:root {
  color-scheme: only light;
  --page-bg: #ece7e0;
  --sidebar-bg: rgba(247, 244, 240, 0.94);
  --sidebar-border: #d8d0c6;
  --text-color: #2f2924;
  --muted-text: #746a61;
  --button-bg: #fffaf4;
  --button-hover: #efe4d6;
  --button-border: #d7cabb;
  --input-bg: #fffdf9;
  --preview-bg: #ffffff;
  --viewer-bg: radial-gradient(circle at top, #faf6ef 0%, #e4ddd4 100%);
  --focus-ring: rgba(144, 102, 64, 0.22);
  --shadow: 0 18px 40px rgba(86, 69, 51, 0.12);
  --toggle-track: #d5c3b1;
  --toggle-thumb: #fff8ef;
}

html[data-theme="dark"] {
  color-scheme: only dark;
  --page-bg: #171311;
  --sidebar-bg: rgba(29, 23, 20, 0.94);
  --sidebar-border: #40342c;
  --text-color: #f3ede7;
  --muted-text: #baaea3;
  --button-bg: #2b241f;
  --button-hover: #3a3029;
  --button-border: #4f433a;
  --input-bg: #241c18;
  --preview-bg: #2a231e;
  --viewer-bg: radial-gradient(circle at top, #2c2622 0%, #14110f 100%);
  --focus-ring: rgba(214, 178, 140, 0.28);
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.34);
  --toggle-track: #685647;
  --toggle-thumb: #fff2df;
}

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

body {
  background: var(--page-bg);
  color: var(--text-color);
  font-family: 'PingFang SC', 'Noto Sans SC', sans-serif;
  transition: background 0.25s ease, color 0.25s ease;
}

button,
input {
  font: inherit;
}

hr {
  border: 0;
  border-top: 1px solid var(--sidebar-border);
  margin: 16px 0;
}

#app {
  display: flex;
  width: 100%;
  height: 100%;
}

#sidebar {
  width: 400px;
  flex: none;
  background: var(--sidebar-bg);
  padding: 14px;
  box-sizing: border-box;
  border-right: 1px solid var(--sidebar-border);
  overflow-y: auto;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

#sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

#sidebar-brand {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-color);
  line-height: 1.1;
}

#sidebar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 64px;
  height: 32px;
  cursor: pointer;
  flex: none;
}

.theme-switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
}

.theme-slider {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 999px;
  background: var(--toggle-track);
  transition: background 0.25s ease, box-shadow 0.25s ease;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.theme-slider::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--toggle-thumb);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
  transition: transform 0.25s ease, background 0.25s ease;
}

.theme-switch input:checked + .theme-slider::after {
  transform: translateX(32px);
}

.theme-switch input:focus-visible + .theme-slider {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.theme-icon {
  position: absolute;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  color: rgba(255, 255, 255, 0.92);
  pointer-events: none;
}

.theme-icon svg {
  display: block;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-icon-sun {
  left: 8px;
}

.theme-icon-sun svg circle {
  fill: currentColor;
  stroke: none;
}

.theme-icon-moon {
  right: 8px;
}

.theme-icon-moon svg {
  fill: currentColor;
  stroke: none;
}

#github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--button-border);
  background: var(--button-bg);
  color: var(--text-color);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

#github-link:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

#github-link:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

#github-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.model-btns button,
.pattern-btn,
.paint-btn {
  border: 1px solid var(--button-border);
  border-radius: 10px;
  background: var(--button-bg);
  color: var(--text-color);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.model-btns button:hover,
.pattern-btn:hover,
.paint-btn:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

.model-btns button {
  width: 100%;
  margin-bottom: 10px;
  padding: 10px 12px;
  cursor: pointer;
}

.color-area {
  margin: 10px 0;
}

.color-area p,
.paint-area p,
.capacity-area p {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--text-color);
}

.color-btn {
  width: 30%;
  padding: 8px 0;
  margin: 0 1% 8px;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  color: white;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.color-btn[data-color="#6D5B54"] {
  background: #6d5b54;
}

.color-btn[data-color="#7A6963"] {
  background: #7a6963;
}

.color-btn[data-color="#5C6570"] {
  background: #5c6570;
}

.color-btn[data-color="#B85B46"] {
  background: #b85b46;
}

.color-btn[data-color="#C86B55"] {
  background: #c86b55;
}

.color-btn[data-color="#A95C50"] {
  background: #a95c50;
}

.color-btn[data-color="#C9B88F"] {
  background: #c9b88f;
}

.color-btn[data-color="#A8A08D"] {
  background: #a8a08d;
}

.color-btn[data-color="#B4A990"] {
  background: #b4a990;
}

.color-btn[data-color="#8A9A86"] {
  background: #8a9a86;
}

.color-btn[data-color="#6B7B6E"] {
  background: #6b7b6e;
}

.pattern-area,
.paint-area {
  margin-top: 10px;
}

.pattern-item,
.paint-item {
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pattern-btn,
.paint-btn {
  flex: 1;
  padding: 10px 12px;
  cursor: pointer;
}

.pattern-preview,
.paint-preview {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border: 1px solid var(--button-border);
  background: var(--preview-bg);
  border-radius: 10px;
  transition: background 0.25s ease, border-color 0.25s ease;
}

#viewer {
  flex: 1;
  background: var(--viewer-bg);
  transition: background 0.25s ease;
}

#viewer canvas {
  display: block;
}

.capacity-area {
  margin: 15px 0;
}

#capacity-input {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  border: 1px solid var(--button-border);
  border-radius: 10px;
  box-sizing: border-box;
  text-align: center;
  background: var(--input-bg);
  color: var(--text-color);
}

#capacity-input:focus {
  outline: none;
  border-color: var(--button-border);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

#capacity-display {
  margin-top: 8px;
  font-size: 32px;
  color: var(--muted-text);
  text-align: center;
  font-weight: 600;
}

.clear-btn-area {
  margin: 15px 0;
  text-align: center;
}

#clear-decal-btn {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  background: #c84e4f;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  transition: background 0.2s ease, transform 0.2s ease;
}

#clear-decal-btn:hover {
  background: #db6465;
  transform: translateY(-1px);
}