      font-size: 14px;
      color: var(--text-muted);
      letter-spacing: 1px;
    }

    /* ===== 安全防护双栏 ===== */
    .split-grid {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 48px;
      align-items: center;
    }

    .split-img {
      border-radius: var(--radius-lg);
      overflow: hidden;
      position: relative;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
    }

    .split-img img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .split-img:hover img {
      transform: scale(1.04);
    }

    .split-img::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 60%, rgba(7, 10, 17, 0.25) 100%);
      pointer-events: none;
    }

    .split-tag {
      position: absolute;
      bottom: 18px;
      left: 18px;
      z-index: 1;
      background: rgba(7, 10, 17, 0.85);
      border: 1px solid var(--border-light);
      padding: 6px 16px;
      border-radius: var(--radius-pill);
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      backdrop-filter: blur(8px);
    }

    .split-content h2 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.35;
    }

    .split-content h2 span {
      color: var(--primary);
    }

    .split-content p {
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 18px;
      font-size: 15px;
    }

    .feature-list {
      margin: 20px 0 28px;
    }

    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 10px 0;
      color: var(--text-main);
      font-size: 15px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

    .feature-list li:last-child {
      border-bottom: none;
    }

    .feature-list .check-icon {
      flex-shrink: 0;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(0, 229, 255, 0.12);
      border: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      color: var(--primary);
      margin-top: 3px;
    }

    .badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 5px 14px;
      border-radius: var(--radius-pill);
      background: var(--bg-card);
      border: 1px solid var(--border);
      font-size: 13px;
      color: var(--text-muted);
      transition: var(--transition);
    }

    .badge:hover {
      border-color: var(--border-light);
      color: var(--primary);
      background: rgba(0, 229, 255, 0.06);
    }

    .badge svg or .badge-icon {
      font-size: 14px;
    }

    /* ===== 安全功能网格 ===== */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 26px 24px;
      display: flex;
      gap: 18px;
      align-items: flex-start;
      transition: var(--transition);
    }

    .feature-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--border-light);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .feature-card .feature-icon {
      width: 44px;
      height: 44px;
      min-width: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      background: rgba(0, 229, 255, 0.08);
      border: 1px solid var(--border-light);
    }

    .feature-card:nth-child(2n) .feature-icon {
      background: rgba(255, 61, 113, 0.08);
      border-color: rgba(255, 61, 113, 0.25);
    }

    .feature-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .feature-card .feature-link {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 10px;
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      transition: var(--transition);
    }

    .feature-card .feature-link:hover {
      color: #33eaff;
      transform: translateX(2px);
    }

    /* ===== FAQ ===== */
    .faq-wrap {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: var(--border-light);
    }

    .faq-q {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 20px 24px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
      text-align: left;
      width: 100%;
      background: transparent;
    }

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

    .faq-q .faq-icon {
      width: 28px;
      height: 28px;
      min-width: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid var(--border-light);
      color: var(--primary);
      font-size: 16px;
      font-weight: 400;
      transition: var(--transition);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: rgba(0, 229, 255, 0.2);
    }

    .faq-a {
      display: none;
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.8;
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      margin: 0 24px 0;
      padding-left: 0;
      padding-right: 0;
    }

    .faq-item.active .faq-a {
      display: block;
    }

    .faq-a p {
      margin-bottom: 8px;
    }

    .faq-a ul {
      list-style: none;
      padding-left: 0;
    }

    .faq-a ul li {
      position: relative;
      padding-left: 18px;
      margin-bottom: 6px;
    }

    .faq-a ul li::before {
      content: "→";
      position: absolute;
      left: 0;
      color: var(--primary);
      opacity: 0.7;
    }

    /* ===== CTA 区块 ===== */
    .cta-section {
      position: relative;
      padding: 4.5rem 0;
      background: linear-gradient(135deg, rgba(0, 229, 255, 0.1) 0%, rgba(7, 10, 17, 0.85) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      overflow: hidden;
    }

    .cta-section::before {
      content: "";
      position: absolute;
      top: -100px;
      left: 20%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.15) 0%, transparent 70%);
      pointer-events: none;
    }

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

    .cta-inner h2 {
      font-size: 32px;
      font-weight: 900;
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .cta-inner h2 span {
      color: var(--primary);
      text-shadow: 0 0 24px var(--primary-glow);
    }

