:root {
    --primary: #1f6feb;
    --primary-dark: #1657c2;
    --bg: #f5f6f8;
    --text: #1c1f26;
    --muted: #6b7280;
    --border: #e2e5ea;
    --card-bg: #ffffff;
    --danger: #c0392b;
    --success: #1e7a34;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
.topbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
}
.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); font-size: 18px; }
.nav { display: flex; gap: 16px; align-items: center; }
.nav a { color: var(--primary); text-decoration: none; font-size: 14px; }
.nav-user { color: var(--muted); font-size: 14px; }
.container { max-width: 1100px; margin: 0 auto; padding: 24px 20px 60px; }
.footer { text-align: center; color: var(--muted); padding: 30px; font-size: 13px; }

.page-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }

.btn {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #eef2ff; color: var(--primary-dark); }
.btn-small { padding: 6px 10px; font-size: 12px; background: #eee; }

.form { display: flex; flex-direction: column; gap: 16px; max-width: 420px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--text); font-weight: 600; }
.form input, .form select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    font-weight: 400;
}

.auth-box, .form-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    max-width: 480px;
    margin: 20px auto;
}

.alert { padding: 10px 14px; border-radius: 8px; font-size: 14px; }
.alert-error { background: #fdecea; color: var(--danger); }
.alert-success { background: #eafaf0; color: var(--success); }
.alert-info { background: #eef2ff; color: var(--primary-dark); }

.grid-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 18px;
}
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: var(--text);
    display: block;
}
.card-img { width: 100%; height: 160px; object-fit: cover; display: block; background: #eee; }
.card-img-empty { display: flex; align-items: center; justify-content: center; color: var(--muted); height: 160px; background: #eee; }
.card-body { padding: 12px 14px; display: flex; flex-direction: column; gap: 4px; }
.code-badge {
    display: inline-block;
    font-family: monospace;
    background: #eef2ff;
    color: var(--primary-dark);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 13px;
    width: fit-content;
}
.card-body small { color: var(--muted); }

.back-link { display: inline-block; margin-bottom: 16px; color: var(--primary); text-decoration: none; }

.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.detail-image img { width: 100%; border-radius: 12px; border: 1px solid var(--border); }
.detail-info h1 { margin-top: 0; }
.muted { color: var(--muted); }
.muted.small { font-size: 12px; }

.qr-box {
    display: flex;
    gap: 16px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin: 18px 0;
}
.qr-preview { width: 120px; height: 120px; }

.update-box { border: 1px dashed var(--border); border-radius: 10px; padding: 14px; margin-top: 10px; }
.update-box summary { cursor: pointer; font-weight: 600; }

.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
.table th, .table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.table th { background: #f0f2f5; }
.badge { padding: 3px 8px; border-radius: 6px; font-size: 12px; }
.badge-ok { background: #eafaf0; color: var(--success); }
.badge-off { background: #fdecea; color: var(--danger); }

.empty-state { color: var(--muted); text-align: center; padding: 60px 20px; }

@media (max-width: 700px) {
    .detail-grid { grid-template-columns: 1fr; }
}