/* 极简重置 —— 与首页/下载页风格完全统一，加载极速 */
        *{margin:0;padding:0;box-sizing:border-box;}
        body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;background:#f5f7fc;color:#1e1f2a;line-height:1.5;-webkit-font-smoothing:antialiased;}
        .wrapper{max-width:1200px;margin:0 auto;padding:0 24px;}
        .nav-bar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:18px 0;border-bottom:1px solid rgba(0,0,0,0.05);}
        .logo-area{font-weight:700;font-size:1.5rem;letter-spacing:-0.02em;background:linear-gradient(135deg,#0b1c3a 0%,#2a5c9e 100%);-webkit-background-clip:text;background-clip:text;color:transparent;}
        .logo-area span{font-weight:400;font-size:0.9rem;color:#5e6f8d;margin-left:6px;background:none;-webkit-background-clip:unset;background-clip:unset;color:#5e6f8d;}
        .nav-links{display:flex;gap:28px;font-weight:500;}
        .nav-links a{text-decoration:none;color:#2c3e50;font-size:1rem;transition:color 0.15s;}
        .nav-links a:hover{color:#1e5fd9;}
        .nav-links a.active{color:#1e5fd9;font-weight:600;border-bottom:2px solid #1e5fd9;padding-bottom:4px;}
        .nav-download-btn{background:#1e5fd9;color:white !important;padding:10px 22px;border-radius:60px;font-weight:600;font-size:0.95rem;box-shadow:0 6px 14px rgba(30,95,217,0.25);transition:all 0.2s;border:none;display:inline-block;text-decoration:none;}
        .nav-download-btn:hover{background:#154bb5;transform:translateY(-1px);box-shadow:0 10px 20px rgba(30,95,217,0.3);}
        
        /* 页面头部 */
        .page-header{margin:40px 0 20px;}
        .page-header h1{font-size:2.5rem;font-weight:700;letter-spacing:-0.02em;color:#0a1a2b;max-width:900px;}
        .page-header .subhead{font-size:1.2rem;color:#406180;margin-top:12px;border-left:4px solid #1e5fd9;padding-left:20px;max-width:720px;}

        /* 场景说明卡片 */
        .scene-card{background:linear-gradient(105deg,#ffffff 0%,#f2f8ff 100%);border-radius:32px;padding:24px 32px;margin:30px 0;display:flex;flex-wrap:wrap;gap:20px;align-items:center;border:1px solid #d9e6ff;}
        .scene-text{flex:2;}
        .scene-text h3{font-size:1.6rem;margin-bottom:8px;}
        .scene-tags{display:flex;gap:15px;margin-top:12px;}
        .tag{background:#e0ebff;padding:6px 18px;border-radius:40px;font-weight:500;}
        .scene-visual{font-size:3.5rem;}

        /* 平台切换tab (创意：轻量tab无JS，仅视觉区分) */
        .platform-tabs{display:flex;gap:10px;margin:30px 0 10px;}
        .tab-item{background:white;padding:10px 24px;border-radius:40px;font-weight:600;color:#1e5fd9;border:1.5px solid #1e5fd9;cursor:default;}
        .tab-item.active-tab{background:#1e5fd9;color:white;}

        /* 教程步骤卡片 (每个平台一个区块) */
        .tutorial-platform{margin-bottom:48px;background:#ffffff;border-radius:32px;padding:28px 30px;box-shadow:0 15px 30px -8px rgba(0,20,50,0.06);}
        .platform-title{display:flex;align-items:center;gap:12px;font-size:2rem;font-weight:700;margin-bottom:16px;}
        .step-container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:30px 0;}
        .step-card{background:#fafcff;border-radius:24px;padding:22px 16px;border:1px solid #e7eefc;transition:all 0.2s;}
        .step-card:hover{border-color:#1e5fd9;}
        .step-num-lg{width:44px;height:44px;background:#1e5fd9;color:white;border-radius:30px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.5rem;margin-bottom:16px;}
        .step-card h4{font-size:1.3rem;margin-bottom:8px;}
        .step-desc{color:#3e5f7e;margin-bottom:16px;}
        .step-img-placeholder{background:#e1ebfa;border-radius:20px;padding:18px 10px;text-align:center;font-size:2.2rem;color:#1e5fd9;border:1px dashed #a0bde0;}

        /* 错误处理模块 (创意混合) */
        .error-module{background:#fff7e6;border-radius:28px;padding:28px 32px;margin:30px 0;border-left:8px solid #f0b400;}
        .error-module h3{font-size:1.8rem;margin-bottom:20px;display:flex;align-items:center;gap:12px;}
        .error-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
        .error-item{background:white;border-radius:20px;padding:18px 22px;box-shadow:0 4px 10px rgba(0,0,0,0.02);}
        .error-item strong{display:block;font-size:1.2rem;margin-bottom:10px;color:#a16400;}

        /* 嵌入式小FAQ */
        .mini-faq{background:#eef2fa;border-radius:24px;padding:24px 30px;margin:30px 0;}
        .mini-faq h4{font-size:1.6rem;margin-bottom:15px;}

        /* 固定下载按钮 */
        .fixed-download{position:fixed;bottom:30px;right:30px;z-index:999;background:#1e5fd9;color:white;width:64px;height:64px;border-radius:40px;display:flex;align-items:center;justify-content:center;box-shadow:0 12px 28px rgba(30,95,217,0.4);text-decoration:none;font-size:28px;font-weight:700;transition:0.2s;}
        .fixed-download:hover{transform:scale(1.08);background:#0f4ab8;}

        .footer{margin-top:50px;padding:28px 0;border-top:1px solid rgba(0,0,0,0.05);color:#5c6f8c;display:flex;justify-content:space-between;font-size:0.9rem;flex-wrap:wrap;}

        @media (max-width:720px){
            .nav-bar{flex-direction:column;gap:15px;}
            .step-container{grid-template-columns:1fr;}
            .error-grid{grid-template-columns:1fr;}
            .page-header h1{font-size:2rem;}
        }