/* roulang page: index */
:root {
  --primary: #0b0f2a;
  --primary-light: #1a2151;
  --primary-dark: #060816;
  --accent: #e8a33d;
  --accent-dark: #d18f2e;
  --accent-light: #f5c06d;
  --bg: #f4f6fb;
  --bg-white: #ffffff;
  --text: #1a1f36;
  --text-light: #5f6a85;
  --text-muted: #8a94ad;
  --border: #e5eaf2;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(11, 15, 42, 0.06);
  --shadow: 0 10px 30px rgba(11, 15, 42, 0.1);
  --shadow-lg: 0 20px 50px rgba(11, 15, 42, 0.14);
  --nav-width: 260px;
  --transition: all 0.3s ease;
}
*, *::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;
  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: var(--transition); }
button { font-family: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5 { line-height: 1.3; font-weight: 700; }

.app-layout { display: flex; min-height: 100vh; }
.main-content { flex: 1; margin-left: var(--nav-width); min-width: 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* ===== Sidebar ===== */
.sidebar {
  width: var(--nav-width);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  background: linear-gradient(180deg, #0d1230 0%, #080b1f 100%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 24px rgba(6, 8, 22, 0.25);
}
.sidebar-header {
  padding: 32px 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.5px;
  line-height: 1.2;
  position: relative;
}
.brand-logo::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(232, 163, 61, 0.8);
  flex-shrink: 0;
}
.sidebar-nav {
  flex: 1;
  padding: 28px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 24px;
  color: rgba(255,255,255,0.7);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
}
.sidebar-nav .nav-link::before {
  content: "";
  width: 3px; height: 20px;
  border-radius: 0 4px 4px 0;
  background: var(--accent);
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%) scaleY(0);
  transition: var(--transition);
}
.sidebar-nav .nav-link:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.05);
}
.sidebar-nav .nav-link:hover::before,
.sidebar-nav .nav-link.active::before {
  transform: translateY(-50%) scaleY(1);
}
.sidebar-nav .nav-link.active {
  color: #ffffff;
  font-weight: 600;
  background: rgba(255,255,255,0.06);
}
.nav-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  flex-shrink: 0;
  transition: var(--transition);
}
.nav-link:hover .nav-dot,
.nav-link.active .nav-dot {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(232, 163, 61, 0.6);
}
.sidebar-footer {
  padding: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar-footer p {
  color: rgba(255,255,255,0.4);
  font-size: 12px;
  line-height: 1.6;
}
.burger {
  display: none;
  background: none;
  border: none;
  width: 40px; height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.burger span {
  display: block;
  width: 20px; height: 2px;
  background: #ffffff;
  border-radius: 2px;
  transition: var(--transition);
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  background-color: var(--primary-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.55;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(6,8,22,0.92) 0%, rgba(6,8,22,0.65) 45%, rgba(6,8,22,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 100px;
  padding-bottom: 120px;
}
.hero-eye {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-eye::before {
  content: "";
  width: 30px; height: 2px;
  background: var(--accent);
}
.hero h1 {
  font-size: clamp(44px, 6vw, 72px);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 2px;
  margin-bottom: 20px;
  text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.hero-sub {
  font-size: clamp(16px, 1.8vw, 22px);
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid transparent;
}
.btn-accent {
  background: linear-gradient(135deg, #f0b75a, #e8a33d);
  color: #0b0f2a;
  box-shadow: 0 8px 24px rgba(232, 163, 61, 0.35);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(232, 163, 61, 0.5);
  background: linear-gradient(135deg, #f5c06d, #e8a33d);
}
.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: #ffffff;
  border-color: rgba(255,255,255,0.25);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.16);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-2px);
}
.hero-metrics {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  z-index: 3;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
}
.metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 48px;
  text-align: center;
  position: relative;
}
.metric + .metric::before {
  content: "";
  position: absolute;
  left: 0; top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255,255,255,0.1);
}
.metric-num {
  font-size: 28px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 1px;
}
.metric-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* ===== Section common ===== */
.section { padding: 100px 0; }
.section-head {
  margin-bottom: 56px;
  text-align: center;
}
.section-eyebrow {
  display: inline-block;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(32px, 3.5vw, 42px);
  color: var(--text);
  font-weight: 800;
  margin-bottom: 16px;
}
.section-head p {
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
  font-size: 16px;
}

/* ===== About ===== */
.about { background: var(--bg-white); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-text h3 {
  font-size: 26px;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.4;
}
.about-text p {
  color: var(--text-light);
  margin-bottom: 20px;
  font-size: 15px;
}
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 32px;
}
.about-stat {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
}
.about-stat .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}
.about-stat .label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}
.about-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); }
.about-image img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; }

/* ===== Categories ===== */
.categories { background: var(--bg); }
.cat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.cat-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--primary);
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.cat-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  transition: var(--transition);
}
.cat-card:hover .cat-card-bg { transform: scale(1.05); opacity: 0.6; }
.cat-card-gradient { position: absolute; inset: 0; background: linear-gradient(0deg, rgba(6,8,22,0.95) 0%, rgba(6,8,22,0.4) 60%, transparent 100%); }
.cat-card-body {
  position: relative;
  z-index: 2;
  padding: 32px;
  color: #fff;
}
.cat-label {
  display: inline-block;
  background: rgba(232, 163, 61, 0.2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 30px;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.cat-card h3 { font-size: 24px; margin-bottom: 10px; }
.cat-card p { font-size: 14px; color: rgba(255,255,255,0.75); margin-bottom: 20px; }
.cat-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
}
.cat-more:hover { gap: 10px; color: var(--accent-light); }

