:root {
  --bg: #0d0d0d;
  --surface: #1a1a1a;
  --surface2: #242424;
  --border: #333;
  --accent: #00e5ff;
  --accent-dim: #00b8cc;
  --danger: #ff4d4d;
  --success: #4caf50;
  --text: #f0f0f0;
  --text-dim: #888;
  --radius: 14px;
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ──────────────────── LAYOUT ──────────────────── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
}

header {
  padding: 18px 20px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 50;
}

header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--accent);
  flex: 1;
}

#dataset-count {
  background: var(--accent);
  color: #000;
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  min-width: 28px;
  text-align: center;
}

/* ──────────────────── TABS ──────────────────── */
.tab-bar {
  display: flex;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: 12px 8px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ──────────────────── VIEWS ──────────────────── */
.view {
  display: none;
  flex: 1;
  padding: 20px;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
}

.view.active {
  display: flex;
}

/* ──────────────────── SECTIONS / CARDS ──────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.card-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 12px;
}

/* ──────────────────── TRICK SELECTOR ──────────────────── */
.trick-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.trick-btn {
  padding: 14px 10px;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform 0.1s;
  text-align: center;
}

.trick-btn:active {
  transform: scale(0.96);
}

.trick-btn.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface2));
  color: var(--accent);
}

/* ──────────────────── SENSOR DISPLAY ──────────────────── */
.sensor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.sensor-val {
  background: var(--surface2);
  border-radius: 8px;
  padding: 10px 8px;
  text-align: center;
}

.sensor-val .axis {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.sensor-val .val {
  font-size: 1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

/* ──────────────────── RECORD BUTTON ──────────────────── */
.record-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

#record-btn {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background var(--transition), transform 0.1s, box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  box-shadow: 0 0 0 0 var(--accent);
  user-select: none;
}

#record-btn .btn-icon {
  font-size: 2.2rem;
}

#record-btn:active {
  transform: scale(0.93);
}

#record-btn.recording {
  border-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 14%, transparent);
  color: var(--danger);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--danger) 60%, transparent); }
  70%  { box-shadow: 0 0 0 18px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

#timer-display {
  font-size: 1.8rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

#timer-display.recording {
  color: var(--danger);
}

#status-msg {
  font-size: 0.88rem;
  color: var(--text-dim);
  text-align: center;
}

/* ──────────────────── SENSOR PERMISSION BANNER ──────────────────── */
#permission-banner {
  background: color-mix(in srgb, #ff9800 15%, var(--surface));
  border: 1px solid #ff9800;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

#permission-banner.hidden {
  display: none;
}

#request-permission-btn {
  margin-left: auto;
  white-space: nowrap;
  padding: 7px 14px;
  background: #ff9800;
  color: #000;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  font-size: 0.82rem;
}

/* ──────────────────── REVIEW OVERLAY ──────────────────── */
#review-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

#review-overlay.hidden {
  display: none;
}

#review-sheet {
  background: var(--surface);
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 90dvh;
  overflow-y: auto;
  padding: 24px 20px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

#review-sheet h2 {
  font-size: 1.3rem;
  font-weight: 800;
}

#review-sheet h2 span {
  color: var(--accent);
}

.review-stats {
  display: flex;
  gap: 12px;
}

.stat-box {
  flex: 1;
  background: var(--surface2);
  border-radius: 10px;
  padding: 12px;
  text-align: center;
}

.stat-box .stat-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-box .stat-lbl {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-dim);
  margin-top: 2px;
}

#review-canvas {
  width: 100%;
  height: 140px;
  border-radius: 10px;
  background: var(--surface2);
  display: block;
}

.review-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.review-actions button {
  padding: 16px;
  border-radius: 12px;
  border: none;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.review-actions button:active {
  transform: scale(0.96);
  opacity: 0.85;
}

#btn-discard {
  background: var(--surface2);
  color: var(--danger);
  border: 2px solid var(--danger);
}

#btn-save {
  background: var(--success);
  color: #fff;
}

/* ──────────────────── DATASET VIEW ──────────────────── */
.dataset-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.dataset-header h2 {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 700;
}

.icon-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background var(--transition);
}

.icon-btn:hover {
  background: var(--border);
}

.icon-btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}

#dataset-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dataset-empty {
  text-align: center;
  color: var(--text-dim);
  padding: 40px 0;
  font-size: 0.95rem;
}

.recording-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.recording-item .trick-label {
  flex: 1;
}

.recording-item .trick-name {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
}

.recording-item .trick-meta {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.recording-item .item-delete {
  padding: 6px 10px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.8rem;
  transition: background var(--transition);
}

.recording-item .item-delete:hover {
  background: color-mix(in srgb, var(--danger) 15%, transparent);
}

/* ──────────────────── TRICK STATS PILLS ──────────────────── */
.trick-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.trick-stat-pill {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 12px;
  font-size: 0.8rem;
  color: var(--text);
}

.trick-stat-pill span {
  color: var(--accent);
  font-weight: 700;
}

/* ──────────────────── SCROLLBAR ──────────────────── */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: var(--surface);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* ──────────────────── TOAST ──────────────────── */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 22px;
  border-radius: 30px;
  font-size: 0.88rem;
  font-weight: 600;
  z-index: 200;
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: none;
  white-space: nowrap;
}

#toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ──────────────────── HEADER EXTRAS ──────────────────── */
.connected-as {
  font-size: 0.75rem;
  color: var(--text-dim);
  max-width: 90px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.settings-btn {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: background var(--transition);
}

.settings-btn:hover {
  background: var(--border);
}

/* ──────────────────── SETUP MODAL ──────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 110;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.hidden {
  display: none;
}

.modal-sheet {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 420px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-sheet h2 {
  font-size: 1.3rem;
  font-weight: 800;
}

.modal-desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal-field label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.modal-field input {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.95rem;
  padding: 11px 14px;
  outline: none;
  transition: border-color var(--transition);
  width: 100%;
}

.modal-field input:focus {
  border-color: var(--accent);
}

.setup-error {
  font-size: 0.82rem;
  color: var(--danger);
  min-height: 1.2em;
}

.modal-actions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 10px;
}

.modal-cancel-btn {
  padding: 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.modal-submit-btn {
  padding: 14px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #000;
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  transition: opacity var(--transition);
}

.modal-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ──────────────────── ADMIN PANEL ──────────────────── */
.admin-panel {
  margin-top: 4px;
}

.admin-panel.hidden {
  display: none;
}

.key-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.key-item:last-of-type {
  border-bottom: none;
}

.key-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.key-name {
  font-size: 0.92rem;
  font-weight: 600;
}

.admin-badge {
  background: var(--accent);
  color: #000;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 4px;
  padding: 1px 5px;
  margin-left: 4px;
  vertical-align: middle;
}

.key-preview {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: monospace;
}

.create-key-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.key-name-input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.9rem;
  padding: 9px 12px;
  outline: none;
}

.key-name-input:focus {
  border-color: var(--accent);
}

.key-revoke {
  padding: 6px 10px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.8rem;
  transition: background var(--transition);
}

.key-revoke:hover {
  background: color-mix(in srgb, var(--danger) 15%, transparent);
}

@media (min-width: 480px) {
  #app {
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }
}