:root {
  color-scheme: dark;
  --bg: #0d1118;
  --panel: #141a24;
  --panel-2: #101621;
  --text: #eef4ff;
  --muted: #8d99ac;
  --line: #273244;
  --blue: #4f8cff;
  --green: #21c777;
  --red: #ff5b6b;
  --warn: #ffbd4a;
  --radius: 8px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}
button, input, select, textarea {
  font: inherit;
}
button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: var(--radius);
  min-height: 36px;
  padding: 0 12px;
  cursor: pointer;
}
button.primary { background: var(--blue); border-color: var(--blue); color: white; }
button.danger { border-color: rgba(255,91,107,.55); color: #ffd7dc; }
button.ghost { background: transparent; }
button:disabled { opacity: .55; cursor: not-allowed; }
input, select, textarea {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #0b1018;
  color: var(--text);
  padding: 8px 10px;
}
textarea { min-height: 92px; resize: vertical; }

.auth {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.auth-box {
  width: min(380px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}
.auth-box h1 { margin: 0 0 4px; font-size: 24px; }
.auth-box p { margin: 0 0 16px; color: var(--muted); }
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 14px; }
.tabs button.active { background: var(--blue); border-color: var(--blue); }
.form { display: grid; gap: 10px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 12px; }

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 300px;
}
.sidebar, .preview {
  background: var(--panel);
  border-color: var(--line);
}
.sidebar {
  border-right: 1px solid var(--line);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.brand { font-weight: 700; font-size: 18px; }
.user-line { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.nav { display: grid; gap: 8px; }
.nav button { text-align: left; }
.nav button.active { border-color: var(--blue); color: #cfe0ff; }
.sidebar-bottom { margin-top: auto; display: grid; gap: 8px; }

.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.topbar {
  min-height: 58px;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  align-items: center;
  padding: 10px;
}
.mobile-menu { display: none; }
.filters {
  display: flex;
  gap: 8px;
  padding: 10px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.filters button { white-space: nowrap; }
.filters button.active { background: #1e3358; border-color: var(--blue); }

.grid {
  padding: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
  overflow: auto;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  overflow: hidden;
  min-width: 0;
}
.card.active { border-color: var(--blue); }
.card.selected { border-color: var(--green); box-shadow: 0 0 0 1px var(--green) inset; }
.thumb {
  position: relative;
  height: 116px;
  display: grid;
  place-items: center;
  background: #080d14;
  color: #9fb3d1;
  font-size: 36px;
}
.fav-toggle, .view-toggle {
  position: absolute;
  top: 6px;
  min-height: 30px;
  width: 30px;
  padding: 0;
  border-radius: 50%;
  background: rgba(10, 14, 20, .7);
  border-color: rgba(255,255,255,.15);
  font-size: 15px;
  display: grid;
  place-items: center;
  line-height: 1;
}
.fav-toggle { right: 6px; color: #cfd8e6; }
.fav-toggle.active { color: var(--warn); border-color: rgba(255,189,74,.6); }
.view-toggle { left: 6px; font-size: 16px; }
.select-check {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.55);
  background: rgba(10,14,20,.55);
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
  color: white;
}
.select-check.checked {
  background: var(--green);
  border-color: var(--green);
}
.thumb img, .preview-media img, .preview-media video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.meta { padding: 8px; min-width: 0; }
.name {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.size { color: var(--muted); font-size: 12px; margin-top: 4px; }

