/* roulang page: index */
/* ===== Design System ===== */
:root {
  --primary: #0b2545;
  --primary-2: #13315c;
  --primary-soft: #e8f0fe;
  --accent: #f0a500;
  --accent-dark: #d18e00;
  --accent-soft: #fff7e8;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #182233;
  --muted: #64748b;
  --border: #e6ebf2;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 8px rgba(11, 37, 69, 0.06);
  --shadow-md: 0 8px 24px rgba(11, 37, 69, 0.08);
  --shadow-lg: 0 16px 40px rgba(11, 37, 69, 0.12);
  --transition: all 0.25s ease;
  --container: 1200px;
  --sidebar-w: 260px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; font-size: 1rem; outline: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; font-weight: 700; line-height: 1.3; color: var(--text); }
.container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }

/* ===== Sidebar / 左侧导航 ===== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
  display: flex;
  flex-direction: column;
  padding: 30px 22px 24px;
  z-index: 200;
  overflow-y: auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 4px 26px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, #ffc94d 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary);
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(240, 165, 0, 0.35);
}
.brand-text {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.5px;
}
.side-nav { margin-top: 24px; display: flex; flex-direction: column; gap: 6px; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  border-left: 3px solid transparent;
}
.nav-link i { width: 20px; text-align: center; font-size: 16px; }
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
  border-left-color: var(--accent);
  font-weight: 600;
}
.sidebar-bottom { margin-top: auto; padding-top: 24px; }
.side-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.side-card i { color: var(--accent); font-size: 22px; margin-bottom: 4px; }
.side-card strong { color: #fff; font-size: 14px; }
.side-card span { color: rgba(255, 255, 255, 0.6); font-size: 13px; line-height: 1.5; }

/* ===== Main Wrap ===== */
.main-wrapper { margin-left: var(--sidebar-w); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
section { padding: 80px 0; }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 6px 16px;
  border-radius: 40px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.section-head h2 { font-size: 32px; margin-bottom: 12px; }
.section-head p { color: var(--muted); font-size: 16px; line-height: 1.8; margin-bottom: 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 30px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}
.btn-primary { background: var(--accent); color: var(--primary); }
.btn-primary:hover { background: #ffb81c; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(240, 165, 0, 0.35); }
.btn-ghost { background: rgba(255, 255, 255, 0.12); color: #fff; border: 1px solid rgba(255, 255, 255, 0.4); box-shadow: none; }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.2); transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { background: var(--primary-soft); transform: translateY(-2px); }
.btn:focus-visible, .nav-link:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 110px 0 100px;
  background-image: linear-gradient(120deg, rgba(11, 37, 69, 0.92) 0%, rgba(19, 49, 92, 0.82) 55%, rgba(11, 37, 69, 0.68) 100%), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center center;
  color: #fff;
  overflow: hidden;
}
.hero-inner { max-width: 680px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 8px 18px;
  border-radius: 40px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 24px;
}
.hero-badge i { color: var(--accent); }
.hero h1 { font-size: 44px; color: #fff; margin-bottom: 18px; letter-spacing: 1px; }
.hero p { font-size: 17px; color: rgba(255, 255, 255, 0.82); line-height: 1.9; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 40px; flex-wrap: wrap; padding-top: 28px; border-top: 1px solid rgba(255, 255, 255, 0.18); }
.hero-stat strong { font-size: 28px; color: #fff; display: block; line-height: 1.2; }
.hero-stat span { font-size: 14px; color: rgba(255, 255, 255, 0.66); }

/* ===== Features ===== */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-6px); border-color: transparent; }
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 18px;
}
.feature-card:nth-child(2) .feature-icon { background: var(--accent-soft); color: var(--accent-dark); }
.feature-card:nth-child(3) .feature-icon { background: #e6f7ec; color: #1a8f55; }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { color: var(--muted); font-size: 14px; line-height: 1.75; margin: 0; }

/* ===== Categories ===== */
.section-cats { background: var(--bg); }
.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.cat-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.cat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-8px); }
.cat-cover { position: relative; height: 180px; overflow: hidden; }
.cat-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.cat-card:hover .cat-cover img { transform: scale(1.05); }
.cat-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 37, 69, 0.05) 0%, rgba(11, 37, 69, 0.35) 100%);
}
.cat-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 30px;
  z-index: 2;
}
.cat-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.cat-body h3 { font-size: 19px; margin-bottom: 8px; }
.cat-body p { color: var(--muted); font-size: 14px; line-height: 1.7; margin-bottom: 18px; flex: 1; }
.cat-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.cat-link i { transition: transform 0.25s ease; }
.cat-link:hover { color: var(--accent-dark); }
.cat-link:hover i { transform: translateX(4px); }

/* ===== Flow ===== */
.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: step; }
.flow-item { position: relative; padding: 36px 24px 28px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); text-align: center; transition: var(--transition); }
.flow-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.flow-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  box-shadow: 0 6px 16px rgba(11, 37, 69, 0.25);
}
.flow-item:nth-child(2) .flow-num { background: var(--accent); color: var(--primary); }
.flow-item:nth-child(3) .flow-num { background: #1a8f55; }
.flow-item:nth-child(4) .flow-num { background: #7c5cff; }
.flow-item h3 { font-size: 16px; margin-bottom: 8px; }
.flow-item p { font-size: 13px; color: var(--muted); line-height: 1.7; margin: 0; }

/* ===== News Section ===== */
.section-news { background: var(--bg); }
.news-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: var(--transition);
}
.news-item:hover { box-shadow: var(--shadow-md); transform: translateX(6px); border-color: transparent; }
.news-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--primary);
}
.news-content { flex: 1; min-width: 0; }
.news-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.news-cat { font-size: 12px; color: var(--accent-dark); background: var(--accent-soft); padding: 2px 12px; border-radius: 20px; font-weight: 600; }
.news-date { font-size: 13px; color: var(--muted); }
.news-item h3 { font-size: 16px; margin-bottom: 6px; line-height: 1.5; }
.news-item h3 a { color: var(--text); transition: var(--transition); }
.news-item h3 a:hover { color: var(--primary); }
.news-item p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.empty-state {
  grid-column: 1 / -1;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 30px;
  text-align: center;
  color: var(--muted);
}
.empty-state i { font-size: 36px; color: #c0ccda; margin-bottom: 14px; display: block; }
.empty-state p { margin: 0; font-size: 15px; }
.news-side-card {
  background: var(--primary);
  border-radius: var(--radius);
  padding: 36px 32px;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-image: linear-gradient(135deg, rgba(11, 37, 69, 0.95) 0%, rgba(19, 49, 92, 0.88) 100%), url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
}
.news-side-card i { font-size: 30px; color: var(--accent); margin-bottom: 18px; }
.news-side-card h3 { color: #fff; font-size: 20px; margin-bottom: 12px; }
.news-side-card p { color: rgba(255, 255, 255, 0.78); font-size: 14px; line-height: 1.8; margin-bottom: 22px; }
.news-side-card .btn { align-self: flex-start; }

