:root {
    --primary: #10B981; /* 清新浅绿 */
    --primary-light: #D1FAE5;
    --primary-hover: #059669;
    --bg-white: #FFFFFF;
    --bg-gray: #F9FAFB;
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --border-color: #E5E7EB;
    --shadow-soft: 0 10px 30px rgba(16, 185, 129, 0.05);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.03);
    --radius-round: 9999px;
    --radius-card: 20px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Helvetica Neue", sans-serif; color: var(--text-dark); background-color: var(--bg-white); line-height: 1.7; font-weight: 300; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: 0.3s ease; }
img { max-width: 100%; display: block; border-radius: 12px; }

/* 导航 */
.header { background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(229, 231, 235, 0.5); position: sticky; top: 0; z-index: 1000; }
.nav-wrap { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 76px; padding: 0 20px; }
.logo { font-size: 20px; font-weight: 600; display: flex; align-items: center; gap: 10px; color: var(--primary-hover); }
.logo img { width: 32px; height: 32px; border-radius: 50%; }
.nav-links { display: flex; gap: 35px; }
.nav-links a { font-size: 15px; color: var(--text-gray); font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.section { padding: 100px 0; }
.section-light { background: linear-gradient(180deg, #FFFFFF 0%, var(--primary-light) 200%); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0 36px; height: 52px; border-radius: var(--radius-round); font-size: 16px; font-weight: 500; cursor: pointer; transition: all 0.3s; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 16px rgba(16, 185, 129, 0.2); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 12px 20px rgba(16, 185, 129, 0.3); }
.btn-outline { background: var(--bg-white); color: var(--primary-hover); border: 1px solid var(--primary-light); box-shadow: var(--shadow-card); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-hover); border-color: var(--primary); }

/* 首屏区 */
.hero { text-align: center; padding: 120px 0 80px; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: 50%; transform: translateX(-50%); width: 1000px; height: 1000px; background: radial-gradient(circle, var(--primary-light) 0%, rgba(255,255,255,0) 60%); z-index: -1; }
.hero h1 { font-size: 52px; font-weight: 600; color: var(--text-dark); margin-bottom: 16px; letter-spacing: -1px; }
.hero .subtitle { font-size: 22px; color: var(--primary); margin-bottom: 30px; font-weight: 400; }
.hero .desc { font-size: 16px; color: var(--text-gray); max-width: 540px; margin: 0 auto 40px; line-height: 1.8; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-img { max-width: 900px; margin: 0 auto; position: relative; }
.hero-img img { box-shadow: var(--shadow-soft); border: 4px solid #fff; border-radius: var(--radius-card); }

/* 模块标题 */
.sec-title { text-align: center; font-size: 32px; font-weight: 600; color: var(--text-dark); margin-bottom: 60px; }

/* 核心卖点 */
.feature-icons { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--bg-white); border-radius: var(--radius-card); padding: 40px 20px; text-align: center; box-shadow: var(--shadow-card); transition: 0.3s; border: 1px solid rgba(243, 244, 246, 1); }
.f-box:hover { transform: translateY(-5px); border-color: var(--primary-light); box-shadow: var(--shadow-soft); }
.f-box img { width: 48px; height: 48px; margin: 0 auto 20px; filter: hue-rotate(140deg) saturate(1.5); }
.f-box h4 { font-size: 16px; font-weight: 500; margin-bottom: 8px; color: var(--text-dark); }
.f-box p { font-size: 13px; color: var(--text-gray); }

/* 功能详情 */
.detail-row { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-row:nth-child(even) { flex-direction: row-reverse; }
.d-content { flex: 1; padding: 20px; }
.d-badge { display: inline-block; padding: 6px 16px; background: var(--primary-light); color: var(--primary-hover); border-radius: 20px; font-size: 13px; font-weight: 500; margin-bottom: 16px; }
.d-content h3 { font-size: 28px; font-weight: 600; margin-bottom: 20px; color: var(--text-dark); }
.d-content p { font-size: 15px; color: var(--text-gray); margin-bottom: 24px; line-height: 1.8; }
.d-stat { font-size: 18px; font-weight: 500; color: var(--primary); }
.d-image { flex: 1.2; position: relative; }
.d-image img { border-radius: var(--radius-card); box-shadow: var(--shadow-soft); }

/* 浏览器对比 */
.compare-box { background: var(--bg-white); border-radius: var(--radius-card); box-shadow: var(--shadow-card); padding: 20px; overflow: hidden; border: 1px solid var(--border-color); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { font-weight: 500; color: var(--text-gray); font-size: 14px; background: #FAFAFA; }
.compare-table td { font-size: 15px; }
.compare-table .hl { color: var(--primary-hover); font-weight: 500; background: var(--primary-light); border-radius: 8px; }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card { background: var(--bg-white); padding: 50px 30px; border-radius: var(--radius-card); text-align: center; box-shadow: var(--shadow-card); transition: 0.3s; border: 1px solid transparent; }
.dl-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-soft); }
.dl-card.rec { border-color: var(--primary-light); background: linear-gradient(180deg, var(--bg-white) 0%, #F0FDF4 100%); }
.dl-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 16px; color: var(--text-dark); }
.dl-card p { font-size: 14px; color: var(--text-gray); margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { display: flex; justify-content: center; gap: 80px; padding: 60px 0; background: var(--primary-light); border-radius: var(--radius-card); margin: 60px 0; }
.data-item { text-align: center; }
.data-item h4 { font-size: 48px; font-weight: 600; color: var(--primary-hover); margin-bottom: 8px; }
.data-item p { font-size: 14px; color: var(--text-gray); font-weight: 500; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item { background: var(--bg-white); border-radius: 12px; padding: 24px; box-shadow: var(--shadow-card); border: 1px solid var(--border-color); }
.faq-item h4 { font-size: 16px; font-weight: 600; margin-bottom: 10px; color: var(--primary-hover); display: flex; align-items: center; gap: 8px; }
.faq-item h4::before { content: ''; display: block; width: 6px; height: 6px; border-radius: 50%; background: var(--primary); }
.faq-item p { font-size: 14px; color: var(--text-gray); padding-left: 14px; }

/* 页脚 */
.footer { text-align: center; padding: 40px; color: var(--text-gray); font-size: 13px; margin-top: 60px; }