:root {
    --safe-green: #00B262;
    --safe-green-hover: #009954;
    --safe-green-light: #E5F7ED;
    --text-main: #1F2937;
    --text-muted: #6B7280;
    --bg-white: #FFFFFF;
    --bg-gray: #F3F4F6;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main); 
    background-color: var(--bg-white);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 100;
    box-shadow: var(--shadow-sm);
}
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 72px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: 700; display: flex; align-items: center; gap: 10px; color: var(--text-main); }
.logo img { width: 32px; height: 32px; }
.logo-tag { font-size: 12px; background: var(--safe-green-light); color: var(--safe-green-hover); padding: 2px 8px; border-radius: 4px; border: 1px solid #A7E4C4; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 16px; font-weight: 500; color: var(--text-muted); }
.nav-links a:hover, .nav-links a.active { color: var(--safe-green); }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 32px; border-radius: 6px; font-weight: 600; font-size: 18px;
    cursor: pointer; transition: 0.2s; border: 1px solid transparent;
}
.btn-green { background: var(--safe-green); color: #fff; box-shadow: 0 4px 12px rgba(0, 178, 98, 0.25); }
.btn-green:hover { background: var(--safe-green-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 178, 98, 0.35); }
.btn-outline { background: var(--bg-white); color: var(--text-main); border-color: var(--border-color); box-shadow: var(--shadow-sm); }
.btn-outline:hover { background: var(--bg-gray); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-bg { background-color: var(--bg-gray); }
.sec-title { font-size: 32px; font-weight: 700; margin-bottom: 16px; text-align: center; color: var(--text-main); }
.sec-desc { font-size: 16px; color: var(--text-muted); text-align: center; margin-bottom: 48px; max-width: 600px; margin-inline: auto; }

/* 官方安全认证标签区 */
.trust-badges { display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.trust-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--safe-green-light); color: var(--safe-green-hover); padding: 6px 12px; border-radius: 4px; font-size: 13px; font-weight: 600; border: 1px solid #A7E4C4; }

/* Hero区 */
.hero { padding: 80px 0; border-bottom: 1px solid var(--border-color); background: linear-gradient(180deg, var(--safe-green-light) 0%, var(--bg-white) 100%); }
.hero-content { display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 48px; font-weight: 800; line-height: 1.2; margin-bottom: 16px; color: var(--text-main); }
.hero-text .subtitle { font-size: 22px; font-weight: 600; color: var(--safe-green); margin-bottom: 24px; }
.hero-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; }
.hero-visual { flex: 1; text-align: center; position: relative; }
.hero-visual img { box-shadow: var(--shadow-md); border: 1px solid var(--border-color); }
.download-safe-stamp { position: absolute; bottom: -20px; right: -20px; background: #fff; padding: 15px; border-radius: 50%; box-shadow: var(--shadow-md); width: 100px; height: 100px; display: flex; align-items: center; justify-content: center; text-align: center; font-weight: bold; color: var(--safe-green); border: 2px solid var(--safe-green-light); font-size: 14px; line-height: 1.2; transform: rotate(-15deg); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 32px 20px; text-align: center; border-radius: 8px; transition: 0.3s; }
.f-card:hover { border-color: var(--safe-green); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.f-card img { width: 48px; height: 48px; margin: 0 auto 16px; }
.f-card h3 { font-size: 16px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.f-card p { font-size: 13px; color: var(--text-muted); }

/* 详情区 */
.detail-modules { display: flex; flex-direction: column; gap: 80px; }
.detail-row { display: flex; align-items: center; gap: 64px; }
.detail-row:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
.d-text h3::before { content: ''; display: inline-block; width: 6px; height: 24px; background: var(--safe-green); border-radius: 3px; }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 24px; line-height: 1.8; }
.cert-box { background: var(--bg-gray); padding: 16px; border-radius: 6px; border-left: 4px solid var(--safe-green); display: flex; align-items: center; gap: 12px; }
.cert-box span { font-weight: 600; color: var(--safe-green-hover); font-size: 15px; }
.d-img { flex: 1; }
.d-img img { box-shadow: var(--shadow-md); border: 1px solid var(--border-color); }

/* 对比区 */
.compare-box { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background: var(--bg-gray); font-weight: 600; color: var(--text-muted); text-transform: uppercase; font-size: 14px; }
.compare-table .hl { background: var(--safe-green-light); color: var(--safe-green-hover); font-weight: 700; border-left: 2px solid var(--safe-green); border-right: 2px solid var(--safe-green); }

/* 下载区 */
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dl-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 40px 32px; border-radius: 8px; text-align: center; transition: 0.3s; }
.dl-card:hover { box-shadow: var(--shadow-md); }
.dl-card.rec { border: 2px solid var(--safe-green); box-shadow: 0 4px 12px rgba(0, 178, 98, 0.1); position: relative; }
.dl-card.rec::after { content: '官方推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--safe-green); color: #fff; font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 12px; }
.dl-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--text-main); }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 32px; height: 42px; }
.dl-card .btn { width: 100%; }

/* 数据展示 */
.data-sec { background: var(--text-main); padding: 60px 0; border-radius: 12px; color: #fff; text-align: center; }
.data-flex { display: flex; justify-content: space-around; }
.data-item h4 { font-size: 48px; font-weight: 800; color: var(--safe-green); margin-bottom: 8px; }
.data-item p { font-size: 16px; color: #D1D5DB; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border-color); padding: 24px; border-radius: 8px; display: flex; flex-direction: column; gap: 8px; }
.faq-box h4 { font-size: 16px; font-weight: 600; color: var(--text-main); display: flex; align-items: center; gap: 8px; }
.faq-box h4::before { content: '✓'; color: var(--safe-green); font-weight: bold; }
.faq-box p { font-size: 14px; color: var(--text-muted); line-height: 1.6; padding-left: 20px; }

footer { text-align: center; padding: 40px 0; border-top: 1px solid var(--border-color); color: var(--text-muted); font-size: 14px; background: var(--bg-white); }