/* ===== Stats Section ===== */
.section-stats {
  background-image: linear-gradient(100deg, rgba(11, 37, 69, 0.96) 0%, rgba(19, 49, 92, 0.9) 100%), url('/assets/images/backpic/back-3.png');
  background-size: cover;
  background-position: center;
  color: #fff;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat-item { padding: 24px 12px; }
.stat-num { font-size: 42px; font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: 6px; }
.stat-num small { font-size: 22px; color: var(--accent); font-weight: 600; margin-left: 2px; }
.stat-item span { display: block; color: rgba(255, 255, 255, 0.7); font-size: 15px; }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-md); }
.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  transition: var(--transition);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--accent); font-size: 18px; transition: transform 0.3s ease; }
.faq-item[open] summary { color: var(--primary); }
.faq-item[open] summary i { transform: rotate(45deg); }
.faq-answer { padding: 0 26px 24px; color: var(--muted); font-size: 15px; line-height: 1.8; border-top: 1px solid var(--border); padding-top: 16px; margin-top: 0; }

/* ===== CTA ===== */
.section-cta { padding: 40px 0 80px; }
.cta-box {
  background: linear-gradient(120deg, var(--primary) 0%, var(--primary-2) 100%);
  border-radius: 20px;
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.cta-box::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(240, 165, 0, 0.18);
}
.cta-text h2 { color: #fff; font-size: 27px; margin-bottom: 10px; }
.cta-text p { color: rgba(255, 255, 255, 0.75); font-size: 15px; margin: 0; }
.cta-box .btn { position: relative; flex-shrink: 0; }

/* ===== Footer ===== */
.site-footer {
  background: #081a33;
  color: rgba(255, 255, 255, 0.65);
  padding: 56px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .brand-text { color: #fff; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin: 18px 0 0; max-width: 360px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: rgba(255, 255, 255, 0.65); transition: var(--transition); display: inline-flex; align-items: center; gap: 8px; }
.footer-col a i { font-size: 12px; color: var(--accent); }
.footer-col a:hover { color: #fff; transform: translateX(4px); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom a { color: rgba(255, 255, 255, 0.55); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root { --sidebar-w: 240px; }
  .hero h1 { font-size: 38px; }
  .feature-grid, .cat-grid { gap: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .news-wrap { grid-template-columns: 1fr; }
  .cta-box { flex-direction: column; text-align: center; padding: 44px 28px; }
  .cta-box .btn { align-self: center; }
}
@media (max-width: 991px) {
  .sidebar {
    position: sticky;
    top: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    overflow-x: auto;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .brand { border-bottom: none; padding: 0; flex-shrink: 0; }
  .brand-mark { width: 38px; height: 38px; font-size: 17px; }
  .brand-text { font-size: 14px; }
  .side-nav { flex-direction: row; margin: 0; gap: 4px; }
  .nav-link {
    padding: 9px 14px;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: 8px;
    font-size: 14px;
  }
  .nav-link.active { border-left: none; border-bottom-color: var(--accent); }
  .sidebar-bottom { display: none; }
  .main-wrapper { margin-left: 0; }
}
@media (max-width: 767px) {
  section { padding: 60px 0; }
  .hero { padding: 80px 0; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .hero-stats { gap: 24px; }
  .hero-stat strong { font-size: 22px; }
  .feature-grid, .cat-grid { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: 1fr; gap: 16px; }
  .section-head h2 { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .faq-item summary { font-size: 15px; padding: 18px 20px; }
  .faq-answer { padding: 0 20px 20px; }
  .stat-num { font-size: 34px; }
  .news-item { flex-direction: row; padding: 16px; }
  .news-icon { width: 38px; height: 38px; font-size: 15px; }
}
@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .sidebar { padding: 10px 12px; }
  .brand-text { display: none; }
  .nav-link { padding: 8px 12px; font-size: 13px; }
  .hero h1 { font-size: 27px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .cta-box { padding: 36px 22px; }
  .cta-text h2 { font-size: 22px; }
}

