*{box-sizing:border-box}
body{margin:0;font-family:Tahoma,Arial,sans-serif;background:#f5f7fb;color:#222}
a{text-decoration:none}
.container{max-width:1200px;margin:auto;padding:0 20px}
.site-header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.site-header .inner{display:flex;align-items:center;justify-content:space-between;padding:18px 0}
.logo{font-size:30px;font-weight:700;color:#0f172a}
.top-nav a{margin-left:18px;color:#333;font-weight:600}
.hero{padding:70px 0;background:#e9eff5}
.hero-box{background:#fff;border-radius:18px;padding:40px;box-shadow:0 8px 30px rgba(0,0,0,.06)}
.btn{display:inline-block;background:#0f172a;color:#fff;padding:12px 22px;border-radius:10px}
.site-footer{padding:24px 0;text-align:center;background:#fff;margin-top:40px}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-box{width:100%;max-width:460px;background:#fff;padding:32px;border-radius:18px;box-shadow:0 8px 30px rgba(0,0,0,.08)}
.login-box h1{margin-top:0;margin-bottom:10px}
.muted{color:#666}
label{display:block;margin-bottom:8px;font-weight:700}
input{width:100%;padding:14px;border:1px solid #ddd;border-radius:10px;margin-bottom:16px}
button{width:100%;padding:14px;border:0;border-radius:10px;background:#0f172a;color:#fff;font-size:16px;cursor:pointer}
.alert{background:#fee2e2;color:#991b1b;padding:12px 14px;border-radius:10px;margin-bottom:16px}
.admin-wrap{display:flex;min-height:100vh}
.sidebar{width:260px;background:#0f172a;color:#fff;padding:24px 18px}
.brand{font-size:24px;font-weight:700;margin-bottom:24px}
.nav a{display:block;color:#dbe4ff;padding:12px 14px;border-radius:10px;margin-bottom:8px}
.nav a:hover,.nav a.active{background:#1e293b;color:#fff}
.main{flex:1;padding:24px}
.topbar{background:#fff;padding:18px 22px;border-radius:14px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 12px rgba(0,0,0,.06);margin-bottom:24px}
.card{background:#fff;border-radius:14px;padding:22px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}
.stat{background:#fff;border-radius:14px;padding:20px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.num{font-size:28px;font-weight:700;margin-top:10px}
@media (max-width:900px){
  .admin-wrap{display:block}
  .sidebar{width:100%}
  .site-header .inner{display:block}
  .top-nav{margin-top:10px}
}