    .cta-inner p {
      color: var(--text-muted);
      font-size: 16px;
      margin-bottom: 30px;
      line-height: 1.8;
    }

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

    /* ===== 页脚 ===== */
    .site-footer {
      background: var(--bg-deep);
      border-top: 2px solid var(--border);
      padding: 3.5rem 0 0;
      position: relative;
    }

    .site-footer::before {
      content: "";
      display: block;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary), var(--accent), transparent);
      opacity: 0.4;
      position: absolute;
      top: -2px;
      left: 0;
      right: 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      padding-bottom: 2.5rem;
      border-bottom: 1px solid var(--border);
    }

    .footer-brand .logo {
      margin-bottom: 16px;
      display: inline-flex;
    }

    .footer-brand p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.8;
      margin-top: 14px;
    }

    .footer-links h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--text-main);
      letter-spacing: 0.5px;
    }

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

    .footer-links ul li a {
      color: var(--text-muted);
      font-size: 14px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .footer-links ul li a::before {
      content: "›";
      color: var(--primary);
      font-size: 16px;
      opacity: 0;
      transform: translateX(-4px);
      transition: var(--transition);
    }

    .footer-links ul li a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

    .footer-links ul li a:hover::before {
      opacity: 1;
      transform: translateX(0);
    }

    .footer-contact h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--text-main);
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-muted);
      font-size: 14px;
      margin-bottom: 12px;
      transition: var(--transition);
    }

    .contact-item:hover {
      color: var(--text-main);
    }

    .contact-item span[aria-hidden] {
      width: 34px;
      height: 34px;
      min-width: 34px;
      border-radius: 10px;
      background: rgba(0, 229, 255, 0.06);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 20px 0;
      flex-wrap: wrap;
      color: var(--text-dim);
      font-size: 13px;
    }

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

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

    /* ===== 响应式 ===== */
    @media (max-width: 1024px) {
      :root {
        --spacing-section: 4.5rem;
      }

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

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

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

      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }

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

      .main-nav {
        gap: 4px;
      }

      .nav-link {
        padding: 8px 12px;
        font-size: 14px;
      }

      .page-hero h1 {
        font-size: 34px;
      }
    }

    @media (max-width: 768px) {
      :root {
        --spacing-section: 3.5rem;
      }

      .header-inner {
        height: auto;
        padding: 14px 0;
        flex-wrap: wrap;
        gap: 12px;
      }

      .nav-toggle {
        display: flex;
        margin-left: auto;
      }

      .main-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        padding: 12px 0 4px;
        order: 3;
      }

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

      .nav-link {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        font-size: 15px;
        text-align: left;
        border-bottom: 1px solid var(--border);
      }

      .nav-link.active::after {
        display: none;
      }

      .nav-link.active {
        background: rgba(0, 229, 255, 0.08);
        border-left: 3px solid var(--primary);
      }

      .nav-cta {
        order: 2;
        margin-left: auto;
        padding: 8px 16px;
        font-size: 13px;
      }

      .page-hero {
        padding: 3.5rem 0 3rem;
      }

      .page-hero h1 {
        font-size: 28px;
      }

      .page-hero p {
        font-size: 15px;
      }

      .section-title {
        font-size: 24px;
      }

      .section-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
      }

      .security-grid {
        grid-template-columns: 1fr;
        gap: 14px;
      }

      .steps-grid {
        grid-template-columns: 1fr;
        gap: 14px;
      }

      .feature-grid {
        grid-template-columns: 1fr;
        gap: 14px;
      }

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

      .split-img img {
        height: 250px;
      }

      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }

      .stats-number {
        font-size: 30px;
      }

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

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

      .cta-inner h2 {
        font-size: 24px;
      }

      .hero-actions .btn-primary,
      .hero-actions .btn-secondary,
      .cta-actions .btn-primary,
      .cta-actions .btn-accent {
        width: 100%;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }

      .header-inner {
        gap: 8px;
      }

      .logo-neon {
        font-size: 20px;
      }

      .logo-sub {
        font-size: 11px;
        letter-spacing: 1px;
      }

      .page-hero h1 {
        font-size: 24px;
      }

      .page-hero p {
        font-size: 14px;
      }

      .btn-primary,
      .btn-secondary,
      .btn-accent {
        padding: 10px 20px;
        font-size: 14px;
      }

