/* 极简重置 · 统一风格 */
        *{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);}

        .page-header{margin:40px 0 20px;}
        .page-header h1{font-size:2.5rem;font-weight:700;letter-spacing:-0.02em;color:#0a1a2b;}
        .page-header .subhead{font-size:1.2rem;color:#406180;margin-top:12px;border-left:4px solid #1e5fd9;padding-left:20px;}

        /* FAQ 分类卡片 */
        .faq-category{background:#ffffff;border-radius:32px;padding:28px 30px;margin-bottom:32px;box-shadow:0 12px 24px -8px rgba(0,20,50,0.06);}
        .cat-title{display:flex;align-items:center;gap:14px;font-size:1.9rem;font-weight:700;margin-bottom:24px;border-bottom:2px solid #eef2f8;padding-bottom:16px;}
        .cat-icon{font-size:2.2rem;}
        .qa-list{display:flex;flex-direction:column;gap:18px;}
        .qa-item{border-bottom:1px solid #e9edf4;padding-bottom:18px;}
        .qa-question{font-weight:700;font-size:1.2rem;color:#0a2540;margin-bottom:8px;display:flex;align-items:baseline;gap:10px;}
        .qa-question::before{content:"Q:";color:#1e5fd9;font-weight:800;font-size:1.3rem;}
        .qa-answer{color:#2e4b6e;padding-left:32px;margin-bottom:4px;}
        .qa-answer::before{content:"A:";color:#1e5fd9;font-weight:700;margin-right:8px;}
        .qa-note{font-size:0.9rem;color:#5f7d9c;margin-top:6px;padding-left:32px;}

        /* 内链引导区域 */
        .link-guide{display:flex;gap:20px;margin:30px 0;flex-wrap:wrap;}
        .guide-card{background:#eef4fe;border-radius:28px;padding:22px 28px;flex:1;display:flex;align-items:center;justify-content:space-between;text-decoration:none;color:#1a2f4a;transition:0.15s;}
        .guide-card:hover{background:#dfeafc;}
        .guide-card span{font-size:1.4rem;font-weight:650;}
        .guide-arrow{font-size:2rem;color:#1e5fd9;}

        /* 下载号召条 */
        .download-cta{background:#1e5fd9;border-radius:60px;padding:28px 36px;margin:40px 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:20px;}
        .download-cta p{color:white;font-size:1.8rem;font-weight:650;}
        .cta-big-btn{background:white;color:#1e5fd9;padding:16px 40px;border-radius:60px;font-weight:700;font-size:1.3rem;text-decoration:none;box-shadow:0 8px 22px rgba(0,0,0,0.1);}

        .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;flex-wrap:wrap;}

        .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;}

        @media (max-width:720px){
            .nav-bar{flex-direction:column;gap:15px;}
            .page-header h1{font-size:2rem;}
            .download-cta p{font-size:1.5rem;}
        }