:root, [data-bs-theme="light"] {
  --canvas-paper: #eef0eb;
  --canvas-fg: #121316;
  --canvas-grid: rgba(0, 0, 0, 0.08);
  --ruler-bg: #e2e5e0;
  --ruler-fg: #555555;
  --ruler-line: #b0b4ac;
  --app-bg: #f4f6f8;
  --card-bg: #ffffff;
  --border-color: rgba(0, 0, 0, 0.12);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
}

[data-bs-theme="dark"] {
  --canvas-paper: #22242a;
  --canvas-fg: #f0f2f5;
  --canvas-grid: rgba(255, 255, 255, 0.08);
  --ruler-bg: #1c1f26;
  --ruler-fg: #aaaaaa;
  --ruler-line: #333842;
  --app-bg: #0f1115;
  --card-bg: #161920;
  --border-color: rgba(255, 255, 255, 0.15);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--app-bg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  transition: background-color 0.3s ease;
}

.navbar-custom {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}
[data-bs-theme="dark"] .navbar-custom {
  background: rgba(22, 25, 32, 0.85);
}

.navbar .dropdown-menu {
  border: none !important;
}

.card-modern {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.canvas-container {
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  overflow-x: auto;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
  display: inline-block;
  max-width: 100%;
}

.editor-workspace {
  display: inline-grid;
  grid-template-columns: 24px auto;
  grid-template-rows: 24px auto;
  margin: 0 auto;
}

.ruler-corner {
  grid-column: 1;
  grid-row: 1;
  background: var(--ruler-bg);
  border-right: 1px solid var(--ruler-line);
  border-bottom: 1px solid var(--ruler-line);
  border-top-left-radius: 4px;
}

canvas#cv-ruler-top {
  grid-column: 2;
  grid-row: 1;
  background: var(--ruler-bg);
  cursor: ns-resize;
  border-bottom: 1px solid var(--ruler-line);
  display: block;
}

canvas#cv-ruler-left {
  grid-column: 1;
  grid-row: 2;
  background: var(--ruler-bg);
  cursor: ew-resize;
  border-right: 1px solid var(--ruler-line);
  display: block;
}

canvas#cv {
  grid-column: 2;
  grid-row: 2;
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  touch-action: none;
  cursor: crosshair;
  background: var(--canvas-paper);
  border-bottom-right-radius: 4px;
  box-shadow: var(--shadow-sm);
}

canvas#cv-preview {
  display: block;
  margin: 0 auto;
  image-rendering: pixelated;
  background: var(--canvas-paper);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.35rem;
}

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
}

.pattern-btn {
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  padding: 2px;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
}

.pattern-btn canvas {
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  border-radius: 3px;
}

.pattern-btn:hover, .pattern-btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  border-color: var(--bs-primary);
}

.pattern-btn.active {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.4);
}

.shift-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.25rem;
}

.tool-btn, .action-btn {
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--bs-body-color);
  padding: 0;
  font-size: 1.1rem;
  transition: all 0.15s ease-in-out;
}

.tool-btn:hover, .tool-btn:focus-visible,
.action-btn:hover, .action-btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  border-color: var(--bs-primary);
  color: var(--bs-primary);
  outline: none;
}

.tool-btn.active {
  background: var(--bs-primary);
  border-color: var(--bs-primary);
  color: #fff !important;
  box-shadow: 0 3px 8px rgba(13, 110, 253, 0.3);
}

.btn-soft {
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: all 0.15s ease;
}
.btn-soft:hover, .btn-soft:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.file-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.file-list-item:hover {
  background: rgba(13, 110, 253, 0.08);
  border-color: var(--border-color);
}
.file-list-item.active {
  background: rgba(13, 110, 253, 0.15);
  border-color: var(--bs-primary);
}
.file-thumb {
  width: 44px;
  height: 39px;
  image-rendering: pixelated;
  background: var(--canvas-paper);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  flex-shrink: 0;
}

#st {
  font-family: var(--bs-font-monospace);
  font-size: 0.85rem;
  letter-spacing: -0.02em;
}

.cursor-pointer {
  cursor: pointer;
}