/* roulang page: index */
:root {
  --bg-primary: #0B1120;
  --bg-secondary: #111A33;
  --glass-bg: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  --color-primary: #3B82F6;
  --color-primary-hover: #60A5FA;
  --color-accent: #22D3EE;
  --color-accent-dark: #06B6D4;
  --color-warning: #F59E0B;
  --text-primary: #E2E8F0;
  --text-secondary: #94A3B8;
  --text-muted: #475569;
  --border-color: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.16);
  --radius-card: 14px;
  --radius-small: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 12px 32px rgba(0,0,0,0.25);
  --shadow-glow-blue: 0 0 24px rgba(59,130,246,0.35);
  --shadow-glow-cyan: 0 0 32px rgba(34,211,238,0.45);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 44px; padding: 0 24px; border-radius: var(--radius-small);
  font-size: 15px; font-weight: 600; border: none; cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: linear-gradient(to bottom, var(--color-primary), #2563EB); color: #fff; }
.btn-primary:hover { background: linear-gradient(to bottom, var(--color-primary-hover), var(--color-primary)); box-shadow: var(--shadow-glow-blue); }
.btn-energy {
  background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-dark));
  color: var(--bg-primary); font-size: 16px; font-weight: 700; height: 52px; padding: 0 32px;
}
.btn-energy:hover { box-shadow: var(--shadow-glow-cyan); }
.btn-ghost {
  background: transparent; border: 1px solid rgba(255,255,255,0.2); color: var(--text-primary);
  height: 44px; padding: 0 24px; font-size: 15px; font-weight: 600; border-radius: var(--radius-small);
  transition: var(--transition); display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
}
.btn-ghost:hover { border-color: var(--border-hover); background: rgba(255,255,255,0.06); }
.btn-sm { height: 40px; padding: 0 20px; font-size: 14px; }
.btn-lg { height: 56px; padding: 0 40px; font-size: 17px; border-radius: 12px; }
.section { padding: 96px 0; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-title { font-size: 2rem; font-weight: 600; line-height: 1.3; letter-spacing: -0.02em; }
.section-desc { color: var(--text-secondary); max-width: 680px; margin: 16px auto 0; font-size: 1rem; }

/* Header */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 68px; background: rgba(11,17,32,0.7);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.site-header.scrolled { background: rgba(11,17,32,0.85); border-bottom-color: rgba(255,255,255,0.12); }
.header-inner { display: flex; align-items: center; height: 68px; gap: 24px; }
.logo { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.01em; display: flex; align-items: center; gap: 4px; }
.logo span { color: var(--color-accent); }
.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; margin-left: 16px; }
.main-nav a {
  padding: 8px 14px; border-radius: 8px; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); transition: var(--transition); position: relative;
}
.main-nav a:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.main-nav a.active { color: var(--color-accent); }
.main-nav a.active::after { content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%); width: 16px; height: 2px; background: var(--color-accent); border-radius: 2px; }
.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.search-box {
  display: flex; align-items: center; width: 200px; height: 36px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border-color);
  border-radius: 8px; padding: 0 12px; gap: 8px; transition: var(--transition);
  position: relative;
}
.search-box input { background: transparent; border: none; outline: none; color: var(--text-primary); font-size: 13px; width: 100%; }
.search-box input::placeholder { color: var(--text-muted); }
.search-box:focus-within { border-color: var(--color-accent); box-shadow: 0 0 0 4px rgba(34,211,238,0.1); }
.search-hotkey {
  font-size: 11px; color: var(--text-muted); background: rgba(255,255,255,0.08);
  border: 1px solid var(--border-color); border-radius: 4px; padding: 2px 6px;
  white-space: nowrap;
}
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border-color);
  background: rgba(255,255,255,0.04); display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); cursor: pointer; transition: var(--transition);
}
.icon-btn:hover { background: rgba(255,255,255,0.1); color: var(--text-primary); border-color: var(--border-hover); }
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger span { width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }
.mobile-menu {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 999;
  background: rgba(11,17,32,0.95); backdrop-filter: blur(20px);
  flex-direction: column; padding: 90px 24px 32px; opacity: 0; visibility: hidden; transition: all 0.3s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a { color: var(--text-primary); font-size: 1.25rem; font-weight: 600; padding: 16px 0; border-bottom: 1px solid var(--border-color); }
.mobile-menu a.active { color: var(--color-accent); }
.mobile-menu .mobile-bottom { margin-top: auto; display: flex; flex-direction: column; gap: 16px; }

/* Hero */
.hero {
  position: relative; min-height: 92vh; display: flex; align-items: center;
  padding: 140px 0 80px; overflow: hidden;
  background: linear-gradient(180deg, #0B1120 0%, #0D1628 50%, #0B1120 100%);
}
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background-image: linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; top: -120px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 400px; border-radius: 50%;
  background: rgba(34,211,238,0.12); filter: blur(180px); pointer-events: none; z-index: 1;
}
.hero-back {
  position: absolute; inset: 0; z-index: 0; opacity: 0.18;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover; background-position: center;
}
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center; }
.hero-copy { max-width: 560px; }
.hero-title { font-size: clamp(2.5rem, 5vw, 3.5rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 24px; }
.hero-title .highlight { color: var(--color-accent); }
.hero-subtitle { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 36px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 12px; margin-top: 40px; flex-wrap: wrap; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12px;
  color: var(--text-secondary); background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color); border-radius: 30px; padding: 6px 14px;
}
.hero-badge i { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }

/* Terminal Mockup */
.hero-visual { position: relative; }
.terminal-window {
  background: rgba(13,20,36,0.9); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  backdrop-filter: blur(12px);
}
.terminal-header { display: flex; align-items: center; gap: 8px; padding: 14px 16px; background: rgba(255,255,255,0.03); border-bottom: 1px solid var(--border-color); }
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot.red { background: #F87171; }
.terminal-dot.yellow { background: var(--color-warning); }
.terminal-dot.green { background: #34D399; }
.terminal-title { margin-left: 12px; font-size: 12px; color: var(--text-secondary); }
.terminal-body { padding: 24px; font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; color: var(--text-secondary); }
.term-line { margin-bottom: 10px; }
.term-cmd { color: var(--color-accent); margin-right: 8px; }
.term-line.success { color: #34D399; }
.term-bars { display: flex; gap: 8px; align-items: flex-end; height: 90px; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border-color); }
.term-bars span { flex: 1; border-radius: 4px 4px 0 0; background: linear-gradient(to top, rgba(34,211,238,0.3), rgba(34,211,238,0.8)); min-width: 10px; }
.scroll-down {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%); z-index: 3;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: var(--text-secondary); font-size: 12px; cursor: pointer; background: none; border: none;
  transition: var(--transition);
}
.scroll-down:hover { color: var(--text-primary); }
.scroll-down svg { animation: float 2s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(8px); } }

