:root {
    --bg-dark: #070B14;
    --bg-card: #111827;
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --ai-grad: linear-gradient(135deg, #8B5CF6 0%, #3B82F6 100%);
    --ai-glow: 0 0 20px rgba(139, 92, 246, 0.4);
    --border-color: #1F2937;
    --border-radius: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", -apple-system, sans-serif; color: var(--text-main); background-color: var(--bg-dark); line-height: 1.7; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; border-radius: 8px; }

/* 导航 */
.header { background: rgba(11, 15, 25, 0.8); 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; height: 70px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: bold; display: flex; align-items: center; gap: 10px; background: var(--ai-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo img { width: 32px; height: 32px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--text-main); font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: #8B5CF6; }

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

/* 按钮 */
.btn { display: inline-block; padding: 14px 36px; border-radius: 30px; font-size: 16px; font-weight: bold; cursor: pointer; text-align: center; }
.btn-primary { background: var(--ai-grad); color: #fff; box-shadow: var(--ai-glow); border: none; }
.btn-primary:hover { transform: scale(1.05); box-shadow: 0 0 30px rgba(139, 92, 246, 0.6); }
.btn-outline { background: transparent; color: #F3F4F6; border: 2px solid #3B82F6; box-shadow: 0 0 10px rgba(59, 130, 246, 0.2); }
.btn-outline:hover { background: rgba(59, 130, 246, 0.1); }

/* 首屏 AI风 */
.hero { text-align: center; padding: 100px 20px; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 800px; height: 800px; background: radial-gradient(circle, rgba(139,92,246,0.15) 0%, rgba(7,11,20,0) 70%); z-index: -1; pointer-events: none; }
.hero h1 { font-size: 56px; margin-bottom: 20px; letter-spacing: 2px; }
.hero h1 span { background: var(--ai-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.subtitle { font-size: 22px; color: var(--text-muted); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 50px; }
.hero-img { max-width: 900px; margin: 0 auto; position: relative; border-radius: 12px; padding: 2px; background: var(--ai-grad); box-shadow: var(--ai-glow); }
.hero-img img { display: block; border-radius: 10px; }

/* 模块标题 */
.sec-title { text-align: center; font-size: 36px; margin-bottom: 60px; font-weight: bold; }
.sec-title span { color: #8B5CF6; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.feat-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 30px 15px; text-align: center; transition: 0.3s; position: relative; overflow: hidden; }
.feat-card::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background: var(--ai-grad); transform: scaleX(0); transition: 0.3s; }
.feat-card:hover { transform: translateY(-5px); box-shadow: var(--ai-glow); border-color: #3B82F6; }
.feat-card:hover::after { transform: scaleX(1); }
.feat-card img { width: 50px; height: 50px; margin-bottom: 20px; filter: drop-shadow(0 0 8px rgba(139,92,246,0.5)); }
.feat-card h3 { font-size: 18px; margin-bottom: 10px; }
.feat-card p { font-size: 13px; color: var(--text-muted); }

/* 功能详情 - AI特色 */
.ai-module { display: flex; align-items: center; gap: 50px; background: var(--bg-card); padding: 40px; border-radius: var(--border-radius); border: 1px solid var(--border-color); margin-bottom: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.ai-module:nth-child(even) { flex-direction: row-reverse; }
.ai-content { flex: 1; }
.ai-badge { display: inline-block; padding: 5px 12px; background: rgba(139, 92, 246, 0.1); border: 1px solid #8B5CF6; color: #D8B4FE; border-radius: 20px; font-size: 12px; margin-bottom: 15px; font-weight: bold; letter-spacing: 1px; }
.ai-content h3 { font-size: 28px; margin-bottom: 20px; color: #fff; }
.ai-content p { font-size: 16px; color: var(--text-muted); margin-bottom: 25px; line-height: 1.8; }
.ai-data { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; color: #60A5FA; font-weight: bold; }
.ai-visual { flex: 1; position: relative; }
.ai-visual img { width: 100%; border-radius: 12px; border: 1px solid #374151; }
.ai-visual::before { content: ''; position: absolute; inset: -10px; background: var(--ai-grad); opacity: 0.1; filter: blur(20px); border-radius: 20px; z-index: -1; }

/* 浏览器对比 */
.compare-box { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 30px; overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 18px 20px; border-bottom: 1px solid var(--border-color); }
.compare-table th { font-size: 16px; color: var(--text-muted); }
.compare-table td { font-size: 15px; }
.highlight { background: rgba(139, 92, 246, 0.05); color: #A78BFA; font-weight: bold; border-left: 2px solid #8B5CF6; border-right: 2px solid #8B5CF6; }

/* 下载版本区 */
.version-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 40px 30px; text-align: center; transition: 0.3s; }
.v-card.ai-rec { background: linear-gradient(180deg, rgba(139, 92, 246, 0.1) 0%, var(--bg-card) 100%); border-color: #8B5CF6; box-shadow: var(--ai-glow); }
.v-card h3 { font-size: 24px; margin-bottom: 15px; color: #fff; }
.v-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 45px; }
.v-btn { display: block; padding: 12px; border-radius: 8px; border: 1px solid #374151; color: #fff; transition: 0.3s; font-weight: bold; }
.v-btn.rec-btn { background: var(--ai-grad); border: none; }
.v-btn:hover { background: #374151; }
.v-btn.rec-btn:hover { opacity: 0.9; background: var(--ai-grad); }

/* 数据背书 */
.data-band { display: flex; justify-content: space-around; padding: 60px 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); margin: 60px 0; }
.data-col { text-align: center; }
.data-col strong { font-size: 48px; background: var(--ai-grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; font-weight: bold; display: block; margin-bottom: 10px; }
.data-col span { font-size: 16px; color: var(--text-muted); }

/* FAQ */
.faq-box { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border-color); padding: 25px; border-radius: 12px; }
.faq-item h4 { font-size: 18px; color: #D8B4FE; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.faq-item h4::before { content: 'Q'; background: var(--ai-grad); padding: 2px 8px; border-radius: 4px; color: #fff; font-size: 14px; }
.faq-item p { font-size: 15px; color: var(--text-muted); line-height: 1.6; }

/* 页脚 */
.footer { text-align: center; padding: 40px; color: var(--text-muted); font-size: 14px; border-top: 1px solid var(--border-color); margin-top: 50px; background: rgba(0,0,0,0.3); }