/* ===== News ===== */
.news { background: var(--bg-white); }
.news-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.news-item {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 32px 36px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.news-item:hover { box-shadow: var(--shadow); border-color: transparent; transform: translateX(4px); }
.news-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.news-cat {
  display: inline-block;
  background: rgba(232, 163, 61, 0.15);
  color: #b57f1f;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
}
.news-date { font-size: 13px; color: var(--text-muted); }
.news-title { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.news-title a:hover { color: var(--accent-dark); }
.news-desc { color: var(--text-light); font-size: 14px; margin-bottom: 14px; }
.news-more { color: var(--accent-dark); font-size: 14px; font-weight: 600; }
.news-more:hover { color: var(--accent); gap: 6px; }
.news-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 15px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}

/* ===== Features ===== */
.features { background: var(--bg); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.feature-icon {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(232,163,61,0.15), rgba(232,163,61,0.08));
  color: var(--accent-dark);
  font-size: 28px;
  font-weight: 800;
}
.feature-card h3 { font-size: 17px; margin-bottom: 12px; }
.feature-card p { font-size: 14px; color: var(--text-light); line-height: 1.65; }

/* ===== Steps ===== */
.steps { background: var(--bg-white); }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; position: relative; }
.steps-grid::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--border) 0 8px, transparent 8px 16px);
  z-index: 0;
}
.step-item { position: relative; z-index: 1; text-align: center; padding-top: 10px; }
.step-num {
  width: 80px; height: 80px;
  margin: 0 auto 24px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 6px rgba(11,15,42,0.08), var(--shadow);
  position: relative;
  z-index: 1;
}
.step-item h3 { font-size: 17px; margin-bottom: 10px; }
.step-item p { font-size: 14px; color: var(--text-light); max-width: 220px; margin: 0 auto; }

/* ===== FAQ ===== */
.faq { background: var(--bg); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: var(--transition);
}
.faq-question:hover { color: var(--accent-dark); }
.faq-icon {
  width: 28px; height: 28px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}
.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--accent); color: #fff; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner { padding: 0 28px 24px; color: var(--text-light); font-size: 15px; }

/* ===== CTA ===== */
.cta { position: relative; padding: 120px 0; overflow: hidden; background-color: var(--primary-dark); }
.cta-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.4;
}
.cta-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(6,8,22,0.95) 0%, rgba(6,8,22,0.7) 100%); }
.cta-content { position: relative; z-index: 2; text-align: center; max-width: 640px; margin: 0 auto; }
.cta-content h2 { font-size: clamp(30px, 3.5vw, 40px); color: #fff; margin-bottom: 18px; }
.cta-content p { color: rgba(255,255,255,0.75); font-size: 16px; margin-bottom: 36px; }

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  padding: 60px 0 0;
  color: rgba(255,255,255,0.6);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand .brand-logo { margin-bottom: 16px; }
.footer-brand p { font-size: 14px; max-width: 320px; line-height: 1.8; color: rgba(255,255,255,0.5); }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
.footer-col a { display: block; color: rgba(255,255,255,0.5); font-size: 14px; padding: 6px 0; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .app-layout { flex-direction: column; }
  .main-content { margin-left: 0; }
  .sidebar {
    width: 100%;
    height: auto;
    position: sticky;
    top: 0;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    min-height: 64px;
    box-shadow: 0 4px 20px rgba(6,8,22,0.15);
  }
  .sidebar-header { padding: 12px 0; border-bottom: none; }
  .sidebar-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--primary);
    flex-direction: column;
    padding: 12px 0;
    box-shadow: 0 20px 30px rgba(6,8,22,0.3);
  }
  .sidebar-nav.open { display: flex; }
  .sidebar-footer { display: none; }
  .burger { display: flex; }
  .hero { min-height: 70vh; }
  .hero-content { padding-top: 80px; padding-bottom: 140px; }
  .metric { padding: 18px 32px; }
  .metric-num { font-size: 22px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .cat-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .steps-grid::before { display: none; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 70px 0; }
  .hero h1 { font-size: 36px; }
  .hero-sub { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; padding: 14px 24px; }
  .metric { padding: 16px 20px; }
  .metric-num { font-size: 18px; }
  .metric-label { font-size: 12px; }
  .news-item { padding: 24px; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; gap: 32px; }
  .step-item { max-width: 280px; margin: 0 auto; }
  .about-stat .num { font-size: 22px; }
  .cat-card { min-height: 260px; }
  .cat-card-body { padding: 24px; }
}

@media (max-width: 520px) {
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 28px; }
  .hero-metrics { position: relative; margin-top: 20px; background: rgba(255,255,255,0.03); }
  .metric + .metric::before { display: none; }
  .metric { flex: 1; min-width: 50%; padding: 14px 12px; }
  .about-stats { grid-template-columns: 1fr; }
  .cat-card h3 { font-size: 20px; }
  .news-item { padding: 20px; }
  .news-title { font-size: 16px; }
  .news-desc { font-size: 13px; }
  .feature-card { padding: 28px 20px; }
  .faq-question { padding: 18px 20px; font-size: 15px; }
  .footer-top { padding-bottom: 32px; }
}

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

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
  --primary: #6c5ce7;
  --primary-dark: #5a4bd1;
  --primary-light: #a29bfe;
  --primary-soft: rgba(108, 92, 231, 0.08);
  --accent: #ff6b6b;
  --accent-dark: #e85555;
  --bg: #f8f7fc;
  --bg-alt: #ffffff;
  --bg-dark: #12101f;
  --text: #12101f;
  --text-gray: #4b5563;
  --text-light: #9ca3af;
  --border: #e8e6f0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 6px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-width: 260px;
  --section-gap: 96px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

