:root {
  --bg: #14161c;
  --bg-elevated: #1c1f28;
  --bg-elevated-2: #242833;
  --border: #2e323f;
  --text: #e8e9ee;
  --text-dim: #9298a8;
  --accent: #4f8cff;
  --accent-hover: #6ba0ff;
  --danger: #e5555a;
  --danger-hover: #f16f74;
  --radius: 10px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  /* Safety net: nothing should ever be allowed to push the page wider than
     the screen and silently break the mobile viewport (it happened). */
  overflow-x: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 14px;
  background: var(--bg-elevated-2);
  color: var(--text);
  transition: background 0.15s;
}
button:hover { background: #2c313d; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

button.primary { background: var(--accent); color: white; }
button.primary:hover { background: var(--accent-hover); }
button.danger { background: transparent; color: var(--danger); }
button.danger:hover { background: rgba(229, 85, 90, 0.15); color: var(--danger-hover); }
button.ghost { background: transparent; color: var(--text-dim); }
button.ghost:hover { background: var(--bg-elevated-2); color: var(--text); }

input, select {
  font-family: inherit;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 9px 12px;
  font-size: 14px;
  outline: none;
}
input:focus, select:focus { border-color: var(--accent); }

/* ---------- Login page ---------- */
.login-page {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.login-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 32px;
  width: 100%;
  max-width: 360px;
}
.login-card h1 {
  font-size: 20px;
  margin: 0 0 4px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.login-card p.subtitle {
  color: var(--text-dim);
  margin: 0 0 24px;
  font-size: 13px;
}
.login-card form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.login-card label {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 4px;
  display: block;
}
.login-card button.primary {
  margin-top: 8px;
  padding: 10px;
}
.error-msg {
  color: var(--danger);
  font-size: 13px;
  min-height: 18px;
}

/* ---------- App shell ---------- */
.app {
  height: 100%;
  display: grid;
  grid-template-rows: auto auto 1fr;
}
/* Pinned explicitly so toggling .mobile-tabs' visibility (display:none on
   wide screens) never shifts which row the others land in via grid
   auto-placement — that's what let mobile-tabs collapse onto the 1fr row
   and push .layout off-screen below the fold. */
.topbar { grid-row: 1; }
.mobile-tabs { grid-row: 2; }
.layout { grid-row: 3; min-height: 0; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  row-gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.topbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  white-space: nowrap;
}
.topbar .brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.topbar .right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.topbar .username {
  color: var(--text-dim);
  font-size: 13px;
}
@media (max-width: 480px) {
  .topbar { padding: 8px 10px; }
  .topbar .brand { font-size: 14px; }
  .topbar .username { display: none; }
  .topbar .right { gap: 6px; }
  .topbar button.ghost { padding: 6px 9px; font-size: 12px; }
  .role-badge { padding: 2px 6px; font-size: 10px; }
}
.role-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-elevated-2);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.role-badge.admin { background: rgba(79, 140, 255, 0.18); color: var(--accent-hover); }

.layout {
  display: grid;
  grid-template-columns: 260px 300px 1fr 240px;
  min-height: 0;
}
@media (max-width: 1400px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar, .filelist, .viewer, .settings-panel { display: none; }
  .layout.show-sidebar .sidebar { display: block; }
  .layout.show-filelist .filelist { display: block; }
  .layout.show-viewer .viewer { display: block; }
  .layout.show-settings .settings-panel { display: block; }
}

.sidebar, .filelist {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
  background: var(--bg);
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.folder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  gap: 6px;
}
.folder-item:hover { background: var(--bg-elevated); }
.folder-item.active { background: var(--bg-elevated-2); color: var(--accent-hover); }
.folder-item .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.folder-item .count { color: var(--text-dim); font-size: 12px; }
.folder-actions { display: flex; gap: 4px; flex-shrink: 0; }
.folder-actions button { padding: 3px 7px; font-size: 11px; }
.folder-actions button.danger-icon { color: var(--danger); }
.folder-actions button.danger-icon:hover { background: rgba(229, 85, 90, 0.15); color: var(--danger-hover); }