/* roulang page: category1 */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #10b981;
  --accent-dark: #059669;
  --accent-light: #d1fae5;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.10);
  --transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --sidebar-w: 280px;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;transition:var(--transition)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button,input{font-family:inherit;font-size:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 32px}
.site-shell{display:flex;min-height:100vh}
.side-nav{
  width:var(--sidebar-w);
  min-height:100vh;
  position:fixed;left:0;top:0;z-index:1000;
  background:linear-gradient(180deg,#0f172a 0%,#1e293b 100%);
  display:flex;flex-direction:column;
  border-right:1px solid rgba(255,255,255,0.06);
  padding:32px 22px;
  transition:var(--transition);
}
.brand{display:flex;align-items:center;gap:12px;margin-bottom:44px;padding:0 8px}
.brand-mark{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#2563eb,#06b6d4);display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;box-shadow:0 8px 24px rgba(37,99,235,0.35);flex-shrink:0}
.brand-text{font-size:17px;font-weight:700;color:#f1f5f9;line-height:1.3;letter-spacing:0.3px}
.nav-links{flex:1;display:flex;flex-direction:column;gap:6px}
.nav-link{
  display:flex;align-items:center;gap:14px;
  padding:14px 16px;border-radius:12px;
  font-size:15px;font-weight:500;color:#94a3b8;
  transition:var(--transition);position:relative;
}
.nav-link i{width:20px;text-align:center;font-size:16px}
.nav-link:hover{color:#fff;background:rgba(255,255,255,0.06);transform:translateX(4px)}
.nav-link.active{color:#fff;background:linear-gradient(135deg,rgba(37,99,235,0.25),rgba(6,182,212,0.15));border:1px solid rgba(37,99,235,0.3)}
.nav-link.active::before{content:"";position:absolute;left:-22px;top:50%;transform:translateY(-50%);width:3px;height:22px;border-radius:3px;background:linear-gradient(180deg,#2563eb,#06b6d4)}
.nav-badge{font-size:11px;background:var(--accent);color:#fff;padding:2px 8px;border-radius:20px;margin-left:auto;font-weight:600}
.side-footer-info{padding:18px 12px 0;border-top:1px solid rgba(255,255,255,0.08);font-size:12px;color:#64748b;line-height:1.6}
.main-area{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-width:0}
.mobile-topbar{
  display:none;align-items:center;justify-content:space-between;
  padding:16px 24px;background:var(--dark);position:sticky;top:0;z-index:999;
  box-shadow:0 4px 20px rgba(0,0,0,0.2);
}
.mobile-topbar .brand{margin:0}
.mobile-burger{width:42px;height:42px;border:none;border-radius:10px;background:rgba(255,255,255,0.08);color:#fff;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.mobile-burger:hover{background:rgba(255,255,255,0.16)}
.page-hero{
  position:relative;padding:96px 0 88px;overflow:hidden;
  background:linear-gradient(135deg,rgba(15,23,42,0.93),rgba(30,41,59,0.82)),url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  color:#fff;
}
.page-hero::after{content:"";position:absolute;bottom:-80px;right:-40px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,0.35),transparent 70%);pointer-events:none}
.hero-inner{position:relative;z-index:2}
.page-hero .tagline{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.2);backdrop-filter:blur(6px);padding:7px 18px;border-radius:40px;font-size:13px;letter-spacing:0.5px;margin-bottom:22px}
.hero-inner h1{font-size:42px;line-height:1.25;font-weight:800;letter-spacing:-0.5px;margin-bottom:16px}
.hero-inner p{font-size:17px;line-height:1.75;color:#cbd5e1;max-width:640px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 28px;border-radius:12px;font-weight:600;font-size:15px;border:none;cursor:pointer;transition:var(--transition);line-height:1.2}
.btn i{font-size:15px}
.btn-primary{background:linear-gradient(135deg,#2563eb,#06b6d4);color:#fff;box-shadow:0 8px 28px rgba(37,99,235,0.35)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 36px rgba(37,99,235,0.45)}
.btn-ghost{background:rgba(255,255,255,0.1);color:#fff;border:1px solid rgba(255,255,255,0.2);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,0.18);transform:translateY(-3px)}
.section-block{padding:88px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 60px}
.section-eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--primary);background:var(--primary-light);padding:6px 16px;border-radius:40px;margin-bottom:14px}
.section-head h2{font-size:34px;font-weight:800;letter-spacing:-0.3px;line-height:1.3;margin-bottom:12px;color:var(--dark)}
.section-head p{color:var(--muted);font-size:16px;line-height:1.7}
.status-strip{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:36px 40px;margin-top:-56px;position:relative;z-index:5;border:1px solid rgba(255,255,255,0.8)}
.status-grid{display:flex;flex-wrap:wrap;gap:28px;justify-content:space-between}
.status-item{display:flex;align-items:center;gap:16px;flex:1;min-width:180px}
.status-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.status-icon.green{background:var(--accent-light);color:var(--accent-dark)}
.status-icon.blue{background:var(--primary-light);color:var(--primary)}
.status-icon.orange{background:#fef3c7;color:#d97706}
.status-icon.purple{background:#ede9fe;color:#7c3aed}
.status-item .label{font-size:13px;color:var(--muted)}
.status-item .value{font-size:17px;font-weight:700;color:var(--dark)}
.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--accent);margin-right:6px;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(16,185,129,0.4)}50%{opacity:0.7;box-shadow:0 0 0 6px rgba(16,185,129,0)}}
.methods-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.method-card{
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);border:1px solid var(--border);
  transition:var(--transition);
}
.method-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.method-cover{height:200px;overflow:hidden;position:relative}
.method-cover img{width:100%;height:100%;object-fit:cover;transition:transform 0.6s ease}
.method-card:hover .method-cover img{transform:scale(1.06)}
.method-cover::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(15,23,42,0.25))}
.method-body{padding:30px 28px 34px}
.method-body h3{font-size:20px;font-weight:700;color:var(--dark);margin-bottom:10px}
.method-body p{font-size:14px;color:var(--muted);line-height:1.7;margin-bottom:18px}
.method-tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{display:inline-block;font-size:12px;font-weight:600;padding:4px 12px;border-radius:20px;background:#f1f5f9;color:var(--dark-2)}
.tag.blue{background:var(--primary-light);color:var(--primary-dark)}
.tag.green{background:var(--accent-light);color:var(--accent-dark)}
.steps-wrap{background:var(--dark);border-radius:24px;padding:64px;position:relative;overflow:hidden}
.steps-wrap::before{content:"";position:absolute;top:-120px;right:-80px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,0.3),transparent 70%)}
.steps-wrap::after{content:"";position:absolute;bottom:-100px;left:-60px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,rgba(16,185,129,0.18),transparent 70%)}
.steps-head{text-align:center;margin-bottom:54px;position:relative;z-index:2}
.steps-head h2{color:#fff;font-size:32px;font-weight:800}
.steps-head p{color:#94a3b8;font-size:15px;margin-top:8px}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;position:relative;z-index:2}
.step-item{text-align:left;padding:32px 24px;border-radius:16px;background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.08);transition:var(--transition)}
.step-item:hover{background:rgba(255,255,255,0.09);transform:translateY(-4px)}
.step-num{font-size:38px;font-weight:800;background:linear-gradient(135deg,#60a5fa,#2dd4bf);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;line-height:1.1;margin-bottom:14px}
.step-item h3{color:#fff;font-size:17px;margin-bottom:8px}
.step-item p{color:#94a3b8;font-size:13.5px;line-height:1.65}
.notice-wrap{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.notice-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);padding:36px}
.notice-card h3{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--dark);margin-bottom:20px}
.notice-card h3 i{color:var(--primary)}
.notice-list li{display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--border);font-size:14.5px;color:var(--dark-2);line-height:1.6}
.notice-list li:last-child{border-bottom:none}
.notice-list i{color:var(--accent);margin-top:3px;font-size:14px;width:16px;flex-shrink:0}
.faq-wrap{max-width:840px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:var(--primary-light)}
.faq-item.active{border-color:var(--primary-light);box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 26px;background:none;border:none;cursor:pointer;text-align:left;font-size:16px;font-weight:600;color:var(--dark);transition:var(--transition)}
.faq-q i{color:var(--primary);transition:transform 0.3s ease;flex-shrink:0}
.faq-item.active .faq-q i{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 0.4s ease;padding:0 26px;color:var(--muted);font-size:14.5px;line-height:1.75}
.faq-item.active .faq-a{max-height:300px;padding-bottom:24px}
.cta-section{background:linear-gradient(135deg,#1e40af 0%,#0f172a 60%);border-radius:24px;padding:60px;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:"";position:absolute;top:-60px;left:-80px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,0.4),transparent 70%)}
.cta-section h2{color:#fff;font-size:30px;font-weight:800;margin-bottom:14px;position:relative;z-index:2}
.cta-section p{color:#cbd5e1;font-size:16px;margin-bottom:28px;position:relative;z-index:2;max-width:520px;margin-left:auto;margin-right:auto}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative;z-index:2}
.site-footer{background:var(--dark);color:#94a3b8;padding:64px 0 24px;margin-top:auto}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.2fr;gap:44px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.06)}
.footer-brand .brand{margin-bottom:16px;padding:0}
.footer-brand p{font-size:13.5px;line-height:1.8;color:#64748b}
.footer-col h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:18px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:13.5px;color:#94a3b8;display:inline-flex;align-items:center;gap:8px;transition:var(--transition)}
.footer-col ul a:hover{color:#fff;padding-left:4px}
.footer-col ul a i{font-size:10px;color:var(--primary)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:28px;font-size:13px;color:#64748b}
.footer-bottom a{color:#8496b4}
.footer-bottom a:hover{color:#fff}
.mobile-menu-mask{display:none;position:fixed;inset:0;background:rgba(15,23,42,0.5);z-index:998;backdrop-filter:blur(2px)}
@media (min-width:1025px){
  .mobile-topbar{display:none!important}
  .mobile-menu-mask{display:none!important}
}
@media (max-width:1024px){
  .side-nav{transform:translateX(-100%)}
  .side-nav.open{transform:translateX(0);box-shadow:24px 0 64px rgba(0,0,0,0.3)}
  .main-area{margin-left:0}
  .mobile-topbar{display:flex}
  .mobile-menu-mask.show{display:block}
  .page-hero{padding:72px 0 80px}
  .section-block{padding:72px 0}
  .methods-grid{grid-template-columns:repeat(2,1fr)}
  .steps-grid{grid-template-columns:repeat(2,1fr);gap:20px}
  .notice-wrap{grid-template-columns:1fr}
  .status-grid{gap:20px}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .page-hero{padding:60px 0 72px}
  .hero-inner h1{font-size:30px}
  .hero-inner p{font-size:15px}
  .hero-actions .btn{padding:12px 22px;font-size:14px}
  .status-strip{margin-top:-36px;padding:24px}
  .section-head h2{font-size:26px}
  .section-block{padding:60px 0}
  .methods-grid{grid-template-columns:1fr}
  .steps-wrap{padding:40px 24px}
  .steps-grid{grid-template-columns:1fr;gap:16px}
  .step-num{font-size:32px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;text-align:center}
  .cta-section{padding:44px 24px}
  .cta-section h2{font-size:24px}
  .notice-card{padding:28px}
  .faq-q{padding:18px 20px;font-size:15px}
  .faq-a{padding:0 20px}
  .hero-actions{flex-direction:column;width:100%}
  .hero-actions .btn{width:100%;justify-content:center}
  .status-grid{grid-template-columns:1fr 1fr}
  .status-item{min-width:0}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .mobile-topbar{padding:12px 16px}
  .page-hero{padding:48px 0 60px}
  .hero-inner h1{font-size:25px}
  .section-head{margin-bottom:40px}
  .status-grid{grid-template-columns:1fr}
  .status-item{padding:10px 0}
  .step-item{padding:24px 18px}
  .footer-bottom{flex-direction:column;text-align:center;font-size:12px}
}

