:root {
    --bg-light: #F4F7FB;
    --bg-white: #FFFFFF;
    --primary-color: #00B14F; /* 360品牌绿 */
    --primary-hover: #009643;
    --accent-orange: #FF7A00; /* 下载强调色 */
    --accent-orange-hover: #E66E00;
    --text-main: #1D2129;
    --text-gray: #4E5969;
    --text-light: #86909C;
    --border-color: #E5E6EB;
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background-color: var(--bg-light); color: var(--text-main); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; border-radius: 8px; }
ul { list-style: none; }

/* 导航 */
.header { background: var(--bg-white); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.02); }
.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(--text-main); display: flex; align-items: center; gap: 10px; }
.logo img { width: 32px; height: 32px; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 16px; font-weight: 500; color: var(--text-gray); }
.nav-links a:hover, .nav-links a.active { color: var(--primary-color); }
.nav-dl-btn { background: var(--primary-color); color: #fff !important; padding: 6px 16px; border-radius: 20px; font-weight: bold; }
.nav-dl-btn:hover { background: var(--primary-hover); }

.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; }
.bg-white { background-color: var(--bg-white); }

/* 下载醒目按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 16px 40px; border-radius: 4px; font-size: 20px; font-weight: bold; cursor: pointer; transition: 0.3s; gap: 10px; }
.btn-primary { background: var(--accent-orange); color: #FFF; box-shadow: 0 8px 20px rgba(255, 122, 0, 0.3); position: relative; overflow: hidden; }
.btn-primary::after { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: rgba(255,255,255,0.2); transform: rotate(45deg) translateY(-100%); transition: 0.5s; }
.btn-primary:hover::after { transform: rotate(45deg) translateY(100%); }
.btn-primary:hover { background: var(--accent-orange-hover); transform: translateY(-2px); box-shadow: 0 12px 25px rgba(255, 122, 0, 0.4); }
.btn-outline { background: var(--bg-white); color: var(--text-main); border: 2px solid var(--border-color); font-size: 18px; }
.btn-outline:hover { border-color: var(--primary-color); color: var(--primary-color); }

/* 首屏 Hero 区 */
.hero { display: flex; align-items: center; gap: 60px; padding: 80px 20px; max-width: 1200px; margin: 0 auto; }
.hero-content { flex: 1.1; }
.hero-content h1 { font-size: 52px; font-weight: 900; color: var(--text-main); margin-bottom: 16px; line-height: 1.2; }
.hero-content .subtitle { font-size: 24px; color: var(--primary-color); font-weight: bold; margin-bottom: 24px; }
.hero-content .desc { font-size: 16px; color: var(--text-gray); margin-bottom: 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 20px; align-items: center; }
.hero-visual { flex: 1; }
.hero-visual img { border: 1px solid var(--border-color); box-shadow: var(--shadow-card); }

/* 安装步骤引导区 (下载引导风核心) */
.guide-section { background: var(--bg-white); padding: 60px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.sec-title { text-align: center; font-size: 32px; font-weight: bold; color: var(--text-main); margin-bottom: 50px; }
.steps-wrap { display: flex; justify-content: center; gap: 40px; max-width: 1000px; margin: 0 auto; position: relative; }
.steps-wrap::before { content: ''; position: absolute; top: 30px; left: 15%; right: 15%; height: 2px; background: dashed 2px var(--border-color); z-index: 1; }
.step-item { text-align: center; position: relative; z-index: 2; flex: 1; }
.step-num { width: 60px; height: 60px; background: var(--bg-white); border: 3px solid var(--primary-color); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 900; color: var(--primary-color); margin: 0 auto 20px; box-shadow: 0 4px 10px rgba(0, 177, 79, 0.2); }
.step-item h4 { font-size: 20px; font-weight: bold; margin-bottom: 10px; }
.step-item p { font-size: 14px; color: var(--text-gray); line-height: 1.6; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--bg-white); padding: 30px 20px; text-align: center; border-radius: 8px; box-shadow: var(--shadow-card); transition: 0.3s; }
.f-box:hover { transform: translateY(-5px); border-bottom: 4px solid var(--primary-color); }
.f-box img { width: 48px; height: 48px; margin: 0 auto 16px; }
.f-box h3 { font-size: 16px; font-weight: bold; margin-bottom: 8px; }
.f-box p { font-size: 13px; color: var(--text-light); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 60px; margin-bottom: 80px; }
.detail-box:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: bold; margin-bottom: 20px; }
.d-text p { font-size: 16px; color: var(--text-gray); margin-bottom: 24px; line-height: 1.8; }
.d-data { display: inline-block; padding: 10px 20px; background: rgba(0, 177, 79, 0.1); color: var(--primary-hover); font-weight: bold; border-radius: 4px; border-left: 4px solid var(--primary-color); }
.d-visual { flex: 1; }
.d-visual img { border: 1px solid var(--border-color); box-shadow: var(--shadow-card); }

/* 浏览器对比 */
.compare-box { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 8px; padding: 40px; box-shadow: var(--shadow-card); }
.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 { color: var(--text-light); font-weight: bold; background: var(--bg-light); }
.compare-table td { font-size: 15px; color: var(--text-main); }
.compare-table .hl { color: var(--primary-color); font-weight: bold; font-size: 16px; }
.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: 24px; }
.dl-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 40px 30px; text-align: center; border-radius: 8px; transition: 0.3s; }
.dl-card:hover { border-color: var(--primary-color); box-shadow: var(--shadow-card); }
.dl-card.rec { border: 2px solid var(--accent-orange); position: relative; }
.dl-card.rec::before { content: '主推版本'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--accent-orange); color: #FFF; padding: 4px 12px; border-radius: 12px; font-size: 12px; font-weight: bold; }
.dl-card h3 { font-size: 22px; font-weight: bold; margin-bottom: 16px; }
.dl-card p { font-size: 14px; color: var(--text-gray); margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; font-size: 16px; padding: 12px 0; }

/* 数据背书 */
.data-sec { display: flex; justify-content: space-around; padding: 60px 20px; background: var(--bg-white); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); margin: 60px 0; }
.data-item { text-align: center; }
.data-item h4 { font-size: 40px; font-weight: 900; color: var(--primary-color); margin-bottom: 8px; font-family: Tahoma, sans-serif; }
.data-item p { font-size: 15px; font-weight: 500; color: var(--text-main); }

/* FAQ */
.faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border-color); padding: 24px; border-radius: 8px; }
.faq-box h4 { font-size: 16px; font-weight: bold; margin-bottom: 12px; color: var(--text-main); display: flex; align-items: center; gap: 8px; }
.faq-box h4::before { content: '问'; display: inline-block; background: var(--primary-color); color: #fff; width: 22px; height: 22px; line-height: 22px; text-align: center; border-radius: 4px; font-size: 12px; }
.faq-box p { font-size: 14px; color: var(--text-gray); line-height: 1.6; padding-left: 30px; }

/* Footer */
.footer { background: #1D2129; text-align: center; padding: 40px; color: #86909C; font-size: 14px; margin-top: 60px; }