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

button {
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== 布局骨架 ===== */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  background: var(--bg-dark);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 32px 20px;
  transition: var(--transition);
}

.main-area {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-width: 0;
}

/* ===== 侧边导航 ===== */
.sidebar-brand {
  padding: 0 8px 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 24px;
}

.sidebar-brand .brand-logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.5px;
  display: block;
  line-height: 1.4;
}

.sidebar-brand .brand-sub {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.75rem;
  margin-top: 6px;
  letter-spacing: 2px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.sidebar-nav .nav-link .nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: var(--transition);
  flex-shrink: 0;
}

.sidebar-nav .nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.sidebar-nav .nav-link:hover .nav-dot {
  background: var(--primary-light);
}

.sidebar-nav .nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.35), rgba(108, 92, 231, 0.15));
  border-left-color: var(--primary-light);
}

.sidebar-nav .nav-link.active .nav-dot {
  background: var(--primary-light);
  box-shadow: 0 0 8px rgba(162, 155, 254, 0.8);
}

.sidebar-side {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-side p {
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.75rem;
  line-height: 1.6;
}

/* 移动端菜单按钮 */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--bg-dark);
  z-index: 999;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.mobile-header .m-brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
}

.menu-toggle {
  color: #fff;
  font-size: 1.4rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1001;
  backdrop-filter: blur(4px);
}

/* ===== Hero ===== */
.page-hero {
  position: relative;
  min-height: 460px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(18, 16, 31, 0.93) 0%, rgba(48, 40, 80, 0.82) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  color: #fff;
  padding: 100px 0 80px;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to top, var(--bg), transparent);
}

.hero-inner {
  max-width: 760px;
  position: relative;
  z-index: 2;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 8px 18px;
  border-radius: 40px;
  font-size: 0.85rem;
  letter-spacing: 2px;
  backdrop-filter: blur(8px);
  margin-bottom: 24px;
}

.hero-tag i {
  color: var(--primary-light);
}

.page-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.page-hero h1 span {
  background: linear-gradient(120deg, var(--primary-light), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 36px;
  max-width: 600px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.5);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
}

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

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

.section-dark {
  background: var(--bg-dark);
  color: #fff;
}

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

.section-eyebrow {
  display: inline-block;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--text-gray);
  font-size: 1rem;
  line-height: 1.7;
}

.section-dark .section-sub {
  color: rgba(255, 255, 255, 0.6);
}

.section-head.left {
  text-align: left;
  margin-left: 0;
}

/* ===== 数据统计条 ===== */
.stats-bar {
  background: var(--bg-alt);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 48px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: -60px;
  position: relative;
  z-index: 3;
  border: 1px solid var(--border);
}

.stat-item {
  text-align: center;
  padding: 16px 8px;
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 8px;
}

.stat-number i {
  font-size: 1.8rem;
  margin-right: 6px;
  color: var(--accent);
}

.stat-label {
  color: var(--text-gray);
  font-size: 0.9rem;
}

/* ===== 技巧卡片区 ===== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.tech-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.tech-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.tech-card-img {
  position: relative;
  height: 210px;
  overflow: hidden;
}

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

.tech-card:hover .tech-card-img img {
  transform: scale(1.06);
}

.tech-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(18, 16, 31, 0.4), transparent 60%);
}

.tech-card-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  padding: 5px 14px;
  border-radius: 30px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  z-index: 2;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.tech-card-body {
  padding: 28px 24px 24px;
}

.tech-card-body h3 {
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
}

.tech-card-body p {
  color: var(--text-gray);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 18px;
}

.tech-card-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.tech-card-link i {
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.tech-card-link:hover {
  color: var(--primary-dark);
}

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

/* ===== 图文内容区 ===== */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

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

.feature-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.feature-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.2), transparent 50%);
  z-index: 1;
}

.feature-exp-card {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 16px 22px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  z-index: 2;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.feature-exp-card i {
  color: var(--primary);
  margin-right: 6px;
}

.feature-content {
  padding: 20px 0;
}

.feature-content .section-title {
  margin-bottom: 20px;
}

.feature-list {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.feature-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-list .list-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.feature-list .list-text h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.feature-list .list-text p {
  font-size: 0.88rem;
  color: var(--text-gray);
  line-height: 1.6;
}

/* ===== 学习路径 ===== */
.path-section {
  background: var(--bg-alt);
}

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

.path-item {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px 28px;
  transition: var(--transition);
}

.path-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.path-item::before {
  counter-increment: path;
  content: "0" counter(path);
  font-size: 2.4rem;
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1px var(--primary-light);
  position: absolute;
  top: 20px;
  right: 20px;
  opacity: 0.5;
  line-height: 1;
}

.path-step {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  margin-bottom: 20px;
  box-shadow: 0 6px 20px rgba(108, 92, 231, 0.3);
}

.path-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.path-item p {
  color: var(--text-gray);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* ===== 内容列表 ===== */
.tips-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tip-row {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  transition: var(--transition);
  cursor: pointer;
}

.tip-row:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateX(6px);
}

.tip-num {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.tip-content {
  flex: 1;
}

.tip-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.tip-content p {
  font-size: 0.88rem;
  color: var(--text-gray);
}

.tip-more {
  color: var(--primary);
  font-size: 1.1rem;
  transition: var(--transition);
}

.tip-row:hover .tip-more {
  transform: translateX(6px);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item[open] {
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.faq-item summary {
  padding: 22px 26px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '\f078';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  color: var(--primary);
  font-size: 0.85rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  transform: rotate(180deg);
}

.faq-item summary:hover {
  background: var(--primary-soft);
}

.faq-answer {
  padding: 0 26px 22px;
  font-size: 0.92rem;
  color: var(--text-gray);
  line-height: 1.75;
}

