/* ============================================================================
   tess2-rust Demo — Clean Professional Theme
   ============================================================================ */

:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #e2e5ea;
  --border-light: #eef0f3;
  --text: #1a1d23;
  --text-secondary: #5a6170;
  --text-muted: #8b92a0;
  --accent: #1a7a5e;
  --accent-hover: #155f49;
  --accent-light: #f0faf5;
  --sidebar-width: 220px;
  --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);
  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: hidden;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

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

.tagline {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  padding: 8px 0 16px;
}

.nav-list > li > .nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  border-radius: 0;
  transition: background var(--transition), color var(--transition);
}

.nav-list > li > .nav-link:hover,
.nav-list > li > .nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-icon {
  font-size: 10px;
  opacity: 0.6;
  flex-shrink: 0;
}

.nav-group { }

.nav-section {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  transition: color var(--transition);
}

.nav-section::after {
  content: '›';
  font-size: 14px;
  transition: transform var(--transition);
  transform: rotate(90deg);
}

.nav-group.open .nav-section::after {
  transform: rotate(-90deg);
}

.nav-section:hover { color: var(--text-secondary); }

.nav-group-items {
  display: none;
  list-style: none;
}

.nav-group.open .nav-group-items { display: block; }

.nav-group-items .nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 20px 6px 32px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 12.5px;
  transition: background var(--transition), color var(--transition);
}

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

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.sidebar-footer p { margin-bottom: 4px; }
.sidebar-footer a { color: var(--accent); text-decoration: none; }
.sidebar-footer a:hover { text-decoration: underline; }
.sidebar-footer .license { margin-top: 8px; font-size: 10px; }

/* ============================================================================
   Main content
   ============================================================================ */

#main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  padding: 0;
}

.demo-page {
  padding: 32px;
  max-width: 1100px;
}

.demo-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.demo-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

/* ============================================================================
   Home page
   ============================================================================ */

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

.home-hero { margin-bottom: 48px; }

.home-hero h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 12px;
  color: var(--text);
}

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

.home-hero p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.home-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition), border-color var(--transition);
  display: block;
}

.home-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.home-card-icon {
  font-size: 28px;
  margin-bottom: 12px;
}

.home-card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

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

/* ============================================================================
   Canvas & controls
   ============================================================================ */

.canvas-wrapper {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: 12px;
}

.demo-canvas {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: block;
}

.canvas-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 16px;
}

.canvas-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.canvas-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
  align-items: center;
}

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

.control-group label { font-weight: 500; }

select, input[type="range"] {
  font-size: 13px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

select:focus, input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn {
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  transition: background var(--transition);
}

.btn:hover { background: var(--accent-hover); }
.btn-outline {
  background: none;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent-light); }

.stats-bar {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 8px;
}

/* ============================================================================
   Info boxes
   ============================================================================ */

.info-box {
  background: var(--accent-light);
  border: 1px solid rgba(26,122,94,0.2);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 700px;
}

.info-box strong { color: var(--text); }

/* ============================================================================
   Winding rule grid
   ============================================================================ */

.winding-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 16px;
}

@media (max-width: 900px) {
  .winding-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 600px) {
  .winding-grid { grid-template-columns: repeat(2, 1fr); }
}

.winding-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.winding-name {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.winding-tri-count {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================================================
   Interactive editor
   ============================================================================ */

.editor-layout {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.editor-canvas-wrapper { position: relative; }

#editor-canvas { cursor: crosshair; touch-action: none; }

.editor-sidebar {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.editor-instructions {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 14px 16px;
  background: var(--surface-alt);
  border-radius: var(--radius);
}

.editor-instructions kbd {
  display: inline-block;
  padding: 2px 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
}

.contour-list {
  list-style: none;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  max-height: 160px;
  overflow-y: auto;
  padding: 8px;
  background: var(--surface-alt);
  border-radius: var(--radius-sm);
}

/* ============================================================================
   Loading / error states
   ============================================================================ */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  font-size: 14px;
  color: var(--text-muted);
}

.error-box {
  background: #fff5f5;
  border: 1px solid #fcc;
  border-radius: var(--radius);
  padding: 16px 20px;
  color: #c53030;
  font-size: 13px;
}

/* ============================================================================
   Mobile
   ============================================================================ */

.menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 90;
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .sidebar-overlay.visible { display: block; }

  #sidebar {
    transform: translateX(-100%);
    transition: transform 250ms ease;
  }

  #sidebar.open { transform: translateX(0); }

  #main-content { margin-left: 0; }

  .demo-page { padding: 16px; }
  .home-page { padding: 24px 16px; }
  .home-hero h1 { font-size: 26px; }
  .winding-grid { grid-template-columns: repeat(2, 1fr); }
}