/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2332;
  --bg-elevated: #1f2a3f;
  --neon-blue: #00d4ff;
  --neon-purple: #8b5cf6;
  --neon-cyan: #06b6d4;
  --accent-glow: rgba(0, 212, 255, 0.15);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(0, 212, 255, 0.12);
  --border-glow: rgba(0, 212, 255, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 255, 0.05);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.08);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
  --header-h: 72px;
}

/* ===== Reset / Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
a { color: var(--neon-blue); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; text-shadow: 0 0 8px var(--neon-blue); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }

/* ===== Container ===== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ===== Typography ===== */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); margin-bottom: 16px; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
.section-sub { color: var(--neon-blue); font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 8px; display: block; }
.section-title { margin-bottom: 12px; }
.section-desc { color: var(--text-secondary); font-size: 1.05rem; max-width: 620px; line-height: 1.7; }

/* ===== Header / Nav ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-h);
  transition: var(--transition);
}
.header.scrolled { background: rgba(10, 14, 23, 0.98); border-bottom-color: var(--border-glow); box-shadow: 0 4px 30px rgba(0,0,0,0.5); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h); max-width: var(--container-max); margin: 0 auto; padding: 0 24px;
}
.logo {
  font-size: 1.35rem; font-weight: 800; color: #fff;
  display: flex; align-items: center; gap: 10px;
  letter-spacing: -0.02em;
}
.logo i { color: var(--neon-blue); font-size: 1.5rem; filter: drop-shadow(0 0 8px var(--neon-blue)); }
.logo span { background: linear-gradient(135deg, #fff, var(--neon-blue)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  padding: 8px 18px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  transition: var(--transition); position: relative;
}
.nav a:hover { color: #fff; background: rgba(0, 212, 255, 0.06); }
.nav a.active {
  color: #fff; background: rgba(0, 212, 255, 0.1);
  box-shadow: inset 0 -2px 0 var(--neon-blue);
}
.nav a.active::after {
  content: ''; position: absolute; bottom: -1px; left: 50%; transform: translateX(-50%);
  width: 60%; height: 2px; background: var(--neon-blue); border-radius: 2px;
  box-shadow: 0 0 12px var(--neon-blue);
}
.nav-cta {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple)) !important;
  color: #fff !important; padding: 10px 24px !important; border-radius: var(--radius-sm) !important;
  font-weight: 600 !important; box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
  transition: var(--transition) !important;
}
.nav-cta:hover { box-shadow: 0 0 40px rgba(0, 212, 255, 0.4) !important; transform: translateY(-1px); color: #fff !important; }
.nav-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; padding: 8px; }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav { position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    background: rgba(10, 14, 23, 0.98); backdrop-filter: blur(20px);
    flex-direction: column; gap: 4px; padding: 24px 16px;
    transform: translateX(100%); transition: var(--transition); overflow-y: auto; }
  .nav.open { transform: translateX(0); }
  .nav a { width: 100%; padding: 14px 20px; font-size: 1rem; text-align: center; }
  .nav-cta { margin-top: 12px; text-align: center; }
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; padding: 120px 0 80px; overflow: hidden;
  background: var(--bg-primary);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover; background-position: center; background-repeat: no-repeat;
  opacity: 0.35; filter: saturate(0.8) brightness(0.6);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, var(--bg-primary) 80%);
}
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 60%);
}
.hero-content { position: relative; z-index: 2; text-align: center; max-width: 860px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0, 212, 255, 0.08); border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 6px 18px; border-radius: 100px; font-size: 0.85rem; color: var(--neon-blue);
  margin-bottom: 24px; font-weight: 500;
}
.hero-badge i { font-size: 0.75rem; }
.hero h1 {
  margin-bottom: 20px; background: linear-gradient(135deg, #fff 40%, var(--neon-blue) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p {
  color: var(--text-secondary); font-size: 1.15rem; max-width: 600px; margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 32px; border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem;
  cursor: pointer; transition: var(--transition); border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  color: #fff; box-shadow: 0 0 30px rgba(0, 212, 255, 0.2);
}
.btn-primary:hover { box-shadow: 0 0 50px rgba(0, 212, 255, 0.4); transform: translateY(-2px); color: #fff; }
.btn-secondary {
  background: transparent; color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover { border-color: var(--neon-blue); box-shadow: 0 0 20px rgba(0, 212, 255, 0.1); color: #fff; }
@media (max-width: 520px) {
  .hero { padding: 100px 0 60px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .section-desc { margin: 0 auto; }
.section-dark { background: var(--bg-secondary); }
.section-border { border-top: 1px solid var(--border-color); }

