:root {
            --bg: #faf8f5;
            --surface: #ffffff;
            --text: #1e2d2f;
            --text-secondary: #4d5e61;
            --text-muted: #6b7c7f;
            --accent: #c85a3c;
            --accent-dark: #a3442a;
            --accent-light: #fdf0eb;
            --teal: #3d6b6e;
            --teal-light: #e8f2f3;
            --border: #e8e3dd;
            --border-light: #f0ece8;
            --shadow-sm: 0 1px 4px rgba(30, 45, 47, 0.04);
            --shadow-md: 0 6px 20px rgba(30, 45, 47, 0.06);
            --shadow-lg: 0 16px 36px rgba(30, 45, 47, 0.09);
            --radius-sm: 16px;
            --radius-md: 24px;
            --radius-lg: 36px;
            --radius-xl: 48px;
            --radius-full: 999px;
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: 'Inter', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-stack);
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            background-image:
                radial-gradient(ellipse at 15% 10%, rgba(200, 90, 60, 0.025) 0%, transparent 55%),
                radial-gradient(ellipse at 78% 60%, rgba(61, 107, 110, 0.02) 0%, transparent 50%),
                radial-gradient(ellipse at 40% 85%, rgba(200, 90, 60, 0.018) 0%, transparent 45%);
            background-attachment: fixed;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 28px;
        }

        header {
            background: rgba(255, 255, 255, 0.82);
            backdrop-filter: blur(18px);
            position: sticky;
            top: 0;
            z-index: 120;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }

        .nav-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 16px 0;
            gap: 14px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--accent);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 1.25rem;
            box-shadow: 0 4px 14px rgba(200, 90, 60, 0.28);
        }
        .logo-text {
            font-weight: 780;
            font-size: 1.35rem;
            color: var(--text);
            letter-spacing: -0.4px;
        }
        .logo-text span {
            color: var(--accent);
        }

        .nav-links {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
            font-size: 0.93rem;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: var(--text-secondary);
            transition: var(--transition);
            padding: 7px 15px;
            border-radius: var(--radius-full);
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent);
            background: var(--accent-light);
        }
        .btn-download-nav {
            background: var(--accent) !important;
            color: #fff !important;
            padding: 9px 22px !important;
            font-weight: 600 !important;
            box-shadow: 0 3px 12px rgba(200, 90, 60, 0.22);
        }
        .btn-download-nav:hover {
            background: var(--accent-dark) !important;
            transform: translateY(-2px);
        }

        .page-hero {
            padding: 42px 0 32px;
            text-align: center;
        }
        .page-hero h1 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text);
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .page-hero h1 .accent {
            color: var(--accent);
            position: relative;
            display: inline-block;
        }
        .page-hero h1 .accent::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            width: 100%;
            height: 6px;
            background: rgba(200, 90, 60, 0.16);
            border-radius: 4px;
            z-index: -1;
        }
        .page-hero .subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 24px;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 13px 30px;
            border-radius: var(--radius-full);
            text-decoration: none;
            font-weight: 620;
            display: inline-flex;
            align-items: center;
            gap: 7px;
            box-shadow: 0 8px 22px rgba(200, 90, 60, 0.26);
            transition: var(--transition);
            font-size: 1rem;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 14px 30px rgba(200, 90, 60, 0.34);
        }

        .section {
            padding: 38px 0 44px;
        }
        .section-title {
            font-size: clamp(1.5rem, 2.8vw, 2rem);
            font-weight: 750;
            margin-bottom: 10px;
            color: var(--text);
            letter-spacing: -0.3px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 3.5px;
            background: var(--accent);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 36px;
            font-size: 0.95rem;
            max-width: 580px;
            margin-left: auto;
            margin-right: auto;
        }

        .prose-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 34px 32px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-light);
            margin-bottom: 30px;
        }
        .prose-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--teal);
            margin: 18px 0 8px;
            letter-spacing: -0.2px;
        }
        .prose-card h3:first-child {
            margin-top: 0;
        }
        .prose-card p {
            color: var(--text-secondary);
            margin-bottom: 12px;
            font-size: 0.96rem;
            line-height: 1.7;
        }

        .compare-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
            background: var(--surface);
            border: 1px solid var(--border-light);
            margin-bottom: 30px;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 650px;
        }
        .compare-table th {
            background: #faf7f3;
            padding: 16px 18px;
            font-weight: 680;
            font-size: 0.9rem;
            color: var(--text);
            border-bottom: 2px solid var(--border);
            text-align: left;
        }
        .compare-table td {
            padding: 15px 18px;
            border-bottom: 1px solid var(--border-light);
            font-size: 0.9rem;
            color: var(--text-secondary);
            vertical-align: middle;
        }
        .compare-table tbody tr:hover {
            background: #fefcf9;
        }
        .tag {
            display: inline-block;
            padding: 3px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
        }
        .tag-cfw {
            background: #fceae4;
            color: #a3442a;
        }
        .tag-verge {
            background: #e4f0f3;
            color: #2a5a5e;
        }

        .feature-dual {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-bottom: 30px;
        }
        .feature-panel {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .feature-panel:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .feature-panel h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
        }
        .feature-panel ul {
            list-style: none;
            padding: 0;
        }
        .feature-panel ul li {
            padding: 6px 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
        }
        .feature-panel ul li:last-child {
            border-bottom: none;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 18px;
        }
        .related-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            padding: 22px 14px;
            text-decoration: none;
            color: inherit;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover {
            border-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .related-card .rel-icon {
            font-size: 2rem;
            margin-bottom: 8px;
        }
        .related-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
        }

        .footer {
            background: #1a2526;
            color: #b5c4c6;
            padding: 44px 0 24px;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 12px;
            font-size: 0.95rem;
        }
        .footer-col a {
            color: #b5c4c6;
            text-decoration: none;
            display: block;
            margin-bottom: 7px;
            font-size: 0.87rem;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            font-size: 0.82rem;
            border-top: 1px solid #334546;
            margin-top: 24px;
            color: #8a9c9e;
        }

        @media (max-width: 860px) {
            .nav-bar {
                flex-direction: column;
                align-items: stretch;
            }
            .nav-links {
                gap: 6px;
                font-size: 0.84rem;
            }
            .feature-dual {
                grid-template-columns: 1fr;
            }
            .prose-card {
                padding: 24px 18px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
        }