:root {
    --bg-main: #070d12;
    --bg-surface: #122030;
    --bg-surface-alt: #1a2c42;
    --accent-primary: #f97316;
    --accent-secondary: #38bdf8;
    --text-light: #f0f8ff;
    --text-muted: #8fa5b8;
    --border-subtle: rgba(143, 165, 184, 0.15);
    --border-focus: rgba(56, 189, 248, 0.4);

    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Fira Sans', sans-serif;

    --transition: all 0.3s ease;
  }

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

  body {
    font-family: var(--font-body);
    background-color: var(--bg-main);
    color: var(--text-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  a { text-decoration: none; color: var(--accent-secondary); transition: var(--transition); }
  a:hover { color: var(--accent-primary); }

  h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 500; line-height: 1.2; }

  .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

  /* Buttons */
  .btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 24px; font-family: var(--font-heading); text-transform: uppercase;
    letter-spacing: 1px; font-size: 0.95rem; cursor: pointer; border: none;
    min-height: 44px; transition: var(--transition);
  }
  .btn-primary {
    background-color: var(--accent-primary); color: #000;
    border: 1px solid var(--accent-primary);
  }
  .btn-primary:hover {
    background-color: transparent; color: var(--accent-primary);
    box-shadow: 0 0 15px rgba(249, 115, 22, 0.3);
  }
  .btn-secondary {
    background-color: transparent; color: var(--accent-secondary);
    border: 1px solid var(--accent-secondary);
  }
  .btn-secondary:hover {
    background-color: var(--accent-secondary); color: #000;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
  }

  /* Header (Part A1 styles) */
  header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky; top: 0; z-index: 100;
  }
  .nav-container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
  .brand { font-family: var(--font-heading); font-size: 1.8rem; font-weight: 700; color: var(--text-light); text-transform: uppercase; letter-spacing: 2px; }
  .nav-links { display: none; gap: 20px; }
  .nav-links a { color: var(--text-light); font-size: 0.95rem; font-weight: 500; text-transform: uppercase; font-family: var(--font-heading); letter-spacing: 0.5px; }
  .nav-links a:hover { color: var(--accent-primary); }
  .nav-actions { display: none; gap: 15px; }
  .menu-toggle {
    display: block; background: none; border: 1px solid var(--border-subtle);
    color: var(--text-light); font-size: 1.5rem; cursor: pointer;
    width: 44px; height: 44px; border-radius: 4px;
  }
  .mobile-menu {
    display: none; position: absolute; top: 70px; left: 0; width: 100%;
    background-color: var(--bg-surface-alt); border-bottom: 1px solid var(--border-subtle);
    padding: 20px; flex-direction: column; gap: 15px; z-index: 99;
  }
  .mobile-menu.active { display: flex; }
  .mobile-menu a { color: var(--text-light); font-size: 1.1rem; padding: 10px 0; border-bottom: 1px solid var(--border-subtle); }
  .mobile-menu a:last-child { border-bottom: none; }
  .mobile-menu .btn { margin-top: 10px; text-align: center; 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 Banner / Hero */
  .page-banner {
    background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-main) 100%);
    border-top: 3px solid var(--accent-primary);
    padding: 40px 0 30px;
    position: relative;
    overflow: hidden;
  }
  .page-banner::before {
    content: ''; position: absolute; top: 0; right: 0; bottom: 0; left: 0;
    background-image:
      linear-gradient(var(--border-subtle) 1px, transparent 1px),
      linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
    background-size: 40px 40px; opacity: 0.2; pointer-events: none;
  }
  .breadcrumb {
    font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px;
    font-family: var(--font-heading); text-transform: uppercase; letter-spacing: 1px;
    position: relative; z-index: 2;
  }
  .page-banner h1 {
    font-size: 2.2rem; color: var(--text-light); margin-bottom: 20px;
    text-transform: uppercase; letter-spacing: 1px; position: relative; z-index: 2;
  }
  .meta-chips {
    display: flex; gap: 10px; flex-wrap: wrap; position: relative; z-index: 2;
  }
  .chip {
    background-color: rgba(56, 189, 248, 0.1); border: 1px solid var(--border-focus);
    color: var(--accent-secondary); padding: 4px 12px; font-size: 0.8rem;
    font-family: var(--font-heading); text-transform: uppercase; letter-spacing: 1px;
  }

  @media (min-width: 768px) {
    .page-banner { padding: 60px 0 40px; }
    .page-banner h1 { font-size: 3rem; }
  }

  /* Main Content Area */
  .content-wrapper { padding: 40px 0 80px; }

  .intro-block {
    background-color: var(--bg-surface);
    border-left: 4px solid var(--accent-primary);
    padding: 25px; margin-bottom: 40px;
    font-size: 1.1rem; color: var(--text-light);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  }

  .content-grid { display: grid; gap: 40px; }
  @media (min-width: 1024px) {
    .content-grid { grid-template-columns: 2fr 1fr; gap: 60px; }
  }

