*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',Arial,sans-serif}
body{background:#f0f4f8;color:#1e293b}
.container{max-width:1150px;margin:0 auto;padding:0 20px}
/* navbar */
.navbar{background:linear-gradient(135deg,#1e3a8a,#3b82f6);position:sticky;top:0;z-index:100}
.nav-inner{display:flex;justify-content:space-between;align-items:center;padding:14px 20px}
.logo{color:#fff;font-size:22px;font-weight:bold;text-decoration:none}
.nav-links{display:flex;gap:18px;list-style:none;align-items:center}
.nav-links a{color:#dbeafe;text-decoration:none;font-size:14px}
.nav-links a:hover,.nav-links a.active{color:#fff;font-weight:600}
.btn-nav{background:#f59e0b!important;color:#1e293b!important;padding:7px 14px;border-radius:8px;font-weight:600}
/* hero */
.hero{background:linear-gradient(135deg,#1e3a8a,#3b82f6);color:#fff;text-align:center;padding:80px 20px}
.hero h1{font-size:42px;margin-bottom:12px}.hero p{font-size:18px;opacity:.9;margin-bottom:25px}
.btn{display:inline-block;padding:13px 28px;border-radius:10px;text-decoration:none;font-weight:600}
.btn-orange{background:#f59e0b;color:#1e293b}.btn-white{background:#fff;color:#1e3a8a;margin-left:10px}
/* sections */
section{padding:55px 0}.section-title{text-align:center;font-size:30px;margin-bottom:8px}
.section-sub{text-align:center;color:#64748b;margin-bottom:35px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:800px){.grid2{grid-template-columns:1fr}.hero h1{font-size:30px}}
.card{background:#fff;border-radius:14px;padding:25px;box-shadow:0 3px 10px rgba(0,0,0,.08);text-align:center}
.card .icon{font-size:38px;margin-bottom:12px}
.card h3{margin-bottom:8px;color:#1e3a8a}
.card p{color:#64748b;font-size:14px}
/* class cards */
.class-card{background:#fff;border-radius:14px;padding:22px;box-shadow:0 3px 10px rgba(0,0,0,.08);border-top:4px solid #3b82f6}
.class-card h3{color:#1e3a8a;margin-bottom:6px}.class-card p{font-size:13px;color:#64748b;margin-bottom:12px}
.tag{display:inline-block;background:#e0ecff;color:#1d4ed8;font-size:12px;padding:3px 10px;border-radius:20px;margin:2px}
/* forms */
.panel{background:#fff;border-radius:14px;padding:28px;box-shadow:0 3px 10px rgba(0,0,0,.08);max-width:480px;margin:40px auto}
.panel.wide{max-width:900px}
.panel h2{text-align:center;margin-bottom:20px;color:#1e3a8a}
form input,form select,form textarea{width:100%;padding:11px;margin-bottom:12px;border:1px solid #cbd5e1;border-radius:8px;font-size:14px}
form button{background:#2563eb;color:#fff;border:none;padding:12px;width:100%;border-radius:8px;font-size:15px;cursor:pointer;font-weight:600}
form button:hover{background:#1d4ed8}
.alert{padding:10px;border-radius:8px;margin-bottom:14px;font-size:14px}
.ok{background:#dcfce7;color:#166534}.err{background:#fee2e2;color:#991b1b}
/* dashboard */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:15px;margin-bottom:25px}
.stat{background:#fff;border-radius:12px;padding:20px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.stat h2{font-size:30px;color:#2563eb}.stat p{color:#64748b;font-size:13px}
table{width:100%;border-collapse:collapse;font-size:13px;background:#fff}
th,td{padding:10px;border-bottom:1px solid #e2e8f0;text-align:left}
th{background:#f1f5f9}.del{color:#dc2626;text-decoration:none}
/* footer */
.footer{background:#1e293b;color:#cbd5e1;padding:40px 0 15px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:25px}
.footer a{display:block;color:#94a3b8;text-decoration:none;margin:5px 0;font-size:14px}
.footer h4{color:#fff;margin-bottom:10px}.copy{text-align:center;font-size:12px;color:#64748b;margin-top:25px}