/* Gallery Slider */
.gallery-section { background: var(--bg-primary); position: relative; }
.slider-wrap { position: relative; max-width: 800px; margin: 0 auto; }
.slider-viewport { overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--border-color); }
.slider-track { display: flex; transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1); }
.slide-card { flex: 0 0 100%; min-width: 100%; position: relative; aspect-ratio: 16/9; background: #0D1628; }
.slide-card img { width: 100%; height: 100%; object-fit: cover; opacity: 0.6; }
.slide-overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 32px 24px 24px; background: linear-gradient(to top, rgba(11,17,32,0.95), transparent); }
.slide-overlay h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
.slide-overlay p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.7; max-width: 90%; }
.slider-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border-color);
  background: rgba(17,26,51,0.7); backdrop-filter: blur(8px);
  color: var(--text-primary); font-size: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: var(--transition);
}
.slider-arrow:hover { background: rgba(34,211,238,0.2); border-color: var(--color-accent); }
.slider-arrow.prev { left: -20px; }
.slider-arrow.next { right: -20px; }
.slider-dots { display: flex; justify-content: center; gap: 8px; margin-top: 24px; }
.slider-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-muted); border: none; cursor: pointer; padding: 0; transition: var(--transition); }
.slider-dot.active { background: var(--color-accent); width: 24px; border-radius: 4px; }

/* Specs */
.spec-section { background: var(--bg-secondary); position: relative; }
.spec-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.spec-card {
  background: var(--glass-bg); border: 1px solid var(--border-color);
  border-radius: var(--radius-card); padding: 32px 24px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card); transition: var(--transition);
  text-align: center;
}
.spec-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(0,0,0,0.35); border-color: var(--border-hover); }
.spec-icon { width: 60px; height: 60px; margin: 0 auto 20px; border-radius: var(--radius-lg); background: rgba(34,211,238,0.12); display: flex; align-items: center; justify-content: center; border: 1px solid rgba(34,211,238,0.2); }
.spec-icon svg { width: 28px; height: 28px; color: var(--color-accent); }
.spec-name { font-size: 1.1rem; font-weight: 600; margin-bottom: 16px; }
.spec-item { font-size: 0.875rem; color: var(--text-secondary); padding: 6px 0; border-bottom: 1px dashed var(--border-color); }
.spec-item:last-child { border-bottom: none; }
.spec-item strong { color: var(--text-primary); font-weight: 500; }

/* Reviews */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card {
  background: var(--glass-bg); border: 1px solid var(--border-color);
  border-radius: var(--radius-card); padding: 28px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); border-color: var(--border-hover); }
.review-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; color: #fff;
}
.review-name { font-size: 0.9375rem; font-weight: 600; }
.review-stars { display: flex; gap: 2px; margin-left: auto; color: var(--color-warning); font-size: 14px; }
.review-text { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.7; }

/* Download */
.download-section { background: var(--bg-primary); text-align: center; }
.download-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.download-note { font-size: 14px; color: var(--text-muted); margin-top: 24px; }

/* News */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.post-card {
  background: var(--glass-bg); border: 1px solid var(--border-color);
  border-radius: var(--radius-card); overflow: hidden;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: var(--transition); display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); border-color: var(--border-hover); }
.post-cover { aspect-ratio: 16/9; overflow: hidden; position: relative; }
.post-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.post-card:hover .post-cover img { transform: scale(1.05); }
.post-tag {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  font-size: 12px; color: var(--color-accent); background: rgba(34,211,238,0.15);
  border: 1px solid rgba(34,211,238,0.25); border-radius: 30px; padding: 3px 12px;
  backdrop-filter: blur(4px);
}
.post-body { padding: 20px; display: flex; flex-direction: column; flex: 1; }
.post-title { font-size: 1rem; font-weight: 600; line-height: 1.5; margin-bottom: 8px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.post-excerpt { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 16px; flex: 1; }
.post-meta { display: flex; align-items: center; justify-content: space-between; font-size: 0.75rem; color: var(--text-muted); border-top: 1px solid var(--border-color); padding-top: 12px; }
.read-more { color: var(--color-accent); font-weight: 500; display: inline-flex; align-items: center; gap: 4px; transition: var(--transition); }
.read-more:hover { color: var(--text-primary); }
.empty-state {
  grid-column: 1 / -1; text-align: center; padding: 48px 20px;
  background: var(--glass-bg); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}
.empty-icon { width: 64px; height: 64px; margin: 0 auto 16px; border-radius: var(--radius-lg); background: rgba(255,255,255,0.04); display: flex; align-items: center; justify-content: center; border: 1px solid var(--border-color); }
.empty-state p { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.empty-state span { font-size: 14px; color: var(--text-secondary); }
.news-more { display: block; text-align: center; margin-top: 32px; }

/* CTA Section */
.cta-section { background: linear-gradient(135deg, var(--bg-secondary), #0D1A38); position: relative; overflow: hidden; text-align: center; padding: 80px 0; }
.cta-section::before { content: ''; position: absolute; top: -80px; right: -80px; width: 300px; height: 300px; border-radius: 50%; background: rgba(34,211,238,0.1); filter: blur(100px); }
.cta-title { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }
.cta-desc { font-size: 1rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Footer */
.site-footer { background: #080D18; border-top: 1px solid var(--border-color); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer-brand .logo { margin-bottom: 16px; font-size: 1.25rem; }
.footer-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.7; max-width: 260px; }
.footer-col h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 20px; color: var(--text-primary); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 12px; }
.footer-col a { font-size: 0.875rem; color: var(--text-secondary); transition: var(--transition); }
.footer-col a:hover { color: var(--color-accent); }
.footer-contact-item { display: flex; align-items: center; gap: 10px; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 14px; }
.footer-contact-item svg { width: 16px; height: 16px; color: var(--color-accent); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.8125rem; color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .header-actions .search-box { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-copy { max-width: 100%; text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-badges { justify-content: center; }
  .spec-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .slider-arrow.prev { left: 12px; }
  .slider-arrow.next { right: 12px; }
}
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .section-title { font-size: 1.5rem; }
  .hero { padding: 120px 0 60px; min-height: auto; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 0.9375rem; }
  .site-header { height: 56px; }
  .header-inner { height: 56px; }
  .spec-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .slide-overlay p { max-width: 100%; }
}
@media (max-width: 576px) {
  .container { padding: 0 16px; }
  .header-actions .btn { display: none; }
  .hero-actions .btn { width: 100%; }
  .download-buttons .btn { width: 100%; }
  .cta-actions .btn { width: 100%; }
}