/* roulang page: category2 */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #eff6ff;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
  --transition: 0.25s ease;
  --container: 1200px;
  --sidebar-w: 260px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: 1rem; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ===== Layout Shell ===== */
.shell { display: flex; min-height: 100vh; }

/* ===== Sidebar Nav ===== */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-dark);
  color: rgba(255,255,255,0.85);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; bottom: 0; left: 0;
  z-index: 100;
  border-right: 1px solid rgba(255,255,255,0.08);
}
.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 28px 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 40px; height: 40px;
  background: var(--primary);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: #fff;
  box-shadow: 0 4px 12px rgba(37,99,235,0.4);
}
.brand-text {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.5px;
  line-height: 1.3;
}
.side-nav { padding: 12px 16px; flex: 1; }
.side-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-radius: 10px;
  color: rgba(255,255,255,0.72);
  font-size: 14.5px;
  font-weight: 500;
  margin-bottom: 4px;
  transition: all var(--transition);
}
.side-nav .nav-link i { width: 18px; text-align: center; font-size: 15px; }
.side-nav .nav-link:hover { background: rgba(255,255,255,0.08); color: #fff; }
.side-nav .nav-link.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}
.sidebar-bottom {
  padding: 20px 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.sidebar-bottom .support-card {
  background: rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}
.sidebar-bottom .support-card strong { display: block; color: #fff; font-size: 14px; margin-bottom: 4px; }
.sidebar-bottom .support-card span { font-size: 12.5px; color: rgba(255,255,255,0.6); line-height: 1.5; display: block; }

/* ===== Mobile Top Bar ===== */
.mobile-topbar {
  display: none;
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-width: 0;
}

/* ===== Page Hero / Banner ===== */
.page-hero {
  position: relative;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 55%, #2563eb 100%);
  padding: 72px 0 64px;
  color: #fff;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -40%; right: -10%;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(37,99,235,0.4) 0%, transparent 60%);
  pointer-events: none;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: -60px; left: 20%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(245,158,11,0.2) 0%, transparent 60%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 2; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 20px;
}
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { opacity: 0.5; }
.page-hero h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.25;
  letter-spacing: -0.5px;
}
.page-hero p {
  font-size: 16.5px;
  max-width: 640px;
  color: rgba(255,255,255,0.82);
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 42px;
  margin-top: 38px;
  flex-wrap: wrap;
}
.hero-stat span {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 2px;
}
.hero-stat strong {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

/* ===== Section Common ===== */
.section { padding: 72px 0; }
.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 44px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 40px;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}
.section-head h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.section-head p {
  font-size: 15.5px;
  color: var(--text-light);
  line-height: 1.8;
}
.text-left { text-align: left; margin-left: 0; }

/* ===== Security Overview Cards ===== */
.sec-overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.sec-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 28px 24px;
  transition: all var(--transition);
}
.sec-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.sec-card .icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 18px;
}
.sec-card .icon.blue { background: var(--primary-light); color: var(--primary); }
.sec-card .icon.green { background: #ecfdf5; color: var(--success); }
.sec-card .icon.amber { background: var(--accent-light); color: var(--accent); }
.sec-card .icon.red { background: #fef2f2; color: var(--danger); }
.sec-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.sec-card p { font-size: 13.5px; color: var(--text-light); line-height: 1.7; }

/* ===== Safety Measures Feature ===== */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.feature-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.feature-img img { width: 100%; height: 380px; object-fit: cover; }
.feature-content h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 14px;
  line-height: 1.35;
}
.feature-content > p {
  color: var(--text-light);
  font-size: 15px;
  line-height: 1.85;
  margin-bottom: 28px;
}
.measure-list { display: flex; flex-direction: column; gap: 16px; }
.measure-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 18px;
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: border-color var(--transition);
}
.measure-item:hover { border-color: var(--primary); }
.measure-item .check {
  width: 26px; height: 26px;
  min-width: 26px;
  background: #ecfdf5;
  color: var(--success);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px;
  margin-top: 2px;
}
.measure-item h4 { font-size: 15px; font-weight: 600; margin-bottom: 3px; }
.measure-item p { font-size: 13px; color: var(--text-light); line-height: 1.6; }

/* ===== Steps / Process ===== */
.steps-section {
  background: var(--bg-white);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.step-item {
  position: relative;
  padding: 24px 20px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border-light);
  text-align: center;
  transition: all var(--transition);
}
.step-item:hover { box-shadow: var(--shadow); transform: translateY(-3px); background: var(--bg-white); }
.step-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.18;
  line-height: 1;
  margin-bottom: 10px;
}
.step-item h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.step-item p { font-size: 13.5px; color: var(--text-light); line-height: 1.7; }

/* ===== FAQ ===== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.faq-item summary {
  padding: 20px 24px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  list-style: none;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: '\f059';
  font-family: 'Font Awesome 6 Free';
  font-weight: 400;
  color: var(--primary);
  font-size: 18px;
}
.faq-item summary::after {
  content: '\f078';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  margin-left: auto;
  font-size: 14px;
  color: var(--text-muted);
  transition: transform var(--transition);
}
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item[open] { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.faq-answer { padding: 0 24px 20px 54px; font-size: 14px; color: var(--text-light); line-height: 1.85; }

/* ===== Security Alert / Notice ===== */
.alert-block {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 50%, #f59e0b 100%);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
}
.alert-block .alert-icon {
  width: 64px; height: 64px;
  min-width: 64px;
  background: rgba(255,255,255,0.85);
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  color: var(--accent);
  box-shadow: var(--shadow);
}
.alert-block h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: #78350f; }
.alert-block p { font-size: 14px; color: #92400e; line-height: 1.7; max-width: 720px; }

