:root {
            --bg: #061218;
            --surface: #0d2230;
            --surface-light: #153347;
            --accent: #22d3ee;
            --accent-glow: rgba(34, 211, 238, 0.3);
            --accent2: #a3e635;
            --text: #f0faff;
            --muted: #8fadb8;
            --font-display: 'Chakra Petch', sans-serif;
            --font-body: 'Manrope', sans-serif;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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;
            overflow-x: hidden;
        }

        h1, h2, h3, .logo, .nav-links a, .btn {
            font-family: var(--font-display);
        }

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

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

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

        /* HEADER STYLES (Targeting Part A1 structure) */
        header {
            background-color: rgba(6, 18, 24, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(34, 211, 238, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 15px 0;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 24px;
            font-weight: 700;
            color: var(--text);
            text-transform: lowercase;
            letter-spacing: 1px;
        }

        .logo span {
            color: var(--accent);
        }

        .nav-links {
            display: flex;
            gap: 24px;
        }

        .nav-links a {
            color: var(--text);
            font-weight: 600;
            font-size: 15px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .nav-links a:hover {
            color: var(--accent);
            text-shadow: 0 0 8px var(--accent-glow);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 28px;
            cursor: pointer;
            padding: 5px;
        }

        /* HERO BANNER */
        .hero {
            position: relative;
            padding: 80px 0 60px;
            background: radial-gradient(circle at top right, var(--surface-light) 0%, var(--bg) 60%);
            border-bottom: 1px solid rgba(34, 211, 238, 0.1);
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
            border-radius: 50%;
            z-index: 0;
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .breadcrumb {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 20px;
            display: inline-block;
            padding: 6px 16px;
            background: rgba(13, 34, 48, 0.6);
            border-radius: 20px;
            border: 1px solid rgba(143, 173, 184, 0.2);
        }

        .hero h1 {
            font-size: 42px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 24px;
            line-height: 1.2;
            text-transform: uppercase;
            letter-spacing: 1px;
            text-shadow: 0 2px 10px rgba(0,0,0,0.5);
        }

        .meta-chips {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .chip {
            font-size: 13px;
            font-weight: 600;
            color: var(--bg);
            background-color: var(--accent);
            padding: 6px 14px;
            border-radius: 4px;
            font-family: var(--font-display);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            box-shadow: 0 0 15px var(--accent-glow);
        }

        .chip:nth-child(2) {
            background-color: var(--accent2);
            box-shadow: 0 0 15px rgba(163, 230, 53, 0.2);
        }

        /* MAIN CONTENT AREA */
        .content-area {
            padding: 60px 0;
        }

        .intro-block {
            background: linear-gradient(180deg, var(--surface) 0%, transparent 100%);
            border-left: 4px solid var(--accent);
            padding: 30px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin-bottom: 60px;
            font-size: 18px;
            color: var(--text);
            line-height: 1.8;
            position: relative;
        }

        /* SECTION CARDS */
        .guide-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            margin-bottom: 80px;
        }

        .guide-card {
            background: var(--surface);
            border: 1px solid rgba(143, 173, 184, 0.1);
            border-radius: var(--radius-lg);
            padding: 40px;
            position: relative;
            transition: var(--transition);
            overflow: hidden;
        }

        .guide-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 150px;
            height: 150px;
            background: radial-gradient(circle at top right, var(--accent-glow), transparent 70%);
            opacity: 0.5;
        }

        .guide-card:hover {
            border-color: rgba(34, 211, 238, 0.3);
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        .step-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            background: rgba(34, 211, 238, 0.1);
            color: var(--accent);
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 700;
            border-radius: 12px;
            margin-bottom: 24px;
            border: 1px solid rgba(34, 211, 238, 0.2);
        }

        .guide-card h2 {
            font-size: 26px;
            margin-bottom: 20px;
            color: var(--text);
        }

        .guide-card p {
            color: var(--muted);
            margin-bottom: 16px;
        }

        .guide-card p a {
            text-decoration: underline;
            text-decoration-color: rgba(34, 211, 238, 0.4);
            text-underline-offset: 4px;
            font-weight: 500;
        }

        .guide-card p a:hover {
            text-decoration-color: var(--accent2);
            color: var(--accent2);
        }

        .check-list {
            list-style: none;
            margin-top: 24px;
            background: rgba(6, 18, 24, 0.4);
            padding: 24px;
            border-radius: var(--radius-md);
        }

        .check-list li {
            position: relative;
            padding-left: 36px;
            margin-bottom: 12px;
            color: var(--text);
            font-size: 15px;
        }

        .check-list li:last-child {
            margin-bottom: 0;
        }

        .check-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 4px;
            width: 20px;
            height: 20px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a3e635' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
            background-size: contain;
            background-repeat: no-repeat;
        }

        /* FAQ ACCORDION */
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .section-header h2 {
            font-size: 32px;
            color: var(--text);
            display: inline-block;
            position: relative;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }

