:root {
            --bg: #080d18;
            --bg-elevated: #0f1522;
            --bg-card: #141b2c;
            --bg-card-hover: #1a2338;
            --border: rgba(255, 255, 255, 0.06);
            --border-strong: rgba(255, 255, 255, 0.12);
            --amber: #e8945a;
            --amber-light: #f0b080;
            --amber-soft: rgba(232, 148, 90, 0.12);
            --amber-glow: rgba(232, 148, 90, 0.05);
            --cream: #f0ebe0;
            --cream-muted: #c8c0b4;
            --text: #e8e4db;
            --text-secondary: #a09b90;
            --text-muted: #6e6a62;
            --accent-indigo: #7b8fdb;
            --accent-indigo-soft: rgba(123, 143, 219, 0.12);
            --accent-teal: #4db8a0;
            --accent-teal-soft: rgba(77, 184, 160, 0.12);
            --font-display: 'Instrument Serif', Georgia, serif;
            --font-body: 'Source Serif 4', Georgia, serif;
            --font-mono: 'DM Mono', 'Courier New', monospace;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-body);
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            overflow-x: hidden;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }

        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E");
            pointer-events: none;
            z-index: 0;
        }

        a {
            color: inherit;
            text-decoration: none;
        }
        ul {
            list-style: none;
        }

        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 2.5rem;
        }

        /* Header — 与首页一致 */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(8, 13, 24, 0.9);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo {
            font-family: var(--font-display);
            font-size: 1.5rem;
            color: var(--cream);
            letter-spacing: -0.01em;
        }
        .logo em {
            color: var(--amber);
            font-style: italic;
        }
        .site-nav ul {
            display: flex;
            gap: 0.3rem;
            flex-wrap: wrap;
        }
        .site-nav a {
            font-family: var(--font-mono);
            font-size: 0.76rem;
            color: var(--text-muted);
            padding: 0.45rem 0.9rem;
            border-radius: 6px;
            transition: all 0.2s ease;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .site-nav a:hover {
            color: var(--cream);
            background: rgba(255, 255, 255, 0.03);
        }
        .site-nav a[aria-current="page"] {
            color: var(--amber);
            background: var(--amber-soft);
        }

        main {
            position: relative;
            z-index: 1;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.6rem;
            border-radius: 6px;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            font-weight: 500;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--amber);
            color: #0a0f1a;
        }
        .btn-primary:hover {
            background: var(--amber-light);
            transform: translateY(-1px);
            box-shadow: 0 8px 28px rgba(232, 148, 90, 0.22);
        }
        .btn-outline {
            background: transparent;
            color: var(--cream-muted);
            border: 1px solid var(--border-strong);
        }
        .btn-outline:hover {
            border-color: var(--amber);
            color: var(--amber);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 0.45rem 1rem;
            font-size: 0.68rem;
            letter-spacing: 0.04em;
        }

        /* Page Hero */
        .page-hero {
            padding: 5rem 0 3.5rem;
            position: relative;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            top: -10%;
            right: -5%;
            width: 550px;
            height: 550px;
            background: radial-gradient(circle, rgba(123, 143, 219, 0.05) 0%, transparent 55%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }
        .page-hero-overline {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--amber);
            letter-spacing: 0.22em;
            text-transform: uppercase;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .page-hero-overline::before {
            content: '';
            width: 28px;
            height: 1px;
            background: var(--amber);
        }
        .page-hero h1 {
            font-family: var(--font-display);
            font-size: clamp(2.8rem, 6vw, 4.2rem);
            font-weight: 400;
            line-height: 1.05;
            letter-spacing: -0.02em;
            color: var(--cream);
            margin-bottom: 0.8rem;
        }
        .page-hero h1 em {
            font-style: italic;
            color: var(--amber);
        }
        .page-hero .hero-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 620px;
            line-height: 1.9;
            margin-bottom: 2rem;
        }
        .hero-quick-links {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
        }
        .hero-quick-links a {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            padding: 0.4rem 0.85rem;
            border-radius: 5px;
            background: var(--bg-card);
            color: var(--text-muted);
            border: 1px solid var(--border);
            transition: all 0.25s ease;
            letter-spacing: 0.04em;
        }
        .hero-quick-links a:hover {
            border-color: var(--amber);
            color: var(--amber);
            background: var(--amber-soft);
        }

        /* Section Header */
        .section-header {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: end;
            margin-bottom: 3rem;
        }
        .section-header h2 {
            font-family: var(--font-display);
            font-size: clamp(2.2rem, 3.8vw, 2.8rem);
            font-weight: 400;
            line-height: 1.1;
            color: var(--cream);
            letter-spacing: -0.02em;
        }
        .section-header h2 em {
            font-style: italic;
            color: var(--amber);
        }
        .section-header p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            max-width: 380px;
        }

        /* History / Relationship Section */
        .history-section {
            padding: 5rem 0;
            border-top: 1px solid var(--border);
        }
        .history-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        .history-text h3 {
            font-family: var(--font-display);
            font-size: 1.6rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
        }
        .history-text p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 2;
            margin-bottom: 1rem;
        }
        .history-text strong {
            color: var(--cream);
            font-weight: 500;
        }
        .history-diagram {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 2rem;
            position: relative;
            overflow: hidden;
        }
        .history-diagram svg {
            width: 100%;
            height: auto;
            max-width: 400px;
            display: block;
            margin: 0 auto;
        }

