:root {
        --bg: #0a1118;
        --surface: #142230;
        --surface-light: #1f3347;
        --accent: #4dd0ff;
        --accent2: #ffd166;
        --text: #f0faff;
        --muted: #8fa8b8;
        --font-display: 'Russo One', sans-serif;
        --font-body: 'Open Sans', sans-serif;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { background-color: var(--bg); color: var(--text); font-family: var(--font-body); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    a { text-decoration: none; color: var(--accent); transition: all 0.3s ease; }
    h1, h2, h3, h4 { font-family: var(--font-display); font-weight: normal; }
    .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

    /* Header Styles */
    header { background-color: var(--surface); border-bottom: 2px solid var(--accent); 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: 0.5rem; }
    .logo span { color: var(--accent); }
    .nav-links { display: none; gap: 1.5rem; }
    .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: 1rem; }
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.6rem 1.2rem; border-radius: 6px; font-weight: 700; font-family: var(--font-body); cursor: pointer; transition: all 0.3s; min-height: 44px; text-transform: uppercase; letter-spacing: 0.5px; font-size: 0.9rem; text-align: center; }
    .btn-primary { background-color: var(--accent); color: var(--bg); border: 2px solid var(--accent); }
    .btn-primary:hover { background-color: transparent; color: var(--accent); }
    .btn-secondary { background-color: transparent; color: var(--accent2); border: 2px solid var(--accent2); }
    .btn-secondary:hover { background-color: var(--accent2); color: var(--bg); }
    .mobile-toggle { background: none; border: none; color: var(--text); font-size: 1.8rem; cursor: pointer; display: block; min-height: 44px; min-width: 44px; }
    .mobile-menu { display: none; background-color: var(--surface); padding: 1rem 1.5rem; flex-direction: column; gap: 1rem; border-bottom: 2px solid var(--accent); position: absolute; width: 100%; left: 0; top: 70px; z-index: 99; }
    .mobile-menu.active { display: flex; }
    .mobile-menu a { color: var(--text); font-weight: 600; padding: 0.5rem 0; border-bottom: 1px solid rgba(143, 168, 184, 0.2); }
    .mobile-menu .header-ctas { display: flex; flex-direction: column; margin-top: 1rem; gap: 0.8rem; }

    /* Hero Banner */
    .hero { padding: 3rem 0 4rem; background: radial-gradient(circle at top right, var(--surface), var(--bg)); position: relative; overflow: hidden; border-bottom: 1px dashed rgba(143, 168, 184, 0.3); }
    .hero::after { content: ''; position: absolute; top: -40px; right: 10%; width: 120px; height: 120px; background-color: var(--accent); opacity: 0.05; transform: rotate(45deg); }
    .hero::before { content: ''; position: absolute; bottom: -60px; left: 5%; width: 180px; height: 180px; background-color: var(--accent2); opacity: 0.03; transform: rotate(45deg); }
    .breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 1.5rem; display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; position: relative; z-index: 2; }
    .breadcrumb span { color: var(--accent); }
    .hero h1 { font-size: clamp(2rem, 4vw, 3.2rem); color: var(--text); line-height: 1.2; margin-bottom: 1.5rem; position: relative; z-index: 2; max-width: 900px; }
    .meta-chips { display: flex; gap: 1rem; flex-wrap: wrap; position: relative; z-index: 2; }
    .chip { background-color: rgba(31, 51, 71, 0.7); color: var(--accent2); padding: 0.4rem 1rem; border-radius: 20px; font-size: 0.85rem; font-weight: 600; border: 1px solid rgba(255, 209, 102, 0.2); display: inline-flex; align-items: center; }

    /* Main Content Area */
    .main-content { padding: 4rem 0; }

    .intro-block { background-color: var(--surface); padding: 2rem 2.5rem; border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; font-size: 1.1rem; margin-bottom: 4rem; color: var(--text); box-shadow: 0 10px 30px rgba(0,0,0,0.15); line-height: 1.8; }

    .grid-2 { display: grid; grid-template-columns: 1fr; gap: 2.5rem; margin-bottom: 4rem; }

    .card { background-color: var(--surface); padding: 2.5rem; border-radius: 16px; border: 1px solid rgba(77, 208, 255, 0.1); transition: transform 0.3s ease, box-shadow 0.3s ease; position: relative; }
    .card:hover { transform: translateY(-5px); box-shadow: 0 15px 35px rgba(0,0,0,0.3); border-color: rgba(77, 208, 255, 0.3); }
    .card h2 { font-size: 1.5rem; color: var(--accent); margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.8rem; line-height: 1.3; }
    .card h2::before { content: ''; display: inline-block; width: 10px; height: 10px; background-color: var(--accent2); transform: rotate(45deg); flex-shrink: 0; }
    .card p { color: var(--muted); margin-bottom: 1.2rem; }
    .card p:last-child { margin-bottom: 0; }
    .card a { color: var(--accent2); font-weight: 600; border-bottom: 1px dashed var(--accent2); }
    .card a:hover { color: var(--accent); border-bottom-color: var(--accent); }

    .card-highlight { background: linear-gradient(145deg, var(--surface), #1a2a3a); border: 2px dashed var(--accent); grid-column: 1 / -1; }
    .card-highlight h2 { color: var(--accent2); justify-content: center; text-align: center; font-size: 1.8rem; }
    .card-highlight h2::before { display: none; }
    .card-highlight p { text-align: center; max-width: 800px; margin-left: auto; margin-right: auto; }