/* ===== CTA ===== */
.cta-box {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 60%, #4d3bb8 100%);
  border-radius: 24px;
  padding: 60px 48px;
  position: relative;
  overflow: hidden;
  text-align: center;
  color: #fff;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -20%;
  width: 450px;
  height: 450px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
}

.cta-box::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: 10%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
}

.cta-box h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 36px;
  position: relative;
  z-index: 1;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

.cta-actions .btn-light {
  background: #fff;
  color: var(--primary);
}

.cta-actions .btn-light:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-actions .btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: #fff;
  background: transparent;
}

.cta-actions .btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 72px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .brand-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  display: inline-block;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.5);
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--primary-light);
  transform: translateX(4px);
}

.footer-bottom {
  padding-top: 32px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root {
    --section-gap: 72px;
  }

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

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

  .feature-row {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature-visual img {
    height: 340px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    padding: 32px;
  }

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

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 40px 0 60px rgba(0, 0, 0, 0.3);
  }

  .mobile-header {
    display: flex;
  }

  .mobile-overlay.show {
    display: block;
  }

  .main-area {
    margin-left: 0;
    padding-top: 64px;
  }

  .page-hero {
    min-height: 400px;
    padding: 80px 0 60px;
  }

  .container {
    padding: 0 20px;
  }

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

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

  .stats-bar {
    margin-top: -40px;
    padding: 24px;
    gap: 16px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .cta-box {
    padding: 48px 24px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 520px) {
  :root {
    --section-gap: 56px;
  }

  .page-hero h1 {
    font-size: 1.9rem;
  }

  .hero-desc {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

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

  .feature-visual img {
    height: 260px;
  }

  .tip-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .tip-more {
    align-self: flex-end;
  }

  .cta-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ===== 焦点可见性 ===== */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--primary-light);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== 滚动条定制 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(108, 92, 231, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(108, 92, 231, 0.5);
}

/* roulang page: article */
:root {
    --primary: #1d4ed8;
    --primary-dark: #172554;
    --primary-light: #dbeafe;
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --surface: #ffffff;
    --bg: #f1f5f9;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius-xl: 20px;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(15,23,42,0.06), 0 4px 12px rgba(15,23,42,0.04);
    --shadow-md: 0 4px 20px rgba(15,23,42,0.08);
    --shadow-lg: 0 12px 40px rgba(15,23,42,0.12);
    --shadow-accent: 0 8px 24px rgba(245,158,11,0.25);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-width: 268px;
}

* { 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", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}
.container-narrow {
    max-width: 920px;
}

/* 侧边栏 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--dark) 0%, #111c34 100%);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    overflow-y: auto;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.15) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 4px; }

.sidebar-brand {
    padding: 40px 28px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.brand-logo {
    display: inline-block;
    font-size: 22px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.5px;
    line-height: 1.3;
}
.brand-logo:hover { color: var(--accent); }
.brand-subtitle {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.5px;
}

.sidebar-nav-header {
    padding: 26px 28px 10px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.35);
}
.sidebar-nav {
    padding: 8px 14px;
    flex: 1;
}
.nav-link {
    display: flex;
    align-items: center;
    padding: 13px 16px;
    margin-bottom: 4px;
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.65);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}
.nav-link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
    transform: translateX(3px);
}
.nav-link.active {
    background: linear-gradient(135deg, rgba(29, 78, 216, 0.35), rgba(29, 78, 216, 0.15));
    color: #ffffff;
    font-weight: 600;
}
.nav-link.active::after {
    content: "";
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px rgba(245, 158, 11, 0.6);
}
.nav-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    margin-right: 14px;
    flex-shrink: 0;
    transition: var(--transition);
}
.nav-link:hover .nav-dot { background: var(--accent); }
.nav-link.active .nav-dot { background: var(--accent); box-shadow: 0 0 8px rgba(245, 158, 11, 0.5); }

.sidebar-footer {
    padding: 20px 28px 26px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    text-align: center;
}
.sidebar-footer p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
    line-height: 1.6;
}

/* 主内容区 */
.main-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
}
.main-wrapper main { flex: 1; }

/* 汉堡按钮 */
.nav-toggle {
    display: none;
    position: fixed;
    top: 18px;
    left: 18px;
    z-index: 1200;
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: var(--dark);
    box-shadow: var(--shadow-md);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}
.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: #ffffff;
    border-radius: 2px;
    transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(2px);
    z-index: 999;
}

/* Page Hero */
.page-hero {
    position: relative;
    min-height: 420px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--dark);
    padding: 80px 0;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.45;
    transform: scale(1.02);
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.7) 50%, rgba(15, 23, 42, 0.4) 100%);
}
.page-hero .container { position: relative; z-index: 2; }

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}
.breadcrumb a { color: rgba(255, 255, 255, 0.65); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { opacity: 0.4; }
.breadcrumb-current { color: rgba(255, 255, 255, 0.8); }

.article-badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 16px;
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 30px;
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 18px;
}
.page-hero h1 {
    font-size: 38px;
    font-weight: 800;
    line-height: 1.3;
    color: #ffffff;
    max-width: 780px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}
.article-meta-top {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}
.article-meta-top span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.meta-icon {
    font-style: normal;
    opacity: 0.8;
}

