/* 钉钉官网样式 - SEO优化 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a2e;background:#f8f9fc;line-height:1.7}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;height:auto}

/* Header */
.header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.08)}
.nav{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo a{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:#1677ff}
.nav-menu{display:flex;gap:28px}
.nav-menu a{font-size:14px;color:#333;transition:color .2s;padding:4px 0;border-bottom:2px solid transparent}
.nav-menu a:hover{color:#1677ff;border-bottom-color:#1677ff}
.nav-actions{display:flex;gap:12px;align-items:center}

/* Buttons */
.btn-primary{display:inline-block;background:#1677ff;color:#fff;padding:10px 24px;border-radius:6px;font-size:14px;font-weight:600;transition:background .2s;text-align:center}
.btn-primary:hover{background:#0958d9}
.btn-secondary{display:inline-block;background:#fff;color:#1677ff;padding:10px 24px;border-radius:6px;font-size:14px;font-weight:600;border:1px solid #1677ff;transition:all .2s;text-align:center}
.btn-secondary:hover{background:#e6f4ff}
.btn-large{padding:14px 36px;font-size:16px}

/* Hero */
.hero{background:linear-gradient(135deg,#1677ff 0%,#0958d9 50%,#003eb3 100%);color:#fff;padding:100px 20px;text-align:center}
.hero-content{max-width:800px;margin:0 auto}
.hero h1{font-size:44px;font-weight:700;line-height:1.3;margin-bottom:20px}
.hero-desc{font-size:18px;line-height:1.8;opacity:.92;margin-bottom:36px}
.hero-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-cta .btn-secondary{background:transparent;border-color:#fff;color:#fff}
.hero-cta .btn-secondary:hover{background:rgba(255,255,255,.15)}

/* Sections */
section{padding:80px 20px}
section h2{text-align:center;font-size:32px;font-weight:700;margin-bottom:10px;color:#1a1a2e}
.section-desc{text-align:center;color:#666;font-size:16px;margin-bottom:48px;max-width:600px;margin-left:auto;margin-right:auto}

/* Features Grid */
.features{background:#fff}
.features-grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:28px}
.feature-card{background:#f8f9fc;border-radius:12px;padding:32px;border:1px solid #eee;transition:all .3s}
.feature-card:hover{box-shadow:0 8px 24px rgba(0,0,0,.1);transform:translateY(-4px)}
.feature-card h3{font-size:20px;font-weight:700;margin-bottom:12px;color:#1677ff}
.feature-card p{font-size:14px;color:#555;line-height:1.8;margin-bottom:16px}
.card-link{color:#1677ff;font-weight:600;font-size:14px}
.card-link:hover{text-decoration:underline}

/* Stats */
.stats{background:linear-gradient(135deg,#f0f5ff 0%,#e6f4ff 100%)}
.stats-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;text-align:center}
.stat-item{display:flex;flex-direction:column;gap:8px}
.stat-number{font-size:36px;font-weight:800;color:#1677ff}
.stat-label{font-size:15px;color:#555}

/* CTA */
.cta-section{background:#1677ff;color:#fff;text-align:center}
.cta-section h2{color:#fff}
.cta-section p{color:rgba(255,255,255,.85);margin-bottom:32px;font-size:16px}
.cta-section .btn-primary{background:#fff;color:#1677ff}
.cta-section .btn-primary:hover{background:#e6f4ff}

/* Footer */
.footer{background:#1a1a2e;color:#ccc;padding:48px 20px 24px}
.footer-content{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-links h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer-links a{display:block;font-size:14px;color:#999;margin-bottom:8px;transition:color .2s}
.footer-links a:hover{color:#1677ff}
.footer-info p{font-size:13px;color:#777;margin-bottom:4px}
.footer-sitemap{max-width:1200px;margin:0 auto;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);display:flex;gap:24px;font-size:13px}
.footer-sitemap a{color:#666}
.footer-sitemap a:hover{color:#1677ff}

/* Product Pages */
.product-hero{background:linear-gradient(135deg,#f0f5ff 0%,#e6f4ff 50%,#d4e6ff 100%);padding:80px 20px;text-align:center}
.product-hero h1{font-size:38px;color:#1a1a2e;margin-bottom:16px}
.product-hero-desc{font-size:17px;color:#555;max-width:700px;margin:0 auto;line-height:1.8}
.product-content{max-width:1000px;margin:0 auto;padding:60px 20px}
.product-content h2{font-size:26px;color:#1a1a2e;margin-bottom:20px;padding-bottom:10px;border-bottom:3px solid #1677ff;display:inline-block}
.product-intro{margin-bottom:48px}
.product-intro p{font-size:15px;color:#555;line-height:1.9;margin-bottom:14px}
.product-features-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-bottom:48px}
.product-features-list .feat-item{background:#fff;padding:24px;border-radius:10px;border:1px solid #eee}
.product-features-list .feat-item h3{font-size:17px;color:#1677ff;margin-bottom:8px}
.product-features-list .feat-item p{font-size:14px;color:#666;line-height:1.7}

/* FAQ */
.faq-section{margin-bottom:48px}
.faq-section h2{margin-bottom:28px}
.faq-item{background:#fff;border-radius:10px;padding:28px;margin-bottom:20px;border:1px solid #eee}
.faq-item h3{font-size:18px;color:#1a1a2e;margin-bottom:14px}
.faq-steps{margin-top:12px}
.faq-steps .step{margin-bottom:12px;padding-left:20px;border-left:3px solid #e6f4ff;font-size:14px;color:#555;line-height:1.8}
.faq-steps .step strong{color:#1677ff}

/* Breadcrumb */
.breadcrumb{max-width:1200px;margin:0 auto;padding:16px 20px;font-size:13px;color:#999}
.breadcrumb a{color:#1677ff}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb span{color:#999}

/* Sitemap Page */
.sitemap-section{max-width:1000px;margin:0 auto;padding:60px 20px}
.sitemap-section h1{font-size:32px;margin-bottom:32px;text-align:center}
.sitemap-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.sitemap-col{background:#fff;padding:24px;border-radius:10px;border:1px solid #eee}
.sitemap-col h3{font-size:18px;color:#1677ff;margin-bottom:14px}
.sitemap-col a{display:block;font-size:14px;color:#555;padding:6px 0;border-bottom:1px solid #f5f5f5}
.sitemap-col a:hover{color:#1677ff}

/* Responsive */
@media(max-width:768px){
    .hero h1{font-size:28px}
    .hero-desc{font-size:15px}
    .features-grid{grid-template-columns:1fr}
    .nav-menu{display:none}
    .hero{padding:60px 16px}
    section{padding:48px 16px}
}