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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'BlinkMacSystemFont', 'Segoe UI', Roboto, Helvetica, sans-serif;
            background: #FDF9F2;
            color: #2F3E46;
            line-height: 1.5;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 28px;
        }

        .header {
            background: rgba(253, 249, 242, 0.96);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid #F0E2D0;
        }

        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 18px 0;
            gap: 20px;
        }

        .logo {
            font-size: 2rem;
            font-weight: 750;
            background: linear-gradient(125deg, #8FAA80, #C49A6C);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            text-decoration: none;
        }

        .nav-links {
            display: flex;
            gap: 34px;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #5A6E5A;
            transition: 0.2s;
            font-size: 1rem;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: #C49A6C;
        }

        .page-hero {
            padding: 56px 0 40px;
            text-align: center;
            background: #FDF9F2;
        }

        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #4A6A3F;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }

        .page-hero .accent-text {
            background: linear-gradient(125deg, #C49A6C, #E2BB88);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }

        .page-hero p {
            font-size: 1.1rem;
            color: #6F7D6A;
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .breadcrumb {
            text-align: center;
            margin: 12px 0 0;
            font-size: 0.85rem;
            color: #A28C70;
        }
        .breadcrumb a {
            color: #8FAA80;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 36px;
            color: #4A6A3F;
            letter-spacing: -0.3px;
        }

        /* 原理卡片 */
        .principle-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
            margin-bottom: 48px;
        }
        .principle-card {
            background: #FFFEFB;
            border-radius: 28px;
            padding: 28px 24px;
            border: 1px solid #F0E4D2;
            text-align: center;
            transition: 0.25s;
        }
        .principle-card:hover {
            transform: translateY(-4px);
            border-color: #DCC8AA;
            box-shadow: 0 10px 24px -10px rgba(0,0,0,0.06);
        }
        .principle-icon {
            font-size: 2.2rem;
            margin-bottom: 16px;
            background: #F5EDE2;
            width: 64px;
            height: 64px;
            border-radius: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: auto;
            margin-right: auto;
        }
        .principle-card h3 {
            color: #4A6A3F;
            margin-bottom: 10px;
            font-size: 1.2rem;
        }
        .principle-card p {
            color: #6F7D6A;
            font-size: 0.92rem;
            line-height: 1.5;
        }

        /* 节点类型对比表 */
        .type-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .type-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            min-width: 600px;
            background: #FFFEFB;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 2px 20px rgba(0,0,0,0.03);
            border: 1px solid #F0E4D2;
            margin: 24px 0 48px;
        }
        .type-table th,
        .type-table td {
            padding: 16px 18px;
            text-align: left;
            font-size: 0.95rem;
            border-bottom: 1px solid #F3ECDE;
        }
        .type-table th {
            background: #FAF6EF;
            font-weight: 650;
            color: #5F7D52;
            font-size: 0.9rem;
            text-transform: uppercase;
        }
        .type-table tr:last-child td {
            border-bottom: none;
        }
        .tag {
            display: inline-block;
            background: #E8F0E3;
            color: #5A7D4A;
            font-size: 0.7rem;
            padding: 3px 10px;
            border-radius: 20px;
            font-weight: 600;
        }
        .tag-warn {
            background: #FFF2E6;
            color: #B07D4A;
        }

        /* 免费vs付费 */
        .compare-cards {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin: 24px 0 48px;
        }
        .compare-card {
            background: #FFFDF8;
            border-radius: 28px;
            padding: 32px 24px;
            border: 1px solid #F0E4D2;
            transition: 0.3s;
        }
        .compare-card:hover {
            border-color: #DCC8AA;
            transform: translateY(-3px);
        }
        .compare-card h4 {
            font-size: 1.3rem;
            color: #4A6A3F;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .compare-card ul {
            list-style: none;
            padding: 0;
            color: #5A6E5A;
        }
        .compare-card li {
            margin-bottom: 12px;
            display: flex;
            align-items: baseline;
            gap: 8px;
            font-size: 0.95rem;
        }
        .highlight {
            background: #FFF5E8;
            border: 1px solid #F0D9B8;
            border-radius: 28px;
            padding: 22px 24px;
            margin-top: 16px;
            color: #8A6B4A;
            font-weight: 500;
            font-size: 0.9rem;
        }

