:root {
    --bg: #070d12;
    --surface: #122030;
    --accent: #f97316;
    --accent-hover: #ea580c;
    --accent2: #38bdf8;
    --text: #f0f8ff;
    --muted: #8fa5b8;
    --font-display: 'Oswald', sans-serif;
    --font-body: 'Fira Sans', sans-serif;
    --border-color: rgba(143, 165, 184, 0.2);
    --panel-glow: 0 0 15px rgba(56, 189, 248, 0.05);
  }

  * {
    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;
    -webkit-font-smoothing: antialiased;
    background-image:
      linear-gradient(rgba(56, 189, 248, 0.02) 1px, transparent 1px),
      linear-gradient(90deg, rgba(56, 189, 248, 0.02) 1px, transparent 1px);
    background-size: 30px 30px;
    background-position: center top;
  }

  .container {
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1.25rem;
  }

  a {
    color: var(--accent2);
    text-decoration: none;
    transition: all 0.2s ease;
  }

  a:hover {
    color: var(--accent);
  }

  /* Typography */
  h1, h2, h3, .brand, .footer-brand {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.25rem;
    font-family: var(--font-display);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    min-height: 44px;
    transition: all 0.3s ease;
    border-radius: 2px;
  }

  .btn-primary {
    background-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 10px rgba(249, 115, 22, 0.2);
  }

  .btn-primary:hover {
    background-color: var(--accent-hover);
    color: #fff;
    box-shadow: 0 0 15px rgba(249, 115, 22, 0.4);
  }

  .btn-secondary {
    background-color: transparent;
    color: var(--accent2);
    border: 1px solid var(--accent2);
  }

  .btn-secondary:hover {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent2);
  }

  /* --- HEADER (Part A1) --- */
  header {
    background-color: rgba(7, 13, 18, 0.95);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
  }

  .brand {
    font-size: 1.75rem;
    color: var(--text);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .brand:hover {
    color: var(--accent);
  }

  .nav-links {
    display: none;
    gap: 1.5rem;
  }

  .nav-links a {
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .nav-links a:hover {
    color: var(--accent2);
  }

  .nav-actions {
    display: none;
    gap: 1rem;
  }

  .menu-toggle {
    display: block;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    min-width: 44px;
    min-height: 44px;
  }

  .mobile-menu {
    display: none;
    flex-direction: column;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    gap: 1rem;
  }

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

  .mobile-menu a {
    color: var(--text);
    font-size: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
  }

  .mobile-menu .btn {
    margin-top: 0.5rem;
    border-bottom: none;
  }

  @media (min-width: 1024px) {
    .menu-toggle { display: none; }
    .nav-links { display: flex; }
    .nav-actions { display: flex; }
    .mobile-menu { display: none !important; }
  }

  /* --- PAGE HERO --- */
  .page-hero {
    padding: 3rem 0;
    background: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.1) 0%, transparent 70%);
    border-bottom: 1px solid var(--border-color);
  }

  .breadcrumb {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 1rem;
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(18, 32, 48, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 2px;
  }

  .page-hero h1 {
    font-size: 2.2rem;
    line-height: 1.2;
    margin-bottom: 1.25rem;
    color: var(--text);
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    border-left: 4px solid var(--accent);
    padding-left: 1rem;
  }

  .meta-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-family: monospace;
    background-color: var(--surface);
    color: var(--accent2);
    padding: 0.4rem 0.8rem;
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: 2px;
  }

  .chip .icon {
    color: var(--muted);
  }

  @media (min-width: 768px) {
    .page-hero { padding: 4rem 0; }
    .page-hero h1 { font-size: 3rem; }
  }

  /* --- MAIN CONTENT --- */
  main {
    padding: 3rem 0;
  }

  .content-layout {
    display: grid;
    gap: 2.5rem;
  }

  /* Terminal Panels */
  .sys-panel {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    box-shadow: var(--panel-glow);
    position: relative;
  }

  .sys-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent2) 0%, transparent 100%);
    opacity: 0.5;
  }

  .sys-panel-intro {
    border-left: 3px solid var(--accent);
    background: linear-gradient(135deg, var(--surface) 0%, #0c1622 100%);
    font-size: 1.1rem;
    color: #e2e8f0;
  }

