:root {
    --bg: #f6f7fb;
    --panel: #ffffff;
    --line: #e5e7eb;
    --text: #111827;
    --muted: #6b7280;
    --brand: #0f766e;
    --brand-dark: #115e59;
    --danger: #b91c1c;
    --success: #166534;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: inherit; text-decoration: none; }
.admin-shell { display: flex; min-height: 100vh; }
.sidebar { width: 250px; background: #0f172a; color: #fff; padding: 24px 18px; }
.brand { font-weight: 700; font-size: 22px; margin-bottom: 24px; }
.nav-link { display: block; padding: 12px 14px; margin: 8px 0; border-radius: 10px; background: rgba(255,255,255,.04); }
.nav-link:hover { background: rgba(255,255,255,.1); }
.content-area { flex: 1; padding: 24px; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 20px; }
.topbar h1 { margin: 0 0 6px; }
.muted { color: var(--muted); margin: 0; }
.topbar-user { display: flex; align-items: center; gap: 12px; }
.card, .table-wrap, .form-card, .stats-grid .stat { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 8px 22px rgba(15, 23, 42, .04); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat { padding: 20px; }
.stat h3 { margin: 0 0 8px; font-size: 14px; color: var(--muted); }
.stat strong { font-size: 28px; }
.actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 18px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--brand); background: var(--brand); color: #fff; cursor: pointer; }
.btn:hover { background: var(--brand-dark); }
.btn-outline { background: transparent; color: var(--brand); }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.table-wrap { overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.badge { display: inline-block; padding: 6px 10px; border-radius: 999px; font-size: 12px; background: #ecfeff; color: var(--brand-dark); }
.form-card { padding: 20px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group.full { grid-column: 1 / -1; }
input, select, textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; font: inherit; background: #fff; }
textarea { min-height: 140px; resize: vertical; }
.alert { padding: 14px 16px; border-radius: 12px; margin-bottom: 16px; }
.alert-success { background: #ecfdf5; color: var(--success); }
.alert-error { background: #fef2f2; color: var(--danger); }
.login-shell { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: 100%; max-width: 420px; background: #fff; border-radius: 18px; border: 1px solid var(--line); padding: 28px; box-shadow: 0 15px 35px rgba(15,23,42,.08); }
.thumb { width: 70px; height: 70px; object-fit: cover; border-radius: 10px; border: 1px solid var(--line); }
.note { padding: 12px 14px; border-radius: 12px; background: #f8fafc; border: 1px dashed #cbd5e1; color: var(--muted); }
@media (max-width: 900px) { .admin-shell { flex-direction: column; } .sidebar { width: 100%; } .form-grid { grid-template-columns: 1fr; } }