/* 文章正文区 */
.article-body-section {
    padding: 60px 0 30px;
    position: relative;
}
.article-shell {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: 48px;
    border: 1px solid rgba(226, 232, 240, 0.6);
}
.article-content {
    font-size: 16.5px;
    line-height: 1.95;
    color: var(--text);
    word-break: break-word;
}
.article-content p {
    margin-bottom: 20px;
}
.article-content h2 {
    font-size: 26px;
    font-weight: 700;
    margin: 40px 0 16px;
    color: var(--dark);
    line-height: 1.4;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-light);
}
.article-content h3 {
    font-size: 21px;
    font-weight: 600;
    margin: 30px 0 12px;
    color: var(--dark);
    line-height: 1.4;
}
.article-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 10px;
    color: var(--dark);
}
.article-content ul,
.article-content ol {
    margin: 16px 0 24px;
    padding-left: 28px;
}
.article-content ul li {
    list-style: disc;
    margin-bottom: 8px;
    line-height: 1.8;
}
.article-content ol li {
    list-style: decimal;
    margin-bottom: 8px;
    line-height: 1.8;
}
.article-content strong { font-weight: 700; color: var(--dark); }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 4px; }
.article-content a:hover { color: var(--primary-dark); }
.article-content img {
    border-radius: var(--radius-lg);
    margin: 24px 0;
    box-shadow: var(--shadow-md);
}
.article-content blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    padding: 20px 24px;
    margin: 24px 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--primary-dark);
    position: relative;
}
.article-content blockquote p { margin-bottom: 0; }
.article-content code {
    background: var(--dark);
    color: var(--accent);
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.9em;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
.article-content pre {
    background: var(--dark);
    color: #e2e8f0;
    padding: 20px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 24px 0;
    line-height: 1.6;
}
.article-content pre code { background: none; color: inherit; padding: 0; }
.article-content hr {
    border: none;
    height: 1px;
    background: var(--border);
    margin: 32px 0;
}
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
}
.article-content th {
    background: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 600;
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--border);
}
.article-content td {
    padding: 12px 16px;
    border: 1px solid var(--border);
}

/* 文章底部元信息 */
.article-footer-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.tag {
    display: inline-block;
    padding: 5px 14px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid transparent;
}
.share-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-muted);
}
.share-link {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--bg);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.share-link:hover {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* 未找到 */
.not-found-box {
    text-align: center;
    padding: 60px 20px;
}
.nf-icon {
    display: block;
    font-size: 52px;
    margin-bottom: 20px;
}
.not-found-box h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}
.not-found-box p {
    color: var(--text-muted);
    margin-bottom: 28px;
    font-size: 16px;
}
.empty-tip {
    text-align: center;
    color: var(--text-muted);
    padding: 30px;
    background: var(--bg);
    border-radius: var(--radius-md);
    font-size: 15px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    transition: var(--transition);
    border: 2px solid transparent;
}
.btn-primary {
    background: var(--primary);
    color: #ffffff;
    box-shadow: 0 4px 16px rgba(29, 78, 216, 0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(29, 78, 216, 0.4);
}
.btn-light {
    background: #ffffff;
    color: var(--dark);
    box-shadow: var(--shadow-md);
}
.btn-light:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.btn-outline-light {
    background: transparent;
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.4);
}
.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
    transform: translateY(-2px);
}
.btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* 信息条 */
.info-strip-section {
    padding: 30px 0 50px;
}
.info-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.info-item {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.info-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
}
.info-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.info-item:hover::before { opacity: 1; }
.info-num {
    font-size: 34px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    margin-bottom: 6px;
}
.info-label {
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 500;
}

/* 相关推荐 */
.related-section {
    padding: 50px 0 60px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.section-head {
    text-align: center;
    margin-bottom: 40px;
}
.section-head h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.5px;
    margin-bottom: 10px;
}
.section-head p {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 560px;
    margin: 0 auto;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.related-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
    display: block;
}
.related-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(29, 78, 216, 0.2);
}
.related-img {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}
.related-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.related-card:hover .related-img img {
    transform: scale(1.06);
}
.card-tag {
    position: absolute;
    top: 14px;
    left: 14px;
    padding: 5px 14px;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    color: #ffffff;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.related-body {
    padding: 22px 24px 24px;
}
.related-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
}
.related-body p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 14px;
}
.related-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.related-link:hover { gap: 8px; }

/* FAQ */
.faq-section {
    padding: 60px 0;
    background: var(--bg);
}
.faq-list {
    max-width: 860px;
    margin: 0 auto;
    display: grid;
    gap: 16px;
}
.faq-item {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}
.faq-item h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    position: relative;
    padding-left: 24px;
}
.faq-item h3::before {
    content: "Q";
    position: absolute;
    left: 0;
    top: 1px;
    font-size: 13px;
    font-weight: 800;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 6px;
    padding: 0 5px;
    line-height: 20px;
}
.faq-item p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.75;
    padding-left: 24px;
}

/* CTA */
.cta-section {
    padding: 40px 0 70px;
    background: var(--bg);
}
.cta-box {
    background: linear-gradient(135deg, var(--dark) 0%, #111c34 60%, #1a2747 100%);
    border-radius: var(--radius-xl);
    padding: 70px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.cta-box::before {
    content: "";
    position: absolute;
    top: -40%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
    pointer-events: none;
}
.cta-box::after {
    content: "";
    position: absolute;
    bottom: -60%;
    left: -5%;
    width: 380px;
    height: 380px;
    background: radial-gradient(circle, rgba(29, 78, 216, 0.2) 0%, transparent 70%);
    pointer-events: none;
}
.cta-box h2 {
    font-size: 32px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
    letter-spacing: -0.5px;
}
.cta-box p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 16px;
    margin-bottom: 32px;
    position: relative;
    z-index: 1;
}
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}