      .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
      }

      .stats-number {
        font-size: 26px;
      }

      .stats-label {
        font-size: 12px;
      }

      .section-title {
        font-size: 22px;
      }

      .section-desc {
        font-size: 14px;
      }

      .security-card {
        padding: 22px 18px;
      }

      .step-card {
        padding: 24px 20px;
      }

      .feature-card {
        flex-direction: column;
        gap: 12px;
      }

      .feature-card .feature-icon {
        min-width: 40px;
        width: 40px;
        height: 40px;
      }

      .faq-q {
        padding: 16px 18px;
        font-size: 15px;
      }

      .faq-a {
        font-size: 13px;
        padding-bottom: 16px;
      }

      .footer-grid {
        gap: 24px;
      }

      .footer-bottom {
        font-size: 12px;
      }
    }

    /* ===== 额外内容组件 ===== */
    .cover-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .cover-card {
      border-radius: var(--radius-lg);
      overflow: hidden;
      position: relative;
      background: var(--bg-card);
      border: 1px solid var(--border);
      transition: var(--transition);
      display: block;
    }

    .cover-card:hover {
      transform: translateY(-6px);
      border-color: var(--border-light);
      box-shadow: var(--shadow-md), var(--shadow-glow);
    }

    .cover-card .cover-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .cover-card:hover .cover-img {
      transform: scale(1.05);
    }

    .cover-card-body {
      padding: 20px 22px 22px;
    }

    .cover-card-body h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .cover-card-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 14px;
    }

    .cover-card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 12px;
    }

    .mini-tag {
      font-size: 12px;
      padding: 3px 12px;
      border-radius: var(--radius-pill);
      background: rgba(0, 229, 255, 0.07);
      border: 1px solid rgba(0, 229, 255, 0.15);
      color: var(--primary);
      font-weight: 500;
    }

    .cover-card-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      color: var(--text-dim);
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      padding-top: 12px;
    }

    .read-more {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 13px;
      transition: var(--transition);
    }

    .read-more:hover {
      color: #33eaff;
      transform: translateX(2px);
    }

/* roulang page: category3 */
:root {
    --bg-dark: #070b14;
    --bg-body: #0b1120;
    --bg-soft: #101a2e;
    --bg-card: #121c31;
    --bg-card-hover: #17233d;
    --primary: #00e5ff;
    --primary-2: #7c4dff;
    --accent: #ff3d81;
    --gradient-main: linear-gradient(120deg, #00e5ff, #7c4dff);
    --text-main: #eaf0fa;
    --text-weak: #8b95ab;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 24px 60px rgba(0, 229, 255, 0.12);
    --transition: all .3s ease;
    --container: 1200px;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-body);
    color: var(--text-main);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
  }

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

  a {
    text-decoration: none;
    color: inherit;
  }

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

  input {
    font-family: inherit;
    border: none;
    outline: none;
  }

  ul, ol {
    list-style: none;
  }

  .container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ===== Header ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(7, 11, 20, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  }

  .site-header::after {
    content: "";
    display: block;
    height: 2px;
    background: var(--gradient-main);
    box-shadow: 0 0 18px rgba(0, 229, 255, 0.4);
  }

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

  .logo {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
    flex-shrink: 0;
    transition: var(--transition);
  }

  .logo:hover {
    opacity: 0.85;
  }

  .logo-neon {
    font-size: 26px;
    font-weight: 800;
    letter-spacing: 1px;
    background: linear-gradient(120deg, #00e5ff, #7c4dff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 12px rgba(0, 229, 255, 0.35));
  }

  .logo-sub {
    font-size: 13px;
    color: var(--text-weak);
    letter-spacing: 2px;
    white-space: nowrap;
  }

  .nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 20px;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }

  .nav-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
  }

  .nav-link {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-weak);
    transition: var(--transition);
    border: 1px solid transparent;
  }

  .nav-link:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--border);
  }

  .nav-link.active {
    color: #fff;
    background: rgba(0, 229, 255, 0.12);
    border-color: rgba(0, 229, 255, 0.35);
    box-shadow: 0 0 16px rgba(0, 229, 255, 0.12);
  }

