/* ========== CSS Reset & 变量 ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --primary: #6366F1;
            --primary-deep: #4F46E5;
            --primary-dark: #3730A3;
            --accent: #14B8A6;
            --accent-glow: #5EEAD4;
            --bg: #F9FAFB;
            --surface: #FFFFFF;
            --surface-alt: #F1F5F9;
            --text: #1E293B;
            --text-secondary: #64748B;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            min-height: 100vh;
        }

        /* ========== Header ========== */
        header {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-sm);
        }
        .header-box {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 60px;
            gap: 20px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
            transition: var(--transition);
        }
        .brand-logo:hover { color: var(--primary); }
        .brand-logo img {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            object-fit: contain;
        }
        .brand-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
            margin: 0 2px;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,100% { opacity:1; transform:scale(1); }
            50% { opacity:0.4; transform:scale(1.6); }
        }
        nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 8px 14px;
            border-radius: 8px;
            transition: var(--transition);
            white-space: nowrap;
        }
        nav a:hover { color: var(--primary); background: #EEF2FF; }
        nav a.current-tab { color: var(--primary); background: #EEF2FF; font-weight: 600; }
        .nav-accent { background: linear-gradient(135deg, #EEF2FF, #E0F2FE); color: var(--primary-deep) !important; font-weight: 600 !important; }

        /* ========== Main ========== */
        main { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

        .section-inner { max-width: 1100px; margin: 0 auto; padding: 60px 0; }
        section h2 { font-size: 2rem; font-weight: 800; letter-spacing: -0.5px; text-align: center; margin-bottom: 12px; color: var(--text); }
        .section-lead { text-align: center; color: var(--text-secondary); font-size: 1.05rem; max-width: 680px; margin: 0 auto 40px; line-height: 1.8; }

        /* Hero */
        .page-hero { padding: 48px 0 40px; text-align: center; max-width: 800px; margin: 0 auto; }
        .badge { display: inline-block; background: #EEF2FF; color: var(--primary-deep); font-weight: 600; font-size: 0.85rem; padding: 6px 16px; border-radius: 20px; margin-bottom: 16px; border: 1px solid #C7D2FE; }
        .page-hero h1 { font-size: 2.6rem; font-weight: 900; letter-spacing: -1px; line-height: 1.25; margin-bottom: 16px; }
        .gradient-text { background: linear-gradient(135deg, #6366F1, #14B8A6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .desc { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px; }
        .quick-jump { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
        .quick-jump a { background: var(--surface); border: 1px solid var(--border); padding: 8px 18px; border-radius: 20px; text-decoration: none; color: var(--text-secondary); font-weight: 500; font-size: 0.9rem; transition: var(--transition); }
        .quick-jump a:hover { border-color: var(--primary); color: var(--primary); background: #EEF2FF; }

        /* 通用卡片 */
        .card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin-top: 24px; }
        .info-card { background: var(--surface); border-radius: var(--radius-lg); padding: 24px 22px; border: 1px solid var(--border-light); transition: var(--transition); box-shadow: var(--shadow-sm); }
        .info-card:hover { box-shadow: var(--shadow-lg); border-color: #C7D2FE; transform: translateY(-2px); }
        .info-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--primary-deep); margin-bottom: 10px; }
        .info-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
        .info-card code { background: #F1F5F9; padding: 2px 6px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--primary-dark); }

        /* 分步安装 Tab */
        .install-tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 24px; flex-wrap: wrap; }
        .tab-btn { background: var(--surface); border: 1px solid var(--border); padding: 10px 22px; border-radius: 28px; font-weight: 600; cursor: pointer; transition: var(--transition); font-size: 0.9rem; color: var(--text-secondary); }
        .tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
        .tab-panel { display: none; }
        .tab-panel.active { display: block; }
        .step-list { list-style: none; }
        .step-list li { display: flex; gap: 16px; margin-bottom: 20px; background: var(--surface); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow-sm); border-left: 4px solid var(--primary); transition: var(--transition); }
        .step-list li:hover { box-shadow: var(--shadow); }
        .step-num { font-weight: 900; font-size: 1.8rem; color: #C7D2FE; line-height: 1; min-width: 40px; }
        .step-content h4 { font-weight: 700; margin-bottom: 4px; }
        .step-content p { color: var(--text-secondary); font-size: 0.9rem; }

        /* 界面导览 */
        .ui-tour { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; justify-content: center; background: var(--surface); border-radius: var(--radius-xl); padding: 32px; box-shadow: var(--shadow); }
        .ui-tour .text { flex: 1 1 300px; }
        .ui-tour .text h3 { font-size: 1.4rem; margin-bottom: 12px; }
        .ui-tour .text p { color: var(--text-secondary); margin-bottom: 10px; }
        .ui-tour .mock-ui { flex: 1 1 300px; background: #F8FAFC; border-radius: var(--radius); padding: 20px; border: 1px dashed var(--border); font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary); }

        /* 参数实验室 */
        .param-lab { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
        .param-card { background: var(--surface); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border-light); transition: var(--transition); }
        .param-card:hover { box-shadow: var(--shadow); border-color: #C7D2FE; }
        .param-card .param-name { font-weight: 700; font-family: var(--font-mono); color: var(--primary-deep); }
        .param-card .param-desc { font-size: 0.85rem; color: var(--text-secondary); margin: 8px 0; }
        .param-card .param-value { background: #F1F5F9; padding: 6px 10px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.8rem; }

        /* 排错决策树 */
        .troubleshoot-flow { background: var(--surface); border-radius: var(--radius-xl); padding: 32px; box-shadow: var(--shadow); }
        .flow-step { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-start; margin-bottom: 24px; }
        .flow-step .question { background: #EEF2FF; border-radius: 20px; padding: 8px 18px; font-weight: 600; color: var(--primary-deep); }
        .flow-step .answer { flex: 1; padding: 10px 16px; background: #F8FAFC; border-radius: var(--radius); }

        /* Footer */
        footer { background: #1E293B; color: #CBD5E1; margin-top: 32px; padding: 48px 24px 32px; }
        .footer-wrapper { max-width: 1280px; margin: 0 auto; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 28px; margin-bottom: 32px; }
        .footer-section h5 { font-size: 0.95rem; font-weight: 700; color: #F1F5F9; margin-bottom: 12px; }
        .footer-section ul { list-style: none; }
        .footer-section ul li { margin-bottom: 6px; }
        .footer-section ul li a { color: #94A3B8; text-decoration: none; font-size: 0.85rem; transition: var(--transition); }
        .footer-section ul li a:hover { color: #E2E8F0; text-decoration: underline; }
        .footer-legal { border-top: 1px solid #334155; padding-top: 20px; text-align: center; font-size: 0.8rem; color: #64748B; line-height: 1.8; }

        @media (max-width: 768px) {
            .header-box { flex-direction: column; height: auto; padding: 12px 16px; }
            .page-hero h1 { font-size: 1.9rem; }
            section h2 { font-size: 1.5rem; }
            .section-inner { padding: 36px 16px; }
        }