:root {
  --bg: #f0f0f0;
  --fg: #1e1e1e;
  --panel-bg: #ffffff;
  --border: #c8c8c8;
  --accent: #3670db;
  --danger: #d9534f;
  --input-bg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1e1e1e;
    --fg: #d4d4d4;
    --panel-bg: #262626;
    --border: #3a3a3a;
    --accent: #5b8def;
    --input-bg: #2f2f2f;
  }
}

/* Explicit theme override (AppSettings.theme = Light/Dark) takes precedence over prefers-color-scheme. */
:root[data-theme="light"] {
  --bg: #f0f0f0;
  --fg: #1e1e1e;
  --panel-bg: #ffffff;
  --border: #c8c8c8;
  --accent: #3670db;
  --input-bg: #ffffff;
}

:root[data-theme="dark"] {
  --bg: #1e1e1e;
  --fg: #d4d4d4;
  --panel-bg: #262626;
  --border: #3a3a3a;
  --accent: #5b8def;
  --input-bg: #2f2f2f;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: system-ui, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

body {
  display: grid;
  grid-template-rows: auto auto 1fr;
}

header.app-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

header.app-header h1 {
  font-size: 1rem;
  margin: 0;
}

header.app-header a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8rem;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.toolbar .sep {
  width: 1px;
  height: 1.4rem;
  background: var(--border);
  margin: 0 0.3rem;
}

.tool-group {
  display: flex;
  gap: 0.2rem;
}

button {
  font: inherit;
  color: inherit;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
}

button:hover {
  border-color: var(--accent);
}

button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

button.primary {
  background: var(--accent);
  color: #fff;
}

.tool-btn,
.icon-btn {
  min-width: 2rem;
  text-align: center;
}

.zoom-label {
  margin-left: auto;
  font-size: 0.85rem;
  opacity: 0.8;
  padding-right: 0.5rem;
}

.app-body {
  display: grid;
  grid-template-columns: 220px 1fr 260px;
  min-height: 0;
}

.canvas-area {
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

.canvas-area canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  image-rendering: pixelated;
}

.side-panel {
  overflow-y: auto;
  border-color: var(--border);
  background: var(--panel-bg);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.5rem;
}

.side-panel.left {
  border-right: 1px solid var(--border);
}

.side-panel.right {
  border-left: 1px solid var(--border);
}

.panel {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.4rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.layer-row,
.pen-row {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem;
  border-radius: 4px;
  cursor: pointer;
}

.layer-row.active,
.pen-row.active {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
}

.layer-icon-btn {
  min-width: 1.6rem;
  padding: 0.1rem 0.3rem;
}

.layer-icon-btn.danger,
.swatch-remove {
  color: var(--danger);
}

.layer-name {
  flex: 1;
  min-width: 0;
  background: var(--input-bg);
  color: inherit;
  border: 1px solid transparent;
  border-radius: 3px;
}

.layer-opacity {
  width: 3rem;
  background: var(--input-bg);
  color: inherit;
  border: 1px solid var(--border);
}

.ref-badge {
  font-size: 0.65rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 0.2rem;
}

.fgbg-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.fgbg-swatch {
  width: 2rem;
  height: 2rem;
  border-radius: 4px;
  padding: 0;
}

.fgbg-swatch.selected {
  outline: 2px solid var(--accent);
}

.hex-input,
input[type="text"],
input[type="number"],
select {
  background: var(--input-bg);
  color: inherit;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.15rem 0.3rem;
  width: 100%;
}

.sliders {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin: 0.4rem 0;
}

.slider-row {
  display: grid;
  grid-template-columns: 1.2rem 1fr 2.2rem;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
}

.slider-row input[type="range"] {
  width: 100%;
}

.swatch-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  margin-top: 0.3rem;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.25rem;
  margin: 0.3rem 0;
}

.swatch {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0;
}

.swatch-remove {
  position: absolute;
  top: -0.4rem;
  right: -0.4rem;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 1rem;
  height: 1rem;
  font-size: 0.65rem;
  line-height: 1rem;
  text-align: center;
}

.preset-row {
  display: flex;
  gap: 0.3rem;
  margin-top: 0.3rem;
}

.preset-row select {
  flex: 1;
}

.field-row {
  display: grid;
  grid-template-columns: 8rem 1fr;
  align-items: center;
  gap: 0.4rem;
  margin: 0.3rem 0;
}

.pen-editor .field-row {
  grid-template-columns: 7rem 1fr;
}

.app-dialog {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  background: var(--panel-bg);
  color: var(--fg);
  min-width: 20rem;
}

.app-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.app-dialog fieldset {
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.dialog-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 0.4rem;
  margin-top: 0.8rem;
}

.status-bar {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-top: 1px solid var(--border);
  opacity: 0.8;
}