.file-card {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 8px;
  cursor: pointer;
  background: var(--bg-elevated);
}
.file-card:hover { border-color: var(--accent); }
.file-card.active { border-color: var(--accent); background: var(--bg-elevated-2); }
.file-card .fname {
  font-size: 13px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-card .fmeta {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 3px;
  display: flex;
  justify-content: space-between;
}
.file-card .fbadges {
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--text-dim);
  flex-wrap: wrap;
}
.file-card .version-tag {
  background: var(--bg-elevated-2);
  border-radius: 999px;
  padding: 2px 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.file-card .rating-badge { display: inline-flex; align-items: center; gap: 3px; }
.file-card .rating-badge .star-icon { color: #f5b942; }
.file-card .versions-toggle { color: var(--accent-hover); cursor: pointer; }
.file-card .versions-toggle:hover { text-decoration: underline; }
.file-card .fcontrols {
  margin-top: 8px;
  display: flex;
  gap: 6px;
}
.file-card .fcontrols button { flex: 1; padding: 5px; font-size: 11px; }
.empty-hint { color: var(--text-dim); font-size: 13px; padding: 12px 4px; }

.viewer {
  position: relative;
  min-width: 0;
  background: radial-gradient(circle at 50% 40%, #1a1d26 0%, #101218 100%);
}
.viewer canvas { display: block; width: 100%; height: 100%; }
.viewer-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
  padding: 20px;
}
/* Info panel (left) and toolbar (right) share one flex row anchored to the
   top of the viewer, so they can never overlap: on wide screens they sit
   side by side, on narrow screens they stack (info on top, toolbar below,
   still right-aligned) with no manual/fragile offset math. The wrapper
   itself ignores pointer events so drags over the empty middle still reach
   the 3D canvas underneath; the two children opt back in. */
.viewer-overlay-top {
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  pointer-events: none;
}
.viewer-overlay-top > * { pointer-events: auto; }

.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  background: rgba(28, 31, 40, 0.85);
  backdrop-filter: blur(6px);
  padding: 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.viewer-toolbar button { padding: 6px 10px; font-size: 12px; }
.viewer-info {
  background: rgba(28, 31, 40, 0.9);
  backdrop-filter: blur(6px);
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 13px;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}
@media (max-width: 640px) {
  .viewer-overlay-top { flex-direction: column; align-items: stretch; right: 14px; }
  .viewer-info { max-width: 100%; }
  .viewer-toolbar { align-self: flex-end; }
}
.vi-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; position: relative; }
.vi-title { font-weight: 600; overflow-wrap: anywhere; }
button.ghost.small { padding: 3px 9px; font-size: 11px; }
button.ghost.small.validated { background: rgba(76, 175, 80, 0.18); color: #4caf50; }
.validated-badge { color: #4caf50; font-size: 13px; }
.comment-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.comment-box textarea {
  width: 100%;
  resize: vertical;
  font-family: inherit;
  background: var(--bg-elevated-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 12px;
  outline: none;
}
.comment-box textarea:focus { border-color: var(--accent); }
button.primary.small { padding: 4px 10px; font-size: 11px; }
.comment-status { font-size: 11px; color: var(--text-dim); }
.comments-admin-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}
.comment-row {
  background: var(--bg-elevated-2);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
}
.comment-row-head {
  display: flex;
  justify-content: space-between;
  color: var(--text-dim);
  font-size: 11px;
  margin-bottom: 3px;
}
.comment-row-head strong { color: var(--text); font-size: 12px; }
.comment-row-text { white-space: pre-wrap; overflow-wrap: anywhere; }
.version-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  min-width: 280px;
  max-height: 240px;
  overflow-y: auto;
  z-index: 10;
}
.version-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
}
.version-row:hover { background: var(--bg-elevated-2); }
.version-row.active { background: var(--bg-elevated-2); color: var(--accent-hover); }
.version-row .vr-meta { display: flex; align-items: center; gap: 6px; overflow: hidden; }
.version-row .vr-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.version-row .vr-date { color: var(--text-dim); font-size: 11px; flex-shrink: 0; }
.version-row button.danger { padding: 2px 6px; font-size: 10px; flex-shrink: 0; }
.viewer-hint {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(28, 31, 40, 0.85);
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
}
/* Deliberately low-key: an admin calibration tool, not a viewer feature —
   small, dim, tucked in a corner instead of sitting with the main toolbar. */
.orientation-tool {
  position: absolute;
  bottom: 14px;
  left: 14px;
}
.orientation-toggle {
  background: rgba(28, 31, 40, 0.7);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 10px;
  padding: 4px 8px;
  border-radius: 999px;
  opacity: 0.6;
}
.orientation-toggle:hover { opacity: 1; color: var(--text); }
.orientation-toggle:disabled { opacity: 0.25; cursor: not-allowed; }
.orientation-toggle:disabled:hover { color: var(--text-dim); }
.orientation-panel {
  position: absolute;
  bottom: 100%;
  left: 0;
  margin-bottom: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  width: 240px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.orientation-help {
  margin: 0;
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.4;
}
.orientation-grid-check {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
}