/* roulang page: category1 */
:root {
            --bg-primary: #0B1120;
            --bg-secondary: #111A33;
            --bg-deep: #070C17;
            --glass-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
            --brand-blue: #3B82F6;
            --brand-cyan: #22D3EE;
            --brand-cyan-dark: #06B6D4;
            --brand-amber: #F59E0B;
            --text-primary: #E2E8F0;
            --text-secondary: #94A3B8;
            --text-placeholder: #475569;
            --border-default: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(255, 255, 255, 0.16);
            --radius-card: 14px;
            --radius-small: 10px;
            --radius-tag: 999px;
            --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.25);
            --shadow-glow-blue: 0 0 24px rgba(59, 130, 246, 0.35);
            --shadow-glow-cyan: 0 0 32px rgba(34, 211, 238, 0.45);
            --spacing-section: 96px;
            --spacing-section-mobile: 64px;
            --container-width: 1200px;
            --header-height: 68px;
            --header-height-mobile: 56px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            display: block;
            aspect-ratio: 16 / 9;
            object-fit: cover;
        }

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

        button {
            cursor: pointer;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 32px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            z-index: 1000;
            background: rgba(11, 17, 32, 0.6);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-default);
            transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            background: rgba(11, 17, 32, 0.85);
            border-bottom-color: rgba(255, 255, 255, 0.1);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 24px;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            letter-spacing: 0.01em;
            display: flex;
            align-items: center;
            gap: 2px;
        }

        .logo span {
            color: var(--brand-cyan);
            font-weight: 600;
            font-size: 1.1rem;
            text-transform: lowercase;
        }

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

        .main-nav a {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color var(--transition), background var(--transition);
            position: relative;
        }

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

        .main-nav a.active {
            color: var(--brand-cyan);
            font-weight: 600;
        }

        .main-nav a.active::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 2px;
            height: 2px;
            background: var(--brand-cyan);
            border-radius: 2px;
            box-shadow: 0 0 8px rgba(34, 211, 238, 0.6);
        }

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

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            height: 36px;
            width: 200px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-default);
            border-radius: 8px;
            padding: 0 10px;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .search-box:focus-within {
            border-color: rgba(34, 211, 238, 0.5);
            box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.1);
        }

        .search-box svg {
            width: 14px;
            height: 14px;
            stroke: var(--text-placeholder);
            flex-shrink: 0;
        }

        .search-box input {
            flex: 1;
            background: transparent;
            border: none;
            font-size: 0.8rem;
            color: var(--text-primary);
            min-width: 0;
        }

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

        .search-box kbd {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid var(--border-default);
            border-radius: 5px;
            font-size: 0.68rem;
            padding: 2px 5px;
            color: var(--text-secondary);
            font-family: var(--font-stack);
            white-space: nowrap;
            line-height: 1.2;
        }

        .icon-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-default);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background var(--transition), border-color var(--transition);
            flex-shrink: 0;
        }

        .icon-btn:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--border-hover);
        }

        .icon-btn svg {
            width: 16px;
            height: 16px;
            stroke: var(--text-secondary);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: 10px;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 0 24px;
            height: 44px;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
            white-space: nowrap;
        }

        .btn:active {
            transform: scale(0.98);
        }

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

        .btn-primary {
            background: linear-gradient(135deg, var(--brand-blue), #2563EB);
            color: #fff;
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #60A5FA, var(--brand-blue));
            box-shadow: var(--shadow-glow-blue);
        }

        .btn-energy {
            background: linear-gradient(135deg, #22D3EE, #06B6D4);
            color: var(--bg-primary);
            font-weight: 700;
            font-size: 1rem;
            height: 52px;
            padding: 0 28px;
        }

        .btn-energy:hover {
            box-shadow: var(--shadow-glow-cyan);
        }

        .btn-ghost {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--text-primary);
        }

        .btn-ghost:hover {
            border-color: rgba(255, 255, 255, 0.4);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-cta {
            height: 36px;
            font-size: 0.85rem;
            padding: 0 18px;
            background: linear-gradient(135deg, #22D3EE, #06B6D4);
            color: var(--bg-primary);
            font-weight: 700;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: box-shadow var(--transition), transform var(--transition);
        }

        .nav-cta:hover {
            box-shadow: var(--shadow-glow-cyan);
        }

        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-default);
            align-items: center;
            justify-content: center;
        }

        .menu-toggle svg {
            width: 20px;
            height: 20px;
            stroke: var(--text-primary);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(7, 12, 23, 0.98);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 999;
            padding: calc(var(--header-height-mobile) + 20px) 24px 24px;
            flex-direction: column;
            gap: 16px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }

        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
        }

        .mobile-menu nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
            flex: 1;
            overflow-y: auto;
        }

        .mobile-menu nav a {
            font-size: 1.2rem;
            font-weight: 600;
            padding: 16px 20px;
            border-radius: 12px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-default);
            transition: background var(--transition), border-color var(--transition);
        }

        .mobile-menu nav a:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: var(--border-hover);
        }

        .mobile-menu nav a.active {
            color: var(--brand-cyan);
            border-color: rgba(34, 211, 238, 0.3);
            background: rgba(34, 211, 238, 0.08);
        }

        .mobile-menu-actions {
            display: flex;
            flex-direction: column;
            gap: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--border-default);
        }

        .mobile-menu-actions .search-box {
            width: 100%;
            height: 44px;
        }

        .mobile-menu-actions .btn {
            width: 100%;
        }

        .page-hero {
            position: relative;
            padding: calc(var(--header-height) + 64px) 0 64px;
            overflow: hidden;
            min-height: 480px;
            display: flex;
            align-items: center;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.5;
            z-index: 0;
        }

        .hero-bg::after {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(34, 211, 238, 0.12) 0%, transparent 60%),
                linear-gradient(180deg, rgba(11, 17, 32, 0.8) 0%, var(--bg-primary) 100%);
        }

        .hero-grid-overlay {
            position: absolute;
            inset: 0;
            z-index: 1;
            background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
            background-size: 44px 44px;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            background: rgba(34, 211, 238, 0.12);
            border: 1px solid rgba(34, 211, 238, 0.25);
            border-radius: var(--radius-tag);
            color: var(--brand-cyan);
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 20px;
        }

        .hero-content h1 {
            font-size: clamp(2.2rem, 4.5vw, 3.2rem);
            font-weight: 700;
            line-height: 1.22;
            margin-bottom: 20px;
            letter-spacing: -0.01em;
            color: var(--text-primary);
        }

        .hero-subtitle {
            font-size: 1.05rem;
            line-height: 1.75;
            color: var(--text-secondary);
            max-width: 620px;
            margin-bottom: 32px;
        }