/* ===== CTA ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  color: #fff;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -40px; left: -40px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
}
.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -60px; right: -20px;
  width: 240px; height: 240px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.cta-banner h2 { font-size: 28px; font-weight: 700; margin-bottom: 12px; position: relative; z-index: 1; }
.cta-banner p { font-size: 15px; color: rgba(255,255,255,0.85); margin-bottom: 26px; position: relative; z-index: 1; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 14.5px;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.btn-primary { background: #fff; color: var(--primary); }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.btn-ghost { background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-ghost:hover { background: rgba(255,255,255,0.25); transform: translateY(-2px); }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 56px 0 0;
  margin-left: var(--sidebar-w);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .brand {
  margin-bottom: 14px;
}
.footer-brand .brand-text { font-size: 16px; }
.footer-brand p { font-size: 13.5px; line-height: 1.8; color: rgba(255,255,255,0.55); max-width: 320px; }
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 13.5px;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition), padding-left var(--transition);
}
.footer-col ul a:hover { color: #fff; padding-left: 4px; }
.footer-col ul a i { font-size: 10px; margin-right: 6px; color: var(--primary); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: #fff; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root { --sidebar-w: 220px; }
  .hero-stats { gap: 24px; }
  .sec-overview-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-split { grid-template-columns: 1fr; gap: 32px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { margin-left: 0; }
  .site-footer { margin-left: 0; }
  .mobile-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--bg-dark);
    position: sticky;
    top: 0;
    z-index: 99;
  }
  .mobile-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
  }
  .mobile-brand .brand-mark {
    width: 32px; height: 32px;
    font-size: 14px;
    border-radius: 8px;
  }
  .mobile-menu-btn {
    color: #fff;
    font-size: 20px;
    padding: 6px 10px;
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
  }
  .mobile-menu-btn:hover { background: rgba(255,255,255,0.2); }
  .mobile-nav {
    display: none;
    background: var(--bg-dark);
    padding: 0 20px 20px;
  }
  .mobile-nav.show { display: block; }
  .mobile-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    color: rgba(255,255,255,0.75);
    border-radius: 10px;
    font-size: 14.5px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .mobile-nav .nav-link.active { background: var(--primary); color: #fff; }
  .page-hero { padding: 48px 0 40px; }
  .page-hero h1 { font-size: 26px; }
  .section { padding: 48px 0; }
  .section-head h2 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .alert-block { padding: 28px 24px; flex-direction: column; text-align: center; }
  .cta-banner { padding: 40px 24px; }
  .cta-banner h2 { font-size: 22px; }
  .step-item { padding: 18px 14px; }
}

@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .sec-overview-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .hero-stat strong { font-size: 22px; }
  .feature-img img { height: 240px; }
  .faq-item summary { padding: 16px 16px; font-size: 14.5px; flex-wrap: wrap; }
  .faq-answer { padding: 0 16px 16px 46px; }
  .cta-buttons .btn { width: 100%; justify-content: center; }
}

/* roulang page: article */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #dbeafe;
  --color-primary-lighter: #eff6ff;
  --color-accent: #f59e0b;
  --color-accent-light: #fef3c7;
  --color-surface: #ffffff;
  --color-bg: #f1f5f9;
  --color-bg-light: #f8fafc;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-dark: #0f172a;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
  --shadow-primary: 0 4px 14px rgba(37, 99, 235, 0.25);
  --space-section: 80px;
  --nav-width: 260px;
}
*, *::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", "Helvetica Neue", Arial, sans-serif; line-height: 1.7; color: var(--color-text); background: var(--color-bg); min-height: 100vh; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
ul, ol { list-style: none; }
button { font-family: inherit; font-size: inherit; cursor: pointer; background: none; border: none; color: inherit; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--color-dark); font-weight: 700; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }
.layout { display: flex; min-height: 100vh; }

/* ===== 品牌与左侧导航 ===== */
.side-nav {
  width: var(--nav-width); position: fixed; top: 0; left: 0; bottom: 0;
  background: var(--color-surface); border-right: 1px solid var(--color-border);
  display: flex; flex-direction: column; padding: 28px 20px; z-index: 200;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.brand { display: flex; align-items: center; gap: 12px; padding: 6px 4px; margin-bottom: 28px; }
.brand-mark { width: 44px; height: 44px; border-radius: 13px; background: linear-gradient(135deg, #1e40af, #60a5fa); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; box-shadow: var(--shadow-primary); flex-shrink: 0; }
.brand-text { font-size: 16px; font-weight: 700; color: var(--color-dark); line-height: 1.3; letter-spacing: 0.01em; }
.nav-section { flex: 0 0 auto; margin-bottom: 20px; }
.nav-section-title { font-size: 12px; color: var(--color-text-muted); letter-spacing: 0.08em; padding: 0 12px; margin-bottom: 10px; font-weight: 600; text-transform: uppercase; }
.nav-link { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: var(--radius-sm); color: var(--color-text-light); font-size: 14px; font-weight: 500; transition: all 0.2s ease; margin-bottom: 4px; }
.nav-link i { width: 20px; text-align: center; font-size: 15px; }
.nav-link:hover { background: var(--color-primary-light); color: var(--color-primary); }
.nav-link.active { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-primary); }
.nav-callout { margin-top: auto; background: var(--color-primary-lighter); border: 1px solid var(--color-primary-light); border-radius: var(--radius-md); padding: 18px; }
.nav-callout i { color: var(--color-primary); font-size: 22px; margin-bottom: 8px; display: inline-block; }
.nav-callout h4 { font-size: 14px; color: var(--color-primary-dark); margin-bottom: 4px; }
.nav-callout p { font-size: 12px; color: var(--color-text-light); line-height: 1.5; margin-bottom: 10px; }
.nav-callout a { display: inline-block; font-size: 12px; font-weight: 600; color: var(--color-primary); }
.nav-callout a:hover { color: var(--color-primary-dark); }

/* ===== 移动端顶部 ===== */
.mobile-header { display: none; align-items: center; justify-content: space-between; padding: 14px 20px; background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 300; }
.mobile-header .brand { margin-bottom: 0; }
.mobile-toggle { width: 42px; height: 42px; border-radius: 10px; background: var(--color-primary-lighter); display: flex; align-items: center; justify-content: center; font-size: 18px; color: var(--color-primary); transition: background 0.2s; }
.mobile-toggle:hover { background: var(--color-primary-light); }
.nav-overlay { display: none; position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5); z-index: 199; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.nav-overlay.show { opacity: 1; pointer-events: auto; }

/* ===== 主内容区 ===== */
.main-content { flex: 1; margin-left: var(--nav-width); min-width: 0; display: flex; flex-direction: column; }

