:root {
    --ai-blue: #1A73E8;
    --ai-blue-hover: #1557B0;
    --bg-main: #FFFFFF;
    --bg-gray: #F8F9FA;
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --border-color: #DADCE0;
    --card-shadow: 0 4px 6px rgba(32, 33, 36, 0.1);
    --hover-shadow: 0 1px 3px rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: "Google Sans", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary); 
    background-color: var(--bg-main);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: 8px; }

/* 导航 */
.header { background: var(--bg-main); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 64px; padding: 0 20px; }
.logo { font-size: 20px; font-weight: 500; color: var(--text-primary); display: flex; align-items: center; gap: 8px; }
.logo img { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-secondary); padding: 8px 12px; border-radius: 4px; }
.nav-links a:hover, .nav-links a.active { color: var(--ai-blue); background: #F1F3F4; }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 10px 24px; border-radius: 24px; font-weight: 500; font-size: 15px;
    cursor: pointer; transition: 0.2s; border: 1px solid transparent;
}
.btn-primary { background: var(--ai-blue); color: #fff; box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15); }
.btn-primary:hover { background: var(--ai-blue-hover); box-shadow: var(--hover-shadow); }
.btn-outline { background: var(--bg-main); color: var(--ai-blue); border-color: var(--border-color); }
.btn-outline:hover { background: #F8F9FA; border-color: var(--ai-blue); }

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }

/* AI 搜索首屏 */
.ai-hero { text-align: center; padding: 80px 0 40px; }
.ai-hero-logo { width: 80px; height: 80px; margin: 0 auto 20px; }
.ai-hero h1 { font-size: 40px; font-weight: 400; margin-bottom: 10px; color: var(--text-primary); }
.ai-hero .subtitle { font-size: 18px; color: var(--text-secondary); margin-bottom: 30px; }

/* 大搜索框 */
.search-container { max-width: 680px; margin: 0 auto 40px; position: relative; }
.search-box {
    display: flex; align-items: center; background: #fff;
    border: 1px solid var(--border-color); border-radius: 24px;
    padding: 12px 20px; box-shadow: var(--card-shadow);
    transition: 0.3s;
}
.search-box:hover { box-shadow: var(--hover-shadow); }
.search-box input {
    flex: 1; border: none; outline: none; font-size: 16px;
    color: var(--text-primary); margin-left: 10px;
}
.search-box input::placeholder { color: #9AA0A6; }
.search-icon { color: #9AA0A6; font-size: 20px; }
.ai-badge { background: linear-gradient(90deg, #4285F4, #9B72CB, #D96570); -webkit-background-clip: text; color: transparent; font-weight: bold; margin-left: 10px; display: flex; align-items: center; gap: 5px; }

.hero-btns { display: flex; justify-content: center; gap: 16px; margin-bottom: 40px; }
.hero-visual { max-width: 800px; margin: 0 auto; border-radius: 16px; overflow: hidden; box-shadow: var(--hover-shadow); }

/* 核心卖点 - 搜索建议词样式 */
.suggestions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.sug-pill { background: #F1F3F4; border: 1px solid var(--border-color); border-radius: 16px; padding: 8px 16px; font-size: 14px; color: var(--text-primary); display: flex; align-items: center; gap: 8px; transition: 0.2s; cursor: pointer; }
.sug-pill:hover { background: #E8EAED; box-shadow: 0 1px 2px rgba(0,0,0,0.1); }
.sug-pill img { width: 16px; height: 16px; }

/* 智能结果卡片 (功能详情) */
.result-card { background: #fff; border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; margin-bottom: 24px; box-shadow: var(--card-shadow); transition: 0.2s; }
.result-card:hover { box-shadow: var(--hover-shadow); }
.result-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.result-icon { width: 32px; height: 32px; background: #E8F0FE; border-radius: 8px; display: flex; justify-content: center; align-items: center; }
.result-icon img { width: 20px; height: 20px; }
.result-title { font-size: 18px; font-weight: 500; color: var(--ai-blue); }
.result-body { display: flex; gap: 24px; align-items: flex-start; }
.result-text { flex: 1; font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.result-text p { margin-bottom: 12px; }
.result-data { display: inline-block; background: #FCE8E6; color: #D93025; padding: 4px 8px; border-radius: 4px; font-size: 12px; font-weight: 500; }
.result-image { flex: 1; max-width: 300px; }
.result-image img { border: 1px solid var(--border-color); border-radius: 8px; }

/* 浏览器对比 */
.table-card { background: #fff; border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; box-shadow: var(--card-shadow); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 16px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background: #F8F9FA; font-weight: 500; color: var(--text-secondary); font-size: 14px; }
.compare-table td { font-size: 14px; color: var(--text-primary); }
.compare-table .hl { font-weight: 500; color: var(--ai-blue); background: #E8F0FE; }

/* 下载版本区 */
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 24px; }
.dl-card { background: #fff; border: 1px solid var(--border-color); padding: 32px 24px; border-radius: 12px; text-align: center; box-shadow: var(--card-shadow); display: flex; flex-direction: column; }
.dl-card h3 { font-size: 20px; font-weight: 500; margin-bottom: 12px; color: var(--text-primary); }
.dl-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; flex-grow: 1; }
.dl-card .btn { width: 100%; }
.dl-card.primary { border-color: var(--ai-blue); border-width: 2px; }

/* 数据背书 */
.data-panel { display: flex; justify-content: space-around; background: #F8F9FA; border-radius: 12px; padding: 40px; margin: 40px 0; border: 1px solid var(--border-color); }
.data-item { text-align: center; }
.data-item h4 { font-size: 36px; font-weight: 400; color: var(--ai-blue); margin-bottom: 8px; }
.data-item p { font-size: 14px; color: var(--text-secondary); }

/* FAQ */
.faq-grid { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
.faq-box { border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; background: #fff; cursor: pointer; transition: 0.2s; }
.faq-box:hover { background: #F8F9FA; }
.faq-q { font-size: 16px; font-weight: 500; color: var(--text-primary); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.faq-q::before { content: 'Q:'; color: var(--ai-blue); font-weight: bold; }
.faq-a { font-size: 14px; color: var(--text-secondary); padding-left: 24px; }

footer { text-align: center; padding: 24px 0; border-top: 1px solid var(--border-color); color: var(--text-secondary); font-size: 13px; background: #F8F9FA; }