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

        .section {
            padding: var(--spacing-section) 0;
        }

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

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
        }

        .section-header p {
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
            font-size: 0.95rem;
            line-height: 1.7;
        }

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

        .feature-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.5), transparent);
            opacity: 0;
            transition: opacity var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
        }

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

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(34, 211, 238, 0.12);
            border: 1px solid rgba(34, 211, 238, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }

        .feature-icon svg {
            width: 22px;
            height: 22px;
            stroke: var(--brand-cyan);
        }

        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

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

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

        .scenario-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            transition: transform var(--transition), border-color var(--transition);
        }

        .scenario-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
        }

        .scenario-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            background: rgba(59, 130, 246, 0.15);
            border: 1px solid rgba(59, 130, 246, 0.2);
            color: #60A5FA;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            margin-bottom: 16px;
        }

        .scenario-card h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

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

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

        .content-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }

        .content-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
        }

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

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

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

        .content-card-img::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, rgba(11, 17, 32, 0.4));
        }

        .content-card-body {
            padding: 20px;
        }

        .content-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            background: rgba(34, 211, 238, 0.15);
            border: 1px solid rgba(34, 211, 238, 0.2);
            color: var(--brand-cyan);
            font-size: 0.7rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .content-card h3 {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .content-card .excerpt {
            font-size: 0.825rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
        }

        .content-card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.75rem;
            color: var(--text-placeholder);
            padding-top: 12px;
            border-top: 1px solid var(--border-default);
        }

        .content-card-footer a {
            color: var(--brand-cyan);
            font-weight: 600;
            font-size: 0.75rem;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }

        .content-card-footer a:hover {
            gap: 8px;
        }

        .faq-section {
            padding: var(--spacing-section) 0;
        }

        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--glass-bg);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-default);
            border-radius: 12px;
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color var(--transition);
        }

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

        .faq-item.open {
            border-color: rgba(34, 211, 238, 0.3);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            padding: 18px 24px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            transition: color var(--transition);
        }

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

        .faq-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            position: relative;
        }

        .faq-icon::before,
        .faq-icon::after {
            content: "";
            position: absolute;
            background: var(--text-secondary);
            border-radius: 2px;
            transition: background var(--transition), transform 0.3s ease;
        }

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

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

        .faq-item.open .faq-icon::before {
            transform: rotate(180deg);
            background: var(--brand-cyan);
        }

        .faq-item.open .faq-icon::after {
            transform: rotate(90deg);
            opacity: 0;
        }

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

        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.8;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            padding-top: 16px;
        }

        .cta-section {
            padding: 88px 0;
            position: relative;
            overflow: hidden;
            background: radial-gradient(ellipse at 50% 30%, rgba(34, 211, 238, 0.12) 0%, transparent 70%);
            border-top: 1px solid var(--border-default);
        }

        .cta-inner {
            max-width: 640px;
            margin: 0 auto;
            text-align: center;
        }

        .cta-inner h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-inner p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .cta-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 60px 0 32px;
        }

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

        .footer-brand .logo {
            margin-bottom: 14px;
            font-size: 1.2rem;
        }

        .footer-desc {
            font-size: 0.825rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 240px;
        }

        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.05em;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col ul li a {
            font-size: 0.825rem;
            color: var(--text-secondary);
            transition: color var(--transition);
        }

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

        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.825rem;
            color: var(--text-secondary);
            margin-bottom: 12px;
        }

        .footer-contact-item svg {
            width: 16px;
            height: 16px;
            stroke: var(--brand-cyan);
            flex-shrink: 0;
            opacity: 0.8;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            font-size: 0.75rem;
            color: var(--text-placeholder);
            flex-wrap: wrap;
            gap: 8px;
        }

        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }

            .search-box {
                width: 160px;
            }

            .main-nav a {
                padding: 8px 10px;
                font-size: 0.85rem;
            }

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

        @media (max-width: 768px) {
            :root {
                --header-height: var(--header-height-mobile);
                --spacing-section: var(--spacing-section-mobile);
            }

            .nav-container {
                gap: 12px;
            }

            .main-nav,
            .search-box,
            .icon-btn {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .nav-cta {
                display: none;
            }

            .page-hero {
                padding: calc(var(--header-height-mobile) + 48px) 0 48px;
                min-height: auto;
            }

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

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

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

            .feature-grid,
            .scenario-grid,
            .content-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .section-header {
                margin-bottom: 32px;
            }

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

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

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

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

        @media (max-width: 576px) {
            .container {
                padding: 0 16px;
            }

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

            .nav-actions {
                gap: 8px;
            }

            .content-card-body {
                padding: 16px;
            }

            .faq-question {
                padding: 16px;
                font-size: 0.875rem;
            }

            .faq-answer-inner {
                padding: 0 16px 16px;
            }
        }