/* ===== 文章Banner ===== */
.article-banner {
  position: relative; background: url('/assets/images/backpic/back-1.png') center / cover no-repeat;
  padding: 64px 0 56px; color: #fff; overflow: hidden;
}
.article-banner::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15, 23, 42, 0.85), rgba(37, 99, 235, 0.65)); }
.article-banner .container { position: relative; z-index: 1; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,0.75); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a { color: rgba(255,255,255,0.85); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .separator { opacity: 0.5; }
.article-h1 { font-size: 32px; font-weight: 800; color: #fff; line-height: 1.35; margin-bottom: 18px; letter-spacing: 0.01em; }
.article-meta { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; font-size: 14px; color: rgba(255,255,255,0.8); }
.article-meta i { margin-right: 5px; }

/* ===== 徽章/标签 ===== */
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 14px; border-radius: 100px; font-size: 13px; font-weight: 600; line-height: 1.6; }
.badge-primary { background: var(--color-primary); color: #fff; }
.badge-accent { background: var(--color-accent); color: #fff; }
.badge-light { background: rgba(255,255,255,0.18); color: #fff; border: 1px solid rgba(255,255,255,0.25); }
.tag { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; background: var(--color-primary-lighter); border: 1px solid var(--color-primary-light); border-radius: 100px; font-size: 13px; color: var(--color-primary); font-weight: 500; }

/* ===== 文章主体 ===== */
.article-wrapper { padding: 48px 0 64px; }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: start; }
.article-main { min-width: 0; }
.article-body { background: var(--color-surface); border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); }
.article-body h2 { font-size: 24px; margin: 32px 0 16px; color: var(--color-dark); padding-bottom: 8px; border-bottom: 2px solid var(--color-primary-light); }
.article-body h3 { font-size: 19px; margin: 26px 0 12px; color: var(--color-dark); }
.article-body h4 { font-size: 17px; margin: 20px 0 10px; }
.article-body p { margin-bottom: 18px; color: #334155; font-size: 16px; line-height: 1.9; }
.article-body ul, .article-body ol { margin: 0 0 18px 22px; color: #334155; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 8px; line-height: 1.8; }
.article-body ul li::marker { color: var(--color-primary); }
.article-body img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-sm); }
.article-body blockquote { border-left: 4px solid var(--color-primary); background: var(--color-primary-lighter); padding: 16px 22px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 24px 0; color: var(--color-text-light); }
.article-body blockquote p { margin-bottom: 0; }
.article-body a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { color: var(--color-primary-dark); }
.article-body table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; }
.article-body th, .article-body td { border: 1px solid var(--color-border); padding: 12px 14px; text-align: left; }
.article-body th { background: var(--color-primary-lighter); font-weight: 600; color: var(--color-dark); }
.article-body code { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 4px; padding: 2px 6px; font-size: 14px; font-family: "SFMono-Regular", Consolas, monospace; }

/* ===== 文章标签与分享 ===== */
.article-tags-share { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--color-border); }
.article-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.article-share { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--color-text-light); }
.article-share a { width: 36px; height: 36px; border-radius: 50%; background: var(--color-bg); display: flex; align-items: center; justify-content: center; font-size: 15px; color: var(--color-text-light); transition: all 0.2s; }
.article-share a:hover { background: var(--color-primary); color: #fff; transform: translateY(-2px); }

/* ===== 侧边栏 ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 24px; position: sticky; top: 24px; }
.sidebar-card { background: var(--color-surface); border-radius: var(--radius-md); padding: 24px; box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); }
.sidebar-card h3 { font-size: 16px; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--color-primary-light); display: flex; align-items: center; gap: 8px; color: var(--color-dark); }
.sidebar-card h3 i { color: var(--color-primary); font-size: 15px; }
.category-list li { margin-bottom: 2px; }
.category-list a { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); font-size: 14px; color: var(--color-text-light); transition: all 0.2s; }
.category-list a i { font-size: 12px; color: var(--color-text-muted); transition: all 0.2s; }
.category-list a:hover { background: var(--color-primary-lighter); color: var(--color-primary); }
.category-list a:hover i { color: var(--color-primary); transform: translateX(2px); }
.latest-list li { padding: 10px 0; border-bottom: 1px solid var(--color-bg); }
.latest-list li:last-child { border-bottom: none; padding-bottom: 0; }
.latest-list a { display: block; }
.latest-title { display: block; font-size: 14px; color: var(--color-text); font-weight: 500; line-height: 1.4; margin-bottom: 3px; transition: color 0.2s; }
.latest-list a:hover .latest-title { color: var(--color-primary); }
.latest-date { font-size: 12px; color: var(--color-text-muted); }
.sidebar-alert { background: var(--color-accent-light); border-color: #fde68a; }
.sidebar-alert h3 { border-bottom-color: #fde68a; color: #92400e; }
.sidebar-alert h3 i { color: var(--color-accent); }
.sidebar-alert p { font-size: 13px; color: #78350f; line-height: 1.7; }
.empty-text { padding: 16px 0; color: var(--color-text-muted); font-size: 14px; text-align: center; }

/* ===== 空状态 ===== */
.not-found-panel { background: var(--color-surface); border-radius: var(--radius-lg); padding: 64px 32px; text-align: center; box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); }
.not-found-panel i { font-size: 56px; color: var(--color-text-muted); margin-bottom: 16px; display: block; }
.not-found-panel h2 { font-size: 26px; margin-bottom: 10px; color: var(--color-dark); }
.not-found-panel p { color: var(--color-text-light); margin-bottom: 24px; }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 26px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; transition: all 0.25s ease; box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08); }
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-primary); }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35); }
.btn-light { background: #fff; color: var(--color-primary); }
.btn-light:hover { background: var(--color-primary-lighter); transform: translateY(-2px); }
.btn-outline-light { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.5); box-shadow: none; }
.btn-outline-light:hover { background: rgba(255,255,255,0.12); border-color: #fff; transform: translateY(-2px); }
.btn:focus-visible { outline: 3px solid var(--color-primary-light); outline-offset: 2px; }

/* ===== 相关推荐 ===== */
.recommend-section { padding: 64px 0; background: var(--color-bg-light); border-top: 1px solid var(--color-border); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 28px; margin-bottom: 6px; }
.section-head p { color: var(--color-text-light); font-size: 15px; }
.recommend-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.recommend-card { background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); transition: all 0.3s ease; display: flex; flex-direction: column; }
.recommend-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--color-primary-light); }
.recommend-card .cover { width: 100%; height: 150px; object-fit: cover; }
.recommend-body { padding: 16px 18px 18px; flex: 1; display: flex; flex-direction: column; }
.recommend-body .tag { align-self: flex-start; margin-bottom: 10px; }
.recommend-body h3 { font-size: 15px; line-height: 1.45; margin-bottom: 8px; transition: color 0.2s; }
.recommend-card:hover .recommend-body h3 { color: var(--color-primary); }
.recommend-body p { font-size: 13px; color: var(--color-text-light); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 10px; }
.recommend-body .date { font-size: 12px; color: var(--color-text-muted); margin-top: auto; }