/* ===== Grid / Cards ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; } }

.card {
  background: var(--bg-card); border-radius: var(--radius-md);
  border: 1px solid var(--border-color); padding: 28px 24px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-glow), var(--shadow-card); transform: translateY(-4px); }
.card-icon { width: 48px; height: 48px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 212, 255, 0.08); color: var(--neon-blue); font-size: 1.3rem;
  margin-bottom: 16px; transition: var(--transition);
}
.card:hover .card-icon { background: rgba(0, 212, 255, 0.15); box-shadow: 0 0 20px rgba(0, 212, 255, 0.1); }
.card h3 { margin-bottom: 10px; color: #fff; }
.card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }
.card-link { margin-top: 14px; display: inline-flex; align-items: center; gap: 6px; font-size: 0.9rem; font-weight: 500; }
.card-link i { font-size: 0.75rem; transition: var(--transition); }
.card-link:hover i { transform: translateX(4px); }

/* ===== Feature Card ===== */
.feature-card { display: flex; gap: 24px; align-items: flex-start; padding: 24px; }
.feature-card .card-icon { flex-shrink: 0; margin-bottom: 0; }
.feature-card-body h3 { font-size: 1.15rem; margin-bottom: 6px; }
.feature-card-body p { font-size: 0.92rem; }
@media (max-width: 520px) { .feature-card { flex-direction: column; gap: 12px; } }

/* ===== Cover Card ===== */
.cover-card {
  background: var(--bg-card); border-radius: var(--radius-md);
  border: 1px solid var(--border-color); overflow: hidden;
  transition: var(--transition);
}
.cover-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-glow), var(--shadow-card); transform: translateY(-4px); }
.cover-card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; }
.cover-card-body { padding: 20px 20px 24px; }
.cover-card-body h3 { font-size: 1.1rem; margin-bottom: 8px; color: #fff; }
.cover-card-body p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; margin-bottom: 12px; }
.cover-card-meta { display: flex; align-items: center; gap: 14px; font-size: 0.82rem; color: var(--text-muted); }
.cover-card-meta span { display: flex; align-items: center; gap: 4px; }
.badge {
  display: inline-block; padding: 3px 12px; border-radius: 100px;
  font-size: 0.75rem; font-weight: 600; background: rgba(0, 212, 255, 0.1); color: var(--neon-blue);
}
.badge-purple { background: rgba(139, 92, 246, 0.15); color: var(--neon-purple); }

/* ===== Stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 32px 16px; }
.stat-number { font-size: 2.8rem; font-weight: 800; background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1.2; }
.stat-label { color: var(--text-secondary); font-size: 0.95rem; margin-top: 6px; }
@media (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; } }
@media (max-width: 520px) { .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }

/* ===== Steps ===== */
.steps { display: flex; gap: 24px; position: relative; }
.step { flex: 1; text-align: center; position: relative; }
.step-num {
  width: 48px; height: 48px; border-radius: 50%; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.2rem; color: #fff;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); position: relative; z-index: 2;
}
.step h4 { color: #fff; margin-bottom: 8px; font-size: 1.05rem; }
.step p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; max-width: 260px; margin: 0 auto; }
.step-connector { position: absolute; top: 24px; left: calc(50% + 32px); right: calc(-50% + 32px); height: 2px; background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-blue)); opacity: 0.3; z-index: 1; }
@media (max-width: 768px) { .steps { flex-direction: column; gap: 32px; } .step-connector { display: none; } }