/* roulang page: article */
:root {
  --bg-primary: #0B1120;
  --bg-secondary: #111A33;
  --bg-deep: #060B16;
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --glass-border-hover: rgba(255,255,255,0.16);
  --primary: #3B82F6;
  --primary-dark: #2563EB;
  --primary-light: #60A5FA;
  --accent: #22D3EE;
  --accent-dark: #06B6D4;
  --warning: #F59E0B;
  --text-primary: #E2E8F0;
  --text-secondary: #94A3B8;
  --text-muted: #475569;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --shadow: 0 12px 32px rgba(0,0,0,0.25);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }
ul, ol { list-style-position: inside; }
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-xs);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  white-space: nowrap;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(59,130,246,0.18);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  box-shadow: 0 0 24px rgba(59,130,246,0.35);
  transform: translateY(-1px);
}
.btn-primary:active { transform: scale(0.98); }
.btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn-energy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 52px;
  padding: 0 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--bg-primary);
  font-size: 16px;
  font-weight: 700;
  border: none;
  white-space: nowrap;
  transition: all var(--transition);
  box-shadow: 0 6px 20px rgba(34,211,238,0.25);
}
.btn-energy:hover {
  box-shadow: 0 0 32px rgba(34,211,238,0.45);
  transform: translateY(-2px);
}
.btn-energy:active { transform: scale(0.98); }
.btn-energy:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-xs);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  transition: all var(--transition);
}
.btn-ghost:hover {
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.06);
}
.btn-ghost:active { transform: scale(0.98); }
.btn-ghost:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 68px;
  z-index: 100;
  background: rgba(11,17,32,0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  background: rgba(11,17,32,0.85);
  border-bottom-color: rgba(255,255,255,0.08);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: baseline;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.logo span {
  color: var(--accent);
  font-size: 15px;
  font-weight: 600;
  margin-left: 4px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}
.main-nav a:hover { color: var(--text-primary); }
.main-nav a.active {
  color: var(--accent);
}
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 200px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-xs);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(34,211,238,0.12);
}
.search-box svg {
  width: 15px;
  height: 15px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.search-box input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 13px;
  min-width: 0;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box .kbd {
  font-size: 11px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  padding: 2px 6px;
  border: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
  line-height: 1.4;
}
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-secondary);
  transition: all 0.2s ease;
}
.icon-btn:hover {
  background: rgba(255,255,255,0.12);
  color: var(--text-primary);
}
.icon-btn svg { width: 17px; height: 17px; }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
}
.menu-toggle svg { width: 20px; height: 20px; }
.menu-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(11,17,32,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  padding-top: 68px;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}
.mobile-menu-inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 32px 32px 40px;
  overflow-y: auto;
}
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.mobile-nav a {
  display: block;
  padding: 14px 16px;
  font-size: 17px;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: background 0.2s ease, color 0.2s ease;
}
.mobile-nav a:hover { background: rgba(255,255,255,0.06); }
.mobile-nav a.active {
  background: rgba(34,211,238,0.1);
  color: var(--accent);
}
.mobile-menu-footer {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.mobile-search {
  width: 100%;
}
.mobile-menu-footer .btn-primary {
  width: 100%;
  height: 50px;
}
/* Read progress */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  z-index: 200;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  transition: width 0.1s linear;
}
/* Article hero */
.article-hero {
  position: relative;
  padding: 150px 0 56px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(34,211,238,0.12), transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(59,130,246,0.08), transparent 50%),
    var(--bg-primary);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { opacity: 0.6; }
.breadcrumb .current {
  color: var(--text-secondary);
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.article-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 20px;
  max-width: 880px;
  letter-spacing: 0.5px;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}
.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta .meta-sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-muted);
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  height: 26px;
  border-radius: 13px;
  background: rgba(34,211,238,0.15);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid rgba(34,211,238,0.2);
}
/* Article layout */
.article-layout {
  padding: 56px 0 80px;
  max-width: 1000px;
}
.article-main {
  max-width: 720px;
  margin: 0 auto;
}
.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  word-wrap: break-word;
}
.article-content > * + * { margin-top: 24px; }
.article-content h2 {
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 48px;
  color: var(--text-primary);
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.article-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 36px;
  color: var(--text-primary);
}
.article-content h2:first-child, .article-content h3:first-child { margin-top: 0; }
.article-content p {
  color: var(--text-primary);
}
.article-content a {
  color: var(--primary-light);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}
.article-content a:hover { color: var(--accent); }
.article-content blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(34,211,238,0.06);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-size: 15px;
}
.article-content code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  background: rgba(255,255,255,0.08);
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 14px;
  color: var(--accent);
}
.article-content pre {
  background: var(--bg-deep);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  padding: 24px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.7;
}
.article-content pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
}
.article-content ul, .article-content ol {
  padding-left: 8px;
}
.article-content li {
  padding-left: 8px;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.article-content ul li::marker {
  color: var(--accent);
}
.article-content ol li::marker {
  color: var(--accent);
  font-weight: 600;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-size: 15px;
}
.article-content th {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border: 1px solid rgba(255,255,255,0.08);
}
.article-content td {
  padding: 12px 16px;
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--text-secondary);
}
.article-content img {
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
  width: 100%;
  height: auto;
}
.article-content figure {
  margin: 32px 0;
}
.article-content figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 12px;
}
/* Article empty state */
.article-empty {
  text-align: center;
  padding: 80px 32px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
}
.empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  border-radius: 16px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}
.empty-icon svg {
  width: 28px;
  height: 28px;
  color: var(--text-secondary);
}
.article-empty h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.article-empty p {
  color: var(--text-secondary);
  margin-bottom: 28px;
}
/* Related section */
.related-section {
  padding: 72px 0 16px;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.section-title {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 40px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  height: 100%;
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.16);
  box-shadow: var(--shadow);
}
.related-card .card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  position: relative;
}
.related-card .card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.related-card:hover .card-img img { transform: scale(1.05); }
.related-card .card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px;
}
.related-card .card-tag {
  font-size: 12px;
  color: var(--accent);
  background: rgba(34,211,238,0.12);
  border-radius: 12px;
  padding: 3px 12px;
  display: inline-block;
  width: fit-content;
  margin-bottom: 12px;
  font-weight: 500;
}
.related-card .card-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.related-card .card-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.related-card .card-link {
  margin-top: 16px;
  font-size: 14px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease;
  font-weight: 500;
}
.related-card .card-link:hover { gap: 8px; }
.related-card .card-link svg {
  width: 14px;
  height: 14px;
}
/* Article pagination */
.article-pagination {
  padding: 56px 0 0;
  margin-top: 72px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.page-prev, .page-next {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  transition: all 0.2s ease;
}
.page-prev:hover, .page-next:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.14);
}
.page-prev .label, .page-next .label {
  font-size: 12px;
  color: var(--text-muted);
}
.page-prev .text, .page-next .text {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.page-next { text-align: right; }
.back-btn-wrap {
  display: flex;
  justify-content: center;
  margin-top: 32px;
}
/* CTA section */
.cta-section {
  position: relative;
  padding: 88px 0;
  margin-top: 80px;
  background:
    linear-gradient(rgba(11,17,32,0.88), rgba(11,17,32,0.92)),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}
.cta-inner {
  max-width: 720px;
  margin: 0 auto;
}
.cta-section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}
.cta-section .cta-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo {
  font-size: 22px;
  margin-bottom: 16px;
  display: inline-flex;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 14px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 12px;
}
.footer-col a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 14px;
}
.footer-contact-item svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}
/* Responsive */
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .search-box { display: none; }
  .icon-btn { display: none; }
  .menu-toggle { display: flex; }
  .header-cta { display: none; }
  .related-grid { gap: 20px; }
}
@media (max-width: 768px) {
  .container { padding: 0 24px; }
  .article-hero { padding: 130px 0 44px; }
  .article-layout { padding: 40px 0 56px; }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cta-section {
    padding: 64px 24px;
    margin-top: 56px;
  }
  .article-pagination {
    flex-direction: column;
    align-items: stretch;
  }
  .page-next { text-align: left; }
  .back-btn-wrap { margin-top: 20px; }
}
@media (max-width: 576px) {
  .container { padding: 0 16px; }
  .site-header { height: 56px; }
  .header-inner { height: 56px; }
  .logo { font-size: 17px; }
  .logo span { font-size: 13px; }
  .article-hero { padding: 110px 0 36px; }
  .article-hero h1 { font-size: 1.6rem; }
  .article-meta { font-size: 13px; gap: 8px 12px; }
  .related-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-energy, .btn-ghost {
    width: 100%;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .article-content h2 { font-size: 1.4rem; }
  .article-content h3 { font-size: 1.2rem; }
}

