:root {
    --primary: #0066cc; /* 高可信企业蓝 */
    --primary-hover: #0052a3;
    --success: #28a745; /* 安全绿 */
    --warning: #ff9900;
    --bg-light: #f4f7f6;
    --bg-white: #ffffff;
    --text-dark: #222222;
    --text-main: #444444;
    --text-muted: #888888;
    --border: #e0e0e0;
    --shadow-soft: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-card: 0 4px 12px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    background-color: var(--bg-light); color: var(--text-main); 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: 4px; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }

/* 顶部可信认证条 */
.trust-bar { background: #e8f4f8; border-bottom: 1px solid #d1e5ec; padding: 8px 0; font-size: 12px; color: #005b82; text-align: center; }
.trust-bar span { font-weight: bold; margin: 0 15px; display: inline-flex; align-items: center; gap: 5px; }

/* 导航栏 */
header { background: var(--bg-white); border-bottom: 2px solid var(--primary); position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow-soft); }
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 75px; }
.logo-area { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 24px; font-weight: 800; color: var(--text-dark); letter-spacing: -0.5px; }
.logo span { color: var(--primary); }
.auth-badge { background: var(--success); color: #fff; padding: 2px 6px; border-radius: 3px; font-size: 12px; font-weight: bold; }
.nav-links { display: flex; gap: 25px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-dark); padding: 5px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); border-bottom: 2px solid var(--primary); }

/* 按钮规范 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 28px; border-radius: 3px; font-weight: 700; font-size: 16px;
    cursor: pointer; border: 1px solid transparent; transition: 0.2s;
}
.btn-primary { background: var(--warning); color: #fff; border-color: #e68a00; box-shadow: 0 2px 5px rgba(255,153,0,0.3); }
.btn-primary:hover { background: #e68a00; transform: translateY(-1px); box-shadow: 0 4px 8px rgba(255,153,0,0.4); }
.btn-secondary { background: var(--primary); color: #fff; border-color: var(--primary-hover); }
.btn-secondary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-outline { background: var(--bg-white); color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: #f0f7ff; }

/* Hero区 */
.hero { background: var(--bg-white); padding: 60px 0 80px; border-bottom: 1px solid var(--border); }
.hero-inner { display: flex; align-items: center; gap: 40px; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 42px; font-weight: 800; color: var(--text-dark); margin-bottom: 15px; line-height: 1.2; }
.hero-text p { font-size: 18px; color: var(--text-main); margin-bottom: 30px; }
.security-tags { display: flex; gap: 15px; margin-bottom: 30px; }
.s-tag { display: flex; align-items: center; gap: 5px; font-size: 13px; color: var(--success); font-weight: bold; background: #eaf8ed; padding: 4px 10px; border-radius: 4px; border: 1px solid #c3e6cb; }
.hero-btns { display: flex; gap: 15px; }
.hero-img { flex: 1; text-align: center; }
.browser-frame { border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow-card); overflow: hidden; background: var(--bg-white); }
.browser-header { background: #f1f1f1; height: 30px; display: flex; align-items: center; padding: 0 10px; border-bottom: 1px solid var(--border); }
.dots { display: flex; gap: 5px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: #ccc; }

/* 模块通用 */
section { padding: 70px 0; }
.sec-title { text-align: center; font-size: 32px; font-weight: 700; color: var(--text-dark); margin-bottom: 40px; }
.sec-title::after { content: ''; display: block; width: 40px; height: 3px; background: var(--primary); margin: 15px auto 0; }

/* 核心卖点 */
.feature-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-card { background: var(--bg-white); border: 1px solid var(--border); padding: 25px 15px; text-align: center; border-radius: 6px; transition: 0.2s; }
.f-card:hover { border-color: var(--primary); box-shadow: var(--shadow-soft); transform: translateY(-2px); }
.f-card img { width: 48px; height: 48px; margin: 0 auto 15px; }
.f-card h3 { font-size: 16px; font-weight: 700; color: var(--text-dark); margin-bottom: 8px; }
.f-card p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 (类似软件评测) */
.detail-item { display: flex; gap: 40px; margin-bottom: 50px; background: var(--bg-white); border: 1px solid var(--border); padding: 30px; border-radius: 8px; box-shadow: var(--shadow-soft); }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; display: flex; flex-direction: column; justify-content: center; }
.d-text h3 { font-size: 24px; font-weight: 700; color: var(--text-dark); margin-bottom: 15px; }
.d-text p { font-size: 15px; color: var(--text-main); margin-bottom: 20px; line-height: 1.7; }
.auth-proof { display: inline-block; border-left: 3px solid var(--primary); padding-left: 10px; font-size: 13px; color: var(--text-muted); background: #f8f9fa; padding: 8px 10px; border-radius: 0 4px 4px 0; }
.d-img { flex: 1; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }

/* 对比表格 (专业评测风) */
.compare-box { background: var(--bg-white); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-soft); }
.compare-table { width: 100%; border-collapse: collapse; text-align: center; font-size: 14px; }
.compare-table th, .compare-table td { padding: 15px; border-bottom: 1px solid var(--border); }
.compare-table th { background: #f8f9fa; color: var(--text-dark); font-weight: 600; border-bottom: 2px solid var(--border); }
.compare-table .hl { color: var(--primary); font-weight: 700; background: #f0f7ff; }

/* 版本下载区 */
.v-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.v-card { background: var(--bg-white); border: 1px solid var(--border); padding: 30px; border-radius: 6px; text-align: center; position: relative; }
.v-card:hover { border-color: var(--primary); box-shadow: var(--shadow-card); }
.v-card.rec { border: 2px solid var(--warning); }
.v-card.rec::before { content: '官方推荐安装'; position: absolute; top: -1px; left: -1px; background: var(--warning); color: #fff; font-size: 12px; font-weight: bold; padding: 4px 10px; border-radius: 4px 0 4px 0; }
.v-card h3 { font-size: 22px; font-weight: 700; color: var(--text-dark); margin-bottom: 10px; }
.v-card p { font-size: 13px; color: var(--text-muted); margin-bottom: 25px; height: 40px; }

/* 数据背书 */
.data-sec { background: var(--primary); color: #fff; padding: 50px 0; margin-top: 20px; }
.data-flex { display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 42px; font-weight: 700; margin-bottom: 5px; }
.data-item p { font-size: 15px; opacity: 0.9; }

/* FAQ */
.faq-wrap { display: grid; grid-template-columns: 1fr; gap: 15px; max-width: 900px; margin: 0 auto; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border); padding: 20px; border-radius: 4px; display: flex; gap: 15px; align-items: flex-start; }
.faq-icon { color: var(--primary); font-weight: bold; font-size: 18px; }
.faq-content h4 { font-size: 15px; font-weight: 700; color: var(--text-dark); margin-bottom: 8px; }
.faq-content p { font-size: 14px; color: var(--text-main); }

footer { background: #eceff1; padding: 30px 0; text-align: center; color: var(--text-muted); font-size: 13px; border-top: 1px solid var(--border); }
.footer-trust { display: flex; justify-content: center; gap: 15px; margin-bottom: 15px; }
.footer-trust img { height: 24px; filter: grayscale(100%); opacity: 0.6; }