:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #16181d;
  --muted: #6b7280;
  --brand: #2563eb;
  --danger: #dc2626;
  --ok: #059669;
  --border: #e5e7eb;
  --radius: 12px;
}
/* Tự động: theo hệ điều hành, trừ khi người dùng đã ép Sáng. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --bg: #0f1115;
    --card: #171a21;
    --text: #f3f4f6;
    --muted: #9ca3af;
    --border: #262b36;
  }
}
/* Người dùng ép Tối, kể cả khi hệ điều hành đang Sáng. */
:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #0f1115;
  --card: #171a21;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --border: #262b36;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
a { color: var(--brand); }

/* ---------- chrome ---------- */
.topbar { background: var(--card); border-bottom: 1px solid var(--border); }
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--text); }
.topbar nav { display: flex; gap: 16px; flex: 1; flex-wrap: wrap; }
.topbar nav a { font-size: 14px; text-decoration: none; color: var(--muted); }
.topbar nav a:hover { color: var(--brand); }
.logout { margin: 0; }
.page { max-width: 1080px; margin: 0 auto; padding: 22px 16px 60px; }

/* ---------- theme toggle ---------- */
.theme-toggle {
  flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; padding: 0;
  border: 1px solid var(--border); border-radius: 999px;
  background: transparent; color: var(--text);
  font-size: 15px; line-height: 1; cursor: pointer; font-family: inherit;
}
.theme-toggle:hover { border-color: var(--brand); color: var(--brand); }
/* Ghi đè display:inline-flex ở trên, nếu không thì [hidden] không có tác dụng. */
.theme-toggle[hidden] { display: none; }
.theme-toggle.floating {
  position: fixed; top: 14px; right: 14px; z-index: 20;
  background: var(--card);
}

/* ---------- primitives ---------- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
h1 { font-size: 22px; margin: 0 0 14px; }
h2 { font-size: 17px; margin: 0 0 12px; }
p.muted, .muted { color: var(--muted); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spread { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 9px 16px; border: 1px solid transparent; border-radius: 9px;
  background: var(--brand); color: #fff; font-size: 14px; font-weight: 600;
  text-decoration: none; cursor: pointer; font-family: inherit;
}
.btn:disabled { opacity: .55; cursor: progress; }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn.danger { background: var(--danger); }
.btn.sm { padding: 5px 11px; font-size: 13px; }

label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; }
input[type='text'], input[type='url'], input[type='tel'], input[type='email'],
input[type='password'], input[type='number'], input[type='datetime-local'],
input[type='search'], select, textarea {
  width: 100%; padding: 9px 11px; font-size: 14px; font-family: inherit;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 9px;
}
textarea { min-height: 80px; resize: vertical; }
input[type='file'] { font-size: 13px; }
.field { margin-bottom: 14px; }
.field .help { font-size: 12px; color: var(--muted); margin-top: 4px; }
.field .err { font-size: 12px; color: var(--danger); margin-top: 4px; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--danger); }
.checkbox { display: flex; align-items: center; gap: 8px; }
.checkbox input { width: 16px; height: 16px; }
.checkbox label { margin: 0; }

.alert { padding: 11px 14px; border-radius: 9px; font-size: 14px; margin-bottom: 14px; }
.alert.error { background: #dc262618; color: var(--danger); border: 1px solid #dc262640; }
.alert.ok { background: #05966918; color: var(--ok); border: 1px solid #05966940; }

.tag {
  font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted); white-space: nowrap;
}
.tag.on { color: var(--ok); border-color: #05966955; }
.tag.off { color: var(--danger); border-color: #dc262655; }

/* ---------- list ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
td.actions { white-space: nowrap; text-align: right; }
td.actions a, td.actions button { margin-left: 6px; }
.scroll-x { overflow-x: auto; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 14px; }
.filters .field { margin: 0; min-width: 180px; }

/* ---------- type chooser ---------- */
.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.type-card {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; text-decoration: none; color: inherit;
}
.type-card:hover { border-color: var(--brand); }
.type-card b { display: block; margin-bottom: 4px; }
.type-card span { font-size: 13px; color: var(--muted); }

/* ---------- form ---------- */
.form-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 16px; align-items: start; }
.repeater { border: 1px dashed var(--border); border-radius: var(--radius); padding: 12px; margin-bottom: 14px; }
.repeater > label { margin-bottom: 10px; }
.rep-item { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
.rep-item .rep-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.rep-item .rep-head b { font-size: 13px; color: var(--muted); }
.hours-grid { display: grid; gap: 8px; }
.hours-row { display: grid; grid-template-columns: 90px 1fr 1fr; gap: 8px; align-items: center; }
.hours-row span { font-size: 13px; }
.qr-preview { text-align: center; }
.qr-preview img { width: 100%; max-width: 240px; border-radius: 10px; background: #fff; padding: 8px; }
.short-url { font-size: 13px; word-break: break-all; }
.current-file { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- stats ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; text-align: center; }
.stat b { display: block; font-size: 24px; }
.stat span { font-size: 12px; color: var(--muted); }
.bar-row { display: grid; grid-template-columns: 100px 1fr 50px; gap: 10px; align-items: center; font-size: 13px; margin-bottom: 6px; }
.bar { background: var(--bg); border-radius: 999px; height: 10px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--brand); }
.bar-row .num { text-align: right; color: var(--muted); }

@media (max-width: 860px) {
  .form-layout { grid-template-columns: 1fr; }
}