        /* Client Comparison Table */
        .compare-section {
            padding: 5rem 0;
            border-top: 1px solid var(--border);
        }
        .compare-table-wrap {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            font-family: var(--font-mono);
            font-size: 0.74rem;
        }
        .compare-table thead th {
            background: var(--bg-card);
            color: var(--text-muted);
            font-weight: 500;
            padding: 1rem 1.3rem;
            text-align: left;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            font-size: 0.66rem;
            border-bottom: 1px solid var(--border);
        }
        .compare-table tbody td {
            padding: 0.9rem 1.3rem;
            border-bottom: 1px solid var(--border);
            color: var(--text-secondary);
            vertical-align: middle;
        }
        .compare-table tbody tr:hover td {
            background: var(--bg-card-hover);
        }
        .compare-table tbody tr:last-child td {
            border-bottom: none;
        }
        .compare-table .client-name {
            color: var(--cream);
            font-weight: 500;
        }
        .compare-table .tag {
            display: inline-block;
            font-size: 0.6rem;
            padding: 0.15rem 0.45rem;
            border-radius: 3px;
            letter-spacing: 0.05em;
            margin-right: 0.3rem;
        }
        .tag-win {
            background: var(--accent-indigo-soft);
            color: var(--accent-indigo);
        }
        .tag-mac {
            background: var(--amber-soft);
            color: var(--amber);
        }
        .tag-android {
            background: var(--accent-teal-soft);
            color: var(--accent-teal);
        }
        .tag-linux {
            background: rgba(160, 140, 200, 0.15);
            color: #b8a8d8;
        }

        /* Kernel Mechanism */
        .kernel-section {
            padding: 5rem 0;
            border-top: 1px solid var(--border);
        }
        .kernel-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.2rem;
        }
        .kernel-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 2rem 1.8rem;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        .kernel-card:hover {
            border-color: var(--border-strong);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
        }
        .kernel-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0;
            height: 2px;
            transition: width 0.4s ease;
        }
        .kernel-card:nth-child(1)::before {
            background: var(--amber);
        }
        .kernel-card:nth-child(2)::before {
            background: var(--accent-indigo);
        }
        .kernel-card:nth-child(3)::before {
            background: var(--accent-teal);
        }
        .kernel-card:hover::before {
            width: 100%;
        }
        .kernel-card h3 {
            font-family: var(--font-display);
            font-size: 1.35rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }
        .kernel-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        /* Network Principles */
        .network-section {
            padding: 5rem 0;
            border-top: 1px solid var(--border);
        }
        .network-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.2rem;
        }
        .network-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 2rem;
            transition: all 0.3s ease;
        }
        .network-card:hover {
            border-color: var(--border-strong);
            background: var(--bg-card-hover);
        }
        .network-card h3 {
            font-family: var(--font-display);
            font-size: 1.25rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 0.6rem;
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .network-card h3 .nw-icon {
            font-size: 1.4rem;
        }
        .network-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.85;
        }

        /* CTA */
        .cta-section {
            padding: 2rem 0 5rem;
        }
        .cta-box {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 2.5rem;
            align-items: center;
            padding: 3rem;
            border: 1px solid var(--amber);
            border-radius: 12px;
            position: relative;
            overflow: hidden;
            background: var(--bg-elevated);
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 80% 50%, rgba(232, 148, 90, 0.04) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-box h2 {
            font-family: var(--font-display);
            font-size: 1.8rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 0.3rem;
            position: relative;
        }
        .cta-box p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            max-width: 440px;
            position: relative;
        }
        .cta-box .btn {
            position: relative;
            white-space: nowrap;
        }

        /* Footer — 与首页一致 */
        footer {
            border-top: 1px solid var(--border);
            padding: 3rem 0;
            position: relative;
            z-index: 1;
        }
        footer .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .footer-left {
            display: flex;
            align-items: center;
            gap: 2rem;
            flex-wrap: wrap;
        }
        .footer-logo {
            font-family: var(--font-display);
            font-size: 1.1rem;
            color: var(--cream);
        }
        .footer-logo em {
            color: var(--amber);
            font-style: italic;
        }
        .footer-copy {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--text-muted);
        }
        .footer-links {
            display: flex;
            gap: 1.8rem;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-family: var(--font-mono);
            font-size: 0.73rem;
            color: var(--text-muted);
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--amber);
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .anim-up {
            animation: fadeUp 0.6s ease forwards;
        }

        /* Responsive */
        @media (max-width: 1000px) {
            .kernel-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 900px) {
            .section-header {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .history-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .network-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                grid-template-columns: 1fr;
                text-align: center;
                padding: 2.5rem 1.8rem;
            }
            .cta-box p {
                max-width: 100%;
                margin: 0 auto;
            }
            .page-hero h1 {
                font-size: 2.3rem;
            }
        }
        @media (max-width: 600px) {
            .container {
                padding: 0 1.1rem;
            }
            header .container {
                flex-direction: column;
                height: auto;
                padding-top: 0.7rem;
                padding-bottom: 0.7rem;
                gap: 0.4rem;
            }
            .site-nav a {
                font-size: 0.66rem;
                padding: 0.3rem 0.5rem;
            }
            .kernel-grid {
                grid-template-columns: 1fr;
            }
            .compare-table {
                font-size: 0.62rem;
            }
            .compare-table thead th,
            .compare-table tbody td {
                padding: 0.6rem 0.7rem;
            }
            .cta-box {
                padding: 2rem 1.2rem;
            }
            .cta-box h2 {
                font-size: 1.4rem;
            }
            .page-hero h1 {
                font-size: 1.9rem;
            }
            footer .container {
                flex-direction: column;
                text-align: center;
            }
            .footer-left {
                flex-direction: column;
                gap: 0.4rem;
            }
            .footer-links {
                justify-content: center;
                gap: 1.2rem;
            }
            .hero-quick-links {
                gap: 0.4rem;
            }
            .hero-quick-links a {
                font-size: 0.64rem;
                padding: 0.3rem 0.6rem;
            }
        }