:root {
            --bg: #0e0e12;
            --bg-elevated: #16161c;
            --bg-card: #1c1c24;
            --bg-card-hover: #22222c;
            --border: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --gold: #c9a84c;
            --gold-light: #e2c87a;
            --gold-soft: rgba(201, 168, 76, 0.12);
            --gold-glow: rgba(201, 168, 76, 0.06);
            --cream: #f0ead6;
            --cream-muted: #c8c2ae;
            --text: #ece8de;
            --text-secondary: #9e9a8f;
            --text-muted: #6a6660;
            --accent-warm: #d4735a;
            --accent-warm-soft: rgba(212, 115, 90, 0.12);
            --accent-teal: #5a9e8f;
            --accent-teal-soft: rgba(90, 158, 143, 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='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%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 {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(14, 14, 18, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            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: 1.55rem;
            color: var(--cream);
            letter-spacing: -0.01em;
        }
        .logo em { color: var(--gold); font-style: italic; }
        .site-nav ul { display: flex; gap: 0.35rem; }
        .site-nav a {
            font-family: var(--font-mono);
            font-size: 0.78rem;
            color: var(--text-muted);
            padding: 0.5rem 1rem;
            border-radius: 6px;
            transition: all 0.2s ease;
            letter-spacing: 0.02em;
        }
        .site-nav a:hover { color: var(--cream); background: rgba(255,255,255,0.04); }
        .site-nav a[aria-current="page"] { color: var(--gold); background: var(--gold-soft); }

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

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 1.75rem;
            border-radius: 6px;
            font-family: var(--font-mono);
            font-size: 0.82rem;
            font-weight: 500;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
            background: transparent;
            color: var(--cream-muted);
            border: 1px solid var(--border-strong);
        }
        .btn:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-1px); }
        .btn-primary {
            background: var(--gold);
            color: var(--bg);
            border: none;
        }
        .btn-primary:hover {
            background: var(--gold-light);
            box-shadow: 0 8px 30px rgba(201,168,76,0.2);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 0.5rem 1.1rem;
            font-size: 0.72rem;
        }

        /* 页面头部 */
        .page-hero {
            padding: 4rem 0 2.5rem;
            text-align: center;
        }
        .page-hero h1 {
            font-family: var(--font-display);
            font-size: clamp(2.8rem, 6vw, 4rem);
            font-weight: 400;
            color: var(--cream);
            letter-spacing: -0.02em;
            margin-bottom: 1rem;
        }
        .page-hero h1 em { font-style: italic; color: var(--gold); }
        .page-hero .sub {
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 620px;
            margin: 0 auto;
            font-style: italic;
        }

        /* 创意型问题导航 */
        .problem-nav {
            padding: 2rem 0 3rem;
        }
        .problem-nav h2 {
            font-family: var(--font-display);
            font-size: 2rem;
            color: var(--cream);
            text-align: center;
            margin-bottom: 2rem;
        }
        .problem-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1rem;
        }
        .problem-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 1.6rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: var(--font-body);
            font-size: 0.95rem;
            color: var(--text-secondary);
        }
        .problem-card:hover {
            border-color: var(--gold);
            background: var(--bg-card-hover);
            transform: translateY(-3px);
            color: var(--cream);
        }
        .problem-card .emoji {
            font-size: 2rem;
            margin-bottom: 0.5rem;
            display: block;
        }

        /* 通用区块 */
        .section {
            padding: 5rem 0;
            border-top: 1px solid var(--border);
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-header h2 {
            font-family: var(--font-display);
            font-size: 2.6rem;
            font-weight: 400;
            color: var(--cream);
            letter-spacing: -0.02em;
        }
        .section-header h2 em { color: var(--gold); font-style: italic; }
        .section-header p {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0.8rem auto 0;
            font-size: 1rem;
        }

