:root {
  --ink: #18212f;
  --muted: #667085;
  --line: #d7dde7;
  --accent: #0f766e;
  --paper: #f7f8fb;
  --magenta: #ff00ff;
}

* {
  box-sizing: border-box;
}

body {
  color: var(--ink);
  background: linear-gradient(180deg, #fbfcfe 0%, #eef3f7 100%);
  min-height: 100vh;
}

@media (min-width: 1280px) {
  html,
  body {
    height: 100%;
    overflow: hidden;
  }
}

body.terms-locked {
  overflow: hidden;
}

canvas {
  image-rendering: pixelated;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
}

.tool-button {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font-size: 0.73rem;
  font-weight: 600;
  background: #ffffff;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, opacity 120ms ease;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.tool-button:hover {
  border-color: #9aa8bb;
  background: #f5f7fa;
}

.tool-button:active {
  transform: scale(0.97);
}

.tool-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.ai-compact-button {
  padding: 0.4rem 0.35rem;
  line-height: 1.2;
}

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

.tool-button.action-primary {
  border-color: #2563eb;
  color: #ffffff;
  background: #2563eb;
}

.tool-button.action-primary:hover {
  border-color: #1d4ed8;
  background: #1d4ed8;
}

.tool-button.action-success {
  border-color: #15803d;
  color: #ffffff;
  background: #15803d;
}

.tool-button.action-success:hover {
  border-color: #166534;
  background: #166534;
}

.tool-button.action-warning {
  border-color: #b45309;
  color: #ffffff;
  background: #b45309;
}

.tool-button.action-warning:hover {
  border-color: #92400e;
  background: #92400e;
}

.tool-button.action-danger {
  border-color: #be123c;
  color: #ffffff;
  background: #be123c;
}

.tool-button.action-danger:hover {
  border-color: #9f1239;
  background: #9f1239;
}

.tool-button.action-gif {
  border-color: #7c3aed;
  color: #ffffff;
  background: #7c3aed;
}

.tool-button.action-gif:hover {
  border-color: #6d28d9;
  background: #6d28d9;
}

.ro-magenta-chip {
  background: #ff00ff;
}

.checker {
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #dfe5ee 25%, transparent 25%),
    linear-gradient(-45deg, #dfe5ee 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #dfe5ee 75%),
    linear-gradient(-45deg, transparent 75%, #dfe5ee 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

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

.canvas-frame {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  overflow: hidden;
}

.source-crop-frame {
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 180px;
  margin-inline: auto;
}

.editor-canvas-frame {
  --editor-display-size: 480px;
  box-sizing: border-box;
  position: relative;
  width: calc(var(--editor-display-size) + 2px) !important;
  max-width: calc(var(--editor-display-size) + 2px) !important;
}

.editor-canvas-frame > canvas {
  width: var(--editor-display-size) !important;
  height: var(--editor-display-size) !important;
  max-width: 100%;
}

.editor-grid-overlay {
  display: none;
  pointer-events: none;
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(24, 33, 47, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(24, 33, 47, 0.22) 1px, transparent 1px);
  background-size: calc(var(--editor-display-size) / 24) calc(var(--editor-display-size) / 24);
  background-position: -1px -1px;
}

.editor-canvas-frame.grid-visible .editor-grid-overlay {
  display: block;
}

@media (min-width: 1280px) and (max-height: 880px) {
  .editor-canvas-frame {
    --editor-display-size: 480px;
  }
}

.scale-panel-tab {
  border-radius: 5px;
  padding: 4px 8px;
  color: #475569;
}

.scale-panel-tab.active {
  background: #0f766e;
  color: #ffffff;
}

.work-panel-scroll::-webkit-scrollbar {
  width: 8px;
}

.work-panel-scroll::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: #cbd5e1;
}

.work-panel-scroll::-webkit-scrollbar-track {
  background: transparent;
}

@media (min-width: 1280px) and (max-width: 1399px) {
  .source-panel {
    width: 250px !important;
  }

