:root {
            --bg-warm: #fdf8f2;
            --bg-card: #fffdf9;
            --bg-cream: #faf5ed;
            --text-deep: #2c221c;
            --text-mid: #5c4a38;
            --text-light: #7d6b56;
            --accent-amber: #c87d2c;
            --accent-deep: #9e5f1d;
            --accent-glow: #e8a44c;
            --link-teal: #2d7d6c;
            --link-teal-hover: #1e5c4e;
            --header-bg: #1f1a14;
            --header-text: #e8dcc8;
            --border-subtle: #e8ddd0;
            --shadow-card: 0 8px 22px -10px rgba(80, 40, 10, 0.10);
            --shadow-hover: 0 18px 32px -12px rgba(80, 40, 10, 0.18);
            --radius-lg: 1.8rem;
            --radius-md: 1.2rem;
            --radius-sm: 0.7rem;
            --font-stack: system-ui, -apple-system, 'Segoe UI', 'Roboto', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --code-bg: #f9f5f0;
            --code-border: #e8ddd0;
        }

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

        body {
            font-family: var(--font-stack);
            background: var(--bg-warm);
            color: var(--text-deep);
            line-height: 1.65;
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1260px;
            margin: 0 auto;
            padding: 0 1.8rem;
        }

        .skip-link {
            position: absolute;
            top: -100px;
            left: 1rem;
            background: var(--accent-amber);
            color: #fff;
            padding: 0.5rem 1rem;
            border-radius: 0 0 8px 8px;
            z-index: 200;
            transition: top 0.3s;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.85rem;
        }
        .skip-link:focus {
            top: 0;
        }

        /* Header */
        .site-header {
            background: var(--header-bg);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 4px 16px rgba(0, 0, 0, 0.25);
        }
        .navbar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0.85rem 0;
            gap: 1rem;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.65rem;
            text-decoration: none;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, #e8a44c 0%, #c87d2c 60%, #a05c18 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            color: #fff;
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 1.55rem;
            font-weight: 700;
            color: #e8dcc8;
            letter-spacing: -0.3px;
            white-space: nowrap;
        }
        .logo-badge {
            font-size: 0.65rem;
            background: rgba(232, 164, 76, 0.2);
            padding: 0.18rem 0.55rem;
            border-radius: 20px;
            color: #e8a44c;
            font-weight: 600;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            gap: 1.6rem;
            list-style: none;
            flex-wrap: wrap;
            align-items: center;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #c4b89a;
            transition: color var(--transition-fast);
            font-size: 0.95rem;
            white-space: nowrap;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: #e8a44c;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            right: 0;
            height: 2px;
            background: #e8a44c;
            border-radius: 1px;
        }

        /* Page Hero */
        .page-hero {
            padding: 3.5rem 0 2rem;
            text-align: center;
            background: var(--bg-cream);
            position: relative;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: -40px;
            left: 50%;
            transform: translateX(-50%);
            width: 480px;
            height: 480px;
            background: radial-gradient(circle at 50% 30%, rgba(200, 125, 44, 0.08) 0%, transparent 68%),
                radial-gradient(circle at 30% 60%, rgba(45, 125, 108, 0.05) 0%, transparent 58%);
            border-radius: 50%;
            pointer-events: none;
            z-index: 0;
        }
        .page-hero>* {
            position: relative;
            z-index: 1;
        }
        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(125deg, #3d2814 0%, #7a4e24 45%, #2d5c4e 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 0.7rem;
            letter-spacing: -0.02em;
        }
        .page-hero .hero-sub {
            font-size: 1.1rem;
            color: #5c4a38;
            max-width: 620px;
            margin: 0 auto 0.4rem;
            font-weight: 460;
        }
        .page-hero .hero-note {
            font-size: 0.9rem;
            color: #7d6b56;
            max-width: 580px;
            margin: 0 auto 1.2rem;
        }

