:root {
  --bg-canvas: #ffffff;
  --bg-panel: #ffffff;
  --bg-panel-hover: #f5f5f9;
  --bg-button-hover: #ececf4;
  --bg-active: #e0dfff;
  --color-accent: #6965db;
  --color-accent-hover: #5d59ce;
  --color-danger: #e03131;
  --border-color: rgba(0, 0, 0, 0.09);
  --text-primary: #1e1e1e;
  --text-secondary: #6e6e7e;
  --shadow-dock: 0 4px 16px rgba(0, 0, 0, 0.08);
  --canvas-filter: none;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="dark"] {
  --bg-canvas: #121212;
  --bg-panel: #232329;
  --bg-panel-hover: #2e2d37;
  --bg-button-hover: #31303b;
  --bg-active: #403e6a;
  --color-accent: #a8a5ff;
  --color-accent-hover: #bbb8ff;
  --color-danger: #ff8787;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f0f0f4;
  --text-secondary: #9998a7;
  --shadow-dock: 0 4px 18px rgba(0, 0, 0, 0.35);
  --canvas-filter: invert(93%) hue-rotate(180deg);
}


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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  touch-action: none;
  overscroll-behavior: none;
  user-select: none;
  -webkit-user-select: none;
}

button { font-family: inherit; }
svg { pointer-events: none; }
.tool-btn svg, .option-btn svg, .dock-btn svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.option-btn svg { width: 16px; height: 16px; }
.dock-btn svg { width: 16px; height: 16px; }
svg.filled { fill: currentColor; stroke: none; }


#canvas-container {
  position: absolute; inset: 0;
  overflow: hidden;
  background-color: var(--bg-canvas);
}

#canvas {
  display: block;
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  cursor: default;
  filter: var(--canvas-filter);
}

#canvas.cursor-crosshair { cursor: crosshair; }
#canvas.cursor-grab { cursor: grab; }
#canvas.cursor-grabbing { cursor: grabbing; }
#canvas.cursor-move { cursor: move; }
#canvas.cursor-text { cursor: text; }
#canvas.cursor-nwse { cursor: nwse-resize; }
#canvas.cursor-nesw { cursor: nesw-resize; }
#canvas.cursor-ew { cursor: ew-resize; }
#canvas.cursor-ns { cursor: ns-resize; }
#canvas.cursor-pointer { cursor: pointer; }


#text-editor {
  display: none;
  position: absolute; top: 0; left: 0;
  min-width: 1em;
  padding: 0; margin: 0;
  border: 0;
  outline: 1px dashed #6965db;
  outline-offset: 4px;
  background: transparent;
  color: #1e1e1e;
  line-height: 1.25;
  resize: none;
  overflow: hidden;
  white-space: pre;
  z-index: 50;
  user-select: text; -webkit-user-select: text;
  caret-color: currentColor;
  filter: var(--canvas-filter);
  transform-origin: 0 0;
}
#text-editor.active { display: block; }
#text-editor.wrapped { white-space: pre-wrap; word-break: break-word; }


.site-link {
  position: fixed; top: 20px; left: 16px;
  z-index: 100;
  display: inline-flex; align-items: center;
  font: 500 11px/1 ui-monospace, Consolas, monospace;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 8px; border-radius: 6px;
}
.site-link:hover { color: var(--text-primary); background: var(--bg-button-hover); }
.site-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: #0B6E4F; margin-right: 0.5rem; }
[data-theme="dark"] .site-dot { background: #4ECF9E; }
@media (max-width: 768px) { .site-link { top: auto; bottom: 58px; left: 12px; } }

.build-info {
  margin: 0; padding: 10px 18px;
  border-top: 1px solid var(--border-color);
  font: 500 10.5px/1.5 ui-monospace, Consolas, monospace;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-secondary);
}


.top-toolbar {
  position: fixed; top: 12px; left: 50%;
  transform: translateX(-50%);
  z-index: 100;
}

.tool-dock {
  display: flex; align-items: center; gap: 2px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  border-radius: 10px;
  padding: 4px;
}

.tool-btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: transparent; border: none; border-radius: 7px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}
.tool-btn:hover { background: var(--bg-button-hover); }
.tool-btn.active { background: var(--bg-active); color: var(--color-accent); }
.tool-btn.locked { color: var(--color-accent); background: var(--bg-active); }

.tool-key {
  position: absolute; bottom: 2px; right: 4px;
  font-size: 8px; font-weight: 700;
  color: var(--text-secondary);
}
.tool-btn.active .tool-key { color: var(--color-accent); }

