:root {
    --bg-main: #F4F7FB;
    --bg-white: #FFFFFF;
    --primary: #4A60F5; /* AI 科技蓝 */
    --primary-light: #EEF1FF;
    --ai-purple: #8B5CF6;
    --ai-gradient: linear-gradient(135deg, #4A60F5 0%, #8B5CF6 100%);
    --text-dark: #1E293B;
    --text-body: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --shadow-soft: 0 10px 30px rgba(74, 96, 245, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg-main); color: var(--text-body); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; display: block; }

/* 导航 */
.header { background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--border); }
.nav-wrap { max-width: 1300px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 76px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: 800; color: var(--text-dark); display: flex; align-items: center; gap: 12px; }
.logo img { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 36px; }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--text-dark); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.3s; }
.btn-primary { background: var(--ai-gradient); color: #FFF; box-shadow: 0 8px 20px rgba(139, 92, 246, 0.3); border: none; }
.btn-primary:hover { box-shadow: 0 12px 25px rgba(139, 92, 246, 0.4); transform: translateY(-2px); }
.btn-outline { background: var(--bg-white); color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }

/* Hero 区 - AI 办公场景 */
.hero { padding: 80px 20px 0; text-align: center; background: radial-gradient(circle at top, #FFF 0%, var(--bg-main) 80%); overflow: hidden; position: relative; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; background: var(--primary-light); color: var(--primary); padding: 6px 16px; border-radius: 20px; font-size: 14px; font-weight: 700; margin-bottom: 24px; }
.hero-tag i { width: 8px; height: 8px; border-radius: 50%; background: var(--ai-purple); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(139,92,246,0.6); } 70% { box-shadow: 0 0 0 10px rgba(139,92,246,0); } 100% { box-shadow: 0 0 0 0 rgba(139,92,246,0); } }
.hero h1 { font-size: 56px; font-weight: 900; color: var(--text-dark); margin-bottom: 20px; letter-spacing: -1px; }
.hero h1 span { background: var(--ai-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero .subtitle { font-size: 22px; color: var(--text-body); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 24px; margin-bottom: 60px; position: relative; z-index: 10; }
.hero-visual { max-width: 1100px; margin: 0 auto; position: relative; border-radius: 16px 16px 0 0; box-shadow: 0 -20px 60px rgba(0,0,0,0.1); border: 1px solid rgba(255,255,255,0.5); overflow: hidden; }
/* AI 浮窗模拟 */
.hero-visual::before { content: "✨ 智能总结：本页核心信息..."; position: absolute; top: 30px; right: -30px; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); padding: 15px 25px; border-radius: 12px; font-size: 14px; font-weight: 600; color: var(--ai-purple); box-shadow: 0 10px 30px rgba(0,0,0,0.1); border: 1px solid var(--primary-light); z-index: 5; transform: translateY(0); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 100px 20px; }
.sec-title { text-align: center; font-size: 38px; font-weight: 800; color: var(--text-dark); margin-bottom: 60px; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--bg-white); padding: 35px 20px; border-radius: 16px; text-align: center; box-shadow: var(--shadow-soft); transition: 0.3s; position: relative; overflow: hidden; border: 1px solid var(--border); }
.f-box:hover { transform: translateY(-5px); border-color: var(--primary); }
.f-box img { width: 64px; height: 64px; margin: 0 auto 20px; }
.f-box h3 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; }
.f-box p { font-size: 14px; color: var(--text-muted); }

/* 功能详情 - 左右排版融入AI对话框 */
.detail-sec { display: flex; align-items: center; gap: 80px; margin-bottom: 120px; }
.detail-sec:nth-child(even) { flex-direction: row-reverse; }
.d-content { flex: 1; }
.d-tag { display: inline-block; background: var(--primary-light); color: var(--primary); padding: 6px 14px; border-radius: 8px; font-size: 13px; font-weight: 600; margin-bottom: 15px; }
.d-content h3 { font-size: 32px; font-weight: 800; color: var(--text-dark); margin-bottom: 20px; }
.d-content p { font-size: 17px; line-height: 1.8; color: var(--text-body); margin-bottom: 30px; }
.d-stats { display: flex; gap: 40px; }
.stat { border-left: 3px solid var(--ai-purple); padding-left: 15px; }
.stat h4 { font-size: 24px; font-weight: 800; color: var(--text-dark); }
.stat p { font-size: 13px; color: var(--text-muted); }
.d-visual { flex: 1; position: relative; }
.d-visual img { border-radius: 16px; box-shadow: var(--shadow-soft); border: 1px solid var(--border); }

/* 浏览器对比 */
.compare-wrap { background: var(--bg-white); border-radius: 20px; box-shadow: var(--shadow-soft); overflow: hidden; border: 1px solid var(--border); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 25px 30px; border-bottom: 1px solid var(--border); }
.compare-table th { background: #FAFAFA; font-weight: 700; color: var(--text-dark); font-size: 16px; }
.compare-table td { font-size: 15px; }
.compare-table .hl { background: var(--primary-light); color: var(--primary); font-weight: 700; position: relative; }
.compare-table .hl::after { content: "领先"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); background: var(--primary); color: #FFF; font-size: 12px; padding: 2px 8px; border-radius: 10px; }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 */
.data-panel { background: var(--text-dark); padding: 80px 0; border-radius: 20px; margin: 40px 0; background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCI+PGNpcmNsZSBjeD0iMiIgY3k9IjIiIHI9IjIiIGZpbGw9IiNmZmZmZmYiIGZpbGwtb3BhY2l0eT0iMC4wNSIvPjwvc3ZnPg=='); }
.data-inner { display: flex; justify-content: space-around; text-align: center; }
.data-item h4 { font-size: 54px; font-weight: 900; color: #FFF; margin-bottom: 10px; }
.data-item p { font-size: 16px; color: var(--text-muted); }

/* 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: 20px; text-align: center; border: 1px solid var(--border); transition: 0.3s; position: relative; }
.dl-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-soft); border-color: var(--primary); }
.dl-card.pro { border: 2px solid var(--ai-purple); }
.dl-card.pro::before { content: "AI 办公首选"; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--ai-gradient); color: #FFF; padding: 6px 16px; border-radius: 20px; font-size: 12px; font-weight: 800; }
.dl-card h3 { font-size: 24px; font-weight: 800; color: var(--text-dark); margin-bottom: 16px; }
.dl-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 40px; height: 48px; }
.dl-card .btn { width: 100%; }

/* FAQ */
.faq-box { background: var(--bg-white); border-radius: 16px; padding: 40px; border: 1px solid var(--border); margin-bottom: 20px; }
.faq-box h4 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: "Q"; color: var(--ai-purple); font-size: 24px; font-weight: 900; }
.faq-box p { font-size: 15px; color: var(--text-body); padding-left: 28px; line-height: 1.8; }

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