.loading-spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Settings panel (lighting / material) ---------- */
.settings-panel {
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 14px;
  background: var(--bg);
}
.setting-row {
  margin-bottom: 16px;
}
.setting-row label {
  display: block;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.setting-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}
.material-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.material-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  font-size: 11px;
  color: var(--text-dim);
}
.material-swatch:hover { border-color: var(--accent); color: var(--text); }
.material-swatch.active { border-color: var(--accent); background: var(--bg-elevated-2); color: var(--text); }
.swatch-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* ---------- Upload progress ---------- */
.upload-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--bg-elevated-2);
  overflow: hidden;
}
.upload-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.25s ease;
}
.upload-progress-label {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: -2px;
}

/* ---------- Upload form ---------- */
.upload-form {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.upload-form .row { display: flex; gap: 6px; }
.upload-form input[type="file"] { font-size: 12px; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 16px;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 22px;
}
.modal h2 {
  margin: 0 0 16px;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal h2 .close { cursor: pointer; color: var(--text-dim); font-size: 20px; }
.user-row-wrap { margin-bottom: 6px; }
.user-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--bg-elevated-2);
  font-size: 13px;
  flex-wrap: wrap;
}
.user-row .meta { display: flex; align-items: center; gap: 8px; }
.user-row-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.password-form {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 0;
  flex-wrap: wrap;
}
.password-form input { flex: 1; min-width: 140px; }
.pw-status { font-size: 11px; color: var(--text-dim); }
.new-user-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.new-user-form .row { display: flex; gap: 8px; }
.new-user-form .row input { flex: 1; }

.mobile-tabs {
  display: none;
  border-bottom: 1px solid var(--border);
}
@media (max-width: 1400px) {
  .mobile-tabs { display: flex; }
  .mobile-tabs button { flex: 1; border-radius: 0; background: var(--bg-elevated); font-size: 12px; padding: 10px 4px; }
  .mobile-tabs button.active { background: var(--bg-elevated-2); color: var(--accent-hover); }
}

/* Bigger touch targets for the small icon-only buttons once a mouse/hover
   isn't guaranteed to be available (touch phones/tablets, and narrow
   windows in general where taps are more likely than precise clicks). */
@media (max-width: 900px) {
  .folder-actions button { padding: 6px 10px; font-size: 13px; }
  .version-row { padding: 10px 8px; }
  .version-row button.danger { padding: 6px 10px; font-size: 12px; }
  .stars button { font-size: 20px; }
  .file-card .fcontrols button { padding: 8px 5px; }
}