.tool-divider { width: 1px; height: 20px; background: var(--border-color); margin-inline: 3px; }


.properties-panel {
  position: fixed; top: 66px; left: 12px;
  width: 202px;
  max-height: calc(100vh - 140px);
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  border-radius: 10px;
  padding: 12px;
  z-index: 90;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 12px;
  scrollbar-width: thin;
}
.properties-panel[hidden] { display: none; }
.panel-section[hidden] { display: none; }
.properties-panel::-webkit-scrollbar { width: 4px; }
.properties-panel::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }

.panel-section { display: flex; flex-direction: column; gap: 6px; }

.panel-label {
  font-size: 10.5px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-secondary);
  display: flex; justify-content: space-between;
}
.panel-label-value { font-family: ui-monospace, monospace; text-transform: none; }

.color-palette { display: flex; align-items: center; flex-wrap: wrap; gap: 5px; }

.color-swatch {
  width: 22px; height: 22px;
  border-radius: 5px;
  border: 1px solid rgba(0, 0, 0, 0.15);
  cursor: pointer;
  position: relative;
  transition: transform 0.12s ease;
  filter: var(--canvas-filter);
}
.color-swatch:hover { transform: scale(1.12); }
.color-swatch.active { box-shadow: 0 0 0 1.5px var(--bg-canvas), 0 0 0 3px #6965db; }
.color-swatch.transparent { background: #fff; overflow: hidden; }
.transparent-slash {
  position: absolute; top: 50%; left: -20%;
  width: 140%; height: 2px;
  background: #e03131;
  transform: rotate(45deg);
}

.custom-color-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  border-radius: 5px;
  border: 1px dashed var(--text-secondary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.custom-color-btn.active { border-style: solid; box-shadow: 0 0 0 1.5px var(--bg-canvas), 0 0 0 3px #6965db; }
.custom-color-btn input[type="color"] { position: absolute; inset: 0; opacity: 0; width: 100%; height: 100%; cursor: pointer; }
.custom-color-preview {
  width: 12px; height: 12px; border-radius: 3px;
  background: conic-gradient(#e03131, #f08c00, #2f9e44, #1971c2, #9c36b5, #e03131);
  pointer-events: none;
  filter: var(--canvas-filter);
}
.custom-color-btn.active .custom-color-preview { width: 100%; height: 100%; border-radius: 4px; }

.button-group {
  display: flex; gap: 2px;
  background: var(--bg-panel-hover);
  border-radius: 7px;
  padding: 2px;
}

.option-btn {
  flex: 1;
  display: inline-flex; align-items: center; justify-content: center;
  height: 28px; min-width: 0;
  background: transparent; border: none; border-radius: 5px;
  color: var(--text-primary);
  font-size: 11px; font-weight: 600;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}
.option-btn:hover { background: var(--bg-button-hover); }
.option-btn.active { background: var(--bg-active); color: var(--color-accent); }
.option-btn.danger:hover { color: var(--color-danger); }
.option-btn:disabled { opacity: 0.35; cursor: default; }
.width-bar { width: 14px; background: currentColor; display: inline-block; border-radius: 2px; }
.font-sample { font-family: var(--font-ui); font-size: 13px; }
.arrowhead-row { display: flex; gap: 6px; }
.arrowhead-row .button-group { flex: 1; }

.range-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px;
  background: var(--bg-button-hover);
  border-radius: 4px;
  outline: none; cursor: pointer;
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--bg-panel);
  cursor: pointer;
}


.bottom-dock {
  position: fixed; bottom: 12px;
  z-index: 100;
  display: flex; align-items: center; gap: 2px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  border-radius: 10px;
  padding: 4px;
}
.bottom-left { left: 12px; }
.bottom-right { right: 12px; }
.dock-group { display: flex; align-items: center; gap: 2px; }

.dock-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: transparent; border: none; border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.12s ease;
}
.dock-btn:hover { background: var(--bg-button-hover); }
.dock-btn:disabled { opacity: 0.35; cursor: default; }
.dock-btn:disabled:hover { background: transparent; }
.dock-btn .dot { fill: currentColor; stroke: none; }
.dock-btn.active { background: var(--bg-active); color: var(--color-accent); }
.dock-btn.zoom-indicator {
  width: auto; min-width: 52px; padding-inline: 6px;
  font-size: 12px; font-weight: 600; font-family: ui-monospace, monospace;
}
.dock-divider { width: 1px; height: 18px; background: var(--border-color); margin-inline: 3px; }