/* roulang page: category2 */
:root {
  --bg-primary: #0B1120;
  --bg-secondary: #111A33;
  --bg-deep: #080D1A;
  --glass-base: rgba(255, 255, 255, 0.04);
  --glass-high: rgba(255, 255, 255, 0.08);
  --brand-blue: #3B82F6;
  --brand-blue-deep: #2563EB;
  --brand-cyan: #22D3EE;
  --brand-cyan-deep: #06B6D4;
  --accent-amber: #F59E0B;
  --text-primary: #E2E8F0;
  --text-secondary: #94A3B8;
  --text-muted: #475569;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);
  --radius-card: 14px;
  --radius-small: 10px;
  --radius-tag: 999px;
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.25);
  --shadow-glow-blue: 0 0 24px rgba(59, 130, 246, 0.35);
  --shadow-glow-cyan: 0 0 32px rgba(34, 211, 238, 0.45);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --header-height: 68px;
  --space-section: 96px;
  --space-section-mobile: 64px;
  --space-card: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--text-primary);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
  width: 100%;
}

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

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

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

button {
  font-family: var(--font-family);
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(11, 17, 32, 0.55);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.4s ease, border-color 0.4s ease;
}

.site-header.scrolled {
  background: rgba(11, 17, 32, 0.85);
  border-bottom-color: rgba(255, 255, 255, 0.12);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.logo span {
  color: var(--brand-cyan);
  font-weight: 600;
  font-size: 1rem;
  margin-left: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.main-nav a {
  position: relative;
  font-size: 0.925rem;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 2px;
  transition: color 0.25s ease;
}

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

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--brand-cyan);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}

.main-nav a.active {
  color: var(--text-primary);
}

.main-nav a.active::after,
.main-nav a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 200px;
  height: 36px;
  padding: 0 10px 0 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-small);
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: text;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--brand-cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.15);
  background: rgba(255, 255, 255, 0.06);
}

.search-box svg {
  width: 14px;
  height: 14px;
  stroke: var(--text-muted);
  flex-shrink: 0;
}

.search-box .search-placeholder {
  flex: 1;
  white-space: nowrap;
}

.search-box kbd {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.7rem;
  font-family: var(--font-family);
  color: var(--text-secondary);
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.1);
}

.icon-btn svg {
  width: 16px;
  height: 16px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.05);
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(8, 13, 26, 0.96);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 24px 40px;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
}

.mobile-menu.open {
  transform: translateY(0);
}

.mobile-menu .main-nav {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.mobile-menu .main-nav a {
  font-size: 1.15rem;
  padding: 14px 0;
  width: 100%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.mobile-menu .main-nav a.active {
  color: var(--brand-cyan);
}

.mobile-menu-actions {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-menu .search-box {
  width: 100%;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-small);
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-blue-deep));
  color: #fff;
  border: none;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #60A5FA, var(--brand-blue));
  box-shadow: var(--shadow-glow-blue);
}

.btn-energy {
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-cyan-deep));
  color: var(--bg-primary);
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
}

.btn-energy:hover {
  box-shadow: var(--shadow-glow-cyan);
  filter: brightness(1.08);
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.06);
}

.btn-lg {
  height: 52px;
  padding: 0 36px;
  font-size: 1rem;
}

header .btn-energy {
  height: 40px;
  padding: 0 20px;
  font-size: 0.88rem;
}

/* Hero */
.page-hero {
  position: relative;
  padding: calc(var(--header-height) + 96px) 0 72px;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 17, 32, 0.92), rgba(17, 26, 51, 0.78)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  z-index: -2;
}

.page-hero::after {
  content: "";
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 420px;
  background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.16), transparent 65%);
  z-index: -1;
  pointer-events: none;
}

.page-hero .breadcrumb {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-hero .breadcrumb span {
  color: var(--text-muted);
}

.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 20px;
  max-width: 720px;
}

.page-hero .hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 680px;
  margin-bottom: 36px;
}

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

/* Section global */
.main-section {
  padding: var(--space-section) 0;
  position: relative;
}

.main-section .section-header {
  margin-bottom: 48px;
  text-align: center;
}

.main-section h2 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.section-header .section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 12px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* Feature grid */
.feature-section {
  padding: var(--space-section) 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-card);
}

.feature-card {
  padding: 32px 24px;
  background: linear-gradient(135deg, var(--glass-high), var(--glass-base));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand-cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
  border-color: var(--border-hover);
}

.feature-card:hover::before {
  opacity: 0.6;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-cyan);
  margin-bottom: 18px;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

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

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* Scenario section */
.scenario-section {
  padding: var(--space-section) 0;
  background: linear-gradient(180deg, rgba(17, 26, 51, 0.4), rgba(17, 26, 51, 0.1));
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-card);
}

.scenario-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  transition: all var(--transition);
}

.scenario-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.scenario-card .scenario-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-tag);
  padding: 3px 12px;
  margin-bottom: 14px;
  font-weight: 500;
}

.scenario-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.scenario-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* Steps */
.steps-section {
  padding: var(--space-section) 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  counter-reset: step;
}

.step-item {
  position: relative;
  padding: 28px 20px;
  text-align: center;
  background: rgba(255, 255, 255, 0.025);
  border-radius: var(--radius-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all 0.3s ease;
}

.step-item:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.045);
}

.step-number {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(34, 211, 238, 0.2));
  border: 1px solid rgba(34, 211, 238, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--brand-cyan);
}

.step-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Guide cards */
.guide-section {
  padding: var(--space-section) 0;
  background: linear-gradient(180deg, transparent, rgba(17, 26, 51, 0.35), transparent);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-card);
}

.guide-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  border-color: var(--border-hover);
}

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

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

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

.guide-card-cover .guide-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(34, 211, 238, 0.2);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(34, 211, 238, 0.25);
  color: var(--brand-cyan);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 12px;
  border-radius: var(--radius-tag);
}

.guide-card-body {
  padding: 20px 22px 24px;
}

.guide-card-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.guide-card-body .guide-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.guide-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-cyan);
}

.guide-more svg {
  width: 14px;
  height: 14px;
  transition: transform 0.3s ease;
}

.guide-card:hover .guide-more svg {
  transform: translateX(4px);
}

/* FAQ */
.faq-section {
  padding: var(--space-section) 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease, background 0.3s ease;
}

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

.faq-item.open {
  border-color: rgba(34, 211, 238, 0.25);
  background: rgba(255, 255, 255, 0.045);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 22px;
  min-height: 56px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  text-align: left;
  transition: color 0.3s ease;
}

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

.faq-icon {
  position: relative;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.faq-icon::before {
  width: 2px;
  height: 18px;
  top: 0;
  left: 8px;
}