/* ===== FAQ ===== */
.faq-list { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); overflow: hidden; transition: var(--transition);
}
.faq-item:hover { border-color: var(--border-glow); }
.faq-q {
  padding: 18px 22px; display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; font-weight: 600; color: #fff; font-size: 1rem;
  background: none; border: none; width: 100%; text-align: left; gap: 16px;
}
.faq-q i { color: var(--neon-blue); transition: var(--transition); font-size: 0.85rem; flex-shrink: 0; }
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: var(--transition);
  padding: 0 22px; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 22px 20px; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(139, 92, 246, 0.05));
  border: 1px solid var(--border-color); border-radius: var(--radius-lg);
  padding: 64px 48px; text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 60%);
}
.cta-section h2 { position: relative; z-index: 1; }
.cta-section p { color: var(--text-secondary); max-width: 520px; margin: 0 auto 28px; position: relative; z-index: 1; }
.cta-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
@media (max-width: 520px) { .cta-section { padding: 40px 20px; } .cta-actions { flex-direction: column; align-items: center; } }

/* ===== Content List (CMS) ===== */
.content-list { display: flex; flex-direction: column; gap: 16px; }
.content-item {
  display: flex; gap: 20px; padding: 20px 24px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); transition: var(--transition); cursor: default;
}
.content-item:hover { border-color: var(--border-glow); box-shadow: var(--shadow-glow); }
.content-item-img { width: 120px; height: 80px; border-radius: var(--radius-sm); object-fit: cover; flex-shrink: 0; background: var(--bg-elevated); }
.content-item-body { flex: 1; min-width: 0; }
.content-item-body h3 { font-size: 1.05rem; margin-bottom: 6px; }
.content-item-body h3 a { color: #fff; }
.content-item-body h3 a:hover { color: var(--neon-blue); }
.content-item-body p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.content-item-meta { display: flex; align-items: center; gap: 14px; margin-top: 8px; font-size: 0.82rem; color: var(--text-muted); }
.content-item-meta span { display: flex; align-items: center; gap: 4px; }
@media (max-width: 520px) { .content-item { flex-direction: column; } .content-item-img { width: 100%; height: 140px; } }

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border-color);
  padding: 48px 0 32px; margin-top: 80px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; max-width: 320px; line-height: 1.7; }
.footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; font-weight: 600; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: var(--text-muted); font-size: 0.88rem; transition: var(--transition); }
.footer-links a:hover { color: var(--neon-blue); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.85rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--neon-blue); }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; gap: 8px; text-align: center; } }

/* ===== Misc ===== */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.gap-8 { gap: 8px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.empty-state { color: var(--text-muted); text-align: center; padding: 40px 20px; font-size: 0.95rem; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== 移动端适配 ===== */
@media (max-width: 1024px) {
  .section { padding: 60px 0; }
}
@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-header { margin-bottom: 32px; }
  .hero h1 { font-size: clamp(1.8rem, 6vw, 2.6rem); }
}
@media (max-width: 520px) {
  .section { padding: 36px 0; }
  .hero p { font-size: 1rem; }
}

