:root {
            --primary: #0ea5e9;
            --primary-deep: #0284c7;
            --primary-bright: #38bdf8;
            --primary-light: #7dd3fc;
            --primary-pale: #e0f2fe;
            --primary-surface: #f0f9ff;
            --accent: #f59e0b;
            --accent-warm: #fbbf24;
            --accent-light: #fef3c7;
            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --white: #ffffff;
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --bg-soft: #f1f5f9;
            --border-subtle: #e2e8f0;
            --border-card: #e8edf3;
            --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            --card-shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
            --card-hover-shadow: 0 16px 40px -10px rgba(14, 165, 233, 0.15);
            --radius-xl: 28px;
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 10px;
            --radius-full: 50px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans SC', sans-serif;
            background: var(--bg-main);
            color: var(--text-primary);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            font-size: 16px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* HEADER (与首页一致) */
        header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border-subtle);
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.03);
            transition: var(--transition);
        }
        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 12px 0;
            gap: 14px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            text-decoration: none;
        }
        .logo-icon {
            font-size: 28px;
            font-weight: 900;
            background: linear-gradient(135deg, #0ea5e9, #38bdf8);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1;
            letter-spacing: -0.5px;
        }
        .logo-text {
            font-weight: 750;
            font-size: 1.4rem;
            letter-spacing: -0.3px;
            background: linear-gradient(135deg, #0284c7, #0ea5e9);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .nav-links {
            display: flex;
            gap: 6px;
            align-items: center;
            flex-wrap: wrap;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 520;
            color: var(--text-secondary);
            transition: var(--transition);
            font-size: 0.9rem;
            padding: 7px 14px;
            border-radius: 22px;
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary-deep);
            background: var(--primary-pale);
        }
        .nav-links a.active {
            font-weight: 650;
            background: rgba(14, 165, 233, 0.12);
        }
        .nav-download-btn {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 18px !important;
            border-radius: 40px !important;
            font-weight: 620 !important;
            box-shadow: 0 2px 10px rgba(14, 165, 233, 0.3) !important;
        }
        .nav-download-btn:hover {
            background: var(--primary-deep) !important;
            box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4) !important;
            transform: translateY(-2px) !important;
        }

        /* HERO */
        .hero-section {
            padding: 44px 0 32px;
            text-align: center;
        }
        .hero-badge {
            background: var(--primary-pale);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 7px 16px;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary-deep);
            margin-bottom: 16px;
            border: 1px solid rgba(14, 165, 233, 0.2);
        }
        .hero-title {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 850;
            line-height: 1.18;
            background: linear-gradient(145deg, #0369a1 0%, #0ea5e9 50%, #38bdf8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 14px;
            letter-spacing: -0.5px;
        }
        .hero-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto 22px;
            line-height: 1.6;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-bottom: 20px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            padding: 11px 24px;
            border-radius: 44px;
            text-decoration: none;
            font-weight: 620;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 7px;
            font-size: 0.95rem;
            box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-deep);
            transform: translateY(-3px);
            box-shadow: 0 10px 28px rgba(14, 165, 233, 0.4);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
            padding: 10px 22px;
            border-radius: 44px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.95rem;
        }
        .btn-outline:hover {
            background: var(--primary-pale);
            border-color: var(--primary-deep);
            color: var(--primary-deep);
        }

        /* SECTION COMMONS */
        .section-title {
            text-align: center;
            font-size: clamp(1.6rem, 2.8vw, 2rem);
            font-weight: 750;
            margin-bottom: 10px;
            color: #0f172a;
            letter-spacing: -0.2px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 36px;
            font-size: 0.9rem;
            line-height: 1.55;
        }
        .section-divider {
            width: 50px;
            height: 4px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--primary), var(--primary-bright));
            margin: 0 auto 28px;
        }

        /* BASICS - 双栏文字 */
        .basics-section {
            padding: 36px 0;
        }
        .basics-content {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            padding: 32px 28px;
            border: 1px solid var(--border-card);
            box-shadow: var(--card-shadow);
            column-count: 2;
            column-gap: 32px;
            column-rule: 1px solid var(--border-subtle);
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .basics-content p {
            margin-bottom: 14px;
            break-inside: avoid;
        }
        .basics-content strong {
            color: var(--primary-deep);
        }
        @media (max-width: 768px) {
            .basics-content {
                column-count: 1;
                padding: 20px 16px;
                font-size: 0.88rem;
            }
        }

        /* RULE TYPES GRID */
        .rule-types-section {
            padding: 36px 0;
        }
        .rule-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
            gap: 20px;
        }
        .rule-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            border: 1px solid var(--border-card);
            box-shadow: var(--card-shadow);
            transition: var(--transition-slow);
            position: relative;
            overflow: hidden;
        }
        .rule-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--card-hover-shadow);
            border-color: #bae6fd;
        }
        .rule-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #0ea5e9, #38bdf8);
            opacity: 0;
            transition: var(--transition);
        }
        .rule-card:hover::before {
            opacity: 1;
        }
        .rule-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #0369a1;
            margin-bottom: 8px;
        }
        .rule-card .rule-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.55;
            margin-bottom: 12px;
        }
        .rule-card .rule-meta {
            font-size: 0.75rem;
            color: var(--primary-deep);
            font-weight: 600;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .rule-badge {
            background: var(--primary-pale);
            padding: 2px 8px;
            border-radius: 12px;
            white-space: nowrap;
        }