.faq-icon::after {
  width: 18px;
  height: 2px;
  top: 8px;
  left: 0;
}

.faq-item.open .faq-icon::before {
  transform: rotate(90deg);
  opacity: 0;
}

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

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

.faq-answer-inner {
  padding: 0 22px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* CTA */
.cta-section {
  padding: 80px 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(17, 26, 51, 0.9), rgba(11, 17, 32, 0.9)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-top: 1px solid var(--border-subtle);
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 640px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(34, 211, 238, 0.14), transparent 65%);
  pointer-events: none;
}

.cta-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 14px;
}

.cta-inner p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Footer */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 32px;
}

.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  font-size: 1.25rem;
  margin-bottom: 14px;
}

.footer-brand .logo span {
  font-size: 0.95rem;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

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

.footer-col ul a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.25s ease;
}

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

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.footer-contact-item svg {
  width: 16px;
  height: 16px;
  color: var(--brand-cyan);
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .container {
    padding: 0 24px;
  }

  .main-nav {
    gap: 18px;
  }

  .search-box {
    width: 160px;
  }

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

  .steps-grid {
    gap: 20px;
  }

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
    --space-section: 64px;
  }

  .container {
    padding: 0 20px;
  }

  .main-nav {
    display: none;
  }

  .search-box {
    display: none;
  }

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

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

  .nav-toggle {
    display: flex;
  }

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

  .mobile-menu .main-nav {
    display: flex;
  }

  .page-hero {
    padding: calc(var(--header-height) + 60px) 0 48px;
  }

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

  .page-hero .hero-subtitle {
    font-size: 0.95rem;
  }

  .main-section .section-header {
    margin-bottom: 32px;
  }

  .main-section h2 {
    font-size: 1.5rem;
  }

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

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

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

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

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

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 16px;
  }

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

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

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .cta-buttons .btn {
    width: 100%;
  }
}

@media (min-width: 1280px) {
  .container {
    padding: 0;
  }
}

/* roulang page: category3 */
:root {
            --bg-primary: #0B1120;
            --bg-secondary: #111A33;
            --bg-footer: #080D1A;
            --accent: #3B82F6;
            --accent-hover: #60A5FA;
            --accent-dark: #2563EB;
            --energy: #22D3EE;
            --energy-dark: #06B6D4;
            --amber: #F59E0B;
            --text-primary: #E2E8F0;
            --text-secondary: #94A3B8;
            --text-muted: #475569;
            --border: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(255, 255, 255, 0.16);
            --radius-card: 14px;
            --radius-sm: 8px;
            --radius-md: 10px;
            --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.25);
            --space-section: 96px;
            --space-section-mobile: 64px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            display: block;
            max-width: 100%;
        }
        button,
        input {
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
        }
        ul {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-md);
            font-size: 0.875rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            white-space: nowrap;
            border: none;
        }
        .btn:focus-visible {
            outline: 2px solid var(--energy);
            outline-offset: 3px;
        }
        .btn-energy {
            background: linear-gradient(135deg, var(--energy), var(--energy-dark));
            color: #0B1120;
            font-weight: 700;
        }
        .btn-energy:hover {
            box-shadow: 0 0 32px rgba(34, 211, 238, 0.45);
            transform: translateY(-1px);
        }
        .btn-energy:active {
            transform: scale(0.98);
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--accent-hover), var(--accent));
            box-shadow: 0 0 24px rgba(59, 130, 246, 0.35);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-ghost {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--text-primary);
        }
        .btn-ghost:hover {
            border-color: rgba(255, 255, 255, 0.4);
            background: rgba(255, 255, 255, 0.06);
        }
        .btn-ghost:active {
            transform: scale(0.98);
        }
        .btn-lg {
            height: 52px;
            padding: 0 36px;
            font-size: 1rem;
            border-radius: 12px;
        }
        .btn-sm {
            height: 40px;
            padding: 0 16px;
            font-size: 0.8125rem;
            border-radius: 8px;
        }

        /* ===== Header ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 68px;
            background: rgba(11, 17, 32, 0.72);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            transition: background 0.3s, box-shadow 0.3s;
        }
        .site-header.scrolled {
            background: rgba(11, 17, 32, 0.88);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            border-bottom-color: rgba(255, 255, 255, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 24px;
        }
        .logo {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 2px;
            letter-spacing: 0.01em;
        }
        .logo span {
            color: var(--energy);
            font-weight: 600;
            margin-left: 2px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            font-size: 0.875rem;
            color: var(--text-secondary);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.2s, background 0.2s;
            font-weight: 500;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .main-nav a.active {
            color: var(--energy);
            background: rgba(34, 211, 238, 0.1);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            height: 36px;
            width: 200px;
            padding: 0 10px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border);
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .search-box:focus-within {
            border-color: var(--energy);
            box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.12);
        }
        .search-box svg {
            width: 14px;
            height: 14px;
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .search-box input {
            flex: 1;
            background: none;
            color: var(--text-primary);
            font-size: 0.8125rem;
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box kbd {
            font-family: inherit;
            font-size: 0.6875rem;
            color: var(--text-muted);
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 1px 5px;
            background: rgba(255, 255, 255, 0.04);
            white-space: nowrap;
        }
        .icon-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.2s;
        }
        .icon-btn:hover {
            color: var(--text-primary);
            border-color: var(--border-hover);
            background: rgba(255, 255, 255, 0.1);
        }
        .icon-btn svg {
            width: 16px;
            height: 16px;
        }
        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 5px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border);
            cursor: pointer;
            transition: background 0.2s;
        }
        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .menu-toggle span {
            width: 18px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
            display: block;
        }
        .menu-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ===== Mobile Menu ===== */
        .mobile-menu {
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 17, 32, 0.97);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 999;
            padding: 32px 24px 40px;
            display: flex;
            flex-direction: column;
            transform: translateX(100%);
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            visibility: hidden;
            overflow-y: auto;
        }
        .mobile-menu.open {
            transform: translateX(0);
            visibility: visible;
        }
        .mobile-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }
        .mobile-nav a {
            display: flex;
            align-items: center;
            padding: 14px 16px;
            border-radius: 12px;
            font-size: 1rem;
            color: var(--text-secondary);
            transition: background 0.2s, color 0.2s;
            font-weight: 500;
        }
        .mobile-nav a:hover {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-primary);
        }
        .mobile-nav a.active {
            color: var(--energy);
            background: rgba(34, 211, 238, 0.1);
        }
        .mobile-bottom {
            padding-top: 24px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .mobile-bottom .search-box {
            width: 100%;
            height: 44px;
        }
        .mobile-bottom .btn {
            width: 100%;
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            padding: 160px 0 72px;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            text-align: center;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 17, 32, 0.68) 0%, rgba(11, 17, 32, 0.88) 100%);
            z-index: 1;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 44px 44px;
            z-index: 0;
        }
        .page-hero .hero-glow {
            position: absolute;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.25), transparent 70%);
            top: 5%;
            left: 50%;
            transform: translateX(-50%);
            z-index: 0;
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border-radius: 24px;
            background: rgba(34, 211, 238, 0.1);
            border: 1px solid rgba(34, 211, 238, 0.2);
            color: var(--energy);
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 20px;
        }
        .page-hero h1 {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 20px;
            color: #fff;
            letter-spacing: -0.01em;
        }
        .page-hero h1 .highlight {
            color: var(--energy);
        }
        .hero-sub {
            max-width: 760px;
            margin: 0 auto 32px;
            font-size: 0.9375rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .hero-badges {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            border-radius: 24px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border);
            font-size: 0.75rem;
            color: var(--text-secondary);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
        .badge svg {
            width: 14px;
            height: 14px;
            color: var(--energy);
        }

