:root{
  --bg:#f5f7fb; --card:#fff; --text:#111827; --muted:#6b7280; --border:#e5e7eb;
  --primary:#2563eb; --nav:#111827; --nav2:#1f2937; --green:#059669; --red:#dc2626;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
.front-header{background:#fff;border-bottom:1px solid var(--border);padding:18px 40px;display:flex;justify-content:space-between;align-items:center}
.logo{font-weight:800;font-size:22px}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:10px 16px;border-radius:10px;border:0;cursor:pointer}
.hero{padding:70px 40px;text-align:center}
.hero h1{font-size:44px;margin:0 0 12px}
.hero p{font-size:18px;color:var(--muted)}
.front-card-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:1000px;margin:0 auto 60px;padding:0 30px}
.card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:0 6px 20px rgba(15,23,42,.05)}
.admin-layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}
.sidebar{background:var(--nav);color:#fff;padding:24px 18px}
.sidebar .brand{font-size:22px;font-weight:800;margin-bottom:28px}
.sidebar a{display:block;color:#d1d5db;padding:11px 12px;border-radius:10px;margin-bottom:5px}
.sidebar a:hover,.sidebar a.active{background:var(--nav2);color:#fff}
.main{padding:28px}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden}
.table th,.table td{padding:13px;border-bottom:1px solid var(--border);text-align:left}
.table th{background:#f9fafb;font-size:13px;color:#374151}
.badge{display:inline-block;padding:4px 9px;border-radius:999px;font-size:12px;background:#dbeafe;color:#1e40af}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-box{width:100%;max-width:420px;background:#fff;border:1px solid var(--border);border-radius:18px;padding:28px;box-shadow:0 12px 28px rgba(15,23,42,.08)}
.input{width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;margin:7px 0 14px}
.alert{background:#fef2f2;color:#991b1b;border:1px solid #fecaca;padding:10px;border-radius:10px;margin-bottom:12px}
@media(max-width:900px){.admin-layout{grid-template-columns:1fr}.sidebar{position:relative}.grid,.front-card-wrap{grid-template-columns:1fr}.hero h1{font-size:32px}}