/* Vercel-inspired light mode */
:root {
  --bg: #ffffff;
  --bg-secondary: #fafafa;
  --border: #eaeaea;
  --border-hover: #e5e5e5;
  --text: #171717;
  --text-muted: #737373;
  --accent: #000000;
  --accent-hover: #404040;
  --tool-active-bg: #000000;
  --tool-active-fg: #ffffff;
  --canvas-bg: #ffffff;
  --selection: #0070f3;
  --selection-light: rgba(0, 112, 243, 0.1);
}

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

body {
  font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: relative;
  z-index: 20;
}

.toolbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  pointer-events: none;
}

.tool-group {
  display: flex;
  gap: 4px;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 0;
}

.tool-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
}

.tool-btn.active {
  background: var(--tool-active-bg);
  border-color: var(--tool-active-bg);
  color: var(--tool-active-fg);
}

.tool-btn .bi,
.tool-btn .tool-icon-line {
  font-size: 18px;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: block;
  margin: 0 auto;
}

.tool-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Vercel-style export button */
.btn-export {
  flex-shrink: 0;
  margin-left: auto;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  padding: 8px 14px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease;
}

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

.workspace {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  margin-right: 375px;
  background: var(--bg-secondary);
  min-width: 0;
  overflow: auto;
}

.canvas-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.canvas-container {
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  display: flex;
  align-items: center;
  justify-content: center;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.github-link .bi {
  font-size: 14px;
}

.github-link:hover {
  color: var(--text);
}

#canvas {
  display: block;
  cursor: crosshair;
}

#canvas.tool-select {
  cursor: default;
}

#canvas.tool-select.over-segment {
  cursor: default;
}

#canvas.tool-paintbucket {
  cursor: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path fill="%23000" d="M19 11H5a2 2 0 0 0-2 2v6a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-6a2 2 0 0 0-2-2z"/><path fill="%23fff" d="M12 3v6M9 6h6" stroke="%23000" stroke-width="1"/></svg>') 12 12, pointer;
}

.properties-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 375px;
  height: 100vh;
  padding: 16px;
  padding-top: 92px;
  background: var(--bg);
  border-left: 1px solid var(--border);
  font-size: 13px;
  overflow-y: auto;
  z-index: 10;
}

.properties-panel .panel-section {
  margin-bottom: 16px;
  position: relative;
}

.panel-about {
  padding-left: 0;
  padding-right: 0;
}

.about-box {
  padding: 12px 14px;
  border-radius: 6px;
  border-left: 4px solid;
  margin-bottom: 12px;
}

.about-box:last-child {
  margin-bottom: 0;
}

.about-box-warning {
  background-color: #fff3cd;
  border-left-color: #ffc107;
}

.about-box-info {
  background-color: #cfe2ff;
  border-left-color: #0d6efd;
}

.panel-about .about-intro,
.panel-about .about-shortcuts {
  line-height: 1.5;
  margin: 0;
}

.panel-about .about-intro {
  font-size: 15px;
}

.panel-about .about-shortcuts {
  font-size: 14px;
}

.panel-about .about-intro {
  color: #664d03;
}

.panel-about .about-shortcuts {
  color: #084298;
}

.properties-panel .panel-section label {
  display: block;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.properties-panel .panel-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: nowrap;
  min-width: 0;
}

.properties-panel .panel-row-slider .panel-label {
  flex-shrink: 0;
}

.properties-panel .panel-label {
  min-width: 48px;
  color: var(--text-muted);
}

.properties-panel input[type="number"],
.properties-panel select {
  width: 70px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}

.slider-with-value {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.properties-panel input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border-radius: 3px;
  --slider-pct: 4%;
}

/* Webkit: Vercel-style filled track (blue left, gray right) */
.properties-panel input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: linear-gradient(to right, var(--accent) 0, var(--accent) var(--slider-pct), var(--border) var(--slider-pct), var(--border) 100%);
  border-radius: 3px;
}

.properties-panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  margin-top: -4px;
}

/* Moz: Vercel-style filled track */
.properties-panel input[type="range"]::-moz-range-track {
  height: 6px;
  background: linear-gradient(to right, var(--accent) 0, var(--accent) var(--slider-pct), var(--border) var(--slider-pct), var(--border) 100%);
  border-radius: 3px;
}

.properties-panel input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.slider-value {
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 32px;
  text-align: right;
  color: var(--text);
}

.color-swatch {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  padding: 0;
}

.color-popover {
  display: none;
  position: absolute;
  top: 100%;
  left: 16px;
  margin-top: 4px;
  padding: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 100;
}

.color-popover.visible {
  display: block;
}

.fill-section,
.fill-edit-section,
.fill-bucket-section {
  position: relative;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
}

.color-grid button {
  width: 24px;
  height: 24px;
  border: 1px solid rgba(0,0,0,0.15);
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
}

.color-grid button:hover {
  transform: scale(1.1);
}