[data-theme="light"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; }

.scroll-back {
  position: fixed; bottom: 60px; left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  padding: 8px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 12px; font-weight: 600;
  cursor: pointer;
}
.scroll-back[hidden] { display: none; }
.scroll-back:hover { background: var(--bg-button-hover); }


.context-menu {
  position: fixed;
  z-index: 250;
  list-style: none;
  min-width: 200px;
  padding: 4px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  border-radius: 8px;
  font-size: 13px;
}
.context-menu[hidden] { display: none; }
.context-menu li {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 7px 10px;
  border-radius: 5px;
  cursor: pointer;
}
.context-menu li:hover { background: var(--bg-button-hover); }
.context-menu li.danger:hover { color: var(--color-danger); }
.context-menu li.separator { height: 1px; padding: 0; margin: 4px 0; background: var(--border-color); cursor: default; }
.context-menu li.disabled { opacity: 0.4; pointer-events: none; }
.context-menu kbd { font-family: ui-monospace, monospace; font-size: 11px; color: var(--text-secondary); }


.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
}
.modal-backdrop[hidden] { display: none; }

.modal-card {
  width: 100%; max-width: 560px;
  display: flex; flex-direction: column;
  max-height: calc(100vh - 32px);
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}
.modal-header h2 { font-size: 15px; font-weight: 700; }
.modal-close-btn { background: transparent; border: none; font-size: 22px; line-height: 1; color: var(--text-secondary); cursor: pointer; }
.modal-close-btn:hover { color: var(--text-primary); }
.modal-card.wide { max-width: 760px; }
.modal-body { padding: 16px 18px; overflow-y: auto; min-height: 0; } 

.shortcuts-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px 22px; }
.shortcut-col { display: flex; flex-direction: column; gap: 14px; }
.shortcut-group h3 { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-secondary); margin-bottom: 6px; }
.shortcut-item { display: flex; align-items: center; gap: 4px; font-size: 12.5px; padding: 2px 0; }
.shortcut-item > span:first-child { flex: 1; color: var(--text-primary); }
.shortcut-item .muted { flex: none; color: var(--text-secondary); font-size: 11px; }
.shortcut-item kbd {
  display: inline-flex; align-items: center;
  padding: 2px 6px;
  background: var(--bg-button-hover);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: ui-monospace, monospace; font-size: 10.5px; font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.export-body { display: grid; grid-template-columns: 1fr 160px; gap: 16px; }
.export-preview-wrap {
  min-height: 200px;
  display: flex; align-items: center; justify-content: center;
  background-image: linear-gradient(45deg, rgba(128,128,128,0.15) 25%, transparent 25%, transparent 75%, rgba(128,128,128,0.15) 75%),
                    linear-gradient(45deg, rgba(128,128,128,0.15) 25%, transparent 25%, transparent 75%, rgba(128,128,128,0.15) 75%);
  background-size: 16px 16px; background-position: 0 0, 8px 8px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}
#export-preview { max-width: 100%; max-height: 320px; }
.export-options { display: flex; flex-direction: column; gap: 10px; font-size: 13px; }
.check { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.check input { accent-color: #6965db; }
.export-actions { grid-column: 1 / -1; display: flex; gap: 8px; flex-wrap: wrap; }
.primary-btn, .secondary-btn {
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 13px; font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-color);
}
.primary-btn { background: #6965db; color: #fff; border-color: #6965db; }
.primary-btn:hover { background: #5d59ce; }
.secondary-btn { background: var(--bg-panel-hover); color: var(--text-primary); }
.secondary-btn:hover { background: var(--bg-button-hover); }


.toast-notification {
  position: fixed; top: 64px; left: 50%;
  transform: translateX(-50%) translateY(-12px);
  background: var(--bg-panel);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dock);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 12.5px; font-weight: 600;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 300;
}
.toast-notification.show { opacity: 1; transform: translateX(-50%) translateY(0); }


@media (max-width: 768px) {
  .properties-panel { top: auto; bottom: 58px; left: 8px; right: 8px; width: auto; max-height: 38vh; }
  .shortcuts-grid { grid-template-columns: 1fr; }
  .modal-card.wide { max-width: 560px; }
  .export-body { grid-template-columns: 1fr; }
  .tool-key { display: none; }
  .tool-btn { width: 32px; height: 32px; }
}