*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:       #1e1e1e;
  --surface:  #2a2a2a;
  --elevated: #3a3a3a;
  --border:   #444444;
  --text:     #cccccc;
  --text-dim: #777777;
  --font-mono: "Consolas", "Menlo", "Monaco", monospace;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 10px;
  gap: 10px;
}

/* ── Header ─────────────────────────────────────────────── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
}

.title {
  color: var(--text-dim);
  letter-spacing: 0.08em;
  font-size: 12px;
}

#model-select {
  background: var(--elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  outline: none;
  min-width: 180px;
}

#model-select:focus {
  border-color: #666;
}

/* ── Main layout ─────────────────────────────────────────── */

#main {
  display: flex;
  flex: 1;
  gap: 12px;
  overflow: hidden;
}

/* ── Image panel ─────────────────────────────────────────── */

#image-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

#canvas {
  display: block;
  width: 384px;
  height: 384px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
}

#status {
  color: var(--text-dim);
  font-size: 11px;
  letter-spacing: 0.04em;
  min-height: 16px;
}

/* ── Slider panel ────────────────────────────────────────── */

#slider-panel {
  flex: 1;
  overflow-y: auto;
  padding-right: 4px;
}

/* custom scrollbar */
#slider-panel::-webkit-scrollbar {
  width: 4px;
}
#slider-panel::-webkit-scrollbar-track {
  background: var(--bg);
}
#slider-panel::-webkit-scrollbar-thumb {
  background: var(--elevated);
  border-radius: 2px;
}

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

.lock-btn {
  width: 18px;
  height: 18px;
  background: none;
  border: 1px solid var(--elevated);
  border-radius: 2px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.1s, color 0.1s;
  padding: 0;
  line-height: 1;
}

.lock-btn.locked {
  background: var(--elevated);
  color: var(--text);
  border-color: #666;
}

.slider-label {
  width: 28px;
  color: var(--text-dim);
  font-size: 11px;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

input[type="range"] {
  flex: 1;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: var(--elevated);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--text);
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.1s;
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--text);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]:hover::-webkit-slider-thumb {
  background: #ffffff;
}

input[type="range"]:hover::-moz-range-thumb {
  background: #ffffff;
}

/* ── Footer ──────────────────────────────────────────────── */

footer {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  padding: 4px 0;
  border-top: 1px solid var(--border);
}

footer button {
  background: var(--elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 6px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.1s;
  letter-spacing: 0.04em;
}

footer button:hover {
  background: #4a4a4a;
}

footer button:active {
  background: #555555;
}