:root {
            --bg: #f5f6f8;
            --surface: #ffffff;
            --surface-alt: #f9fafb;
            --border: #e5e7eb;
            --border-hover: #cbd5e1;
            --text: #1e293b;
            --text2: #64748b;
            --text3: #94a3b8;
            --accent: #3b82f6;
            --accent-light: #60a5fa;
            --accent-soft: #eff6ff;
            --green: #10b981;
            --green-soft: #ecfdf5;
            --orange: #f59e0b;
            --radius: 14px;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.06),0 1px 3px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 32px rgba(0,0,0,0.07),0 2px 6px rgba(0,0,0,0.03);
            --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background: var(--bg); color: var(--text); line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        .container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

        /* 导航栏——与首页完全一致 */
        .navbar {
            background: rgba(255,255,255,0.82); backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border);
            position: sticky; top: 0; z-index: 100;
        }
        .nav-inner {
            display: flex; align-items: center; justify-content: space-between;
            flex-wrap: wrap; gap: 8px; padding: 10px 0;
        }
        .logo { font-weight: 700; font-size: 1.25rem; color: var(--text); letter-spacing: -0.4px; white-space: nowrap; }
        .logo .dot { color: var(--accent); font-weight: 800; }
        .nav-links { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
        .nav-links a {
            color: var(--text2); text-decoration: none; padding: 7px 13px;
            border-radius: 20px; font-size: 0.88rem; font-weight: 500;
            transition: var(--transition); white-space: nowrap; letter-spacing: -0.1px;
        }
        .nav-links a:hover { color: var(--accent); background: var(--accent-soft); }
        .nav-links a.active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
        .nav-links a.nav-cta {
            background: var(--accent); color: #fff; border-radius: 20px;
            padding: 8px 18px; font-weight: 600; margin-left: 4px;
            box-shadow: 0 2px 12px rgba(59,130,246,0.25); transition: var(--transition);
        }
        .nav-links a.nav-cta:hover { background: #2563eb; box-shadow: 0 4px 20px rgba(59,130,246,0.35); transform: translateY(-1px); color: #fff; }
        .nav-flow-sep { color: var(--text3); font-size: 0.65rem; margin: 0 1px; user-select: none; pointer-events: none; }
        @media (max-width: 768px) {
            .nav-flow-sep { display: none; }
            .nav-links a { padding: 6px 10px; font-size: 0.78rem; border-radius: 16px; }
            .nav-links a.nav-cta { padding: 7px 14px; margin-left: 0; }
            .logo { font-size: 1.1rem; }
        }

        /* 页面顶部 */
        .page-hero {
            background: var(--surface); border: 1px solid var(--border);
            border-radius: 20px; padding: 36px 28px; margin: 28px 0 24px;
            box-shadow: var(--shadow-md); text-align: center;
        }
        .eyebrow { color: var(--accent); font-weight: 600; font-size: 0.85rem; letter-spacing: 0.4px; margin-bottom: 8px; }
        .page-hero h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.5px; margin: 0 0 8px; }
        .page-hero p { color: var(--text2); font-size: 1rem; max-width: 600px; margin: 0 auto; }

        /* 进度条 */
        .quest-progress {
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 16px 20px; margin: 0 0 20px; display: flex; align-items: center;
            gap: 12px; flex-wrap: wrap; box-shadow: var(--shadow-sm);
        }
        .progress-bar { flex: 1; height: 10px; background: var(--border); border-radius: 10px; overflow: hidden; }
        .progress-fill { height: 100%; width: 0%; background: var(--accent); border-radius: 10px; transition: width 0.3s ease; }
        .progress-stats { font-weight: 600; font-size: 0.9rem; color: var(--text2); }

        /* 任务选择器 */
        .quest-selector { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 20px; }
        .quest-tab {
            padding: 10px 20px; border-radius: 24px; background: var(--surface); border: 1px solid var(--border);
            font-weight: 600; cursor: pointer; font-size: 0.9rem; color: var(--text2); transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .quest-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
        .quest-tab:hover:not(.active) { border-color: var(--accent-light); color: var(--accent); }

        .quest-panel { display: none; }
        .quest-panel.active-panel { display: block; }