/* 页脚 */
.site-footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.6);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}
.footer-brand .brand-logo {
    font-size: 22px;
    color: #ffffff;
    margin-bottom: 16px;
    display: block;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.5);
    max-width: 340px;
}
.footer-col h4 {
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 18px;
    letter-spacing: -0.3px;
}
.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    padding: 5px 0;
    transition: var(--transition);
}
.footer-col a:hover {
    color: var(--accent);
    padding-left: 6px;
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.07);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
}

/* 响应式 */
@media (max-width: 1200px) {
    .container { padding: 0 28px; }
    .article-shell { padding: 40px; }
    .page-hero h1 { font-size: 34px; }
}

@media (max-width: 1023px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 4px 0 30px rgba(0, 0, 0, 0.15);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-wrapper {
        margin-left: 0;
    }
    .nav-toggle {
        display: flex;
    }
    .sidebar-overlay.active {
        display: block;
    }
    body.menu-open { overflow: hidden; }
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .info-strip {
        grid-template-columns: repeat(2, 1fr);
    }
    .cta-box { padding: 50px 40px; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .page-hero {
        min-height: 360px;
        padding: 60px 0;
    }
    .page-hero h1 {
        font-size: 26px;
        line-height: 1.35;
    }
    .article-body-section { padding: 30px 0 20px; }
    .article-shell {
        padding: 32px 24px;
        border-radius: var(--radius-lg);
    }
    .article-content { font-size: 15.5px; line-height: 1.85; }
    .article-content h2 { font-size: 22px; }
    .article-content h3 { font-size: 18px; }
    .footer-top {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .section-head h2 { font-size: 26px; }
    .cta-box h2 { font-size: 24px; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .cta-buttons .btn { width: 100%; max-width: 280px; }
    .related-grid {
        gap: 16px;
    }
    .article-footer-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 520px) {
    .related-grid {
        grid-template-columns: 1fr;
    }
    .info-strip {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .page-hero h1 {
        font-size: 22px;
    }
    .article-meta-top {
        gap: 10px;
        font-size: 13px;
    }
    .breadcrumb {
        font-size: 13px;
        flex-wrap: wrap;
    }
    .article-shell {
        padding: 24px 18px;
    }
    .tag-list .tag {
        font-size: 12px;
        padding: 4px 10px;
    }
    .cta-box {
        padding: 40px 24px;
        border-radius: var(--radius-lg);
    }
}

/* 可访问性 */
:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* roulang page: category2 */
:root{
  --primary:#e7b95b;
  --primary-dark:#d19a33;
  --primary-light:#f2d48f;
  --bg-deep:#0b0e1a;
  --bg-dark:#0f1524;
  --bg-card:#171e31;
  --bg-card-hover:#1f2742;
  --bg-soft:#222b47;
  --text-main:#eef0f5;
  --text-secondary:#9aa3b8;
  --text-muted:#6d7690;
  --border:rgba(231,185,91,0.2);
  --border-soft:rgba(255,255,255,0.08);
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:24px;
  --shadow-sm:0 6px 16px rgba(0,0,0,0.25);
  --shadow-md:0 12px 32px rgba(0,0,0,0.3);
  --shadow-lg:0 18px 48px rgba(0,0,0,0.4);
  --shadow-gold:0 0 0 1px rgba(231,185,91,0.25),0 12px 36px rgba(0,0,0,0.35);
  --transition:all .28s cubic-bezier(.25,.8,.35,1);
  --sidebar-width:264px;
  --container:1240px;
  --gap:28px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg-dark);color:var(--text-main);line-height:1.75;font-size:16px;min-height:100vh;letter-spacing:.2px}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font-family:inherit}
input,textarea,select{font-family:inherit}
::selection{background:rgba(231,185,91,.3);color:#fff}
.container{max-width:var(--container);margin:0 auto;padding:0 28px}
.site-layout{display:flex;min-height:100vh}
.page-main{margin-left:var(--sidebar-width);flex:1;min-width:0;background:var(--bg-dark);display:flex;flex-direction:column}
.page-main main{flex:1}

/* Sidebar */
.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background:linear-gradient(180deg,#11172b 0%,#0b0e1a 100%);border-right:1px solid var(--border-soft);z-index:120;display:flex;flex-direction:column;padding:30px 22px 22px;overflow-y:auto}
.sidebar-inner{display:flex;flex-direction:column;height:100%}
.brand-logo{display:inline-flex;align-items:center;font-size:22px;font-weight:800;color:#fff;text-decoration:none;letter-spacing:.5px;line-height:1.3;margin-bottom:8px}
.brand-logo::before{content:'';width:10px;height:10px;border-radius:50%;background:var(--primary);box-shadow:0 0 16px rgba(231,185,91,.65);margin-right:11px;flex-shrink:0}
.sidebar-tagline{font-size:13px;color:var(--text-muted);line-height:1.5;padding-left:21px;margin-bottom:36px}
.sidebar-nav{display:flex;flex-direction:column;gap:6px}
.nav-link{display:flex;align-items:center;gap:13px;padding:13px 16px;border-radius:var(--radius-md);color:var(--text-secondary);text-decoration:none;font-size:15px;font-weight:500;transition:var(--transition);position:relative;background:transparent}
.nav-link:hover{color:#fff;background:rgba(255,255,255,.06);transform:translateX(4px)}
.nav-link:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.nav-link.active{color:#fff;background:rgba(231,185,91,.14);box-shadow:inset 3px 0 0 var(--primary);font-weight:600}
.nav-dot{width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.4;flex-shrink:0}
.nav-link.active .nav-dot{background:var(--primary);opacity:1;box-shadow:0 0 10px rgba(231,185,91,.8)}
.sidebar-foot{margin-top:auto;padding-top:24px;border-top:1px solid var(--border-soft);font-size:12px;color:var(--text-muted);line-height:1.6}