  .nav-cta {
    margin-left: 8px;
    white-space: nowrap;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    background: var(--gradient-main);
    box-shadow: 0 8px 24px rgba(0, 229, 255, 0.25);
    transition: var(--transition);
    border: none;
    cursor: pointer;
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(124, 77, 255, 0.35);
    color: #fff;
  }

  .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 14px rgba(0, 229, 255, 0.2);
  }

  .btn-primary:focus-visible,
  .nav-toggle:focus-visible,
  .nav-link:focus-visible,
  .faq-q:focus-visible,
  a:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
  }

  /* ===== Page Hero ===== */
  .page-hero {
    position: relative;
    padding: 90px 0 80px;
    background: linear-gradient(180deg, rgba(7, 11, 20, 0.72), rgba(11, 17, 32, 0.95)), url('/assets/images/backpic/back-2.png') center / cover no-repeat;
    border-bottom: 1px solid var(--border);
  }

  .page-hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, rgba(7, 11, 20, 0.6), transparent);
    pointer-events: none;
  }

  .page-hero .hero-inner {
    position: relative;
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    border-radius: 999px;
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.3);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 22px;
    letter-spacing: 1px;
  }

  .hero-badge i {
    font-size: 14px;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
  }

  .page-hero h1 {
    font-size: clamp(30px, 5vw, 48px);
    line-height: 1.25;
    font-weight: 800;
    margin-bottom: 18px;
  }

  .page-hero h1 .gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .page-hero .hero-desc {
    font-size: 17px;
    color: var(--text-weak);
    line-height: 1.8;
    margin-bottom: 32px;
  }

  .hero-search {
    display: flex;
    max-width: 560px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 6px 6px 22px;
    backdrop-filter: blur(8px);
    transition: var(--transition);
  }

  .hero-search:focus-within {
    border-color: rgba(0, 229, 255, 0.5);
    box-shadow: 0 0 24px rgba(0, 229, 255, 0.15);
  }

  .hero-search input {
    flex: 1;
    background: transparent;
    color: var(--text-main);
    font-size: 15px;
    min-width: 0;
  }

  .hero-search input::placeholder {
    color: var(--text-weak);
  }

  .hero-search button {
    background: var(--gradient-main);
    border-radius: 999px;
    padding: 10px 24px;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
    white-space: nowrap;
  }

  .hero-search button:hover {
    box-shadow: 0 6px 20px rgba(0, 229, 255, 0.3);
  }

  /* ===== Section Common ===== */
  .section {
    padding: 84px 0;
  }

  .section-alt {
    background: var(--bg-soft);
  }

  .section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 52px;
  }

  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid rgba(0, 229, 255, 0.25);
    padding: 6px 16px;
    border-radius: 999px;
    margin-bottom: 14px;
    letter-spacing: 1px;
  }

  .section-head h2 {
    font-size: clamp(26px, 3.6vw, 36px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 14px;
  }

  .section-head h2 .gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .section-head p {
    color: var(--text-weak);
    font-size: 16px;
    line-height: 1.8;
  }

  /* ===== Help Category Cards ===== */
  .help-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .help-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .help-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
    opacity: 0;
    transition: var(--transition);
  }

  .help-card:hover {
    transform: translateY(-8px);
    background: var(--bg-card-hover);
    border-color: rgba(0, 229, 255, 0.25);
    box-shadow: var(--shadow-hover);
  }

  .help-card:hover::before {
    opacity: 1;
  }

  .help-card .icon-wrap {
    width: 60px;
    height: 60px;
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(124, 77, 255, 0.15));
    border: 1px solid rgba(0, 229, 255, 0.2);
    color: var(--primary);
  }

  .help-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
  }

  .help-card p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.7;
    margin-bottom: 16px;
  }

  .help-card .card-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
  }

  .help-card .card-link i {
    transition: transform .3s ease;
  }

  .help-card .card-link:hover {
    color: #fff;
  }

  .help-card .card-link:hover i {
    transform: translateX(4px);
  }

  /* ===== Hot Questions ===== */
  .hot-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .hot-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .hot-item {
    display: flex;
    gap: 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px 22px;
    transition: var(--transition);
    cursor: pointer;
  }

  .hot-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 229, 255, 0.3);
    transform: translateX(6px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  }

  .hot-num {
    font-size: 22px;
    font-weight: 800;
    font-style: italic;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    min-width: 46px;
    opacity: 0.85;
  }

