:root {
  --bg: #f3f5f8;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #6b7684;
  --line: #dde2e8;
  --accent: #e8730c;
  --accent-ink: #ffffff;
  --ok: #1f9d55;
  --off: #9aa4b0;
  --err: #c62828;
  --header: #1c2430;
  --tile: #0f141a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --panel: #1b2129;
    --text: #e6eaef;
    --muted: #8d98a6;
    --line: #2c3540;
    --header: #0c1015;
    --tile: #07090c;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--err); min-height: 1.2em; margin: 0; }
code { background: var(--bg); padding: 0 4px; border-radius: 3px; }

button, .button {
  font: inherit; border: 0; border-radius: 6px; padding: 7px 14px; cursor: pointer;
  background: var(--accent); color: var(--accent-ink); text-decoration: none; display: inline-block;
}
button.secondary, .button.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
button.link { background: none; color: inherit; padding: 4px 6px; text-decoration: underline; }
button.danger { background: transparent; color: var(--err); border: 1px solid var(--line); padding: 3px 9px; }
input, select { font: inherit; padding: 7px 9px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); }
label { display: flex; flex-direction: column; gap: 4px; }
label.inline { flex-direction: row; align-items: center; gap: 6px; }
.row { display: flex; gap: 8px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }

/* Đăng nhập */
.login { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.login form { width: min(360px, 100%); display: flex; flex-direction: column; gap: 12px; }
.login h1 { font-size: 20px; margin: 0 0 6px; }

/* Khung chính */
#app { display: flex; flex-direction: column; height: 100%; }
header { display: flex; align-items: center; gap: 16px; padding: 0 16px; height: 52px; background: var(--header); color: #fff; flex-wrap: wrap; }
.brand { font-weight: 600; white-space: nowrap; }
nav { display: flex; gap: 4px; flex: 1; overflow-x: auto; scrollbar-width: none; }
nav button { background: transparent; color: #c7cfd9; border-radius: 6px; white-space: nowrap; }
nav button.active { background: rgba(255,255,255,.12); color: #fff; }
.user { font-size: 13px; color: #c7cfd9; white-space: nowrap; }
.banner { background: #fff3cd; color: #6b4d00; padding: 8px 16px; font-size: 13px; }
main { flex: 1; min-height: 0; overflow: auto; }
.tab { padding: 16px; height: 100%; }
.toolbar { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }

/* Lưới live */
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); }
.tile { background: var(--tile); border-radius: 10px; overflow: hidden; position: relative; aspect-ratio: 16/9; }
.tile video { width: 100%; height: 100%; object-fit: contain; display: block; background: #000; }
.tile .label { position: absolute; left: 0; right: 0; top: 0; padding: 8px 10px; display: flex; justify-content: space-between; gap: 8px;
  background: linear-gradient(rgba(0,0,0,.65), transparent); color: #fff; font-size: 13px; }
.tile .placeholder { position: absolute; inset: 0; display: grid; place-items: center; color: #8d98a6; text-align: center; padding: 16px; }
.tile .actions { position: absolute; right: 8px; bottom: 8px; display: flex; gap: 6px; }
.tile .actions button { background: rgba(0,0,0,.55); padding: 4px 9px; font-size: 12px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--off); margin-right: 6px; vertical-align: middle; }
.dot.on { background: var(--ok); box-shadow: 0 0 0 3px rgba(31,157,85,.25); }
.empty { padding: 40px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: 10px; }

/* Bản đồ */
.map-layout { display: grid; grid-template-columns: 280px 1fr; gap: 12px; height: 100%; min-height: 480px; }
.side { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px; display: flex; flex-direction: column; gap: 10px; overflow: auto; }
.side h3 { margin: 4px 0 0; font-size: 14px; }
#map { border-radius: 10px; border: 1px solid var(--line); min-height: 400px; }
.list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.list li { padding: 8px 10px; border-radius: 6px; cursor: pointer; border: 1px solid transparent; }
.list li:hover { background: var(--bg); }
.list li.active { border-color: var(--accent); }
.list li small { display: block; color: var(--muted); }

/* Xem lại */
.pb-layout { display: grid; grid-template-columns: 300px 1fr; gap: 12px; }
.pb-list { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 8px; max-height: 70vh; overflow: auto; }
.pb-player { display: flex; flex-direction: column; gap: 8px; }
.pb-player video { width: 100%; max-height: 70vh; background: #000; border-radius: 10px; }

/* Ảnh */
.photo-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.photo { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; cursor: pointer; padding: 0; text-align: left; color: var(--text); }
.photo img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; background: #000; }
.photo span { display: block; padding: 6px 8px; font-size: 12px; }
.photo small { color: var(--muted); }
#pm-img { width: 100%; max-height: 75vh; object-fit: contain; background: #000; border-radius: 6px; }
.token { font-family: ui-monospace, Consolas, monospace; font-size: 11px; word-break: break-all; }

/* Quản lý */
.admin-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; align-items: start; }
.admin-grid h3 { margin-top: 0; }
table { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
th, td { text-align: left; padding: 7px 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { color: var(--muted); font-weight: 500; font-size: 12px; }
td .row { justify-content: flex-end; flex-wrap: nowrap; }
.form { display: flex; gap: 8px; flex-wrap: wrap; }
.form input { flex: 1 1 140px; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: center; padding: 16px; z-index: 2000; }
.modal-body { background: var(--panel); border-radius: 10px; padding: 12px; width: min(960px, 100%); display: flex; flex-direction: column; gap: 8px; }
#modal-player .tile { aspect-ratio: 16/9; }

@media (max-width: 800px) {
  header { height: auto; padding: 8px 16px; }
  .grid { grid-template-columns: 1fr; }
  .map-layout, .pb-layout, .admin-grid { grid-template-columns: 1fr; }
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  #map { height: 60vh; }
  table { font-size: 13px; }
}