        /* 关卡卡片 */
        .step-card {
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 20px 22px; margin-bottom: 14px; box-shadow: var(--shadow-sm);
            display: flex; gap: 16px; align-items: flex-start; transition: var(--transition);
        }
        .step-card:hover { border-color: var(--accent-light); }
        .step-marker {
            width: 38px; height: 38px; border-radius: 50%; background: var(--accent-soft);
            color: var(--accent); font-weight: 700; font-size: 1.1rem;
            display: flex; align-items: center; justify-content: center; flex-shrink: 0;
        }
        .step-body { flex: 1; }
        .step-body h3 { font-size: 1.1rem; font-weight: 700; margin: 0 0 6px; letter-spacing: -0.2px; }
        .step-body p { color: var(--text2); font-size: 0.88rem; margin: 0 0 8px; line-height: 1.55; }
        .tip-inline {
            background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 10px 14px;
            border-radius: 6px; font-size: 0.82rem; color: var(--text); margin: 8px 0;
        }
        .code-snippet {
            background: #f1f5f9; border: 1px solid var(--border); border-radius: 8px;
            padding: 10px 14px; font-family: monospace; font-size: 0.8rem; color: var(--text);
            word-break: break-all; margin: 8px 0;
        }
        .img-mock {
            background: var(--surface-alt); border: 1px dashed var(--border); border-radius: 8px;
            padding: 14px; text-align: center; font-size: 0.8rem; color: var(--text3); margin: 8px 0;
        }
        .quest-check-label { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; margin-top: 8px; cursor: pointer; }

        /* 常见错误 */
        .mistakes-section { margin: 32px 0; }
        .mistake-card {
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 16px 20px; margin-bottom: 12px; display: flex; gap: 14px; align-items: flex-start;
            box-shadow: var(--shadow-sm); transition: var(--transition);
        }
        .mistake-card:hover { border-color: var(--border-hover); }
        .mistake-icon { font-size: 1.5rem; flex-shrink: 0; width: 32px; text-align: center; }
        .mistake-text h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
        .mistake-text p { color: var(--text2); font-size: 0.82rem; margin: 0; }

        /* 场景教学卡片 */
        .scene-teach {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 12px; margin: 24px 0;
        }
        .scene-card-link {
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 20px 16px; text-decoration: none; color: inherit; text-align: center;
            box-shadow: var(--shadow-sm); transition: var(--transition); display: block;
        }
        .scene-card-link:hover { border-color: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .scene-icon { font-size: 2rem; margin-bottom: 8px; }
        .scene-card-link h4 { font-weight: 700; font-size: 0.95rem; margin-bottom: 4px; }
        .scene-card-link p { color: var(--text2); font-size: 0.78rem; margin: 0; }

        /* 一键配置 */
        .oneclick-config {
            display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 20px 0 32px;
        }
        .config-card {
            background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
            padding: 16px 22px; text-decoration: none; color: var(--text); font-weight: 600;
            font-size: 0.9rem; display: flex; align-items: center; gap: 8px;
            box-shadow: var(--shadow-sm); transition: var(--transition);
        }
        .config-card:hover { border-color: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .cc-icon { font-size: 1.3rem; }

        /* CTA下载号召 */
        .cta-download {
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
            border: 1px solid #bfdbfe; border-radius: 20px; padding: 32px 24px;
            text-align: center; margin: 36px 0 20px;
        }
        .cta-download h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 6px; }
        .cta-download p { color: var(--text2); margin-bottom: 18px; }
        .btn-download-cta {
            display: inline-block; padding: 12px 28px; border-radius: 28px; font-weight: 700;
            text-decoration: none; background: var(--accent); color: #fff;
            box-shadow: 0 4px 16px rgba(59,130,246,0.3); transition: var(--transition);
        }
        .btn-download-cta:hover { background: #2563eb; transform: translateY(-2px); box-shadow: 0 6px 22px rgba(59,130,246,0.4); }

        /* Footer */
        .footer {
            border-top: 1px solid var(--border); padding: 22px 16px; text-align: center; background: var(--surface); margin-top: 20px;
        }
        .footer-links { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-bottom: 10px; }
        .footer-links a { color: var(--text2); text-decoration: none; font-size: 0.8rem; transition: var(--transition); }
        .footer-links a:hover { color: var(--accent); }
        .copyright { color: var(--text3); font-size: 0.7rem; }

        @media (max-width: 600px) {
            .page-hero h1 { font-size: 1.5rem; }
            .step-card { flex-direction: column; }
            .step-marker { margin-bottom: 6px; }
        }