/* ========== Reset & Base ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-surface: #0f3460;
  --bg-card: #1e2a4a;
  --bg-input: #0d1b3e;
  --text-primary: #e8e8e8;
  --text-secondary: #a0a8c0;
  --text-muted: #6b7290;
  --accent: #4fc3f7;
  --accent-hover: #29b6f6;
  --accent-dim: rgba(79, 195, 247, 0.15);
  --danger: #ef5350;
  --danger-hover: #e53935;
  --success: #66bb6a;
  --warning: #ffa726;
  --border: #2a3a5c;
  --border-light: #3a4a6e;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

html {
  font-size: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
}

/* ========== App Container ========== */
.app-container {
  width: 100%;
  max-width: 1100px;
  background: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ========== Toolbar ========== */
.toolbar {
  background: var(--bg-card);
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toolbar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.filename-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.filename-group label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  white-space: nowrap;
}

.filename-group input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  width: 150px;
  outline: none;
  transition: border var(--transition);
}

.filename-group input:focus {
  border-color: var(--accent);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-export {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-export:hover {
  background: #1a4a7a;
  border-color: var(--accent);
}

.btn-action {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  padding: 6px 12px;
}

.btn-action:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.btn-small {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  padding: 4px 8px;
  min-width: 32px;
}

.btn-small:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.btn-small:disabled,
.btn-action:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.controls-nav input[type="number"]:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ========== Main Content ========== */
.main-content {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0;
  min-height: 400px;
}

/* ========== Preview Section ========== */
.preview-section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: #0d1117;
  position: relative;
}

.preview-wrapper {
  position: relative;
  width: 640px;
  height: 360px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border), 0 8px 32px rgba(0, 0, 0, 0.4);
  background: #000;
}

#preview-canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  pointer-events: none;
}

.preview-placeholder p {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.preview-placeholder .sub {
  font-size: 0.85rem;
  opacity: 0.6;
}

.preview-placeholder.hidden {
  display: none;
}

/* ========== Controls Section ========== */
.controls-section {
  background: var(--bg-card);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-left: 1px solid var(--border);
}

.controls-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.controls-mode {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mode-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  width: 100%;
  margin-bottom: 2px;
}

.mode-radio {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.mode-radio:hover {
  background: var(--accent-dim);
}

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

.controls-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.controls-nav input[type="number"] {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  width: 50px;
  text-align: center;
  font-size: 0.85rem;
  outline: none;
  transition: border var(--transition);
}

.controls-nav input[type="number"]:focus {
  border-color: var(--accent);
}

/* Hide spinner for number inputs */
.controls-nav input[type="number"]::-webkit-inner-spin-button,
.controls-nav input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.controls-nav input[type="number"] {
  -moz-appearance: textfield;
}

/* Dimmed nav when in playback mode — visual only, buttons still clickable */
#param-nav.nav-disabled {
  opacity: 0.4;
}

/* Playback button */
.controls-playback {
  padding: 4px 0;
}

.btn-play {
  display: block;
  width: 100%;
  padding: 10px 16px;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-play:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* ========== Bottom Bar ========== */
.bottom-bar {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Timeline — AE/PR style frame thumbnails */
.timeline-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.timeline-zoom {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 2px;
}

.btn-icon {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 26px;
  height: 24px;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), border-color var(--transition);
}

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

.zoom-level {
  color: var(--text-secondary);
  font-size: 0.78rem;
  min-width: 36px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.timeline-track-wrap {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 80px;
  background: var(--bg-input);
  border-radius: 6px;
  border: 1px solid var(--border);
  padding: 0;
}

.timeline-ruler {
  position: sticky;
  top: 0;
  z-index: 3;
  height: 20px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  font-size: 0.65rem;
  color: var(--text-muted);
  overflow: hidden;
}

.timeline-track {
  display: flex;
  align-items: flex-start;
  padding: 6px 0 20px 0;
  min-height: 60px;
  position: relative;
}

.timeline-frame-item {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
  transition: opacity 0.15s ease;
}

.timeline-frame-item:hover {
  opacity: 0.85;
}

.timeline-frame-item.active-frame {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  z-index: 2;
}

.timeline-frame-item.selected-frame {
  box-shadow: 0 0 0 2px var(--success);
}

.timeline-frame-item img {
  display: block;
  border-radius: 2px;
  flex-shrink: 0;
}

.timeline-frame-gap {
  flex-shrink: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 1px;
  margin: 0 1px;
  align-self: center;
}

.timeline-frame-label {
  position: absolute;
  bottom: -13px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  color: var(--text-muted);
  white-space: nowrap;
  pointer-events: none;
}

/* Playhead */
.timeline-playhead {
  position: absolute;
  top: 20px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--accent);
  z-index: 5;
  pointer-events: none;
  transition: left 0.1s linear;
}

.timeline-playhead-line {
  position: absolute;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: var(--accent);
  z-index: 4;
  pointer-events: none;
  transition: left 0.1s linear;
}

.timeline-info {
  color: var(--text-muted);
  font-size: 0.78rem;
  white-space: nowrap;
  text-align: right;
  padding: 0 2px;
}

/* Parameter Bar */
.param-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  min-height: 38px;
}

.param-page.hidden {
  display: none;
}

.param-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.param-row label {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.param-row input[type="number"] {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 3px 6px;
  border-radius: 4px;
  width: 55px;
  font-size: 0.8rem;
  outline: none;
}

.param-row input[type="number"]:focus {
  border-color: var(--accent);
}

.param-row span {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.btn-param-apply {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 4px;
  padding: 4px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-param-apply:hover {
  background: var(--accent-hover);
}

/* Param tab active state */
.param-tab.active {
  background: var(--accent-dim) !important;
  border-color: var(--accent) !important;
}

/* Frame Info */
.frame-info {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.frame-info .sep {
  color: var(--border-light);
}

/* ========== Responsive ========== */
@media (max-width: 900px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .controls-section {
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .preview-wrapper {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .filename-group {
    margin-left: 0;
    width: 100%;
  }

  .filename-group input {
    flex: 1;
  }

  .toolbar-row {
    flex-direction: column;
    align-items: stretch;
  }

  .segment-section {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 8px;
  }

  .toolbar {
    padding: 12px;
  }

  .bottom-bar {
    padding: 12px;
  }

  .controls-buttons {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* ========== Utility ========== */
.hidden {
  display: none !important;
}