        /* 5分钟快速配置步骤 */
        .steps-container {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .step-item {
            display: grid;
            grid-template-columns: auto 1fr;
            gap: 1.5rem;
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1.8rem 2rem;
            transition: all 0.3s ease;
            position: relative;
        }
        .step-item:hover { border-color: var(--border-strong); background: var(--bg-card-hover); }
        .step-num {
            font-family: var(--font-display);
            font-size: 2.8rem;
            color: var(--gold);
            line-height: 1;
            opacity: 0.8;
            min-width: 60px;
        }
        .step-content h3 {
            font-family: var(--font-display);
            font-size: 1.4rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 0.5rem;
        }
        .step-content p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.8;
        }
        .step-content .note {
            margin-top: 0.8rem;
            padding: 0.7rem 1rem;
            border-left: 3px solid var(--accent-teal);
            background: var(--accent-teal-soft);
            border-radius: 0 6px 6px 0;
            font-size: 0.82rem;
            color: var(--accent-teal);
            font-family: var(--font-mono);
        }
        .step-content .warn {
            border-left-color: var(--accent-warm);
            background: var(--accent-warm-soft);
            color: var(--accent-warm);
        }

        /* 规则系统卡片 */
        .rule-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1px;
            background: var(--border);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
        }
        .rule-card {
            background: var(--bg-elevated);
            padding: 2rem;
            transition: background 0.35s;
        }
        .rule-card:hover { background: var(--bg-card-hover); }
        .rule-card .tag {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            background: var(--gold-soft);
            color: var(--gold);
            padding: 0.2rem 0.7rem;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 0.8rem;
        }
        .rule-card h4 {
            font-family: var(--font-display);
            font-size: 1.25rem;
            font-weight: 400;
            color: var(--cream);
            margin-bottom: 0.6rem;
        }
        .rule-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8; }

        /* TUN 模式可视化 */
        .tun-visual {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 2.5rem;
        }
        .tun-diagram {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.8rem;
        }
        .tun-node {
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            background: var(--bg-card);
            border: 1px solid var(--border-strong);
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--text-secondary);
            text-align: center;
            transition: all 0.3s;
        }
        .tun-node.highlight { border-color: var(--gold); color: var(--gold); background: var(--gold-soft); }
        .tun-arrow {
            color: var(--text-muted);
            font-size: 1.2rem;
        }
        .tun-text h3 {
            font-family: var(--font-display);
            font-size: 1.6rem;
            color: var(--cream);
            margin-bottom: 1rem;
        }
        .tun-text ul {
            display: flex;
            flex-direction: column;
            gap: 0.7rem;
        }
        .tun-text li {
            font-size: 0.9rem;
            color: var(--text-secondary);
            padding-left: 1.2rem;
            border-left: 2px solid var(--border);
            transition: border-color 0.2s;
        }
        .tun-text li:hover { border-left-color: var(--gold); }

        /* FAQ 手风琴 */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 10px;
            overflow: hidden;
            transition: border-color 0.25s;
        }
        .faq-item:hover { border-color: var(--border-strong); }
        .faq-item summary {
            padding: 1.2rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--cream);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after {
            content: '+';
            font-family: var(--font-mono);
            color: var(--gold);
            transition: transform 0.3s;
        }
        .faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }
        .faq-answer {
            padding: 0 1.5rem 1.2rem;
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.85;
        }

        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;
        }
        .footer-left { display: flex; align-items: center; gap: 2rem; }
        .footer-logo {
            font-family: var(--font-display);
            font-size: 1.15rem;
            color: var(--cream);
        }
        .footer-logo em { color: var(--gold); font-style: italic; }
        .footer-copy {
            font-family: var(--font-mono);
            font-size: 0.72rem;
            color: var(--text-muted);
        }
        .footer-links { display: flex; gap: 2rem; }
        .footer-links a {
            font-family: var(--font-mono);
            font-size: 0.76rem;
            color: var(--text-muted);
            transition: color 0.2s;
        }
        .footer-links a:hover { color: var(--gold); }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(24px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .section { animation: fadeUp 0.6s ease forwards; opacity: 0; }
        .section:nth-child(1) { animation-delay: 0.05s; }
        .section:nth-child(2) { animation-delay: 0.15s; }

        @media (max-width: 900px) {
            .problem-grid { grid-template-columns: 1fr 1fr; }
            .rule-grid { grid-template-columns: 1fr; }
            .tun-visual { grid-template-columns: 1fr; }
            .faq-grid { grid-template-columns: 1fr; }
            footer .container { flex-direction: column; gap: 1.5rem; text-align: center; }
            .footer-left { flex-direction: column; gap: 0.5rem; }
        }
        @media (max-width: 600px) {
            .container { padding: 0 1.25rem; }
            header .container { flex-direction: column; height: auto; padding: 0.75rem; gap: 0.5rem; }
            .step-item { grid-template-columns: 1fr; }
            .problem-grid { grid-template-columns: 1fr; }
        }