/* Hero */
.hero{position:relative;min-height:520px;display:flex;align-items:center;justify-content:center;text-align:center;background:linear-gradient(180deg,rgba(11,14,26,.55) 0%,rgba(15,21,36,.75) 60%,var(--bg-dark) 100%),url('/assets/images/backpic/back-2.png') center/cover;padding:110px 28px 80px;overflow:hidden}
.hero::after{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 50% 60%,rgba(231,185,91,.14) 0%,transparent 70%);pointer-events:none}
.hero-inner{position:relative;z-index:2;max-width:780px}
.hero-badge{display:inline-flex;align-items:center;gap:10px;background:rgba(231,185,91,.14);border:1px solid var(--border);color:var(--primary-light);font-size:13px;font-weight:600;padding:7px 18px;border-radius:999px;letter-spacing:1px;margin-bottom:24px;backdrop-filter:blur(4px)}
.hero-badge i{font-size:14px}
.hero h1{font-size:clamp(34px,5vw,52px);font-weight:800;line-height:1.2;color:#fff;letter-spacing:.5px;margin-bottom:18px;text-shadow:0 4px 30px rgba(0,0,0,.45)}
.hero p{font-size:clamp(15px,2vw,17px);color:var(--text-secondary);line-height:1.8;max-width:620px;margin:0 auto 36px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 30px;border-radius:999px;border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;transition:var(--transition);text-decoration:none;line-height:1.4}
.btn:focus-visible{outline:2px solid #fff;outline-offset:3px}
.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#0b0e1a;box-shadow:0 8px 28px rgba(231,185,91,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 36px rgba(231,185,91,.45)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);color:#eef0f5;backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.3);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(0)}
.hero-meta{display:flex;gap:28px;justify-content:center;margin-top:44px;flex-wrap:wrap}
.hero-meta-item{background:rgba(255,255,255,.05);border:1px solid var(--border-soft);border-radius:var(--radius-md);padding:14px 22px;text-align:center;min-width:140px;backdrop-filter:blur(6px)}
.hero-meta-item strong{display:block;font-size:21px;font-weight:800;color:var(--primary-light)}
.hero-meta-item span{font-size:12px;color:var(--text-muted);letter-spacing:1px}

/* Section */
.section{padding:74px 0;position:relative}
.section-header{max-width:640px;margin-bottom:48px}
.section-header.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--primary);letter-spacing:2px;text-transform:uppercase;margin-bottom:12px}
.eyebrow::before{content:'';width:24px;height:2px;background:var(--primary);border-radius:2px}
.section-header h2{font-size:clamp(26px,3.5vw,36px);font-weight:800;line-height:1.3;color:#fff;letter-spacing:.3px;margin-bottom:14px}
.section-header p{font-size:15px;color:var(--text-secondary);line-height:1.75}

/* Card Row */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card-item{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius-lg);padding:32px 26px;transition:var(--transition);position:relative;overflow:hidden}
.card-item::before{content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,var(--primary),transparent);opacity:0;transition:var(--transition)}
.card-item:hover{background:var(--bg-card-hover);transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--border)}
.card-item:hover::before{opacity:1}
.card-icon{width:54px;height:54px;border-radius:14px;background:rgba(231,185,91,.12);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:22px;color:var(--primary);margin-bottom:20px;transition:var(--transition)}
.card-item:hover .card-icon{background:rgba(231,185,91,.22);transform:scale(1.06)}
.card-item h3{font-size:16px;font-weight:700;color:#fff;margin-bottom:10px;line-height:1.4}
.card-item p{font-size:14px;color:var(--text-secondary);line-height:1.7}

/* Feature Blocks */
.feature-list{display:flex;flex-direction:column;gap:32px}
.feature-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius-lg);padding:36px;transition:var(--transition)}
.feature-block:hover{border-color:var(--border);box-shadow:var(--shadow-md)}
.feature-img{border-radius:var(--radius-md);overflow:hidden;position:relative}
.feature-img img{width:100%;height:260px;object-fit:cover;transition:transform .5s ease}
.feature-block:hover .feature-img img{transform:scale(1.03)}
.feature-img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(11,14,26,.45));border-radius:var(--radius-md)}
.feature-content .tag{display:inline-block;font-size:12px;font-weight:600;color:var(--primary-light);background:rgba(231,185,91,.12);border:1px solid var(--border);border-radius:99px;padding:4px 14px;margin-bottom:16px}
.feature-content h3{font-size:22px;font-weight:700;color:#fff;margin-bottom:12px;line-height:1.4}
.feature-content p{font-size:15px;color:var(--text-secondary);line-height:1.75;margin-bottom:16px}
.feature-content ul{display:flex;flex-direction:column;gap:8px}
.feature-content ul li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text-secondary)}
.feature-content ul li i{color:var(--primary);font-size:14px;margin-top:5px;flex-shrink:0}

/* Steps */
.steps-wrap{background:linear-gradient(180deg,rgba(11,14,26,.7),rgba(11,14,26,.9)),url('/assets/images/backpic/back-1.png') center/cover;border-radius:var(--radius-lg);padding:48px;border:1px solid var(--border-soft)}
.step-list{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.step-item{position:relative;padding-left:30px;border-left:1px solid rgba(231,185,91,.3)}
.step-num{font-size:32px;font-weight:800;color:var(--primary);line-height:1;margin-bottom:12px;text-shadow:0 0 24px rgba(231,185,91,.4)}
.step-item h3{font-size:17px;font-weight:700;color:#fff;margin-bottom:10px}
.step-item p{font-size:14px;color:var(--text-secondary);line-height:1.7}