        /* 获取方式手风琴 */
        .accordion {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .accordion-item {
            background: #FFFDF8;
            border-radius: 24px;
            border: 1px solid #F0E4D2;
            overflow: hidden;
            transition: 0.2s;
        }
        .accordion-item[open] {
            border-color: #DCC8AA;
            box-shadow: 0 6px 18px -8px rgba(0,0,0,0.05);
        }
        .accordion-summary {
            padding: 20px 28px;
            font-weight: 650;
            font-size: 1.15rem;
            color: #4A6A3F;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            list-style: none;
            background: #FFFEFB;
            transition: 0.15s;
        }
        .accordion-summary::-webkit-details-marker {
            display: none;
        }
        .accordion-summary::before {
            content: '+';
            font-size: 1.5rem;
            color: #C49A6C;
            font-weight: 600;
            width: 28px;
            text-align: center;
            transition: 0.3s;
        }
        .accordion-item[open] .accordion-summary::before {
            content: '−';
        }
        .accordion-content {
            padding: 0 28px 28px;
            color: #5A6E5A;
            line-height: 1.7;
        }
        .accordion-content p {
            margin-bottom: 14px;
        }
        .accordion-content ul {
            padding-left: 22px;
            margin: 8px 0 18px;
        }
        .accordion-content li {
            margin-bottom: 10px;
        }

        /* 安全提示卡片 */
        .safety-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }
        .safety-card {
            background: #FFFEFB;
            border-radius: 20px;
            padding: 22px 20px;
            border: 1px solid #F0E4D2;
            transition: 0.2s;
        }
        .safety-card:hover {
            border-color: #DCC8AA;
            transform: translateY(-3px);
        }
        .safety-card h4 {
            color: #4A6A3F;
            margin-bottom: 8px;
            font-size: 1.1rem;
        }
        .safety-card p {
            font-size: 0.9rem;
            color: #6F7D6A;
            line-height: 1.5;
        }

        /* CTA */
        .cta-band {
            padding: 64px 0;
            background: linear-gradient(135deg, #FDF9F2 0%, #F8F1E6 100%);
            text-align: center;
            border-top: 1px solid #EDE3D2;
            border-bottom: 1px solid #EDE3D2;
        }
        .cta-band h2 {
            font-size: 2rem;
            font-weight: 750;
            color: #4A6A3F;
            margin-bottom: 14px;
            letter-spacing: -0.3px;
        }
        .cta-band p {
            font-size: 1.05rem;
            color: #6F7D6A;
            margin-bottom: 28px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-primary {
            background: #8FAA80;
            color: white;
            padding: 15px 42px;
            border-radius: 60px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.25s;
            box-shadow: 0 6px 14px rgba(143, 170, 128, 0.2);
            display: inline-block;
            font-size: 1.1rem;
        }
        .btn-primary:hover {
            background: #7A966A;
            transform: translateY(-2px);
        }

        .footer {
            background: #EDE4D6;
            color: #6A5C4D;
            padding: 56px 0 32px;
            font-size: 0.9rem;
            border-top: 1px solid #E0D2BE;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: #7B6B56;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            color: #896F52;
            text-decoration: none;
            margin-bottom: 10px;
            transition: 0.2s;
        }
        .footer-col a:hover {
            color: #C49A6C;
        }
        .copyright {
            text-align: center;
            padding-top: 28px;
            border-top: 1px solid #D9CAB4;
            color: #A28C70;
        }

        @media (max-width: 768px) {
            .navbar {
                flex-direction: column;
            }
            .nav-links {
                justify-content: center;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .compare-cards {
                grid-template-columns: 1fr;
            }
            .type-table th,
            .type-table td {
                padding: 10px 10px;
                font-size: 0.8rem;
            }
            .cta-band h2 {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .page-hero h1 {
                font-size: 1.8rem;
            }
        }