  .main-article { display: flex; flex-direction: column; gap: 40px; }

  .terminal-section {
    position: relative;
  }
  .terminal-section h2 {
    font-size: 1.5rem; color: var(--accent-secondary); margin-bottom: 20px;
    display: flex; align-items: center; gap: 10px; text-transform: uppercase;
    border-bottom: 1px solid var(--border-subtle); padding-bottom: 10px;
  }
  .terminal-section h2::before {
    content: '>'; color: var(--accent-primary); font-weight: bold;
  }
  .terminal-section p {
    color: var(--text-muted); margin-bottom: 15px; font-size: 1.05rem;
  }
  .terminal-section p a {
    color: var(--accent-primary); border-bottom: 1px dashed var(--accent-primary);
  }
  .terminal-section p a:hover {
    color: var(--text-light); border-bottom-style: solid;
  }

  .data-list {
    list-style: none; margin: 20px 0; padding: 0;
    background: var(--bg-surface-alt); padding: 20px; border: 1px solid var(--border-subtle);
  }
  .data-list li {
    position: relative; padding-left: 25px; margin-bottom: 12px; color: var(--text-light);
  }
  .data-list li:last-child { margin-bottom: 0; }
  .data-list li::before {
    content: '■'; position: absolute; left: 0; top: 2px;
    color: var(--accent-primary); font-size: 0.8rem;
  }

  /* FAQ Accordion */
  .faq-container { margin-top: 20px; }
  .faq-item {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    margin-bottom: 10px;
    transition: var(--transition);
  }
  .faq-item:hover { border-color: var(--border-focus); }
  .faq-item summary {
    padding: 18px 20px; cursor: pointer; font-family: var(--font-heading);
    font-size: 1.1rem; color: var(--text-light); list-style: none;
    display: flex; justify-content: space-between; align-items: center;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-item summary::after {
    content: '+'; color: var(--accent-primary); font-size: 1.5rem; font-weight: normal;
  }
  .faq-item[open] summary::after { content: '−'; }
  .faq-item[open] summary { border-bottom: 1px solid var(--border-subtle); color: var(--accent-secondary); }
  .faq-item p {
    padding: 20px; color: var(--text-muted); margin: 0; background-color: rgba(0,0,0,0.2);
  }

  /* Sidebar / Related Links */
  .sidebar {
    display: flex; flex-direction: column; gap: 30px;
  }
  .nav-panel {
    background-color: var(--bg-surface); border: 1px solid var(--border-subtle);
    padding: 25px;
  }
  .nav-panel h3 {
    font-size: 1.2rem; color: var(--text-light); margin-bottom: 20px;
    text-transform: uppercase; letter-spacing: 1px;
    border-left: 3px solid var(--accent-secondary); padding-left: 10px;
  }
  .sys-links { display: flex; flex-direction: column; gap: 12px; }
  .sys-links a {
    display: block; padding: 12px 15px; background-color: var(--bg-surface-alt);
    border: 1px solid transparent; color: var(--text-muted);
    font-family: var(--font-heading); text-transform: uppercase; font-size: 0.95rem;
    transition: var(--transition);
  }
  .sys-links a:hover {
    background-color: rgba(56, 189, 248, 0.1); border-color: var(--border-focus);
    color: var(--accent-secondary); padding-left: 20px;
  }

  /* CTA Block */
  .cta-terminal {
    background: linear-gradient(135deg, var(--bg-surface) 0%, #1a100c 100%);
    border: 1px solid var(--accent-primary);
    padding: 40px; text-align: center; margin-top: 60px;
    position: relative; overflow: hidden;
  }
  .cta-terminal::before {
    content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%;
    background-color: var(--accent-primary);
  }
  .cta-terminal h3 {
    font-size: 2rem; color: var(--text-light); margin-bottom: 15px; text-transform: uppercase;
  }
  .cta-terminal p { color: var(--text-muted); margin-bottom: 30px; font-size: 1.1rem; }
  .cta-actions { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }

  /* Footer (Part A2 styles) */
  footer {
    background-color: var(--bg-surface); border-top: 1px solid var(--border-subtle);
    padding: 60px 0 30px; margin-top: 40px;
  }
  .footer-brand {
    font-family: var(--font-heading); font-size: 2rem; font-weight: 700;
    color: var(--text-light); text-transform: uppercase; letter-spacing: 2px; margin-bottom: 15px;
  }
  .footer-tagline { color: var(--text-muted); margin-bottom: 30px; font-size: 1.05rem; }
  .footer-links {
    display: flex; flex-wrap: wrap; gap: 15px 30px; margin-bottom: 40px;
  }
  .footer-links a { color: var(--text-muted); font-size: 0.95rem; }
  .footer-links a:hover { color: var(--accent-secondary); }
  .copyright {
    border-top: 1px solid var(--border-subtle); padding-top: 20px;
    color: var(--text-muted); font-size: 0.85rem; text-align: center;
  }


/* 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; }