/* Tips */
.tips-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tip-card{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius-lg);padding:28px;transition:var(--transition);position:relative;overflow:hidden}
.tip-card::after{content:'';position:absolute;right:-24px;top:-24px;width:80px;height:80px;border-radius:50%;background:rgba(231,185,91,.06);transition:var(--transition)}
.tip-card:hover{background:var(--bg-card-hover);transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--border)}
.tip-card:hover::after{transform:scale(1.6)}
.tip-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.tip-num{font-size:15px;font-weight:800;color:var(--primary);letter-spacing:1px}
.tip-tag{font-size:12px;color:var(--text-muted);background:rgba(255,255,255,.06);border:1px solid var(--border-soft);padding:3px 12px;border-radius:99px}
.tip-card h3{font-size:17px;font-weight:700;color:#fff;margin-bottom:10px;line-height:1.45}
.tip-card p{font-size:14px;color:var(--text-secondary);line-height:1.7}

/* FAQ */
.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border-soft);border-radius:var(--radius-md);margin-bottom:14px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:var(--border);box-shadow:var(--shadow-sm)}
.faq-q{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:22px 24px;background:transparent;border:0;color:var(--text-main);font-size:16px;font-weight:600;cursor:pointer;transition:var(--transition)}
.faq-q:hover{color:var(--primary-light)}
.faq-q:focus-visible{outline:2px solid var(--primary);outline-offset:-2px}
.faq-q .faq-icon{width:28px;height:28px;border-radius:50%;background:rgba(231,185,91,.12);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--primary);flex-shrink:0;transition:var(--transition)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease}
.faq-item.open .faq-a{max-height:280px}
.faq-a p{padding:0 24px 22px 66px;font-size:14px;color:var(--text-secondary);line-height:1.75}

/* CTA */
.cta-section{padding:80px 0 74px}
.cta-box{position:relative;border-radius:var(--radius-lg);padding:70px 56px;text-align:center;background:linear-gradient(180deg,rgba(11,14,26,.65),rgba(11,14,26,.88)),url('/assets/images/backpic/back-3.png') center/cover;border:1px solid var(--border);overflow:hidden}
.cta-box::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at center,rgba(231,185,91,.12),transparent 65%);pointer-events:none}
.cta-box h2{font-size:clamp(26px,4vw,40px);font-weight:800;color:#fff;line-height:1.3;margin-bottom:14px;position:relative;z-index:2}
.cta-box p{font-size:15px;color:var(--text-secondary);max-width:560px;margin:0 auto 30px;position:relative;z-index:2}
.cta-box .btn{position:relative;z-index:2;margin:0 auto}

/* Footer */
.site-footer{background:var(--bg-deep);border-top:1px solid var(--border-soft);padding:60px 0 0;margin-top:auto}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:48px;padding-bottom:42px}
.footer-brand .brand-logo{font-size:22px;margin-bottom:16px}
.footer-brand p{font-size:14px;color:var(--text-secondary);line-height:1.75;max-width:340px}
.footer-col h4{font-size:14px;font-weight:700;color:#fff;margin-bottom:18px;letter-spacing:1px}
.footer-col a{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-secondary);padding:7px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--primary-light);transform:translateX(4px)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;padding:20px 0;border-top:1px solid var(--border-soft);font-size:13px;color:var(--text-muted)}

/* Responsive */
@media (max-width:1200px){
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .tips-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:1024px){
  :root{--sidebar-width:0px}
  .sidebar{position:sticky;top:0;left:0;right:0;width:100%;height:auto;flex-direction:row;align-items:center;padding:14px 20px;border-right:0;border-bottom:1px solid var(--border-soft);z-index:100;overflow-x:auto;gap:16px}
  .sidebar-inner{flex-direction:row;align-items:center;gap:20px;width:100%}
  .brand-logo{font-size:18px;margin-bottom:0;white-space:nowrap}
  .sidebar-tagline{display:none}
  .sidebar-nav{flex-direction:row;gap:4px;overflow-x:auto;white-space:nowrap;flex:1;padding-bottom:0}
  .nav-link{padding:10px 14px;font-size:14px;border-radius:999px}
  .nav-link:hover{transform:none}
  .nav-link.active{box-shadow:none;background:rgba(231,185,91,.2)}
  .nav-dot{display:none}
  .sidebar-foot{display:none}
  .page-main{margin-left:0}
  .container{padding:0 22px}
  .hero{margin-top:0;min-height:430px}
  .feature-block{grid-template-columns:1fr;gap:24px;padding:26px}
  .step-list{grid-template-columns:1fr;gap:24px}
  .step-item{padding-left:0;padding-top:22px;border-left:0;border-top:1px solid rgba(231,185,91,.25)}
}
@media (max-width:768px){
  .card-grid{grid-template-columns:1fr}
  .tips-grid{grid-template-columns:1fr}
  .hero{padding:70px 20px 56px;min-height:380px}
  .hero-meta{gap:14px}
  .hero-meta-item{min-width:100px;padding:10px 16px}
  .footer-top{grid-template-columns:1fr;gap:30px}
  .section{padding:54px 0}
  .steps-wrap{padding:32px 22px}
  .cta-box{padding:44px 24px}
  .feature-content h3{font-size:19px}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .brand-logo{font-size:15px}
  .brand-logo::before{width:8px;height:8px;margin-right:8px}
  .sidebar{padding:12px 14px}
  .nav-link{padding:9px 12px;font-size:13px}
  .hero-actions{flex-direction:column;width:100%;gap:10px}
  .hero-actions .btn{justify-content:center;width:100%}
  .btn{padding:12px 22px}
}