/* 飞书官方网站 - 全局样式表 */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#1f2329;line-height:1.7;background:#fff}
a{text-decoration:none;color:#3370ff;transition:color .2s}
a:hover{color:#1b5ad9}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);border-bottom:1px solid #e5e6eb;backdrop-filter:blur(10px)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;font-size:22px;font-weight:700;color:#1f2329}
.logo img{height:32px;margin-right:10px}
.nav{display:flex;gap:8px}
.nav a{padding:8px 16px;color:#4e5969;font-size:15px;border-radius:6px;font-weight:500}
.nav a:hover{background:#f2f3f5;color:#1f2329}
.nav a.active{color:#3370ff;background:#e8f0ff}

/* Hero区域 */
.hero{background:linear-gradient(135deg,#3370ff 0%,#5b48e8 50%,#8b5cf6 100%);color:#fff;padding:100px 0 80px;text-align:center}
.hero h1{font-size:48px;font-weight:700;margin-bottom:20px;line-height:1.3}
.hero p{font-size:20px;opacity:.9;max-width:700px;margin:0 auto 40px;line-height:1.7}
.hero .btn-group{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{padding:14px 36px;border-radius:8px;font-size:16px;font-weight:600;display:inline-block;cursor:pointer;transition:all .3s}
.btn-primary{background:#fff;color:#3370ff}
.btn-primary:hover{background:#f0f1f5;color:#1b5ad9}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.1);color:#fff}
.btn-lg{padding:16px 40px;font-size:18px}

/* 通用区块 */
.section{padding:80px 0}
.section-gray{background:#f7f8fa}
.section-title{text-align:center;margin-bottom:60px}
.section-title h2{font-size:36px;font-weight:700;color:#1f2329;margin-bottom:12px}
.section-title p{font-size:17px;color:#86909c;max-width:600px;margin:0 auto}

/* 功能卡片 */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.card{background:#fff;border-radius:12px;padding:36px 28px;border:1px solid #e5e6eb;transition:box-shadow .3s,transform .3s}
.card:hover{box-shadow:0 8px 30px rgba(0,0,0,.08);transform:translateY(-4px)}
.card-icon{width:56px;height:56px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px}
.card-icon.blue{background:#e8f0ff;color:#3370ff}
.card-icon.green{background:#e8f7ed;color:#00b365}
.card-icon.orange{background:#fff4e8;color:#f77234}
.card-icon.purple{background:#f3e8ff;color:#8b5cf6}
.card-icon.cyan{background:#e8faff;color:#00b4d8}
.card-icon.pink{background:#ffe8f0;color:#e84393}
.card h3{font-size:20px;font-weight:600;margin-bottom:12px;color:#1f2329}
.card p{font-size:15px;color:#4e5969;line-height:1.8}

/* 底部 */
.footer{background:#1f2329;color:#86909c;padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:40px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer-col a{display:block;color:#86909c;font-size:14px;padding:4px 0}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2e3238;padding-top:20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-size:13px}
.footer-sitemap{font-size:13px}
.footer-sitemap a{color:#86909c;margin-left:8px}
.footer-sitemap a:hover{color:#fff}

/* FAQ页面 */
.faq-section{margin-bottom:48px}
.faq-section h2{font-size:28px;font-weight:700;color:#1f2329;margin-bottom:8px;padding-bottom:12px;border-bottom:3px solid #3370ff;display:inline-block}
.faq-section .faq-desc{color:#86909c;margin-bottom:24px;font-size:15px}
.faq-item{background:#fff;border:1px solid #e5e6eb;border-radius:10px;margin-bottom:16px;padding:24px 28px;transition:box-shadow .2s}
.faq-item:hover{box-shadow:0 4px 16px rgba(0,0,0,.06)}
.faq-item h3{font-size:18px;color:#1f2329;margin-bottom:16px;font-weight:600}
.faq-steps{list-style:none;counter-reset:step}
.faq-steps li{counter-increment:step;padding:12px 0 12px 40px;position:relative;font-size:15px;color:#4e5969;line-height:1.8;border-bottom:1px dashed #f2f3f5}
.faq-steps li:last-child{border-bottom:none}
.faq-steps li::before{content:counter(step);position:absolute;left:0;top:14px;width:28px;height:28px;background:#3370ff;color:#fff;border-radius:50%;text-align:center;line-height:28px;font-size:13px;font-weight:700}

/* 功能页面 */
.feature-block{display:flex;align-items:center;gap:60px;margin-bottom:80px;flex-wrap:wrap}
.feature-block.reverse{flex-direction:row-reverse}
.feature-text{flex:1;min-width:300px}
.feature-text h3{font-size:28px;font-weight:700;margin-bottom:16px}
.feature-text p{font-size:16px;color:#4e5969;line-height:1.9;margin-bottom:12px}
.feature-text ul{list-style:none;padding:0}
.feature-text ul li{padding:8px 0 8px 28px;position:relative;font-size:15px;color:#4e5969}
.feature-text ul li::before{content:"✓";position:absolute;left:0;color:#00b365;font-weight:700}
.feature-img{flex:1;min-width:300px;background:#f7f8fa;border-radius:16px;height:300px;display:flex;align-items:center;justify-content:center;font-size:80px;color:#ccc}

/* 面包屑 */
.breadcrumb{padding:16px 0;font-size:14px;color:#86909c}
.breadcrumb a{color:#86909c}
.breadcrumb a:hover{color:#3370ff}
.breadcrumb span{color:#1f2329}

/* 页面标题banner */
.page-banner{background:linear-gradient(135deg,#3370ff 0%,#5b48e8 100%);color:#fff;padding:60px 0;text-align:center}
.page-banner h1{font-size:40px;font-weight:700;margin-bottom:12px}
.page-banner p{font-size:18px;opacity:.9}

/* 下载页面 */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.download-card{background:#fff;border:1px solid #e5e6eb;border-radius:12px;padding:32px 24px;text-align:center;transition:box-shadow .3s}
.download-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.08)}
.download-card .platform{font-size:40px;margin-bottom:16px}
.download-card h3{font-size:20px;margin-bottom:8px}
.download-card p{font-size:14px;color:#86909c;margin-bottom:20px}
.download-card .btn{display:block;width:100%}

/* 关于页面 */
.about-content{max-width:800px;margin:0 auto}
.about-content h2{font-size:28px;margin:40px 0 16px;color:#1f2329}
.about-content p{font-size:16px;color:#4e5969;line-height:1.9;margin-bottom:16px}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:24px;margin:40px 0}
.stat-item{text-align:center;padding:28px;background:#f7f8fa;border-radius:12px}
.stat-item .num{font-size:36px;font-weight:700;color:#3370ff}
.stat-item .label{font-size:14px;color:#86909c;margin-top:8px}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h3{font-size:20px;margin-bottom:20px}
.contact-info p{font-size:15px;color:#4e5969;margin-bottom:12px}
.contact-form input,.contact-form textarea{width:100%;padding:12px 16px;border:1px solid #e5e6eb;border-radius:8px;font-size:15px;margin-bottom:16px;font-family:inherit}
.contact-form textarea{height:120px;resize:vertical}
.contact-form button{padding:14px 36px;background:#3370ff;color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer}

/* 响应式 */
@media(max-width:768px){
  .hero h1{font-size:32px}
  .hero p{font-size:16px}
  .section-title h2{font-size:28px}
  .feature-block{gap:30px}
  .feature-block .feature-text h3{font-size:22px}
  .nav{display:none}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}