:root {
    --ai-bg: #F0F4F8; /* 浅柔科技灰白 */
    --ai-card: #FFFFFF;
    --ai-blue: #2563EB; /* 智能蓝 */
    --ai-purple: #8B5CF6; /* 幻想紫 */
    --text-main: #1E293B;
    --text-muted: #64748B;
    --border-light: #E2E8F0;
    --shadow-soft: 0 10px 30px rgba(148, 163, 184, 0.15);
    --shadow-bubble: 0 4px 15px rgba(37, 99, 235, 0.1);
    --gradient-btn: linear-gradient(135deg, var(--ai-blue), var(--ai-purple));
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif; background-color: var(--ai-bg); 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: 12px; }
ul { list-style: none; }

/* 导航 */
.header { background: rgba(255, 255, 255, 0.95); box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(10px); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 76px; padding: 0 20px; }
.logo { font-size: 24px; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 10px; }
.logo img { width: 32px; height: 32px; }
.logo span { background: var(--gradient-btn); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 36px; }
.nav-links a { font-size: 16px; font-weight: 500; color: var(--text-muted); position: relative; padding-bottom: 5px; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 50%; width: 0; height: 2px; background: var(--ai-blue); transition: 0.3s; transform: translateX(-50%); }
.nav-links a:hover, .nav-links a.active { color: var(--ai-blue); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

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

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 36px; border-radius: 30px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.3s; }
.btn-primary { background: var(--gradient-btn); color: #FFF; box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3); border: none; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4); }
.btn-outline { background: #FFF; color: var(--ai-blue); border: 2px solid var(--ai-blue); }
.btn-outline:hover { background: var(--ai-blue); color: #FFF; }

/* 首屏 AI对话区 */
.hero { display: flex; align-items: center; gap: 60px; padding: 80px 20px 100px; max-width: 1200px; margin: 0 auto; }
.hero-content { flex: 1.1; }
.ai-tag { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; background: rgba(37, 99, 235, 0.1); color: var(--ai-blue); border-radius: 20px; font-size: 14px; font-weight: 600; margin-bottom: 24px; }
.ai-tag::before { content: '✨'; font-size: 16px; }
.hero-content h1 { font-size: 56px; font-weight: 900; line-height: 1.2; margin-bottom: 20px; color: var(--text-main); }
.hero-content h1 span { background: var(--gradient-btn); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-content .subtitle { font-size: 24px; color: var(--text-muted); margin-bottom: 30px; font-weight: 500; }
.hero-content .desc { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; line-height: 1.8; }
.hero-btns { display: flex; gap: 20px; }

/* 模拟AI对话窗口 */
.hero-visual { flex: 1; position: relative; }
.chat-window { background: var(--ai-card); border-radius: 24px; box-shadow: var(--shadow-soft); padding: 24px; border: 1px solid var(--border-light); }
.chat-bubble { max-width: 80%; padding: 16px 20px; border-radius: 20px; margin-bottom: 16px; font-size: 15px; line-height: 1.5; box-shadow: var(--shadow-bubble); }
.chat-user { background: #F8FAFC; color: var(--text-main); margin-left: auto; border-bottom-right-radius: 4px; border: 1px solid var(--border-light); }
.chat-ai { background: var(--gradient-btn); color: #FFF; margin-right: auto; border-bottom-left-radius: 4px; position: relative; }
.chat-ai::after { content: ''; position: absolute; bottom: -10px; left: 10px; width: 30px; height: 30px; background: url('assets/2.png') no-size; background-size: cover; border-radius: 50%; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
.search-bar { display: flex; align-items: center; background: #F1F5F9; border-radius: 30px; padding: 10px 20px; margin-top: 20px; }
.search-bar input { flex: 1; border: none; background: transparent; outline: none; font-size: 15px; color: var(--text-main); }
.search-bar span { width: 32px; height: 32px; background: var(--ai-blue); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #FFF; font-size: 12px; cursor: pointer; }

