:root {
    --pc-blue: #0055FF;
    --pc-blue-hover: #0044CC;
    --pc-dark: #0B1120;
    --pc-gray: #1E293B;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --text-main: #334155;
    --text-light: #94A3B8;
    --border-color: #E2E8F0;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-heavy: 0 20px 40px rgba(0, 85, 255, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", -apple-system, sans-serif; color: var(--text-main); background: var(--bg-light); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; border-radius: 4px; }
ul { list-style: none; }

/* 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-soft); }
.nav-wrap { 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: bold; color: var(--pc-dark); display: flex; align-items: center; gap: 10px; }
.logo img { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 16px; color: var(--text-main); font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--pc-blue); }

.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 6px; font-size: 18px; font-weight: bold; cursor: pointer; transition: 0.3s; }
.btn-primary { background: linear-gradient(180deg, #1A6DFF 0%, var(--pc-blue) 100%); color: #fff; box-shadow: 0 4px 10px rgba(0,85,255,0.3); border: 1px solid #0044CC; text-shadow: 0 1px 2px rgba(0,0,0,0.2); }
.btn-primary:hover { background: linear-gradient(180deg, var(--pc-blue) 0%, #0044CC 100%); transform: translateY(-2px); box-shadow: 0 6px 15px rgba(0,85,255,0.4); }
.btn-outline { background: var(--bg-white); color: var(--pc-blue); border: 2px solid var(--pc-blue); box-shadow: var(--shadow-soft); }
.btn-outline:hover { background: #EFF6FF; }

/* 首屏 (PC主机+显示器概念) */
.hero { background: var(--pc-dark); color: #fff; padding: 100px 20px 80px; position: relative; overflow: hidden; }
.hero::after { content: ''; position: absolute; top: 0; right: 0; width: 50%; height: 100%; background: radial-gradient(circle at center, rgba(0,85,255,0.2) 0%, transparent 70%); pointer-events: none; }
.hero-wrap { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-content { flex: 1; }
.hero-content h1 { font-size: 52px; font-weight: 900; margin-bottom: 20px; line-height: 1.2; letter-spacing: 1px; }
.hero-content .subtitle { font-size: 24px; color: #60A5FA; margin-bottom: 30px; font-weight: bold; }
.hero-content .desc { font-size: 16px; color: var(--text-light); margin-bottom: 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1.2; position: relative; }
.hero-visual img { border-radius: 12px; box-shadow: var(--shadow-heavy); border: 4px solid #1E293B; background: #000; }

/* 模块标题 */
.sec-title { text-align: center; font-size: 36px; font-weight: bold; color: var(--pc-dark); margin-bottom: 60px; position: relative; padding-bottom: 15px; }
.sec-title::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 80px; height: 4px; background: var(--pc-blue); border-radius: 2px; }

/* 核心卖点 (安装包/硬件特性风格) */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--bg-white); border: 1px solid var(--border-color); padding: 30px 15px; text-align: center; border-radius: 8px; box-shadow: var(--shadow-soft); transition: 0.3s; border-top: 4px solid var(--bg-white); }
.f-box:hover { transform: translateY(-5px); border-top-color: var(--pc-blue); box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
.f-box img { width: 50px; height: 50px; margin-bottom: 15px; }
.f-box h3 { font-size: 17px; color: var(--pc-dark); margin-bottom: 10px; font-weight: bold; }
.f-box p { font-size: 13px; color: #64748B; }

/* 功能详情 */
.detail-block { display: flex; align-items: center; gap: 60px; margin-bottom: 60px; background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 12px; padding: 50px; box-shadow: var(--shadow-soft); }
.detail-block:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; color: var(--pc-dark); font-weight: bold; margin-bottom: 20px; }
.d-text p { font-size: 16px; color: #475569; margin-bottom: 25px; line-height: 1.8; }
.d-data { display: inline-block; padding: 8px 16px; background: #EFF6FF; color: var(--pc-blue); font-weight: bold; border-radius: 4px; border: 1px solid #BFDBFE; font-size: 15px; }
.d-visual { flex: 1.2; }
.d-visual img { border-radius: 8px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); border: 1px solid var(--border-color); }

/* 浏览器对比 */
.compare-wrap { background: var(--bg-white); padding: 40px; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: var(--shadow-soft); }
.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: #F8FAFC; color: #64748B; font-weight: bold; font-size: 15px; }
.compare-table td { font-size: 16px; }
.compare-table .hl { background: #EFF6FF; color: var(--pc-blue); font-weight: bold; border-left: 2px solid #BFDBFE; border-right: 2px solid #BFDBFE; }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 (安装包视觉) */
.version-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 40px; }
.v-card { background: var(--bg-white); border: 2px solid var(--border-color); border-radius: 8px; padding: 40px 30px; text-align: center; transition: 0.3s; position: relative; }
.v-card:hover { border-color: var(--pc-blue); box-shadow: var(--shadow-soft); }
.v-card.main { border-color: var(--pc-blue); box-shadow: 0 10px 30px rgba(0,85,255,0.1); }
.v-card.main::before { content: '官方推荐'; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--pc-blue); color: #fff; padding: 4px 15px; border-radius: 20px; font-size: 13px; font-weight: bold; }
.v-card img.pkg-icon { width: 64px; height: 64px; margin: 0 auto 20px; }
.v-card h3 { font-size: 24px; color: var(--pc-dark); margin-bottom: 15px; font-weight: bold; }
.v-card p { font-size: 14px; color: #64748B; margin-bottom: 30px; height: 45px; }
.v-card .btn { width: 100%; font-size: 16px; padding: 12px; }

/* 数据背书 */
.data-sec { display: flex; justify-content: space-around; background: var(--pc-dark); color: #fff; padding: 60px; border-radius: 12px; margin: 80px 0; background-image: linear-gradient(45deg, #0B1120 0%, #1E293B 100%); box-shadow: var(--shadow-heavy); }
.data-item { text-align: center; }
.data-item h4 { font-size: 48px; font-weight: 900; color: #60A5FA; margin-bottom: 10px; }
.data-item p { font-size: 16px; letter-spacing: 1px; color: #CBD5E1; }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 15px; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 8px; padding: 25px 30px; transition: 0.3s; border-left: 4px solid var(--border-color); }
.faq-box:hover { border-left-color: var(--pc-blue); box-shadow: var(--shadow-soft); }
.faq-box h4 { font-size: 18px; font-weight: bold; color: var(--pc-dark); margin-bottom: 12px; }
.faq-box p { font-size: 15px; color: #475569; line-height: 1.6; }

/* Footer */
.footer { background: #0B1120; color: #64748B; text-align: center; padding: 40px; font-size: 14px; border-top: 1px solid #1E293B; }