* {
  box-sizing: border-box;
}

:root {
  --bg-color: #050b14;
  --text-color: #eaf6ff;
  --text-muted: #a7bdd1;
  --text-dim: #6b8199;
  --panel-bg: rgba(8, 18, 28, 0.55);
  --panel-border: rgba(255, 255, 255, 0.1);
  --badge-bg: rgba(10, 22, 34, 0.6);
  --input-bg: rgba(255, 255, 255, 0.06);
  --input-border: rgba(255, 255, 255, 0.15);
  --card-bg: rgba(10, 22, 34, 0.7);
  --accent: #3b9dff;
  --accent-2: #34e89e;
}

:root[data-theme="light"] {
  --bg-color: #eef3f8;
  --text-color: #10202f;
  --text-muted: #4a6478;
  --text-dim: #6f8296;
  --panel-bg: rgba(255, 255, 255, 0.65);
  --panel-border: rgba(10, 30, 45, 0.1);
  --badge-bg: rgba(255, 255, 255, 0.7);
  --input-bg: rgba(10, 30, 45, 0.05);
  --input-border: rgba(10, 30, 45, 0.15);
  --card-bg: rgba(255, 255, 255, 0.75);
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-color) url('images/background.png') center / cover no-repeat fixed;
  color: var(--text-color);
  transition: background-color 0.2s ease, color 0.2s ease;
  padding-bottom: 3rem;
}

.hidden {
  display: none !important;
}

/* --- Top bar --- */
#topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  background: var(--badge-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--panel-border);
}

#back-link {
  background: var(--input-bg);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-color);
  text-decoration: none;
  flex: 0 0 auto;
}

#topbar-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  min-width: 0;
}

.logo-small {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  flex: 0 0 auto;
}

#topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

.icon-btn {
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--panel-border);
  height: 2.3rem;
  padding: 0 0.7rem;
  border-radius: 999px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  cursor: pointer;
}

@media (pointer: coarse) {
  .icon-btn {
    height: 44px;
  }
}

.icon-btn:hover {
  filter: brightness(1.1);
}

/* --- Layout --- */
#editor {
  max-width: 760px;
  margin: 0 auto;
  padding: 1rem 0.9rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

button {
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, #34e89e, #3b9dff);
  color: #04121c;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

button:disabled {
  opacity: 0.55;
  cursor: default;
  filter: none;
}

button.primary {
  padding: 0.5rem 1.1rem;
}

input {
  font-family: inherit;
  color: var(--text-color);
}

/* --- Drawing canvas --- */
#canvas-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: #fff;
  touch-action: none;
}

#onion-canvas, #draw-canvas, #playback-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

#onion-canvas {
  position: absolute;
  inset: 0;
  opacity: 0.28;
  pointer-events: none;
}

#draw-canvas {
  position: absolute;
  inset: 0;
}

#playback-overlay {
  position: absolute;
  inset: 0;
  background: #fff;
}

/* --- Toolbar rows --- */
#tool-row, #playback-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 0.6rem 0.7rem;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-color);
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
}

.tool-btn:hover {
  filter: brightness(1.12);
}

.tool-btn.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.tool-btn.danger {
  color: #ff6b6b;
  border-color: rgba(255, 107, 107, 0.4);
}

.size-label, .fps-label, .onion-label, .loop-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

#color-input {
  padding: 0.15rem;
  width: 2.4rem;
  height: 2.2rem;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
}

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

#fps-readout {
  min-width: 4.2em;
  font-variant-numeric: tabular-nums;
}

/* --- Frame strip --- */
#frame-row {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 0.6rem 0.7rem;
}

#frame-strip {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
  -webkit-overflow-scrolling: touch;
}

.frame-thumb {
  flex: 0 0 auto;
  width: 64px;
  height: 48px;
  border-radius: 6px;
  border: 2px solid var(--input-border);
  background: #fff;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  padding: 0;
}

.frame-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.frame-thumb.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.frame-thumb .frame-num {
  position: absolute;
  left: 2px;
  bottom: 2px;
  font-size: 0.6rem;
  font-weight: 700;
  color: #fff;
  background: rgba(0,0,0,0.55);
  border-radius: 4px;
  padding: 0 3px;
  line-height: 1.3;
}

#frame-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#frame-actions .tool-btn {
  flex: 1 1 auto;
}

/* --- Render / result --- */
.render-progress {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 0.9rem;
}

.progress-track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: rgba(127, 127, 127, 0.25);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, #34e89e, #3b9dff);
  transition: width 0.25s ease;
}

#render-status {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

#result-section {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

#result-section h2 {
  margin: 0;
  font-size: 1.05rem;
}

#result-gif {
  width: 100%;
  border-radius: 10px;
  background: #fff;
  max-height: 60vh;
  object-fit: contain;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.result-actions button {
  flex: 1 1 auto;
}