.preview {
  border-left: 1px solid var(--line);
  padding: 12px;
  min-width: 0;
}
.preview-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.preview-title {
  min-width: 0;
  flex: 1;
  font-weight: 700;
  overflow-wrap: anywhere;
}
.preview-media {
  height: 250px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #080d14;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.doc-frame {
  width: 100%;
  height: 100%;
  border: 0;
  background: white;
}
.doc-preview {
  padding: 16px;
  display: grid;
  gap: 8px;
  text-align: center;
  color: var(--muted);
}
.doc-preview strong {
  color: #cfe0ff;
  font-size: 38px;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
#favBtn.active { border-color: rgba(255,189,74,.6); color: var(--warn); }
.empty {
  color: var(--muted);
  padding: 18px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: grid;
  place-items: center;
  padding: 14px;
  z-index: 10;
}
.modal.hidden, .hidden { display: none; }
.dialog {
  width: min(760px, 100%);
  max-height: min(88vh, 720px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}
.admin-dialog {
  width: min(980px, 100%);
}
.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.dialog h2 { margin: 0; font-size: 20px; }
.admin-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.admin-tabs button {
  white-space: nowrap;
}
.admin-tabs button.active {
  background: #1e3358;
  border-color: var(--blue);
}
.admin-panel {
  display: none;
}
.admin-panel.active {
  display: block;
}
.admin-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}
.admin-stats div {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--panel-2);
}
.admin-stats strong {
  display: block;
  font-size: 22px;
}
.admin-stats span,
.admin-note {
  color: var(--muted);
  font-size: 13px;
}
.admin-block {
  margin-top: 12px;
}
.users { display: grid; gap: 8px; }
.user-row {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}
.user-actions { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.status { color: var(--muted); font-size: 12px; margin-top: 3px; }
.recovery-group {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  margin-bottom: 10px;
  overflow: hidden;
}
.recovery-group h3 {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}
.recovery-group h3 span {
  color: var(--muted);
  font-size: 13px;
}
.recovery-list {
  display: grid;
}
.recovery-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}
.recovery-row:last-child {
  border-bottom: 0;
}
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.warning-box {
  border-left: 4px solid var(--warn);
  background: #1c1720;
  padding: 12px;
  border-radius: var(--radius);
  margin-bottom: 10px;
}
.upload-queue {
  position: fixed;
  right: 14px;
  bottom: 14px;
  width: min(360px, calc(100vw - 28px));
  display: grid;
  gap: 8px;
  z-index: 12;
}
.upload-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.28);
}
.upload-item.done { border-color: rgba(33,199,119,.6); }
.upload-item.error { border-color: rgba(255,91,107,.7); }
.upload-line {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
}
.upload-line strong {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.upload-sub {
  color: var(--muted);
  font-size: 12px;
  margin-top: 5px;
}
.progress {
  height: 6px;
  background: #0a0f16;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 8px;
}
.progress i {
  display: block;
  height: 100%;
  background: var(--blue);
  border-radius: inherit;
  transition: width .15s ease;
}

.bulk-bar {
  position: fixed;
  left: 14px;
  right: 14px;
  bottom: 14px;
  z-index: 11;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
.bulk-info { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.bulk-actions { display: flex; flex-wrap: wrap; gap: 8px; }

.viewer {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: #04060a;
}
.viewer.hidden { display: none; }
.viewer-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.viewer-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.viewer-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.viewer-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: white;
}
.viewer-doc-loading { color: var(--muted); padding: 24px; text-align: center; max-width: 90%; }
.viewer-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  width: 42px;
  height: 42px;
  min-height: 42px;
  padding: 0;
  border-radius: 50%;
  background: rgba(20,26,36,.75);
  font-size: 18px;
  display: grid;
  place-items: center;
}
.viewer-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 46px;
  height: 46px;
  min-height: 46px;
  padding: 0;
  border-radius: 50%;
  background: rgba(20,26,36,.6);
  font-size: 26px;
  display: grid;
  place-items: center;
}
.viewer-prev { left: 12px; }
.viewer-next { right: 12px; }
.viewer-title {
  padding: 8px 14px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  overflow-wrap: anywhere;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.viewer-title-text { overflow-wrap: anywhere; }
.viewer-download-fallback {
  color: #8fb4ff;
  font-size: 12px;
  text-decoration: underline;
  white-space: nowrap;
}
.viewer-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--panel-2);
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.viewer-controls input[type="range"] { flex: 1; min-width: 100px; }
.viewer-time { color: var(--muted); font-size: 12px; white-space: nowrap; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 280px;
    z-index: 8;
    transform: translateX(-100%);
    transition: transform .18s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .preview {
    position: fixed;
    inset: 0;
    z-index: 7;
    border-left: 0;
    transform: translateY(100%);
    transition: transform .18s ease;
    overflow: auto;
  }
  .preview.open { transform: translateY(0); }
  .preview-media { height: 52vh; }
  .mobile-menu { display: block; }
  .topbar { display: flex; flex-wrap: wrap; }
  .topbar input#searchInput { flex: 1 1 100%; order: 1; }
  .topbar .mobile-menu { order: 0; }
  .topbar #selectModeBtn, .topbar #uploadBtn { order: 2; flex: 1; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); padding-bottom: 84px; }
  .thumb { height: 128px; }
  .split { grid-template-columns: 1fr; }
  .user-row { grid-template-columns: 1fr; }
  .recovery-row { grid-template-columns: 1fr; }
  .admin-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .user-actions { justify-content: flex-start; }
  .upload-queue {
    left: 10px;
    right: 10px;
    bottom: 10px;
    width: auto;
  }
  .bulk-bar { left: 10px; right: 10px; bottom: 10px; flex-direction: column; align-items: stretch; }
  .bulk-info { justify-content: space-between; }
  .bulk-actions { justify-content: flex-start; }
  .viewer-controls { gap: 6px; padding: 8px 10px; }
  .viewer-controls input[type="range"] { min-width: 70px; }
  .viewer-nav { width: 40px; height: 40px; min-height: 40px; font-size: 22px; }
}

