:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --primary: #18181b;
  --primary-text: #ffffff;
  --danger: #dc2626;
  --success-bg: #ecfdf5;
  --success-text: #047857;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --warning-bg: #fffbeb;
  --warning-text: #92400e;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: inherit; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar .brand { font-weight: 700; text-decoration: none; font-size: 1.05rem; }
.topbar nav a { margin-left: 18px; text-decoration: none; color: var(--muted); font-size: 0.9rem; }
.topbar nav a:hover { color: var(--text); }

.container { max-width: 1100px; margin: 0 auto; padding: 28px; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px; margin-bottom: 20px;
}

.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
h1 { font-size: 1.35rem; margin: 0 0 4px; }

label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 14px; }
label input[type=text], label input[type=password], label select, textarea {
  display: block; width: 100%; margin-top: 6px; padding: 9px 11px; border-radius: 8px;
  border: 1px solid var(--border); font-size: 0.95rem; color: var(--text); background: #fff;
}
label input[type=color] { margin-top: 6px; width: 60px; height: 36px; padding: 2px; border-radius: 8px; border: 1px solid var(--border); }
label input[type=file] { margin-top: 6px; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; margin: 0; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }

.btn {
  display: inline-block; padding: 9px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: #fff; color: var(--text); font-size: 0.88rem; cursor: pointer; text-decoration: none;
}
.btn-primary { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }
.btn-sm { padding: 6px 11px; font-size: 0.8rem; }
.btn-danger { color: var(--danger); border-color: #fecaca; }
.btn:hover { opacity: 0.85; }

.flash-list { margin-bottom: 18px; }
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 8px; font-size: 0.88rem; }
.flash-success { background: var(--success-bg); color: var(--success-text); }
.flash-error { background: var(--error-bg); color: var(--error-text); }
.flash-warning { background: var(--warning-bg); color: var(--warning-text); }

.login-wrap { display: flex; justify-content: center; margin-top: 8vh; }
.login-card { width: 320px; }
.login-card h1 { margin-bottom: 2px; }
.muted { color: var(--muted); }
.small { font-size: 0.82rem; }

.qr-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.qr-card { display: flex; flex-direction: column; padding: 16px; }
.qr-inactive { opacity: 0.55; }
.qr-card-thumb { display: flex; justify-content: center; margin-bottom: 12px; }
.qr-card-thumb img { width: 140px; height: 140px; object-fit: contain; border: 1px solid var(--border); border-radius: 10px; }
.qr-card-body h3 { margin: 0 0 4px; font-size: 1rem; }
.qr-card-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.tag { display: inline-block; font-size: 0.72rem; background: #f4f4f5; border-radius: 6px; padding: 2px 8px; margin-right: 6px; }
.tag-off { background: #fee2e2; color: #991b1b; }
.scan-count { font-weight: 600; margin-top: 8px; }

.empty-state { text-align: center; padding: 40px 20px; }

.form-layout { display: grid; grid-template-columns: 1fr 360px; gap: 22px; align-items: start; }
@media (max-width: 900px) { .form-layout { grid-template-columns: 1fr; } }
.preview-card { position: sticky; top: 20px; text-align: center; }
#preview-wrap { display: flex; justify-content: center; padding: 12px; background: #fafafa; border-radius: 10px; }
#preview-img { width: 260px; height: 260px; object-fit: contain; }
.preview-ok { color: var(--success-text); }
.preview-warning { color: var(--warning-text); }

.data-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.data-table th, .data-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }

.bar-chart { display: flex; align-items: flex-end; gap: 3px; height: 140px; overflow-x: auto; padding-top: 10px; }
.bar-col { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; min-width: 14px; }
.bar { width: 10px; background: var(--primary); border-radius: 3px 3px 0 0; min-height: 2px; }
.bar-label { font-size: 0.55rem; color: var(--muted); margin-top: 4px; writing-mode: vertical-rl; }