:root {
    --bg: #0a1118;
    --surface: #142230;
    --accent: #4dd0ff;
    --accent-hover: #2bb8f2;
    --accent2: #ffd166;
    --text: #f0faff;
    --muted: #8fa8b8;
    --font-display: 'Russo One', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    --container-width: 1024px;
    --radius: 12px;
    --transition: all 0.3s ease;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
  }
  a { color: var(--accent); text-decoration: none; transition: var(--transition); }
  a:hover { color: var(--accent2); }
  img { max-width: 100%; height: auto; display: block; }
  .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }

  /* Typography */
  h1, h2, h3, .font-display { font-family: var(--font-display); font-weight: normal; }
  h1 { font-size: 2rem; line-height: 1.2; margin-bottom: 1rem; color: var(--text); }
  h2 { font-size: 1.5rem; margin-top: 2.5rem; margin-bottom: 1rem; color: var(--accent); border-bottom: 1px solid rgba(77, 208, 255, 0.2); padding-bottom: 0.5rem; }
  p { margin-bottom: 1rem; color: var(--text); }

  /* Buttons */
  .btn {
    display: inline-flex; justify-content: center; align-items: center;
    padding: 12px 24px; border-radius: 8px; font-weight: 600;
    text-transform: uppercase; font-size: 0.9rem; letter-spacing: 0.5px;
    cursor: pointer; transition: var(--transition); text-align: center;
    min-height: 44px;
  }
  .btn-primary { background: var(--accent); color: #000; }
  .btn-primary:hover { background: var(--accent-hover); color: #000; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(77, 208, 255, 0.3); }
  .btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--muted); }
  .btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

  /* HEADER (Strict from Part A) */
  header { background: var(--surface); border-bottom: 1px solid rgba(143, 168, 184, 0.2); position: sticky; top: 0; z-index: 100; }
  .header-inner { display: flex; justify-content: space-between; align-items: center; height: 70px; }
  .logo { font-family: var(--font-display); font-size: 1.8rem; color: var(--text); display: flex; align-items: center; gap: 10px; }
  .logo span { color: var(--accent); }
  .nav-links { display: none; gap: 20px; }
  .nav-links a { color: var(--text); font-weight: 600; font-size: 0.95rem; }
  .nav-links a:hover { color: var(--accent); }
  .header-ctas { display: none; gap: 10px; }
  .mobile-toggle { display: block; background: none; border: none; color: var(--text); font-size: 1.8rem; cursor: pointer; padding: 5px; min-width: 44px; min-height: 44px; }
  .mobile-menu { display: none; background: var(--surface); padding: 20px; border-bottom: 1px solid rgba(143, 168, 184, 0.2); flex-direction: column; gap: 15px; position: absolute; width: 100%; top: 70px; left: 0; box-shadow: 0 10px 20px rgba(0,0,0,0.5); }
  .mobile-menu.active { display: flex; }
  .mobile-menu a { color: var(--text); font-weight: 600; font-size: 1.1rem; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
  .mobile-menu .header-ctas { display: flex; flex-direction: column; margin-top: 10px; }

  /* HERO BANNER */
  .hero {
    position: relative;
    padding: 60px 0 40px;
    background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
    overflow: hidden;
    text-align: center;
  }
  .hero::before, .hero::after {
    content: ''; position: absolute;
    width: 60px; height: 60px; background: var(--accent);
    transform: rotate(45deg); opacity: 0.05; border-radius: 4px;
  }
  .hero::before { top: 20%; left: 10%; }
  .hero::after { bottom: 20%; right: 10%; background: var(--accent2); width: 40px; height: 40px; }
  .breadcrumb {
    font-size: 0.85rem; color: var(--muted); margin-bottom: 20px;
    display: inline-block; background: rgba(20, 34, 48, 0.8); padding: 6px 16px; border-radius: 20px;
  }
  .meta-chips {
    display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-top: 20px;
  }
  .chip {
    font-size: 0.8rem; background: rgba(77, 208, 255, 0.1); color: var(--accent);
    padding: 4px 12px; border-radius: 20px; border: 1px solid rgba(77, 208, 255, 0.2);
    display: inline-flex; align-items: center; gap: 6px;
  }
  .chip-accent { background: rgba(255, 209, 102, 0.1); color: var(--accent2); border-color: rgba(255, 209, 102, 0.2); }

  /* MAIN CONTENT */
  .main-content { padding: 40px 0; }
  .content-wrapper { max-width: 800px; margin: 0 auto; }

  .intro-card {
    background: var(--surface); padding: 30px; border-radius: var(--radius);
    border-left: 4px solid var(--accent2); margin-bottom: 40px;
    position: relative; box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  }
  .intro-card p { font-size: 1.1rem; color: var(--text); margin: 0; line-height: 1.8; }
  .intro-card::before {
    content: '"'; position: absolute; top: 10px; right: 20px;
    font-family: var(--font-display); font-size: 4rem; color: rgba(255, 209, 102, 0.1); line-height: 1;
  }

  .content-section { margin-bottom: 40px; }
  .content-section a { text-decoration: underline; text-decoration-color: rgba(77, 208, 255, 0.4); text-underline-offset: 4px; }
  .content-section a:hover { text-decoration-color: var(--accent2); }