  .sys-panel h2 {
    font-size: 1.5rem;
    color: var(--accent2);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .sys-panel h2::before {
    content: '>';
    color: var(--accent);
    font-family: monospace;
    font-weight: bold;
  }

  .sys-panel p {
    margin-bottom: 1.25rem;
    color: var(--muted);
  }

  .sys-panel p:last-child {
    margin-bottom: 0;
  }

  .sys-panel p a {
    color: var(--accent);
    border-bottom: 1px dashed var(--accent);
    font-weight: 500;
  }

  .sys-panel p a:hover {
    color: var(--text);
    border-bottom-style: solid;
  }

  /* Lists */
  .data-list {
    list-style: none;
    margin: 1.5rem 0;
    padding: 0;
    background: rgba(7, 13, 18, 0.5);
    border: 1px solid var(--border-color);
  }

  .data-list li {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--text);
    font-size: 0.95rem;
  }

  .data-list li:last-child {
    border-bottom: none;
  }

  .data-list li::before {
    content: '[OK]';
    color: var(--accent2);
    font-family: monospace;
    font-size: 0.85rem;
    margin-top: 0.15rem;
  }

  /* --- FAQ SECTION --- */
  .faq-section {
    margin-top: 3rem;
  }

  .faq-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text);
  }

  .faq-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  details.faq-item {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 2px;
  }

  details.faq-item summary {
    padding: 1.25rem;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: 0.5px;
  }

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

  details.faq-item summary::after {
    content: '+';
    color: var(--accent2);
    font-family: monospace;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
  }

  details.faq-item[open] summary {
    border-bottom: 1px solid var(--border-color);
    color: var(--accent2);
  }

  details.faq-item[open] summary::after {
    content: '-';
    color: var(--accent);
  }

  details.faq-item p {
    padding: 1.25rem;
    color: var(--muted);
    margin: 0;
    background: rgba(7, 13, 18, 0.3);
  }

  /* --- RELATED LINKS BLOCK --- */
  .related-nav {
    margin-top: 3rem;
    background-color: var(--surface);
    border: 1px solid var(--accent2);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .related-nav::after {
    content: '';
    position: absolute;
    bottom: 0; right: 0;
    width: 50px; height: 50px;
    background: linear-gradient(135deg, transparent 50%, rgba(56, 189, 248, 0.2) 50%);
  }

  .related-nav h3 {
    font-size: 1.2rem;
    color: var(--muted);
    margin-bottom: 1.5rem;
  }

  .nav-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .nav-grid a {
    display: block;
    padding: 1rem;
    background: rgba(7, 13, 18, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text);
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
  }

  .nav-grid a:hover {
    background: var(--accent2);
    color: var(--bg);
    border-color: var(--accent2);
    transform: translateY(-2px);
  }

  @media (min-width: 768px) {
    .nav-grid { grid-template-columns: repeat(3, 1fr); }
  }

  /* --- CTA BLOCK --- */
  .cta-block {
    margin-top: 3rem;
    background: linear-gradient(45deg, var(--surface) 0%, #1a2f44 100%);
    border: 1px solid var(--accent);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.1);
  }

  .cta-block h2 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 1rem;
  }

  .cta-block p {
    color: var(--text);
    margin-bottom: 2rem;
    font-size: 1.1rem;
  }

  .cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
  }

  @media (min-width: 600px) {
    .cta-buttons { flex-direction: row; }
  }

  /* --- FOOTER (Part A2) --- */
  footer {
    background-color: #04080b;
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
  }

  .footer-brand {
    font-size: 2rem;
    color: var(--text);
    margin-bottom: 1rem;
  }

  .footer-tagline {
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    max-width: 500px;
  }

  .footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 2rem;
    margin-bottom: 3rem;
  }

  .footer-links a {
    color: var(--muted);
    font-size: 0.9rem;
  }

  .footer-links a:hover {
    color: var(--accent2);
  }

  .copyright {
    color: #4a5d6e;
    font-size: 0.85rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 2rem;
  }


/* 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; }