  .hot-body h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
  }

  .hot-body p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.6;
  }

  .hot-side {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  .hot-side img {
    width: 100%;
    height: 100%;
    min-height: 320px;
    object-fit: cover;
    transition: transform .6s ease;
  }

  .hot-side:hover img {
    transform: scale(1.05);
  }

  .hot-side::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(7, 11, 20, 0.7));
  }

  .hot-side-caption {
    position: absolute;
    bottom: 24px;
    left: 24px;
    right: 24px;
    z-index: 2;
  }

  .hot-side-caption span {
    display: inline-block;
    background: var(--gradient-main);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
  }

  .hot-side-caption h3 {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    line-height: 1.4;
  }

  /* ===== Step Guide ===== */
  .step-guide {
    background: linear-gradient(160deg, rgba(16, 26, 46, 0.9), rgba(7, 11, 20, 0.95));
    position: relative;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .step-wrap {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-top: 20px;
  }

  .step-item {
    position: relative;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 24px;
    transition: var(--transition);
  }

  .step-item:hover {
    border-color: rgba(0, 229, 255, 0.35);
    box-shadow: 0 12px 32px rgba(0, 229, 255, 0.08);
    transform: translateY(-4px);
  }

  .step-num {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .step-num::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary);
  }

  .step-item h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
  }

  .step-item p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.7;
  }

  .step-item .step-icon {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 36px;
    opacity: 0.12;
    color: var(--primary);
    transition: var(--transition);
  }

  .step-item:hover .step-icon {
    opacity: 0.3;
    transform: scale(1.1);
  }

  /* ===== FAQ Accordion ===== */
  .faq-layout {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 44px;
    align-items: start;
  }

  .faq-side {
    position: sticky;
    top: 110px;
  }

  .faq-side-img {
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    position: relative;
  }

  .faq-side-img img {
    width: 100%;
    height: 220px;
    object-fit: cover;
  }

  .faq-side-img::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(7, 11, 20, 0.6));
  }

  .faq-contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
  }

  .faq-contact-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
  }

  .faq-contact-card p {
    font-size: 14px;
    color: var(--text-weak);
    margin-bottom: 18px;
  }

  .faq-contact-card .contact-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    padding: 10px 0;
    border-top: 1px solid var(--border);
  }

  .faq-contact-card .contact-row i {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 229, 255, 0.1);
    color: var(--primary);
  }

  .faq-group {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 24px;
    overflow: hidden;
    transition: var(--transition);
  }

  .faq-group:hover {
    border-color: rgba(0, 229, 255, 0.25);
  }

  .faq-group-title {
    padding: 16px 24px;
    font-size: 16px;
    font-weight: 700;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 229, 255, 0.04);
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .faq-group-title i {
    color: var(--primary);
  }

  .faq-item {
    border-bottom: 1px solid var(--border);
  }

  .faq-item:last-child {
    border-bottom: none;
  }

  .faq-q {
    width: 100%;
    text-align: left;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    color: var(--text-main);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
  }

  .faq-q:hover {
    color: var(--primary);
    background: rgba(0, 229, 255, 0.03);
  }

  .faq-q .faq-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--text-weak);
    transition: var(--transition);
  }

  .faq-item.open .faq-q .faq-icon {
    background: var(--gradient-main);
    color: #fff;
    border-color: transparent;
    transform: rotate(45deg);
  }

  .faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height .4s ease;
  }

  .faq-item.open .faq-a {
    max-height: 300px;
  }

  .faq-a p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.8;
  }

  /* ===== Stats ===== */
  .stats-section {
    background: linear-gradient(150deg, rgba(124, 77, 255, 0.08), transparent 60%), var(--bg-soft);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
  }

  .stat-item {
    text-align: center;
    padding: 36px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
  }

  .stat-item:hover {
    transform: translateY(-6px);
    border-color: rgba(0, 229, 255, 0.3);
    box-shadow: var(--shadow-hover);
  }

  .stat-num {
    font-size: 42px;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
    line-height: 1.2;
  }

  .stat-label {
    font-size: 14px;
    color: var(--text-weak);
    letter-spacing: 1px;
  }

  /* ===== CTA ===== */
  .cta-section {
    padding: 90px 0;
    position: relative;
    background: linear-gradient(180deg, rgba(11, 17, 32, 0.9), rgba(7, 11, 20, 0.95)), url('/assets/images/backpic/back-3.png') center / cover no-repeat;
  }

