:root {
  color-scheme: dark;
  --bg: #101215;
  --panel: #161a20;
  --panel-2: #1c2128;
  --border: rgba(255, 255, 255, 0.1);
  --text: #edf1f7;
  --muted: #aeb7c6;
  --accent: #5fb3ff;
  --accent-2: #8bd3ff;
  --danger: #ff7f7f;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #08111a;
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-weight: 600;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button.icon-button {
  background: transparent;
  color: var(--muted);
  padding: 0.3rem 0.5rem;
}

input {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0d1014;
  color: var(--text);
  padding: 0.85rem 0.95rem;
}

label {
  display: grid;
  gap: 0.45rem;
}

label span,
.form-hint,
.tree-title,
.eyebrow,
.empty-state p,
.admin-sidebar p,
.panel-header p {
  color: var(--muted);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
}

.auth-shell,
.viewer-shell,
.admin-shell {
  min-height: 100vh;
}

.auth-shell {
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.auth-card {
  width: min(460px, 100%);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.stack-form {
  display: grid;
  gap: 1rem;
}

.wide {
  min-width: min(560px, calc(100vw - 2rem));
}

.form-error {
  color: var(--danger);
  margin: 0;
}

.admin-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
}

.admin-sidebar,
.viewer-sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 1.25rem;
}

.admin-sidebar {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.admin-panel {
  padding: 1.5rem;
}

.panel-header,
.player-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.group-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 1.5rem;
}

.group-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  display: grid;
  gap: 0.6rem;
}

.group-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: start;
}

.group-card h3,
.group-card p {
  margin: 0;
}

.badge-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.group-dialog {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  box-shadow: var(--shadow);
  padding: 0;
}

.group-dialog::backdrop {
  background: rgba(0, 0, 0, 0.56);
}

.group-dialog form {
  padding: 1rem;
}

.dialog-header,
.dialog-actions,
.checkbox-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.checkbox-row {
  justify-content: start;
}

.checkbox-row input {
  width: auto;
}

.viewer-shell {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
}

.viewer-sidebar {
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 1rem;
}

.viewer-lock,
.tree-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  padding: 0.9rem;
}

.tree-root {
  display: grid;
  gap: 0.3rem;
}

.tree-node {
  display: grid;
  gap: 0.25rem;
}

.tree-folder,
.tree-video {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 1px solid transparent;
  padding: 0.45rem 0.55rem;
}

.tree-folder {
  cursor: default;
}

.tree-folder-name {
  color: var(--muted);
  font-size: 0.9rem;
}

.tree-video:hover,
.tree-video.is-active {
  background: rgba(95, 179, 255, 0.12);
  border-color: rgba(95, 179, 255, 0.3);
}

.tree-children {
  display: grid;
  gap: 0.25rem;
  padding-left: 0.95rem;
  border-left: 1px solid var(--border);
}

.viewer-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.player-header {
  padding: 1.25rem 1.5rem 0.5rem;
}

.viewer-canvas-wrap {
  position: relative;
  min-height: min(72vh, 900px);
  margin: 1rem 1.5rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #05070a;
}

#viewer-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1.5rem;
}

.player-controls {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  display: grid;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(10, 12, 16, 0.86);
  backdrop-filter: blur(10px);
}

.progress-row,
.controls-row,
.controls-group,
.controls-group-right,
.volume-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.progress-row input,
.volume-control input {
  flex: 1;
}

.controls-row {
  justify-content: space-between;
  flex-wrap: wrap;
}

.controls-group,
.controls-group-right {
  flex-wrap: wrap;
}

.controls-group-right {
  margin-left: auto;
}

.volume-control {
  color: var(--muted);
  min-width: 220px;
}

.volume-control span,
.time-readout {
  font-size: 0.9rem;
  color: var(--muted);
}

input[type="range"] {
  accent-color: var(--accent);
}

@media (max-width: 980px) {
  .admin-shell,
  .viewer-shell {
    grid-template-columns: 1fr;
  }

  .admin-sidebar,
  .viewer-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .player-header {
    padding-top: 1rem;
  }

  .player-controls {
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
  }
}