  .custom-list { list-style: none; margin: 20px 0; padding: 0; }
  .custom-list li {
    position: relative; padding-left: 35px; margin-bottom: 15px; color: var(--text);
  }
  .custom-list li::before {
    content: ''; position: absolute; left: 0; top: 4px;
    width: 12px; height: 12px; background: var(--accent);
    transform: rotate(45deg); border-radius: 2px;
  }
  .custom-list li::after {
    content: ''; position: absolute; left: 5px; top: 16px;
    width: 2px; height: 15px; background: var(--muted); opacity: 0.5;
  }

  /* FAQ SECTION */
  .faq-container { margin-top: 50px; }
  details {
    background: var(--surface); border-radius: var(--radius);
    margin-bottom: 15px; border: 1px solid rgba(143, 168, 184, 0.1);
    overflow: hidden; transition: var(--transition);
  }
  details:hover { border-color: rgba(77, 208, 255, 0.3); }
  summary {
    padding: 20px; cursor: pointer; font-weight: 600; font-size: 1.1rem;
    color: var(--text); list-style: none; display: flex; justify-content: space-between; align-items: center;
  }
  summary::-webkit-details-marker { display: none; }
  summary::after {
    content: '+'; font-family: var(--font-display); color: var(--accent);
    font-size: 1.5rem; line-height: 1; transition: transform 0.3s;
  }
  details[open] summary::after { content: '-'; transform: rotate(180deg); color: var(--accent2); }
  details p { padding: 0 20px 20px; margin: 0; color: var(--muted); border-top: 1px solid rgba(255,255,255,0.05); padding-top: 15px; }

  /* RELATED LINKS */
  .related-links-section {
    margin: 60px 0; padding: 40px; background: var(--surface);
    border-radius: var(--radius); text-align: center; position: relative;
    overflow: hidden;
  }
  .related-links-section h2 { margin-top: 0; border: none; display: inline-block; position: relative; }
  .related-links-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 15px; margin-top: 30px;
  }
  .related-link-card {
    background: var(--bg); padding: 15px 20px; border-radius: 8px;
    border: 1px solid rgba(143, 168, 184, 0.2); color: var(--text);
    font-weight: 600; transition: var(--transition); display: flex; align-items: center; justify-content: center;
  }
  .related-link-card:hover {
    border-color: var(--accent); background: rgba(77, 208, 255, 0.05); transform: translateY(-3px); text-decoration: none;
  }

  /* BOTTOM CTA */
  .bottom-cta {
    background: linear-gradient(135deg, var(--surface) 0%, #1a2f42 100%);
    padding: 60px 20px; text-align: center; border-radius: var(--radius);
    margin: 40px auto 60px; max-width: 800px; position: relative; border: 1px solid rgba(77, 208, 255, 0.2);
  }
  .bottom-cta h3 { font-size: 1.8rem; margin-bottom: 15px; color: var(--text); }
  .bottom-cta p { color: var(--muted); margin-bottom: 30px; font-size: 1.1rem; }
  .cta-buttons { display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; }

  /* FOOTER (Strict from Part A) */
  footer { background: var(--surface); padding: 60px 0 20px; border-top: 1px solid rgba(143, 168, 184, 0.2); }
  .footer-grid { display: grid; grid-template-columns: 1fr; gap: 40px; margin-bottom: 40px; }
  .footer-brand { font-family: var(--font-display); font-size: 2rem; color: var(--text); margin-bottom: 15px; }
  .footer-brand span { color: var(--accent); }
  .footer-tagline { color: var(--muted); max-width: 300px; }
  .footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .footer-links a { color: var(--muted); font-size: 0.9rem; }
  .footer-links a:hover { color: var(--accent); }
  .footer-bottom { text-align: center; color: var(--muted); font-size: 0.85rem; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.05); }

  /* RESPONSIVE */
  @media (min-width: 768px) {
    h1 { font-size: 2.8rem; }
    .footer-grid { grid-template-columns: 1fr 2fr; }
    .footer-links { grid-template-columns: repeat(3, 1fr); }
    .hero { padding: 80px 0 50px; }
  }
  @media (min-width: 1024px) {
    .nav-links, .header-ctas { display: flex; }
    .mobile-toggle { display: none; }
  }


/* pipeline image & layout guards */
html, body { overflow-x: clip; }
img { max-width: 100%; height: auto; }
img.site-logo { height: 40px; width: auto; max-width: 240px; object-fit: contain; flex: none; }
header .logo a { display: inline-flex; align-items: center; flex: none; text-decoration: none; }
img.hero-visual { width: 100%; max-width: 560px; height: auto; object-fit: cover; border-radius: 16px; display: block; margin-inline: auto; }
img[class^="strip-"], img[class*=" strip-"] { width: 100%; height: auto; display: block; border-radius: 12px; object-fit: cover; }
/* 合规声明块（zb-disclaimer，全站 footer） */
.zb-disclaimer { margin-top: 18px !important; padding: 14px 0 0 0 !important; border-top: 1px solid rgba(128,128,128,.25) !important; font-size: .72rem !important; line-height: 1.7 !important; opacity: .85 !important; display: block !important; text-align: left !important; width: 100% !important; clear: both !important; }
.zb-disclaimer .zb-18 { display: inline-block !important; padding: 2px 10px !important; border: 1.5px solid currentColor !important; border-radius: 6px !important; font-weight: 800 !important; letter-spacing: 1px !important; margin: 0 0 10px 0 !important; font-size: .78rem !important; }
.zb-disclaimer p { display: block !important; margin: 5px 0 !important; padding: 0 !important; color: inherit !important; font-size: .72rem !important; line-height: 1.7 !important; }
.zb-disclaimer p:last-child { margin-bottom: 0 !important; }