/* roulang page: article */
:root {
  --primary: #00f0ff;
  --primary-dark: #00c8d4;
  --primary-glow: rgba(0, 240, 255, 0.35);
  --secondary: #ff6b9d;
  --secondary-glow: rgba(255, 107, 157, 0.3);
  --bg-dark: #0a0e1a;
  --bg-card: #111827;
  --bg-card-hover: #1a2236;
  --bg-elevated: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #1e3a5f;
  --border-glow: rgba(0, 240, 255, 0.15);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 240, 255, 0.06);
  --shadow-elevated: 0 16px 48px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(0, 240, 255, 0.1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); background: var(--bg-dark); color: var(--text-primary); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; text-shadow: 0 0 12px var(--primary-glow); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ===== 导航 ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 68px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.35rem; font-weight: 800; color: #fff; letter-spacing: -0.5px;
}
.logo i { color: var(--primary); font-size: 1.5rem; filter: drop-shadow(0 0 8px var(--primary-glow)); }
.logo span { background: linear-gradient(135deg, #fff 60%, var(--primary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo:hover span { background: linear-gradient(135deg, var(--primary), #fff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition); position: relative;
}
.nav a i { font-size: 0.85rem; }
.nav a:hover { color: #fff; background: rgba(0, 240, 255, 0.08); }
.nav a.active {
  color: #fff; background: rgba(0, 240, 255, 0.1);
  box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px rgba(0, 240, 255, 0.1);
}
.nav a.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0a0e1a; font-weight: 700; padding: 8px 22px; border-radius: var(--radius-sm);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}
.nav a.nav-cta:hover { background: linear-gradient(135deg, #fff, var(--primary)); color: #0a0e1a; box-shadow: 0 0 30px rgba(0, 240, 255, 0.4); transform: translateY(-1px); }
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; padding: 8px; border-radius: var(--radius-sm); }
.nav-toggle:hover { background: rgba(255,255,255,0.05); }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed; top: 68px; left: 0; right: 0;
    flex-direction: column; gap: 2px;
    background: rgba(10, 14, 26, 0.98); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px 20px;
    transform: translateY(-120%); opacity: 0; pointer-events: none;
    transition: var(--transition);
  }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }
}
/* ===== 文章页 ===== */
.article-page { padding-top: 68px; }
.article-banner {
  position: relative; padding: 80px 0 60px;
  background: linear-gradient(135deg, #0a0e1a 0%, #0f1a2e 50%, #0a0e1a 100%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}
.article-banner::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,240,255,0.04) 0%, transparent 70%);
  pointer-events: none;
}
.article-banner .container { position: relative; z-index: 1; }
.article-breadcrumb {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px;
}
.article-breadcrumb a { color: var(--text-muted); }
.article-breadcrumb a:hover { color: var(--primary); }
.article-breadcrumb .sep { color: var(--text-muted); font-size: 0.7rem; }
.article-breadcrumb .current { color: var(--text-secondary); }
.article-category {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.5px;
  background: rgba(0, 240, 255, 0.1); color: var(--primary);
  border: 1px solid rgba(0, 240, 255, 0.2); margin-bottom: 16px;
}
.article-title {
  font-size: 2.4rem; font-weight: 800; line-height: 1.3;
  color: #fff; max-width: 900px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.article-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 20px;
  margin-top: 24px; color: var(--text-secondary); font-size: 0.9rem;
}
.article-meta i { margin-right: 6px; color: var(--primary); font-size: 0.85rem; }
.article-body {
  padding: 60px 0 80px;
}
.article-body .container {
  display: grid; grid-template-columns: 1fr 300px; gap: 48px;
}
.article-content {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 40px 44px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}
.article-content h2 {
  font-size: 1.6rem; font-weight: 700; color: #fff;
  margin: 36px 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}
.article-content h3 { font-size: 1.25rem; font-weight: 600; color: var(--primary); margin: 28px 0 12px; }
.article-content p { margin-bottom: 18px; color: var(--text-secondary); line-height: 1.8; font-size: 1rem; }
.article-content ul, .article-content ol { margin: 16px 0 20px; padding-left: 24px; }
.article-content ul li { list-style: disc; margin-bottom: 8px; color: var(--text-secondary); }
.article-content ol li { list-style: decimal; margin-bottom: 8px; color: var(--text-secondary); }
.article-content strong { color: #fff; font-weight: 600; }
.article-content a { color: var(--primary); border-bottom: 1px solid transparent; }
.article-content a:hover { border-bottom-color: var(--primary); }
.article-content blockquote {
  margin: 24px 0; padding: 20px 24px; border-left: 4px solid var(--primary);
  background: rgba(0, 240, 255, 0.04); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary); font-style: italic;
}
.article-content img { margin: 24px 0; border-radius: var(--radius-md); box-shadow: 0 4px 20px rgba(0,0,0,0.4); }
.article-content code {
  background: rgba(0, 240, 255, 0.08); padding: 2px 8px; border-radius: 4px;
  font-size: 0.9em; color: var(--primary);
}
.article-sidebar {
  display: flex; flex-direction: column; gap: 28px;
}
.sidebar-card {
  background: var(--bg-card); border-radius: var(--radius-md);
  padding: 28px; border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}
.sidebar-card h3 {
  font-size: 1.05rem; font-weight: 700; color: #fff;
