* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

:root {
    --biru-tua: #0b2f6b;
    --biru: #1565c0;
    --biru-muda: #e3f2fd;
    --kuning: #fbbf24;
    --abu: #f1f5f9;
    --teks: #0f172a;
    --muted: #64748b;
    --merah: #dc2626;
    --hijau: #16a34a;
}

body {
    margin: 0;
    background: var(--abu);
    color: var(--teks);
}

.topbar {
    background: linear-gradient(135deg, var(--biru-tua), var(--biru));
    color: white;
    padding: 24px;
    border-bottom: 5px solid var(--kuning);
}

.topbar-inner,
.container {
    max-width: 1100px;
    margin: auto;
}

.container {
    padding: 24px 16px;
}

.card {
    background: white;
    border-radius: 18px;
    padding: 22px;
    box-shadow: 0 8px 24px rgba(15,23,42,.08);
    margin-bottom: 18px;
}

h1, h2, h3 {
    margin-top: 0;
    color: var(--biru-tua);
}

.topbar h1 {
    color: white;
    margin: 0;
}

.topbar p {
    margin: 6px 0 0;
}

.btn {
    display: inline-block;
    text-decoration: none;
    border: none;
    cursor: pointer;
    padding: 12px 16px;
    border-radius: 12px;
    background: var(--biru);
    color: white;
    font-weight: bold;
}

.btn:hover {
    background: var(--biru-tua);
}

.btn-secondary {
    background: #475569;
}

.btn-danger {
    background: var(--merah);
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    padding: 14px;
    border-radius: 12px;
    margin-bottom: 18px;
    font-weight: bold;
}

.alert-warning {
    background: #fff7ed;
    color: #9a3412;
    padding: 14px;
    border-radius: 12px;
    margin-bottom: 18px;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    padding: 14px;
    border-radius: 12px;
    margin-bottom: 18px;
}

input[type="text"],
input[type="password"],
input[type="file"] {
    width: 100%;
    padding: 13px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    margin-top: 6px;
}

.menu {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    padding: 12px;
    border-bottom: 1px solid #e2e8f0;
    text-align: left;
}

th {
    background: var(--biru-muda);
    color: var(--biru-tua);
}