* { margin:0; padding:0; box-sizing:border-box; }
body { font-family:'Microsoft YaHei',sans-serif; background:#263238; color:#fff; line-height:1.75; }
.header { background:linear-gradient(135deg,#00BCD4,#009688); padding:22px; position:sticky; top:0; z-index:1000; box-shadow:0 4px 20px rgba(0,188,212,0.3); }
.header-inner { max-width:1280px; margin:0 auto; display:flex; justify-content:space-between; align-items:center; }
.logo { font-size:32px; font-weight:800; color:white; letter-spacing:1px; }
.nav { display:flex; gap:32px; list-style:none; }
.nav a { color:white; text-decoration:none; padding:10px 22px; border-radius:8px; font-weight:600; transition:all 0.3s; }
.nav a:hover,.nav a.active { background:rgba(255,255,255,0.2); }
.hero { padding:120px 20px; text-align:center; background:linear-gradient(180deg,#263238 0%,#37474F 100%); }
.hero h1 { font-size:54px; margin-bottom:28px; background:linear-gradient(135deg,#00BCD4,#009688); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero p { font-size:21px; max-width:780px; margin:0 auto 42px; color:rgba(255,255,255,0.85); }
.hero-btn { display:inline-block; background:linear-gradient(135deg,#00BCD4,#009688); color:white; padding:18px 50px; border-radius:50px; text-decoration:none; font-weight:bold; font-size:18px; transition:all 0.3s; }
.hero-btn:hover { transform:scale(1.05); box-shadow:0 12px 40px rgba(0,188,212,0.4); }
.section { padding:95px 20px; }
.section-alt { background:#303F47; }
.section-title { text-align:center; font-size:42px; margin-bottom:65px; color:#00BCD4; }
.cards { max-width:1300px; margin:0 auto; display:grid; grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); gap:35px; }
.card { background:linear-gradient(145deg,#37474F,#263238); padding:48px; border-radius:15px; text-align:center; border:1px solid rgba(0,188,212,0.2); transition:all 0.35s; }
.card:hover { transform:translateY(-12px); border-color:rgba(0,188,212,0.6); box-shadow:0 20px 60px rgba(0,188,212,0.25); }
.card-icon { font-size:65px; margin-bottom:25px; }
.card h3 { font-size:24px; margin-bottom:20px; color:#00BCD4; }
.card p { color:rgba(255,255,255,0.7); line-height:1.8; }
.footer { background:linear-gradient(135deg,#00BCD4,#009688); color:white; padding:65px 20px 35px; margin-top:85px; }
.footer-inner { max-width:1300px; margin:0 auto; }
.footer-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(250px,1fr)); gap:50px; margin-bottom:40px; }
.footer-col h4 { font-size:22px; margin-bottom:25px; }
.footer-col a { color:rgba(255,255,255,0.85); text-decoration:none; display:block; margin-bottom:12px; }
.footer-col a:hover { color:white; }
.copyright { text-align:center; padding-top:30px; border-top:1px solid rgba(255,255,255,0.25); }