        .faq-wrapper {
            max-width: 900px;
            margin: 0 auto 80px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        details {
            background: var(--surface);
            border: 1px solid rgba(143, 173, 184, 0.15);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }

        details[open] {
            border-color: var(--accent);
            box-shadow: 0 4px 20px rgba(0,0,0,0.2);
        }

        summary {
            padding: 24px;
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text);
        }

        summary::-webkit-details-marker {
            display: none;
        }

        summary::after {
            content: '+';
            font-size: 24px;
            color: var(--accent);
            font-weight: 400;
            transition: transform 0.3s ease;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(34, 211, 238, 0.1);
            border-radius: 50%;
        }

        details[open] summary::after {
            transform: rotate(45deg);
            color: var(--accent2);
            background: rgba(163, 230, 53, 0.1);
        }

        details p {
            padding: 0 24px 24px;
            color: var(--muted);
            line-height: 1.7;
            margin: 0;
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 20px;
        }

        /* RELATED PAGES */
        .related-nav {
            background: var(--surface-light);
            padding: 60px 0;
            border-radius: var(--radius-lg);
            margin-bottom: 80px;
            border: 1px solid rgba(143, 173, 184, 0.1);
            position: relative;
            overflow: hidden;
        }

        .related-nav::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 100px;
            background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%230d2230' fill-opacity='1' d='M0,160L48,176C96,192,192,224,288,213.3C384,203,480,149,576,144C672,139,768,181,864,197.3C960,213,1056,203,1152,176C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E") bottom/cover no-repeat;
            opacity: 0.3;
            pointer-events: none;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            position: relative;
            z-index: 1;
            padding: 0 40px;
        }

        .related-link-card {
            background: rgba(6, 18, 24, 0.6);
            border: 1px solid rgba(34, 211, 238, 0.2);
            padding: 20px;
            border-radius: var(--radius-sm);
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100%;
            font-family: var(--font-display);
            font-weight: 600;
            color: var(--text);
            backdrop-filter: blur(5px);
        }

        .related-link-card:hover {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px var(--accent-glow);
        }

        /* CTA BLOCK */
        .cta-block {
            background: linear-gradient(135deg, var(--surface) 0%, #0a2e40 100%);
            border: 2px solid var(--accent);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            text-align: center;
            margin-bottom: 60px;
            position: relative;
            overflow: hidden;
        }

        .cta-block::after {
            content: '';
            position: absolute;
            top: -20px;
            right: -20px;
            width: 100px;
            height: 100px;
            background: var(--accent2);
            filter: blur(80px);
            opacity: 0.2;
            pointer-events: none;
        }

        .cta-block h2 {
            font-size: 36px;
            margin-bottom: 16px;
            color: var(--text);
        }

        .cta-block p {
            font-size: 18px;
            color: var(--muted);
            margin-bottom: 32px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-group {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 700;
            border-radius: 30px;
            text-transform: uppercase;
            letter-spacing: 1px;
            min-width: 180px;
            min-height: 44px;
        }

        .btn-primary {
            background: var(--accent);
            color: var(--bg);
            box-shadow: 0 4px 15px var(--accent-glow);
        }

        .btn-primary:hover {
            background: var(--text);
            color: var(--bg);
            box-shadow: 0 4px 20px rgba(240,250,255,0.4);
        }

        .btn-outline {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
        }

        .btn-outline:hover {
            background: rgba(34, 211, 238, 0.1);
            color: var(--text);
            border-color: var(--text);
        }

        /* FOOTER STYLES (Targeting Part A2 structure) */
        footer {
            background-color: #040c11;
            border-top: 1px solid rgba(143, 173, 184, 0.1);
            padding: 60px 0 20px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-brand p {
            color: var(--muted);
            margin-top: 15px;
            font-size: 14px;
            max-width: 300px;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .footer-links div {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a {
            color: var(--muted);
            font-size: 14px;
        }

        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(143, 173, 184, 0.1);
            color: var(--muted);
            font-size: 13px;
        }

        /* RESPONSIVE DESIGN */
        @media (max-width: 1024px) {
            .guide-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--surface);
                flex-direction: column;
                padding: 20px;
                gap: 15px;
                border-bottom: 1px solid rgba(34,211,238,0.2);
            }
            .nav-links.active {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 32px;
            }

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

            .related-grid {
                grid-template-columns: 1fr 1fr;
                padding: 0 20px;
            }

            .cta-block {
                padding: 40px 20px;
            }

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

        @media (max-width: 390px) {
            .hero h1 {
                font-size: 26px;
            }

            .intro-block {
                padding: 20px;
                font-size: 16px;
            }

            .guide-card {
                padding: 24px;
            }

            .guide-card h2 {
                font-size: 22px;
            }

            summary {
                font-size: 16px;
                padding: 16px;
            }

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

            .btn-group {
                flex-direction: column;
                width: 100%;
            }

            .btn {
                width: 100%;
            }

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


/* 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; }