  margin-bottom: 16px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; gap: 8px;
}
.sidebar-card h3 i { color: var(--primary); }
.sidebar-links { display: flex; flex-direction: column; gap: 10px; }
.sidebar-links a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 0.9rem;
  background: rgba(255,255,255,0.02); transition: var(--transition);
}
.sidebar-links a:hover { background: rgba(0, 240, 255, 0.06); color: #fff; }
.sidebar-links a i { color: var(--primary); font-size: 0.8rem; }
.sidebar-cta {
  background: linear-gradient(135deg, rgba(0,240,255,0.08), rgba(255,107,157,0.06));
  border: 1px solid rgba(0, 240, 255, 0.15);
}
.sidebar-cta p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.6; }
.btn-sidebar {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0a0e1a; font-weight: 700; font-size: 0.9rem;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
  transition: var(--transition); border: none; cursor: pointer;
}
.btn-sidebar:hover { background: linear-gradient(135deg, #fff, var(--primary)); color: #0a0e1a; transform: translateY(-2px); box-shadow: 0 0 30px rgba(0, 240, 255, 0.3); }
.article-notfound {
  grid-column: 1 / -1; text-align: center; padding: 80px 20px;
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}
.article-notfound i { font-size: 3rem; color: var(--text-muted); margin-bottom: 20px; display: block; }
.article-notfound h2 { font-size: 1.6rem; color: #fff; margin-bottom: 12px; }
.article-notfound p { color: var(--text-secondary); margin-bottom: 24px; }
.btn-back {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #0a0e1a; font-weight: 700;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
  transition: var(--transition);
}
.btn-back:hover { background: linear-gradient(135deg, #fff, var(--primary)); color: #0a0e1a; transform: translateY(-2px); box-shadow: 0 0 30px rgba(0, 240, 255, 0.3); }
/* ===== 文章底部导航 ===== */
.article-footer-nav {
  margin-top: 40px; padding-top: 28px;
  border-top: 1px solid var(--border-color);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.article-footer-nav a {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03); color: var(--text-secondary);
  font-size: 0.9rem; transition: var(--transition);
  border: 1px solid transparent;
}
.article-footer-nav a:hover { background: rgba(0,240,255,0.06); color: #fff; border-color: rgba(0,240,255,0.15); }
/* ===== 页脚 ===== */
.footer {
  background: #070b14; border-top: 1px solid var(--border-color);
  padding: 64px 0 28px; margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { font-size: 1.3rem; margin-bottom: 16px; }
.footer-brand p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; max-width: 320px; }
.footer h4 { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: 18px; letter-spacing: 0.3px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: var(--text-muted); transition: var(--transition); display: flex; align-items: center; gap: 8px; }
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-links a i { font-size: 0.8rem; width: 16px; color: var(--text-muted); }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.82rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }
@media (max-width: 1024px) {
  .article-body .container { grid-template-columns: 1fr; }
  .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
}
@media (max-width: 768px) {
  .article-title { font-size: 1.6rem; }
  .article-content { padding: 24px 20px; }
  .article-banner { padding: 60px 0 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .article-sidebar { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .article-title { font-size: 1.3rem; }
  .article-meta { flex-direction: column; gap: 8px; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
  .article-footer-nav { flex-direction: column; align-items: stretch; }
  .article-footer-nav a { justify-content: center; }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00f0ff;
            --primary-dark: #00b8c9;
            --primary-glow: rgba(0, 240, 255, 0.25);
            --accent: #ff2d95;
            --accent-glow: rgba(255, 45, 149, 0.25);
            --bg-dark: #0b0e17;
            --bg-card: #111827;
            --bg-card-hover: #1a2332;
            --bg-section-alt: #0f1520;
            --text-main: #e8edf5;
            --text-secondary: #94a3b8;
            --text-weak: #64748b;
            --border-color: rgba(0, 240, 255, 0.12);
            --border-glow: rgba(0, 240, 255, 0.25);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 240, 255, 0.06);
            --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(0, 240, 255, 0.15);
            --shadow-glow: 0 0 40px rgba(0, 240, 255, 0.08);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-main);
            background: var(--bg-dark);
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #fff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--primary);
            background: rgba(0, 240, 255, 0.08);
            border: 1px solid rgba(0, 240, 255, 0.15);
            padding: 6px 16px;
            border-radius: 100px;
            margin-bottom: 16px;
        }
        .section-label i {
            font-size: 0.7rem;
        }
        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
        }
        .text-center {
            text-align: center;
        }
        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }
        .mb-1 {
            margin-bottom: 8px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .mb-3 {
            margin-bottom: 24px;
        }
        .mb-4 {
            margin-bottom: 32px;
        }
        .mb-5 {
            margin-bottom: 48px;
        }
        .mt-4 {
            margin-top: 32px;
        }
        .mt-5 {
            margin-top: 48px;
        }
        .gap-4 {
            gap: 32px;
        }