        /* RULE PROVIDER */
        .provider-section {
            padding: 36px 0;
        }
        .provider-content {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            padding: 32px 28px;
            border: 1px solid var(--border-card);
            box-shadow: var(--card-shadow);
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .provider-content h3 {
            font-size: 1.2rem;
            color: var(--primary-deep);
            margin: 20px 0 8px;
            font-weight: 700;
        }
        .provider-content ul {
            margin: 8px 0 16px 20px;
            list-style-type: disc;
        }
        .provider-content li {
            margin-bottom: 6px;
        }
        .provider-highlight {
            background: var(--primary-surface);
            border-left: 4px solid var(--primary);
            padding: 14px 18px;
            border-radius: 12px;
            margin: 16px 0;
        }

        /* POLICY GROUPS */
        .policy-section {
            padding: 36px 0;
        }
        .policy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
            gap: 18px;
        }
        .policy-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px 16px;
            border: 1px solid var(--border-card);
            box-shadow: var(--card-shadow);
            transition: var(--transition-slow);
            text-align: center;
        }
        .policy-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-hover-shadow);
            border-color: #bae6fd;
        }
        .policy-card .policy-icon {
            font-size: 2rem;
            margin-bottom: 8px;
        }
        .policy-card h4 {
            font-weight: 700;
            color: #0f172a;
        }
        .policy-card p {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.4;
            margin-top: 6px;
        }

        /* SCRIPT SECTION */
        .script-section {
            padding: 36px 0;
        }
        .script-showcase {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            padding: 32px 28px;
            border: 1px solid var(--border-card);
            box-shadow: var(--card-shadow);
        }
        .script-code {
            background: #1e293b;
            color: #e2e8f0;
            padding: 16px 20px;
            border-radius: 12px;
            font-family: 'Fira Code', 'Courier New', monospace;
            font-size: 0.85rem;
            overflow-x: auto;
            margin: 16px 0;
            white-space: pre-wrap;
        }
        .script-code .kw {
            color: #7dd3fc;
        }
        .script-code .str {
            color: #fbbf24;
        }

        /* DNS RELATION */
        .dns-relation-section {
            padding: 36px 0;
            text-align: center;
        }
        .dns-card-link {
            display: inline-block;
            background: var(--primary-pale);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            border: 1px solid #bae6fd;
            transition: var(--transition-slow);
            max-width: 600px;
        }
        .dns-card-link:hover {
            box-shadow: var(--card-hover-shadow);
            transform: translateY(-4px);
            border-color: var(--primary);
        }
        .dns-card-link h3 {
            font-weight: 700;
            color: var(--primary-deep);
        }
        .dns-card-link p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin: 8px 0 14px;
        }

        /* BOTTOM CTA */
        .bottom-cta-section {
            padding: 28px 0 44px;
        }
        .bottom-cta {
            background: linear-gradient(140deg, #0369a1 0%, #0ea5e9 40%, #38bdf8 100%);
            border-radius: var(--radius-xl);
            padding: 40px 26px;
            text-align: center;
            color: #fff;
            box-shadow: 0 18px 40px -10px rgba(14, 165, 233, 0.3);
            position: relative;
            overflow: hidden;
        }
        .bottom-cta::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -15%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .bottom-cta h2 {
            font-size: clamp(1.5rem, 2.6vw, 2rem);
            font-weight: 750;
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
        }
        .bottom-cta p {
            font-size: 0.95rem;
            opacity: 0.92;
            max-width: 520px;
            margin: 0 auto 20px;
            position: relative;
            z-index: 1;
        }
        .btn-cta-large {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff;
            color: #0369a1;
            padding: 13px 34px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            text-decoration: none;
            transition: var(--transition);
            position: relative;
            z-index: 1;
            box-shadow: 0 6px 22px rgba(0, 0, 0, 0.2);
        }
        .btn-cta-large:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 34px rgba(0, 0, 0, 0.3);
            background: #f0f9ff;
        }

        /* FOOTER */
        .footer {
            background: #0c1a2b;
            color: #94a3b8;
            padding: 40px 0 18px;
            border-top-left-radius: 24px;
            border-top-right-radius: 24px;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 24px;
        }
        .footer-content h4 {
            color: #e2e8f0;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }
        .footer-content p {
            font-size: 0.82rem;
            line-height: 1.55;
        }
        .footer-content a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-content a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 26px;
            font-size: 0.76rem;
            border-top: 1px solid #1e293b;
            margin-top: 16px;
            opacity: 0.7;
        }

        /* RESPONSIVE */
        @media (max-width: 768px) {
            .nav-bar {
                flex-direction: column;
                align-items: flex-start;
            }
            .nav-links a {
                font-size: 0.82rem;
                padding: 5px 10px;
            }
            .rule-grid,
            .policy-grid {
                grid-template-columns: 1fr;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
        }