/* 模块标题 */
.sec-title { text-align: center; font-size: 36px; font-weight: 800; margin-bottom: 60px; color: var(--text-main); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { background: var(--ai-card); padding: 30px 20px; text-align: center; border-radius: 16px; box-shadow: var(--shadow-soft); transition: 0.3s; }
.f-box:hover { transform: translateY(-5px); box-shadow: 0 15px 35px rgba(37, 99, 235, 0.1); border-bottom: 3px solid var(--ai-blue); }
.f-box img { width: 50px; height: 50px; margin: 0 auto 16px; }
.f-box h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.f-box p { font-size: 14px; color: var(--text-muted); }

/* 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: 30px; font-weight: 800; margin-bottom: 20px; display: flex; align-items: center; gap: 12px; }
.d-text h3::before { content: ''; display: inline-block; width: 6px; height: 24px; background: var(--gradient-btn); border-radius: 3px; }
.d-text p { font-size: 16px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; background: rgba(139, 92, 246, 0.1); color: var(--ai-purple); border-radius: 12px; font-size: 18px; font-weight: 700; }
.d-visual { flex: 1.2; position: relative; }
.d-visual img { box-shadow: var(--shadow-soft); border: 1px solid var(--border-light); }
.d-bubble { position: absolute; background: #FFF; padding: 12px 20px; border-radius: 16px; box-shadow: var(--shadow-bubble); font-size: 14px; font-weight: 600; color: var(--ai-blue); animation: float 3s ease-in-out infinite; border: 1px solid var(--border-light); }
@keyframes float { 0% { transform: translateY(0px); } 50% { transform: translateY(-10px); } 100% { transform: translateY(0px); } }

/* 浏览器对比 */
.compare-box { background: var(--ai-card); border-radius: 20px; box-shadow: var(--shadow-soft); padding: 40px; overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border-light); }
.compare-table th { color: var(--text-muted); font-size: 15px; font-weight: 600; }
.compare-table td { font-size: 16px; font-weight: 500; }
.compare-table .hl { background: rgba(37, 99, 235, 0.05); color: var(--ai-blue); font-weight: 700; border-radius: 8px; }
.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: 30px; }
.dl-card { background: var(--ai-card); border: 1px solid var(--border-light); padding: 50px 30px; text-align: center; border-radius: 20px; transition: 0.3s; }
.dl-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-soft); }
.dl-card.rec { border: 2px solid var(--ai-blue); position: relative; box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15); }
.dl-card.rec::before { content: 'AI 推荐'; position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: var(--gradient-btn); color: #FFF; padding: 6px 16px; border-radius: 20px; font-size: 12px; font-weight: bold; }
.dl-card h3 { font-size: 24px; font-weight: 800; color: var(--text-main); margin-bottom: 15px; }
.dl-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; height: 42px; }
.dl-card .btn { width: 100%; }

/* 数据背书 */
.data-sec { background: var(--ai-card); padding: 60px 20px; margin: 80px 0; border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; }
.data-item { text-align: center; }
.data-item h4 { font-size: 48px; font-weight: 900; background: var(--gradient-btn); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 10px; }
.data-item p { font-size: 16px; font-weight: 500; color: var(--text-muted); }

/* FAQ */
.faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-box { background: var(--ai-card); border: 1px solid var(--border-light); padding: 24px; border-radius: 16px; transition: 0.3s; cursor: pointer; }
.faq-box:hover { border-color: var(--ai-purple); box-shadow: 0 5px 15px rgba(139, 92, 246, 0.08); }
.faq-box h4 { font-size: 16px; font-weight: 700; color: var(--text-main); margin-bottom: 10px; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: 'Q:'; color: var(--ai-blue); font-size: 18px; font-weight: 900; }
.faq-box p { font-size: 14px; color: var(--text-muted); line-height: 1.6; padding-left: 28px; }

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