    .card-security { background-color: #1a1510; border-left: 4px solid var(--accent2); margin: 0 auto 4rem; max-width: 900px; }
    .card-security h2 { color: var(--accent2); }
    .card-security h2::before { background-color: var(--accent); }

    /* Custom List */
    .feature-list { list-style: none; margin: 2.5rem auto 1rem; max-width: 800px; display: grid; gap: 1.2rem; }
    .feature-list li { background-color: var(--surface-light); padding: 1.2rem 1.5rem; border-radius: 12px; display: flex; align-items: flex-start; gap: 1rem; color: var(--text); border: 1px solid rgba(143, 168, 184, 0.1); }
    .feature-list li::before { content: ''; display: block; width: 14px; height: 14px; background-color: var(--accent); transform: rotate(45deg); margin-top: 6px; flex-shrink: 0; box-shadow: 0 0 10px rgba(77, 208, 255, 0.5); }

    /* FAQ Section */
    .faq-section { margin-bottom: 4rem; max-width: 900px; margin-left: auto; margin-right: auto; }
    .faq-section h2 { text-align: center; font-size: 2rem; margin-bottom: 2.5rem; color: var(--text); }
    .faq-wrapper { display: flex; flex-direction: column; gap: 1rem; }
    details { background-color: var(--surface); border-radius: 12px; border: 1px solid rgba(143, 168, 184, 0.15); overflow: hidden; }
    summary { padding: 1.5rem; font-family: var(--font-display); font-size: 1.1rem; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; color: var(--accent); user-select: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: '+'; font-size: 1.8rem; color: var(--muted); transition: transform 0.3s ease, color 0.3s ease; line-height: 1; }
    details[open] summary::after { transform: rotate(45deg); color: var(--accent2); }
    details p { padding: 0 1.5rem 1.5rem; color: var(--muted); border-top: 1px dashed rgba(143, 168, 184, 0.2); margin-top: 0.5rem; padding-top: 1.5rem; }

    /* Related Links */
    .related-nav { margin-bottom: 5rem; text-align: center; padding: 3rem 2rem; background-color: rgba(20, 34, 48, 0.5); border-radius: 16px; border: 1px solid rgba(77, 208, 255, 0.1); }
    .related-nav h3 { font-size: 1.5rem; margin-bottom: 2rem; color: var(--text); }
    .related-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }
    .related-grid a { background-color: var(--surface); color: var(--text); padding: 0.8rem 1.8rem; border-radius: 30px; font-weight: 600; border: 1px solid rgba(143, 168, 184, 0.3); transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
    .related-grid a:hover { background-color: var(--accent); color: var(--bg); border-color: var(--accent); transform: translateY(-5px); box-shadow: 0 8px 20px rgba(77, 208, 255, 0.3); }

    /* Grand CTA */
    .cta-grand { background: linear-gradient(135deg, var(--surface), var(--surface-light)); padding: 5rem 2rem; border-radius: 20px; text-align: center; margin-bottom: 4rem; border: 2px solid rgba(255, 209, 102, 0.2); position: relative; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,0.4); }
    .cta-grand::before { content: ''; position: absolute; top: -50px; left: -50px; width: 150px; height: 150px; background-color: var(--accent); opacity: 0.1; transform: rotate(45deg); }
    .cta-grand::after { content: ''; position: absolute; bottom: -50px; right: -50px; width: 150px; height: 150px; background-color: var(--accent2); opacity: 0.1; transform: rotate(45deg); }
    .cta-grand h2 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 1.2rem; color: var(--text); position: relative; z-index: 2; }
    .cta-grand p { color: var(--muted); margin-bottom: 2.5rem; font-size: 1.15rem; max-width: 600px; margin-left: auto; margin-right: auto; position: relative; z-index: 2; }
    .cta-buttons { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; position: relative; z-index: 2; }
    .cta-buttons .btn { min-width: 180px; font-size: 1.1rem; padding: 1rem 2rem; }

    /* Footer Styles */
    footer { background-color: var(--surface); border-top: 2px solid var(--accent); padding: 4rem 0 2rem; }
    .footer-grid { display: grid; grid-template-columns: 1fr; gap: 3rem; margin-bottom: 3rem; }
    .footer-brand { font-family: var(--font-display); font-size: 2rem; color: var(--text); margin-bottom: 1rem; }
    .footer-brand span { color: var(--accent); }
    .footer-tagline { color: var(--muted); max-width: 300px; }
    .footer-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1rem; }
    .footer-links a { color: var(--muted); transition: color 0.3s; font-size: 0.9rem; }
    .footer-links a:hover { color: var(--accent2); }
    .footer-bottom { text-align: center; color: var(--muted); font-size: 0.875rem; border-top: 1px solid rgba(143, 168, 184, 0.1); padding-top: 2rem; }

    /* Media Queries */
    @media (min-width: 768px) {
        .grid-2 { grid-template-columns: 1fr 1fr; }
        .footer-grid { grid-template-columns: 1fr 2fr; }
    }
    @media (min-width: 1024px) {
        .mobile-toggle { display: none; }
        .nav-links { display: flex; }
        .header-ctas { display: flex; }
        .mobile-menu { display: none !important; }
    }


/* 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; }