        /* ===== 霓虹按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            border-radius: 100px;
            cursor: pointer;
            transition: all var(--transition);
            background: transparent;
            color: var(--text-main);
            text-decoration: none;
            position: relative;
            overflow: hidden;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            box-shadow: 0 4px 24px var(--primary-glow);
        }
        .btn-primary:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 40px var(--primary-glow);
            color: #0b0e17;
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-outline {
            border: 1.5px solid var(--border-glow);
            color: var(--primary);
            background: rgba(0, 240, 255, 0.04);
        }
        .btn-outline:hover {
            background: rgba(0, 240, 255, 0.12);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 32px var(--primary-glow);
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent), #c01f6e);
            color: #fff;
            box-shadow: 0 4px 24px var(--accent-glow);
        }
        .btn-accent:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 40px var(--accent-glow);
            color: #fff;
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.9rem;
        }

        /* ===== Header & Nav (暗色霓虹) ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(11, 14, 23, 0.88);
            backdrop-filter: blur(20px) saturate(1.4);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 4px 40px rgba(0, 0, 0, 0.5);
        }
        .header::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--primary-glow), transparent);
            opacity: 0.6;
        }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            letter-spacing: -0.5px;
        }
        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
            filter: drop-shadow(0 0 12px var(--primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, #fff 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 100px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all var(--transition);
            position: relative;
        }
        .nav a i {
            font-size: 0.85rem;
        }
        .nav a:hover {
            color: #fff;
            background: rgba(0, 240, 255, 0.06);
        }
        .nav a.active {
            color: #fff;
            background: rgba(0, 240, 255, 0.1);
            box-shadow: inset 0 0 0 1px rgba(0, 240, 255, 0.15), 0 0 30px rgba(0, 240, 255, 0.04);
        }
        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            box-shadow: 0 0 12px var(--primary-glow);
        }
        .nav a.nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-weight: 600;
            padding: 8px 22px;
            box-shadow: 0 4px 20px var(--primary-glow);
        }
        .nav a.nav-cta:hover {
            transform: translateY(-1px) scale(1.02);
            box-shadow: 0 8px 32px var(--primary-glow);
            color: #0b0e17;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text-main);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(0, 240, 255, 0.08);
        }

        /* ===== Hero / Banner (内页横幅) ===== */
        .page-banner {
            padding: 120px 0 80px;
            position: relative;
            background: linear-gradient(160deg, #0b0e17 0%, #0f1520 40%, #111827 100%);
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: screen;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.06), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff 20%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .page-banner .banner-desc {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.8;
        }
        .page-banner .banner-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            margin-top: 24px;
            color: var(--text-weak);
            font-size: 0.9rem;
        }
        .page-banner .banner-meta i {
            color: var(--primary);
            margin-right: 6px;
        }

        /* ===== 通用板块间距 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }

        /* ===== 卡片通用 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 32px;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            border-color: rgba(0, 240, 255, 0.2);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .card .card-icon {
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            background: rgba(0, 240, 255, 0.08);
            color: var(--primary);
            font-size: 1.6rem;
            margin-bottom: 18px;
            border: 1px solid rgba(0, 240, 255, 0.1);
        }
        .card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #fff;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
            background: rgba(0, 240, 255, 0.08);
            padding: 4px 12px;
            border-radius: 100px;
            margin-top: 14px;
            border: 1px solid rgba(0, 240, 255, 0.08);
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }

        /* ===== 步骤 / 流程 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 28px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 32px 28px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
            box-shadow: var(--shadow-card);
        }
        .step-item:hover {
            border-color: rgba(0, 240, 255, 0.2);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .step-item .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e17;
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 0 30px var(--primary-glow);
        }
        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== 图文区块 ===== */
        .media-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .media-block .media-content h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: #fff;
        }
        .media-block .media-content p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .media-block .media-content .feature-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 20px;
        }
        .media-block .media-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--text-main);
            font-size: 0.95rem;
        }
        .media-block .media-content .feature-list li i {
            color: var(--primary);
            margin-top: 3px;
            font-size: 1rem;
        }
        .media-block .media-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
        }
        .media-block .media-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 300px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            padding: 0;
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 240, 255, 0.15);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            font-weight: 600;
            color: #fff;
            font-size: 1.05rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(0, 240, 255, 0.03);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.2rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA 区块 ===== */
        .cta-block {
            background: linear-gradient(145deg, #111827, #0f1520);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            padding: 60px 48px;
            text-align: center;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.05), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-block h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-block p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-block .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== 标签 / 徽章 ===== */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            background: rgba(0, 240, 255, 0.06);
            color: var(--primary);
            border: 1px solid rgba(0, 240, 255, 0.1);
        }
        .tag i {
            font-size: 0.7rem;
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .stat-item:hover {
            border-color: rgba(0, 240, 255, 0.15);
            transform: translateY(-2px);
        }
        .stat-item .stat-num {
            font-size: 2.6rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.2;
            text-shadow: 0 0 40px var(--primary-glow);
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* ===== 内容列表 ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-list-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .content-list-item:hover {
            border-color: rgba(0, 240, 255, 0.15);
            transform: translateX(4px);
            box-shadow: var(--shadow-card);
        }
        .content-list-item .cli-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 240, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.3rem;
            flex-shrink: 0;
            border: 1px solid rgba(0, 240, 255, 0.06);
        }
        .content-list-item .cli-text {
            flex: 1;
        }
        .content-list-item .cli-text h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 4px;
        }
        .content-list-item .cli-text p {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .content-list-item .cli-arrow {
            color: var(--text-weak);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .content-list-item:hover .cli-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }

        /* ===== Footer ===== */
        .footer {
            background: #070a12;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 0;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }
        .footer-brand .logo {
            margin-bottom: 12px;
        }
        .footer-brand p {
            color: var(--text-weak);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: var(--text-weak);
            font-size: 0.9rem;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: var(--primary);
            transform: translateX(4px);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            font-size: 0.85rem;
            color: var(--text-weak);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: var(--text-weak);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-banner h1 {
                font-size: 2.4rem;
            }
            .section-title {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .nav {
                display: none;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(11, 14, 23, 0.96);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
                gap: 4px;
            }
            .nav.open {
                display: flex;
            }
            .nav a {
                width: 100%;
                padding: 12px 18px;
                border-radius: var(--radius-sm);
            }
            .nav a.active::after {
                display: none;
            }
            .nav a.nav-cta {
                margin-top: 8px;
                text-align: center;
                justify-content: center;
            }
            .nav-toggle {
                display: block;
            }
            .grid-2,
            .grid-3,
            .media-block {
                grid-template-columns: 1fr;
            }
            .media-block .media-image img {
                min-height: 220px;
            }
            .page-banner {
                padding: 100px 0 60px;
            }
            .page-banner h1 {
                font-size: 2rem;
            }
            .page-banner .banner-desc {
                font-size: 1rem;
            }
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .stat-num {
                font-size: 2rem;
            }
            .cta-block {
                padding: 40px 24px;
            }
            .cta-block h2 {
                font-size: 1.7rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .content-list-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .content-list-item .cli-arrow {
                align-self: flex-end;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .stat-num {
                font-size: 1.7rem;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .card {
                padding: 24px 20px;
            }
            .step-item {
                padding: 24px 20px;
            }
            .cta-block {
                padding: 32px 16px;
            }
            .cta-block h2 {
                font-size: 1.4rem;
            }
            .faq-question {
                padding: 16px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
                font-size: 0.9rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
            .media-block {
                gap: 24px;
            }
        }