/* ============================================================================
   Clipper2 Demo — Light Professional Theme
   ============================================================================ */

:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #e2e5ea;
  --border-light: #eef0f3;
  --text: #1a1d23;
  --text-secondary: #5a6170;
  --text-muted: #8b92a0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff4ff;
  --subject-fill: rgba(0, 180, 140, 0.15);
  --subject-stroke: #00b48c;
  --clip-fill: rgba(235, 68, 68, 0.15);
  --clip-stroke: #eb4444;
  --solution-fill: rgba(37, 99, 235, 0.20);
  --solution-stroke: #2563eb;
  --sidebar-width: 240px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --transition: 150ms ease;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================================
   Sidebar
   ============================================================================ */

#sidebar {
  width: var(--sidebar-width);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--border-light);
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.logo-accent {
  color: var(--accent);
}

.tagline {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-list {
  list-style: none;
  padding: 8px 8px;
  flex: 1;
}

.nav-section {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  padding: 16px 12px 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-link:hover {
  background: var(--surface-alt);
  color: var(--text);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-icon {
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-footer a {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-footer .license {
  margin-top: 4px;
  font-size: 10px;
}

/* ============================================================================
   Main Content
   ============================================================================ */

#main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
}

/* ============================================================================
   Home / Landing Page
   ============================================================================ */

.home-page {
  padding: 48px 40px;
  max-width: 1100px;
}

.github-badge {
  margin-bottom: 24px;
}

.github-badge-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #24292f;
  color: #ffffff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
  font-family: var(--font);
}

.github-badge-link:hover {
  background: #1b1f23;
}

.github-badge-link svg {
  flex-shrink: 0;
}

.hero {
  margin-bottom: 48px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1px;
  line-height: 1.1;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
  max-width: 600px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.feature-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.feature-card .card-icon {
  font-size: 24px;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.about-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.about-section h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-section p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
}

.about-section a {
  color: var(--accent);
  text-decoration: none;
}

.about-section a:hover {
  text-decoration: underline;
}

.stats-row {
  display: flex;
  gap: 32px;
  margin-top: 20px;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

/* ============================================================================
   Demo Page Layout
   ============================================================================ */

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

.demo-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.demo-header h2 {
  font-size: 18px;
  font-weight: 700;
}

.demo-header p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.demo-body {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.demo-canvas-area {
  flex: 1;
  position: relative;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-canvas-area canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.demo-controls {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
}

/* ============================================================================
   Controls
   ============================================================================ */

.control-group {
  margin-bottom: 16px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.control-group select,
.control-group input[type="range"] {
  width: 100%;
}

.control-group select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  outline: none;
  font-family: var(--font);
}

.control-group select:focus {
  border-color: var(--accent);
}

.control-group input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--surface);
  box-shadow: var(--shadow);
}

.slider-value {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: none;
  letter-spacing: 0;
}

.control-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.control-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}

.control-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.control-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.control-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.control-checkbox input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.control-separator {
  height: 1px;
  background: var(--border-light);
  margin: 16px 0;
}

.info-box {
  background: var(--accent-light);
  border: 1px solid #d0dcf5;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--accent);
  line-height: 1.5;
  margin-bottom: 16px;
}

.info-readout {
  background: var(--surface-alt);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.info-readout .label {
  color: var(--text-muted);
}

.info-readout .value {
  color: var(--text);
  font-weight: 600;
}

/* ============================================================================
   Source Code Panel
   ============================================================================ */

.code-panel {
  border-top: 1px solid var(--border);
  background: var(--surface);
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease;
}

.code-panel.open {
  max-height: 400px;
}

.code-panel-toggle {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 6px 24px;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
  z-index: 10;
}

.code-panel-toggle:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-light);
}

.code-tabs {
  display: flex;
  gap: 4px;
}

.code-tab {
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
  border: none;
  font-family: var(--font);
}

.code-tab.active {
  background: var(--accent-light);
  color: var(--accent);
}

.copy-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 11px;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--font);
}

.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.code-content {
  padding: 16px 24px;
  overflow: auto;
  max-height: 340px;
}

.code-content pre {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
  tab-size: 4;
}

/* Syntax highlighting */
.code-content .kw { color: #7c3aed; font-weight: 600; }
.code-content .ty { color: #0369a1; }
.code-content .fn { color: #c2410c; }
.code-content .str { color: #15803d; }
.code-content .num { color: #b45309; }
.code-content .cmt { color: #9ca3af; font-style: italic; }
.code-content .mac { color: #7c3aed; }

/* ============================================================================
   Canvas Overlay Info
   ============================================================================ */

.canvas-info {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  pointer-events: none;
  box-shadow: var(--shadow);
}

.canvas-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  font-size: 11px;
  color: var(--text-muted);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: var(--shadow);
}

/* ============================================================================
   Fill rules 2x2 grid
   ============================================================================ */

.fill-rules-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  flex: 1;
  min-height: 0;
  gap: 1px;
  background: var(--border);
}

.fill-rule-cell {
  background: var(--surface);
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.fill-rule-cell .cell-label {
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-light);
}

.fill-rule-cell canvas {
  flex: 1;
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================================================
   Simplify side-by-side
   ============================================================================ */

.simplify-split {
  display: flex;
  flex: 1;
}

.simplify-panel {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
}

.simplify-panel + .simplify-panel {
  border-left: 1px solid var(--border);
}

.panel-header {
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
}

.panel-header .count {
  font-weight: 400;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================================================
   PolyTree tree view
   ============================================================================ */

.polytree-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.tree-panel {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
}

.tree-node {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition);
}

.tree-node:hover {
  background: var(--surface-alt);
}

.tree-node.selected {
  background: var(--accent-light);
  color: var(--accent);
}

.tree-node .depth-indent {
  display: inline-block;
}

.tree-node .node-icon {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

/* ============================================================================
   Scrollbar
   ============================================================================ */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }