:root {
    --primary: #ff5000; /* 高转化橙红 */
    --primary-hover: #e64800;
    --bg-main: #f4f5f6; /* 信息流灰底 */
    --bg-card: #ffffff;
    --text-main: #333333;
    --text-muted: #999999;
    --text-black: #111111;
    --border: #eeeeee;
    --radius: 8px;
}

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

.container { max-width: 800px; margin: 0 auto; padding: 0 16px; }

/* 导航栏 */
header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.logo { font-size: 20px; font-weight: 800; color: var(--text-black); }
.nav-links { display: flex; gap: 20px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-main); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 24px; border-radius: 4px; font-weight: 700; font-size: 18px;
    cursor: pointer; transition: 0.2s; text-align: center; border: none;
}
.btn-primary { background: var(--primary); color: #fff; width: 100%; box-shadow: 0 4px 10px rgba(255, 80, 0, 0.3); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); width: 100%; }

/* 信息流卡片通用 */
.feed-card {
    background: var(--bg-card); border-radius: var(--radius);
    padding: 20px; margin: 16px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.card-title { font-size: 22px; font-weight: 800; color: var(--text-black); margin-bottom: 12px; line-height: 1.4; }
.card-desc { font-size: 16px; color: var(--text-main); margin-bottom: 16px; }

/* Hero 卡片 */
.hero-card { margin-top: 24px; }
.hero-title { font-size: 28px; font-weight: 900; color: var(--text-black); margin-bottom: 8px; }
.hero-subtitle { font-size: 18px; color: #ff5000; font-weight: bold; margin-bottom: 16px; background: rgba(255,80,0,0.1); display: inline-block; padding: 4px 12px; border-radius: 20px; }
.hero-img { width: 100%; border-radius: 8px; margin-bottom: 20px; }
.btn-group { display: flex; gap: 12px; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 16px; }
.f-item { text-align: center; }
.f-item img { width: 40px; height: 40px; margin: 0 auto 8px; border-radius: 0; }
.f-item p { font-size: 12px; font-weight: 600; color: var(--text-main); line-height: 1.2; }

/* 详情卡片 (单图+文字) */
.detail-card .img-wrap { margin-bottom: 16px; }
.detail-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; }
.detail-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 16px; }
.detail-card .tag { display: inline-block; background: #f0f0f0; color: #666; font-size: 12px; padding: 2px 8px; border-radius: 4px; margin-bottom: 12px; }

/* 对比卡片 */
.compare-table { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 14px; }
.compare-table th, .compare-table td { padding: 12px 8px; text-align: center; border-bottom: 1px solid var(--border); }
.compare-table th { background: #fafafa; color: var(--text-muted); font-weight: normal; }
.compare-table .highlight { color: var(--primary); font-weight: 700; background: #fff8f5; }

/* 下载版本卡片 */
.ver-card { border: 1px solid var(--border); border-radius: 8px; padding: 20px; margin-bottom: 16px; position: relative; }
.ver-card h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; }
.ver-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; }
.hot-tag { position: absolute; top: 0; right: 0; background: #ff0000; color: #fff; font-size: 12px; padding: 2px 8px; border-radius: 0 8px 0 8px; font-weight: bold; }

/* 数据背书 */
.data-flex { display: flex; justify-content: space-around; text-align: center; margin-top: 16px; }
.data-item h4 { font-size: 28px; font-weight: 900; color: var(--primary); margin-bottom: 4px; }
.data-item p { font-size: 13px; color: var(--text-muted); }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-item h4 { font-size: 16px; font-weight: 700; color: var(--text-black); margin-bottom: 8px; }
.faq-item p { font-size: 14px; color: var(--text-muted); }

footer { text-align: center; padding: 24px 0 40px; color: var(--text-muted); font-size: 12px; }