        /* Content Sections */
        .kernel-content {
            padding: 3rem 0;
        }
        .kernel-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        .kernel-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 2.2rem 2rem;
            border: 1px solid var(--border-subtle);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            scroll-margin-top: 100px;
        }
        .kernel-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: #dcc8a8;
            background: #fffdf7;
        }
        .kernel-card h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: #3d2814;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .kernel-card p {
            color: #5c4a38;
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 0.9rem;
        }
        .kernel-card ul {
            list-style: none;
            margin: 0.8rem 0 1rem;
            padding-left: 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 0.3rem 1rem;
        }
        .kernel-card ul li {
            color: #5c4a38;
            font-size: 0.9rem;
            padding: 0.25rem 0;
        }
        .kernel-card ul li::before {
            content: '▸ ';
            color: var(--accent-amber);
            font-weight: 600;
        }
        .code-block {
            background: var(--code-bg);
            border: 1px solid var(--code-border);
            border-radius: var(--radius-md);
            padding: 1.2rem 1.4rem;
            font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
            font-size: 0.88rem;
            color: #4d3a28;
            overflow-x: auto;
            white-space: pre-wrap;
            word-break: break-word;
            line-height: 1.7;
            margin: 1rem 0;
        }
        .highlight-note {
            background: #fef7ed;
            border-left: 4px solid var(--accent-amber);
            padding: 0.8rem 1.2rem;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1rem 0;
            font-size: 0.88rem;
            color: #5c3a1e;
        }
        .highlight-note strong {
            color: #7a4e24;
        }
        .inline-link {
            color: var(--link-teal);
            text-decoration: none;
            font-weight: 500;
            border-bottom: 1px dotted var(--link-teal);
            transition: all var(--transition-fast);
        }
        .inline-link:hover {
            color: var(--link-teal-hover);
            border-bottom-style: solid;
        }
        .btn-outline-sm {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            padding: 0.5rem 1.3rem;
            border-radius: 22px;
            border: 1.5px solid #c8a278;
            color: #5c3a1e;
            text-decoration: none;
            font-weight: 500;
            font-size: 0.85rem;
            transition: all var(--transition-smooth);
            background: transparent;
            white-space: nowrap;
            margin-top: 0.5rem;
        }
        .btn-outline-sm:hover {
            background: rgba(200, 125, 44, 0.08);
            border-color: var(--accent-amber);
            color: #3d2814;
            transform: translateY(-1px);
        }

        /* Quick Nav */
        .quick-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            justify-content: center;
            margin: 1.5rem 0 2rem;
        }
        .quick-nav a {
            display: inline-block;
            padding: 0.4rem 1rem;
            border-radius: 18px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            color: #5c4a38;
            text-decoration: none;
            font-size: 0.82rem;
            font-weight: 500;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .quick-nav a:hover {
            background: #fffdf7;
            border-color: #dcc8a8;
            color: var(--accent-amber);
        }

        /* Footer */
        .site-footer {
            background: #1f1a14;
            color: #c4b89a;
            padding: 2.5rem 0;
            margin-top: 2rem;
            border-top: 1px solid #3d3224;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1.5rem;
            align-items: center;
        }
        .copyright {
            font-size: 0.82rem;
            color: #9e8d74;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
        }
        .footer-links a {
            color: #c4b89a;
            text-decoration: none;
            font-size: 0.85rem;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .footer-links a:hover {
            color: #e8a44c;
        }

        @media (max-width: 720px) {
            .container {
                padding: 0 1.1rem;
            }
            .navbar {
                flex-direction: column;
                gap: 0.6rem;
            }
            .nav-links {
                gap: 0.9rem;
                font-size: 0.85rem;
            }
            .page-hero h1 {
                font-size: 2rem;
            }
            .kernel-card {
                padding: 1.5rem 1.2rem;
            }
            .kernel-card h2 {
                font-size: 1.25rem;
            }
            .code-block {
                font-size: 0.8rem;
                padding: 1rem;
            }
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
            .footer-links {
                justify-content: center;
                gap: 0.8rem;
            }
        }