        /* ===== Category Tabs ===== */
        .tabs-section {
            padding: 32px 0 0;
            position: relative;
            z-index: 5;
            margin-top: -24px;
        }
        .category-tabs {
            display: flex;
            justify-content: center;
            gap: 8px;
            flex-wrap: wrap;
            background: rgba(17, 26, 51, 0.8);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 8px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
            max-width: fit-content;
            margin: 0 auto;
        }
        .category-tabs a {
            padding: 10px 20px;
            border-radius: 10px;
            font-size: 0.8125rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all 0.2s;
            white-space: nowrap;
        }
        .category-tabs a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .category-tabs a.active {
            background: rgba(34, 211, 238, 0.12);
            color: var(--energy);
        }

        /* ===== Section ===== */
        .section {
            padding: var(--space-section) 0;
        }
        .section-alt {
            background: var(--bg-secondary);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: rgba(34, 211, 238, 0.12);
            color: var(--energy);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-primary);
            letter-spacing: -0.01em;
        }
        .section-header p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 12px auto 0;
            font-size: 0.9375rem;
            line-height: 1.7;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card {
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-card);
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s, border-color 0.3s;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
            border-color: var(--border-hover);
        }
        .card-cover {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-secondary);
        }
        .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card:hover .card-cover img {
            transform: scale(1.05);
        }
        .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            display: inline-flex;
            align-items: center;
            height: 22px;
            padding: 0 10px;
            border-radius: 20px;
            background: rgba(11, 17, 32, 0.75);
            color: var(--energy);
            font-size: 0.6875rem;
            font-weight: 600;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(34, 211, 238, 0.2);
            z-index: 1;
        }
        .card-body {
            padding: 20px 20px 16px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 1.0625rem;
            font-weight: 600;
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            margin-bottom: 8px;
            line-height: 1.4;
            transition: color 0.2s;
        }
        .card-link:hover h3 {
            color: var(--energy);
        }
        .card-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
            margin-bottom: 14px;
        }
        .card-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-top: 12px;
            border-top: 1px solid var(--border);
            font-size: 0.75rem;
            color: var(--text-muted);
        }
        .card-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            color: var(--energy);
            font-weight: 600;
            font-size: 0.8125rem;
            transition: gap 0.2s;
        }
        .card-link svg {
            width: 14px;
            height: 14px;
            transition: transform 0.2s;
        }
        .card-link:hover {
            gap: 8px;
        }
        .card-link:hover svg {
            transform: translateX(2px);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            transition: border-color 0.3s, transform 0.3s;
            position: relative;
        }
        .step-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-2px);
        }
        .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(59, 130, 246, 0.15));
            color: var(--energy);
            font-size: 1.25rem;
            font-weight: 700;
            margin: 0 auto 16px;
            border: 1px solid rgba(34, 211, 238, 0.2);
        }
        .step-card h3 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.8125rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-block {
            text-align: center;
            padding: 36px 20px;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            transition: border-color 0.3s, transform 0.3s;
        }
        .stat-block:hover {
            border-color: var(--border-hover);
            transform: translateY(-2px);
        }
        .stat-num {
            font-size: 2.25rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--energy), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-top: 8px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.2s;
        }
        .faq-item:hover {
            border-color: var(--border-hover);
        }
        .faq-item.active {
            border-color: rgba(34, 211, 238, 0.3);
        }
        .faq-question {
            width: 100%;
            min-height: 52px;
            padding: 16px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            text-align: left;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-primary);
            cursor: pointer;
            transition: background 0.2s, color 0.2s;
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        .faq-item.active .faq-question {
            color: var(--energy);
        }
        .faq-icon {
            width: 18px;
            height: 18px;
            position: relative;
            flex-shrink: 0;
        }
        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: currentColor;
            border-radius: 2px;
            transition: 0.3s;
        }
        .faq-icon::before {
            width: 12px;
            height: 2px;
        }
        .faq-icon::after {
            width: 2px;
            height: 12px;
        }
        .faq-item.active .faq-icon::after {
            transform: translate(-50%, -50%) scaleY(0);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 240px;
            padding: 0 20px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(59, 130, 246, 0.06)), var(--bg-secondary);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.15), transparent 70%);
            top: -80px;
            right: -60px;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }
        .cta-section p {
            color: var(--text-secondary);
            margin-bottom: 32px;
            font-size: 0.9375rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-footer);
            border-top: 1px solid var(--border);
            padding: 64px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand .logo {
            margin-bottom: 16px;
            display: inline-flex;
        }
        .footer-desc {
            font-size: 0.8125rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-top: 16px;
        }
        .footer-col h4 {
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col a {
            font-size: 0.8125rem;
            color: var(--text-secondary);
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: var(--energy);
        }
        .footer-contact-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8125rem;
            color: var(--text-secondary);
            margin-bottom: 12px;
            line-height: 1.5;
        }
        .footer-contact-item svg {
            width: 16px;
            height: 16px;
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.75rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav {
                display: none;
            }
            .search-box {
                display: none;
            }
            .header-actions .btn-energy {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .mobile-menu {
                display: flex;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .section-header h2 {
                font-size: 1.5rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .page-hero {
                padding: 120px 0 48px;
            }
            .hero-badges {
                flex-direction: column;
                align-items: center;
                gap: 8px;
            }
            .category-tabs {
                max-width: 100%;
            }
        }
        @media (max-width: 576px) {
            .site-header {
                height: 56px;
            }
            .mobile-menu {
                top: 56px;
            }
            .container {
                padding: 0 16px;
            }
            .section {
                padding: var(--space-section-mobile) 0;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .header-inner {
                gap: 8px;
            }
            .logo {
                font-size: 1rem;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
                padding: 0 16px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
        }