@media (max-width: 380px) {
  .grid { grid-template-columns: 1fr; }
}

/* Admin → Cài đặt → Video: trường select có nhãn nằm trên dropdown. */
label.admin-field {
  display: block;
}
label.admin-field b {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
}
label.admin-field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #e3e5e9;
  border-radius: 8px;
  background: #fff;
  font-size: 14px;
}

/* ---- Music (Nhạc) ---- */
.hidden { display: none !important; }

.audio-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  height: 100%;
  padding: 24px;
}
.audio-note {
  font-size: 48px;
  opacity: 0.6;
}
.audio-preview audio { width: 100%; }

.viewer-audio-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  height: 100%;
}
.viewer-audio-note { font-size: 96px; opacity: 0.55; }
.viewer-audio-name { font-size: 18px; opacity: 0.85; text-align: center; padding: 0 20px; }

.viewer-volume {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.viewer-volume input[type="range"] { width: 70px; }

.music-search-dialog { max-width: 640px; width: 100%; }
.music-results {
  max-height: 55vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.music-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(127, 127, 127, 0.08);
}
.music-cover { width: 44px; height: 44px; border-radius: 6px; object-fit: cover; background: rgba(127,127,127,0.15); }
.music-cover-audio { display: grid; place-items: center; font-size: 24px; color: #8fb4ff; }
.music-info { flex: 1; min-width: 0; }
.music-name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.music-artist { font-size: 12px; opacity: 0.7; }
.music-license { margin-top: 3px; font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.music-license a { color: #8fb4ff; }
.music-nodl { font-size: 12px; opacity: 0.6; padding: 0 6px; white-space: nowrap; }
.music-empty { line-height: 1.55; }
.music-empty strong { color: var(--text); }
.music-source-link { color: #8fb4ff; text-decoration: underline; }


/* Mobile usability and non-blocking notifications */
.toast-tray { position: fixed; z-index: 1000; right: 16px; bottom: 16px; display: grid; gap: 8px; width: min(380px, calc(100vw - 32px)); pointer-events: none; }
.toast { opacity: 0; transform: translateY(8px); padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: #182131; box-shadow: 0 10px 30px rgba(0,0,0,.35); transition: opacity .22s ease, transform .22s ease; pointer-events: auto; }
.toast.show { opacity: 1; transform: translateY(0); }
.toast-error { border-color: rgba(255,91,107,.65); color: #ffd7dc; }
.media-hint { display: block; color: var(--muted); padding: 8px; }
@media (max-width: 860px) {
  .topbar { grid-template-columns: auto minmax(0, 1fr) auto; gap: 6px; padding: 8px; position: sticky; top: 0; z-index: 20; background: var(--bg); }
  .topbar #selectModeBtn { display: none; }
  .topbar #userSyncBtn { min-width: 38px; width: 38px; padding: 0; font-size: 0; }
  .topbar #userSyncBtn::before { content: '↻'; font-size: 20px; }
  .mobile-menu { display: inline-flex; align-items: center; justify-content: center; min-width: 82px; padding: 0 8px; }
  .sidebar { position: fixed; inset: 0 auto 0 0; z-index: 50; width: min(290px, 86vw); transform: translateX(-105%); transition: transform .2s ease; box-shadow: 12px 0 34px rgba(0,0,0,.38); }
  .sidebar.open { transform: translateX(0); }
  .sidebar.open::after { content: ''; position: fixed; inset: 0; left: 100%; width: calc(100vw - 100%); background: rgba(0,0,0,.45); pointer-events: none; }
  .filters { scrollbar-width: none; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(132px, 1fr)); padding: 8px; gap: 8px; }
  .upload-queue { left: 8px; right: 8px; width: auto; bottom: 8px; }
  .toast-tray { right: 8px; bottom: 8px; width: calc(100vw - 16px); }
}