  .cta-box {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    background: rgba(18, 28, 49, 0.85);
    border: 1px solid rgba(0, 229, 255, 0.25);
    border-radius: 24px;
    padding: 56px 40px;
    backdrop-filter: blur(12px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
  }

  .cta-box::before {
    content: "";
    position: absolute;
    top: -60%;
    left: -60%;
    width: 220%;
    height: 220%;
    background: radial-gradient(circle, rgba(0, 229, 255, 0.12) 0%, transparent 60%);
    pointer-events: none;
  }

  .cta-box h2 {
    font-size: clamp(24px, 3.4vw, 34px);
    font-weight: 800;
    margin-bottom: 14px;
    position: relative;
  }

  .cta-box p {
    color: var(--text-weak);
    font-size: 16px;
    margin-bottom: 30px;
    position: relative;
  }

  .cta-btns {
    position: relative;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    transition: var(--transition);
  }

  .btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
  }

  /* ===== Footer ===== */
  .site-footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    padding-top: 60px;
  }

  .site-footer::before {
    content: "";
    display: block;
    height: 2px;
    background: var(--gradient-main);
    opacity: 0.8;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
    gap: 40px;
    padding-bottom: 44px;
  }

  .footer-brand .logo {
    margin-bottom: 16px;
  }

  .footer-brand p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.8;
    max-width: 320px;
    margin-top: 12px;
  }

  .footer-links h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--text-main);
  }

  .footer-links ul li {
    margin-bottom: 12px;
  }

  .footer-links ul li a {
    font-size: 14px;
    color: var(--text-weak);
    transition: var(--transition);
  }

  .footer-links ul li a:hover {
    color: var(--primary);
    padding-left: 4px;
  }

  .footer-contact h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 18px;
  }

  .contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-weak);
    margin-bottom: 12px;
  }

  .contact-item span {
    font-size: 16px;
  }

  .footer-bottom {
    border-top: 1px solid var(--border);
    padding: 22px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--text-weak);
  }

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

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

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .help-cards {
      grid-template-columns: repeat(2, 1fr);
    }

    .hot-layout {
      grid-template-columns: 1fr;
      gap: 32px;
    }

    .faq-layout {
      grid-template-columns: 1fr;
      gap: 32px;
    }

    .faq-side {
      position: static;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .faq-side-img {
      margin-bottom: 0;
    }

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

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

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

  @media (max-width: 768px) {
    .header-inner {
      height: 64px;
      gap: 14px;
    }

    .nav-toggle {
      display: inline-flex;
      margin-left: auto;
    }

    .main-nav {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: rgba(7, 11, 20, 0.98);
      flex-direction: column;
      align-items: stretch;
      padding: 16px 24px;
      gap: 6px;
      border-top: 1px solid var(--border);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      display: none;
    }

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

    .nav-link {
      text-align: center;
      padding: 12px;
      font-size: 15px;
    }

    .nav-cta {
      display: none;
    }

    .section {
      padding: 60px 0;
    }

    .section-head {
      margin-bottom: 36px;
    }

    .page-hero {
      padding: 60px 0 56px;
    }

    .hero-search {
      flex-direction: column;
      background: transparent;
      padding: 0;
      border: none;
    }

    .hero-search input {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid var(--border);
      border-radius: 999px;
      padding: 12px 20px;
      text-align: center;
    }

    .hero-search button {
      justify-content: center;
      margin-top: 10px;
    }

    .cta-box {
      padding: 40px 24px;
    }
  }

  @media (max-width: 520px) {
    .container {
      padding: 0 18px;
    }

    .logo-neon {
      font-size: 22px;
    }

    .logo-sub {
      font-size: 11px;
    }

    .help-cards {
      grid-template-columns: 1fr;
    }

    .step-wrap {
      grid-template-columns: 1fr;
    }

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

    .hot-item {
      flex-direction: column;
      gap: 8px;
    }

    .hot-num {
      min-width: auto;
    }

    .faq-side {
      grid-template-columns: 1fr;
    }

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

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

    .cta-btns {
      flex-direction: column;
      align-items: stretch;
    }

    .cta-btns .btn-primary,
    .cta-btns .btn-outline {
      width: 100%;
    }
  }