/* ===== FAQ ===== */
.faq-section { padding: 64px 0; }
.faq-list { max-width: 900px; margin: 0 auto; }
.faq-item { background: var(--color-surface); border-radius: var(--radius-md); margin-bottom: 12px; box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); overflow: hidden; }
.faq-item summary { padding: 18px 22px; font-weight: 600; font-size: 15px; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; transition: background 0.2s; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--color-primary-lighter); }
.faq-item summary .faq-icon { color: var(--color-primary); font-size: 14px; transition: transform 0.3s; flex-shrink: 0; }
.faq-item[open] summary .faq-icon { transform: rotate(180deg); }
.faq-item .faq-answer { padding: 0 22px 18px; color: var(--color-text-light); font-size: 14px; line-height: 1.75; border-top: 1px solid var(--color-bg); padding-top: 14px; margin-top: 4px; }

/* ===== CTA ===== */
.cta-section { padding: 64px 0 80px; }
.cta-inner { background: linear-gradient(135deg, #1e40af, #2563eb); border-radius: var(--radius-lg); padding: 48px 52px; display: flex; align-items: center; justify-content: space-between; gap: 32px; color: #fff; box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
.cta-inner::after { content: ''; position: absolute; width: 260px; height: 260px; border-radius: 50%; background: rgba(255,255,255,0.06); top: -90px; right: -60px; }
.cta-content h2 { font-size: 24px; color: #fff; margin-bottom: 8px; }
.cta-content p { color: rgba(255,255,255,0.8); font-size: 15px; }
.cta-actions { display: flex; gap: 14px; flex-shrink: 0; position: relative; z-index: 1; }

/* ===== 页脚 ===== */
.site-footer { margin-top: auto; background: var(--color-dark); color: rgba(255,255,255,0.65); padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand .brand-text { color: #fff; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 380px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-col h4::after { content: ''; position: absolute; left: 0; bottom: 0; width: 24px; height: 3px; border-radius: 2px; background: var(--color-primary); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.65); display: inline-flex; align-items: center; gap: 6px; transition: all 0.2s; }
.footer-col ul a i { font-size: 10px; color: var(--color-primary); }
.footer-col ul a:hover { color: #fff; padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 18px 0 20px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: rgba(255,255,255,0.45); }
.footer-bottom a { color: rgba(255,255,255,0.65); }
.footer-bottom a:hover { color: #fff; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .recommend-grid { grid-template-columns: repeat(2, 1fr); }
  .article-grid { grid-template-columns: minmax(0, 1fr) 280px; gap: 24px; }
  .cta-inner { flex-direction: column; text-align: center; padding: 36px 28px; }
  .cta-actions { justify-content: center; }
}
@media (max-width: 768px) {
  :root { --nav-width: 0px; }
  .mobile-header { display: flex; }
  .side-nav { transform: translateX(-100%); width: 280px; box-shadow: var(--shadow-lg); }
  .side-nav.open { transform: translateX(0); }
  .nav-overlay.show { display: block; }
  .main-content { margin-left: 0; }
  .article-banner { padding: 44px 0 40px; }
  .article-h1 { font-size: 24px; }
  .article-wrapper { padding: 32px 0 48px; }
  .article-grid { grid-template-columns: 1fr; }
  .article-sidebar { position: static; gap: 20px; }
  .article-body { padding: 28px 20px; }
  .article-body h2 { font-size: 20px; }
  .article-body p { font-size: 15px; }
  .article-tags-share { flex-direction: column; align-items: flex-start; }
  .recommend-section { padding: 48px 0; }
  .recommend-grid { grid-template-columns: 1fr 1fr; }
  .faq-section { padding: 48px 0; }
  .cta-section { padding: 48px 0 56px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
  .section-head h2 { font-size: 23px; }
}
@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .article-banner { padding: 36px 0 32px; }
  .article-meta { gap: 10px; font-size: 13px; }
  .recommend-grid { grid-template-columns: 1fr; }
  .recommend-card .cover { height: 170px; }
  .cta-inner { padding: 28px 20px; }
  .cta-actions { flex-direction: column; width: 100%; }
  .cta-actions .btn { justify-content: center; width: 100%; }
  .article-body { padding: 22px 16px; }
  .article-h1 { font-size: 21px; }
  .faq-item summary { font-size: 14px; padding: 15px 18px; }
  .faq-item .faq-answer { font-size: 13px; padding-left: 18px; padding-right: 18px; }
}

/* roulang page: category3 */
:root {
  --primary: #1e4ae0;
  --primary-dark: #1536a8;
  --primary-light: #e8edff;
  --accent: #00c9a7;
  --accent-light: #d6f7f0;
  --bg: #f4f6fb;
  --bg-deep: #0d1b2a;
  --card-bg: #ffffff;
  --text: #1a2233;
  --text-weak: #6b7a8f;
  --border: #e3e9f2;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow: 0 8px 30px rgba(26, 34, 51, 0.08);
  --shadow-lg: 0 20px 50px rgba(26, 34, 51, 0.16);
  --transition: all 0.3s ease;
}

*, *::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", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

button, input {
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.site-wrapper {
  min-height: 100vh;
}

/* ========== 左侧竖向导航 ========== */
.side-nav {
  position: fixed;
  left: 0;
  top: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-deep);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 28px 20px;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.side-nav .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: #fff;
}

.brand-mark {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), #4f7cff);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(30, 74, 224, 0.45);
}

.brand-text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1.3;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  margin-left: auto;
  padding: 6px 10px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

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

.nav-links {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid transparent;
}

.nav-link i {
  width: 20px;
  text-align: center;
  font-size: 17px;
  flex-shrink: 0;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  transform: translateX(4px);
}

.nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #3561ff);
  box-shadow: 0 6px 18px rgba(30, 74, 224, 0.4);
  transform: translateX(4px);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ========== 右侧主内容区 ========== */
.main-wrapper {
  margin-left: 280px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
}

/* ========== Hero / Banner ========== */
.page-banner {
  position: relative;
  background-size: cover;
  background-position: center;
  padding: 120px 0 100px;
  color: #fff;
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(13, 27, 42, 0.86) 20%, rgba(13, 27, 42, 0.4) 70%);
}

.page-banner .container {
  position: relative;
  z-index: 1;
}

.banner-inner {
  max-width: 720px;
}

.badge {
  display: inline-block;
  background: rgba(0, 201, 167, 0.2);
  border: 1px solid rgba(0, 201, 167, 0.5);
  color: #4df0cd;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 50px;
  letter-spacing: 1px;
  margin-bottom: 22px;
  backdrop-filter: blur(4px);
}

.banner-inner h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.banner-inner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.82);
  max-width: 580px;
  margin-bottom: 30px;
  line-height: 1.8;
}

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

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1.4;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 18px rgba(30, 74, 224, 0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30, 74, 224, 0.45);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(4px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
}

.btn-light {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-light:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

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

/* ========== 通用板块 ========== */
.section {
  padding: 90px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 20px;
  border-radius: 50px;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-head h2 {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
  color: var(--text);
}

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

/* ========== 安全防护卡片 ========== */
.safe-cards {
  padding-top: -10px;
  margin-top: -20px;
  position: relative;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card-safety {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card-safety::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 90px;
  height: 90px;
  background: var(--primary-light);
  border-radius: 50%;
  opacity: 0.5;
  transition: var(--transition);
}

.card-safety:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(30, 74, 224, 0.3);
}

