:root {
    --bg-light: #F7F9FA;
    --white: #FFFFFF;
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --primary-green: #00C289; /* 轻盈绿 */
    --primary-hover: #00A373;
    --light-green: #E6F8F3;
    --border-color: #E5E7EB;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* 速度线背景 */
.speed-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; overflow: hidden; pointer-events: none;
}
.speed-bg::before {
    content: ''; position: absolute; width: 200%; height: 200%; top: -50%; left: -50%;
    background: repeating-linear-gradient(45deg, transparent, transparent 150px, rgba(0, 194, 137, 0.03) 150px, rgba(0, 194, 137, 0.03) 152px);
    animation: slideLines 20s linear infinite;
}
@keyframes slideLines {
    from { transform: translateX(0); }
    to { transform: translateX(-150px); }
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 */
.header {
    background-color: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 1000;
}
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; }
.logo { font-size: 22px; font-weight: 700; color: var(--text-dark); display: flex; align-items: center; gap: 10px; }
.logo-icon { width: 36px; height: 36px; border-radius: 8px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--text-gray); font-weight: 500; padding: 8px 12px; border-radius: 6px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-green); background-color: var(--light-green); }

/* 清爽按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 12px 32px;
    border-radius: 40px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.2s; border: none;
}
.btn-primary { background-color: var(--primary-green); color: #fff; box-shadow: 0 4px 12px rgba(0, 194, 137, 0.3); }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(0, 194, 137, 0.4); }
.btn-outline { background-color: var(--white); color: var(--primary-green); border: 1px solid var(--primary-green); }
.btn-outline:hover { background-color: var(--light-green); transform: translateY(-2px); }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; position: relative; }
.sec-title { text-align: center; font-size: 32px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.sec-subtitle { text-align: center; font-size: 16px; color: var(--text-gray); margin-bottom: 50px; }

/* 卡片风格 */
.clean-card { background: var(--white); border-radius: 16px; padding: 30px; border: 1px solid var(--border-color); transition: 0.3s; }
.clean-card:hover { border-color: var(--primary-green); box-shadow: 0 10px 25px rgba(0,0,0,0.04); transform: translateY(-5px); }

/* Hero区 */
.hero { text-align: center; padding: 80px 20px; background: linear-gradient(180deg, #FFFFFF 0%, #F7F9FA 100%); }
.hero h1 { font-size: 48px; font-weight: 800; color: var(--text-dark); margin-bottom: 20px; letter-spacing: -1px; }
.hero .subtitle { font-size: 20px; color: var(--text-gray); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.hero-visual { max-width: 900px; margin: 0 auto; border-radius: 20px; overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.06); border: 1px solid var(--border-color); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { text-align: center; }
.f-icon { width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 16px; background-color: var(--light-green); display: flex; align-items: center; justify-content: center; color: var(--primary-green); }
.f-box img { width: 32px; height: 32px; filter: brightness(0) saturate(100%) invert(48%) sepia(86%) saturate(2284%) hue-rotate(130deg) brightness(97%) contrast(101%); }
.f-box h3 { font-size: 16px; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
.f-box p { font-size: 13px; color: var(--text-gray); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 60px; margin-bottom: 60px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: 700; color: var(--text-dark); margin-bottom: 16px; }
.d-text p { font-size: 16px; color: var(--text-gray); margin-bottom: 24px; line-height: 1.8; }
.d-data { display: inline-block; padding: 8px 16px; background-color: var(--light-green); color: var(--primary-green); border-radius: 20px; font-weight: 600; font-size: 14px; }
.d-visual { flex: 1; padding: 15px; background: var(--white); border-radius: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.05); border: 1px solid var(--border-color); }

/* 浏览器对比 */
.compare-table { width: 100%; border-collapse: collapse; text-align: left; background: var(--white); border-radius: 16px; overflow: hidden; border: 1px solid var(--border-color); box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background-color: #FAFAFA; font-weight: 600; color: var(--text-gray); }
.compare-table td { font-weight: 500; color: var(--text-dark); }
.compare-table .hl { color: var(--primary-green); font-weight: 700; background-color: var(--light-green); }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 */
.data-sec { background-color: var(--primary-green); background-image: linear-gradient(135deg, var(--primary-green) 0%, #00DB9A 100%); padding: 60px 0; margin: 40px 0; color: var(--white); text-align: center; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; align-items: center; }
.data-item h4 { font-size: 42px; font-weight: 800; margin-bottom: 8px; }
.data-item p { font-size: 15px; font-weight: 500; opacity: 0.9; }
.data-icon { width: 70px; height: 70px; background: rgba(255,255,255,0.2); border-radius: 50%; padding: 15px; }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.dl-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; color: var(--text-dark); }
.dl-card p { font-size: 14px; color: var(--text-gray); margin-bottom: 24px; height: 42px; }
.dl-card .btn { width: 100%; }
.dl-card.pro { border-color: var(--primary-green); box-shadow: 0 10px 25px rgba(0, 194, 137, 0.1); }
.dl-card.pro h3 { color: var(--primary-green); }

/* FAQ */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-item { margin-bottom: 20px; padding: 24px; border-left: 4px solid var(--primary-green); }
.faq-item h4 { font-size: 16px; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
.faq-item p { font-size: 15px; color: var(--text-gray); line-height: 1.6; }

/* Footer */
.footer { background-color: var(--white); border-top: 1px solid var(--border-color); padding: 40px 20px; text-align: center; color: var(--text-gray); font-size: 14px; margin-top: 60px; }