* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
    :root {
        --primary-color: #000;
        --bg-color: #ffffff;
        --text-color: #333;
        --secondary-text: #888;
        --accent-color: #007aff;
        --brand: #ffca18;
    }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        line-height: 1.6;
        color: var(--text-color);
        max-width: 600px;
        margin: 0 auto;
        padding: max(30px, env(safe-area-inset-top)) 20px max(30px, env(safe-area-inset-bottom));
        background-color: var(--bg-color);
        -webkit-font-smoothing: antialiased;
    }
    .top-nav { margin-bottom: 18px; font-size: 14px; }
    .top-nav a { color: var(--secondary-text); text-decoration: none; }
    .top-nav a:hover { color: #111; }
    .header-section { text-align: center; margin-bottom: 30px; }
    .title { font-size: 24px; font-weight: 600; margin: 0 0 5px; }
    .subtitle { font-size: 14px; color: var(--secondary-text); margin-bottom: 25px; }
    .btn-primary {
        display: flex; align-items: center; justify-content: center;
        background: var(--primary-color); color: #fff;
        padding: 14px 20px; border-radius: 25px; text-decoration: none;
        font-weight: 600; font-size: 16px; transition: transform .15s, opacity .2s;
        width: 100%; max-width: 300px; margin: 0 auto;
        box-shadow: 0 4px 14px rgba(0,0,0,.15);
    }
    .btn-primary:active { transform: scale(.96); }
    .tip { font-size: 13px; color: #999; margin-top: 12px; }
    h2 {
        font-size: 18px; margin: 35px 0 15px; display: flex; align-items: center; font-weight: 600;
    }
    h2::before {
        content: ""; display: inline-block; width: 4px; height: 18px;
        background: var(--brand); border-radius: 2px; margin-right: 8px;
    }
    p.desc { font-size: 14px; color: #555; margin-bottom: 16px; }
    .notice-box {
        background-color: #fff9f0; border: 1px solid #ffedd5;
        border-radius: 12px; padding: 16px; margin: 0 0 25px;
    }
    .notice-box p { font-size: 14px; color: #555; margin: 0 0 12px; line-height: 1.7; }
    .notice-box p strong { color: #c2410c; }
    .notice-box .highlight {
        color: #b45309; font-weight: bold; background-color: #ffedd5;
        padding: 2px 6px; border-radius: 4px; margin: 0 2px;
    }
    .notice-box .disclaimer {
        font-size: 12px; color: #9ca3af; margin: 0;
        border-top: 1px dashed #fdba74; padding-top: 10px;
    }
    .ipa-box {
        display: grid; grid-template-columns: repeat(5, 1fr);
        gap: 15px 10px; margin-top: 15px;
    }
    .ipa-item {
        display: flex; flex-direction: column; align-items: center;
        text-decoration: none; color: inherit;
    }
    .ipa-icon {
        width: 60px; height: 60px; border-radius: 14px;
        background-size: cover; background-position: center; background-color: #f5f5f7;
        border: 1px solid rgba(0,0,0,.05); margin-bottom: 8px;
        box-shadow: 0 2px 8px rgba(0,0,0,.04);
    }
    .ipa-item:active .ipa-icon { transform: scale(.92); }
    .ipa-item span { font-size: 13px; color: #444; text-align: center; font-weight: 500; }
    @media (max-width: 480px) {
        .ipa-box { gap: 8px 4px; margin-top: 10px; }
        .ipa-icon { width: 44px; height: 44px; border-radius: 10px; margin-bottom: 4px; }
        .ipa-item span { font-size: 10px; }
    }
    .notes-list {
        font-size: 14px; color: #666; padding-left: 20px; margin: 0; line-height: 1.8;
    }
    .notes-list li { margin-bottom: 6px; }
    .seo-block {
        margin-top: 28px; padding: 16px; background: #fafafa;
        border: 1px solid #f0f0f0; border-radius: 12px; font-size: 14px; color: #555;
    }
    .seo-block h3 { font-size: 15px; margin: 0 0 8px; color: #222; }
    footer {
        margin-top: 50px; padding-top: 20px; border-top: 1px solid #f0f0f0;
        font-size: 13px; color: #aaa; text-align: center;
    }
    a { color: var(--accent-color); text-decoration: none; }