.card-safety:hover::after {
  transform: scale(1.6);
  opacity: 0.2;
}

.card-icon {
  width: 58px;
  height: 58px;
  background: linear-gradient(135deg, var(--primary), #4f7cff);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #fff;
  margin-bottom: 22px;
  box-shadow: 0 6px 18px rgba(30, 74, 224, 0.3);
  position: relative;
  z-index: 1;
}

.card-safety:nth-child(2) .card-icon {
  background: linear-gradient(135deg, #00c9a7, #00e0bd);
  box-shadow: 0 6px 18px rgba(0, 201, 167, 0.35);
}

.card-safety:nth-child(3) .card-icon {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  box-shadow: 0 6px 18px rgba(245, 158, 11, 0.3);
}

.card-safety:nth-child(4) .card-icon {
  background: linear-gradient(135deg, #8b5cf6, #a78bfa);
  box-shadow: 0 6px 18px rgba(139, 92, 246, 0.3);
}

.card-safety h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.card-safety p {
  color: var(--text-weak);
  font-size: 14px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

/* ========== 图文建议区块 ========== */
.tips-section {
  background: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.tip-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.tip-block:last-child {
  margin-bottom: 0;
}

.tip-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  line-height: 0;
  position: relative;
}

.tip-img::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(13, 27, 42, 0.25));
  z-index: 1;
}

.tip-img img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

.tip-content h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text);
}

.tip-content > p {
  color: var(--text-weak);
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 22px;
}

.tip-content ul {
  display: grid;
  gap: 12px;
}

.tip-content ul li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
}

.tip-content ul li i {
  color: var(--accent);
  margin-top: 3px;
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: var(--accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
}

.tip-block.reverse .tip-img {
  order: 2;
}

.tip-block.reverse .tip-content {
  order: 1;
}

/* ========== 统计区 ========== */
.stats-section {
  background: var(--bg-deep);
  padding: 80px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}

.stat-item {
  position: relative;
  padding: 20px 10px;
}

.stat-item::after {
  content: "";
  position: absolute;
  right: -20px;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255, 255, 255, 0.12);
}

.stat-item:last-child::after {
  display: none;
}

.stat-num {
  font-size: 44px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  background: linear-gradient(135deg, #4f7cff, #00e0bd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.stat-item p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
  letter-spacing: 0.5px;
}

/* ========== FAQ ========== */
.faq-section {
  background: #fff;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(30, 74, 224, 0.3);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.faq-q {
  width: 100%;
  background: none;
  border: none;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.faq-q i {
  color: var(--text-weak);
  transition: var(--transition);
  flex-shrink: 0;
}

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

.faq-item.active .faq-q i {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-a p {
  padding: 0 24px 22px;
  color: var(--text-weak);
  font-size: 15px;
  line-height: 1.9;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

/* ========== 安全流程 ========== */
.process-section {
  background: var(--bg);
}

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

.step {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 34px 26px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: relative;
  transition: var(--transition);
}

.step:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.step-num {
  font-size: 15px;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-light);
  display: inline-block;
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 18px;
}

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

.step p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
}

/* ========== CTA ========== */
.cta-section {
  padding: 90px 0;
}

.cta-inner {
  background: linear-gradient(135deg, var(--bg-deep) 0%, #1a2d47 100%);
  border-radius: var(--radius-lg);
  padding: 64px 50px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  background: rgba(30, 74, 224, 0.3);
  border-radius: 50%;
  top: -120px;
  right: -80px;
}

.cta-inner::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  background: rgba(0, 201, 167, 0.2);
  border-radius: 50%;
  bottom: -70px;
  left: -40px;
}

.cta-inner h2 {
  font-size: 30px;
  font-weight: 800;
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}

.cta-inner p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 28px;
  position: relative;
  z-index: 1;
}

.cta-inner .btn {
  position: relative;
  z-index: 1;
  margin: 0 6px;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.72);
  padding: 72px 0 32px;
}

.site-footer .container {
  max-width: 1200px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.6);
  max-width: 360px;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-col ul {
  display: grid;
  gap: 12px;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.62);
  font-size: 14px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-col ul li a i {
  font-size: 10px;
  opacity: 0.6;
}

.footer-col ul li a:hover {
  color: #fff;
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 28px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .side-nav {
    width: 84px;
    padding: 24px 14px;
  }
  .brand {
    justify-content: center;
    padding: 8px 0 16px;
  }
  .brand-text {
    display: none;
  }
  .nav-link {
    justify-content: center;
    padding: 14px 8px;
  }
  .nav-link span {
    display: none;
  }
  .nav-link i {
    font-size: 19px;
  }
  .nav-link:hover {
    transform: none;
  }
  .nav-link.active {
    transform: none;
  }
  .main-wrapper {
    margin-left: 84px;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .tip-block {
    gap: 36px;
  }
  .stats-grid {
    gap: 20px;
  }
}

@media (max-width: 767px) {
  .side-nav {
    position: sticky;
    top: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 12px 16px;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    overflow: visible;
  }
  .side-nav .brand {
    padding: 0;
    border-bottom: none;
  }
  .brand-text {
    display: inline-block;
    font-size: 15px;
  }
  .nav-toggle {
    display: block;
  }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-deep);
    flex-direction: column;
    padding: 10px 16px 20px;
    margin: 0;
    display: none;
    box-shadow: 0 25px 40px rgba(0, 0, 0, 0.3);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-link {
    justify-content: flex-start;
    padding: 13px 16px;
  }
  .nav-link span {
    display: inline;
  }
  .nav-link i {
    font-size: 17px;
  }
  .main-wrapper {
    margin-left: 0;
  }
  .container {
    padding: 0 20px;
  }
  .page-banner {
    padding: 80px 0 70px;
  }
  .banner-inner h1 {
    font-size: 30px;
  }
  .banner-inner p {
    font-size: 15px;
  }
  .section {
    padding: 60px 0;
  }
  .section-head h2 {
    font-size: 26px;
  }
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .tip-block,
  .tip-block.reverse {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .tip-block.reverse .tip-img {
    order: 1;
  }
  .tip-block.reverse .tip-content {
    order: 2;
  }
  .tip-img img {
    height: 240px;
  }
  .tip-content h3 {
    font-size: 22px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item::after {
    display: none;
  }
  .stat-num {
    font-size: 32px;
  }
  .process-steps {
    grid-template-columns: 1fr;
    max-width: 460px;
    margin: 0 auto;
  }
  .cta-inner {
    padding: 44px 24px;
  }
  .cta-inner h2 {
    font-size: 24px;
  }
  .cta-inner .btn {
    display: block;
    width: 100%;
    margin: 10px 0;
    text-align: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .banner-inner h1 {
    font-size: 26px;
  }
  .banner-actions {
    flex-direction: column;
    width: 100%;
  }
  .banner-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .section-head h2 {
    font-size: 23px;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .stat-num {
    font-size: 28px;
  }
  .footer-bottom {
    text-align: center;
    align-items: center;
  }
  .tip-content ul li {
    font-size: 14px;
  }
  .faq-q {
    font-size: 14px;
    padding: 18px 16px;
  }
  .faq-a p {
    padding: 16px;
    font-size: 14px;
  }
}

/* 可访问性 */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}