  .scale-panel {
    width: 215px !important;
  }

  .editor-column {
    width: 480px !important;
  }

  .side-panel {
    width: 230px !important;
  }

  .editor-canvas-frame {
    --editor-display-size: 432px;
  }

  .source-crop-frame {
    max-width: 132px;
  }
}

@media (min-width: 1400px) {
  .source-panel {
    width: 300px !important;
  }

  .scale-panel {
    width: 240px !important;
  }

  .editor-column {
    width: 520px !important;
  }

  .side-panel {
    width: 260px !important;
  }

  .editor-canvas-frame {
    --editor-display-size: 480px;
  }

  .source-crop-frame {
    max-width: 180px;
  }
}

@media (min-width: 1280px) and (max-height: 820px) {
  .editor-canvas-frame {
    --editor-display-size: 360px;
  }

  .source-crop-frame {
    max-width: 132px;
  }
}

.status {
  min-height: 1.5rem;
}

/* 最近使用色板 */
.recent-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.recent-color-swatch {
  width: 24px;
  height: 24px;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  transition: transform 80ms ease, border-color 80ms ease;
}

.recent-color-swatch:hover {
  transform: scale(1.18);
  border-color: var(--accent);
}

/* 縮放模式卡片 */
.scale-card {
  border: 2px solid var(--line);
  border-radius: 6px;
  padding: 6px;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, box-shadow 120ms ease;
  background: #fff;
}

.scale-card p {
  line-height: 1.25;
}

.scale-card p.mt-0\.5 {
  font-size: 0.68rem;
}

.scale-card:hover {
  border-color: #94a3b8;
  background: #f8fafc;
}

.scale-card.active {
  border-color: var(--accent);
  background: #f0fdfa;
  box-shadow: 0 0 0 1px var(--accent);
}

.scale-card-preview {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 3px;
  image-rendering: pixelated;
  flex-shrink: 0;
}

.scale-card-btn {
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 8px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 100ms;
}

.scale-card-btn:hover {
  background: #0d6459;
}

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

/* AI 冷卻 progress bar */
.cooldown-bar {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #e2e8f0;
  overflow: hidden;
}

.cooldown-bar-fill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #14b8a6);
  border-radius: 3px;
  transition: width 1s linear;
}

.ai-hint {
  border-left: 3px solid #0f766e;
  padding-left: 8px;
  line-height: 1.55;
}

/* 鍵盤快捷鍵提示 */
.kbd-hint {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: 700;
  color: #94a3b8;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  border-radius: 3px;
  padding: 0 4px;
  margin-left: 4px;
  line-height: 1.5;
  vertical-align: middle;
}

/* 拖放區域 */
.drop-zone-active {
  outline: 3px dashed var(--accent) !important;
  outline-offset: -3px;
  background: rgba(15, 118, 110, 0.05) !important;
}

/* 尺寸警告 */
.size-warning {
  background: #fffbeb;
  border: 1px solid #fbbf24;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #92400e;
  display: flex;
  align-items: center;
  gap: 6px;
}

.size-warning::before {
  content: '⚠';
  font-size: 1rem;
}

.terms-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(15, 23, 42, 0.72);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.terms-overlay.hidden {
  display: none;
}

.terms-dialog {
  width: min(920px, 100%);
  max-height: min(86vh, 760px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.38);
}

.terms-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px 14px;
  border-bottom: 1px solid var(--line);
}

.terms-content {
  overflow-y: auto;
  padding: 18px 22px;
  color: #334155;
  font-size: 0.875rem;
  line-height: 1.75;
}

.terms-content section + section {
  margin-top: 18px;
}

.terms-content h3 {
  margin: 0 0 6px;
  color: #0f172a;
  font-size: 0.95rem;
  font-weight: 800;
}

.terms-content p,
.terms-content ul {
  margin: 0;
}

.terms-content ul {
  padding-left: 1.15rem;
}

.terms-content li + li {
  margin-top: 4px;
}

.terms-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 22px 18px;
  border-top: 1px solid var(--line);
  background: #f8fafc;
}

.terms-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #334155;
  font-size: 0.875rem;
  font-weight: 700;
}

.terms-check input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.terms-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* =============================================================
   深色模式（方案 B：純中性灰 Zinc）
   切換方式：html.dark
   ============================================================= */

.dark {
  color-scheme: dark;
  --ink: #e4e4e7;
  --muted: #a1a1aa;
  --line: #3f3f46;
  --accent: #2dd4bf;
  --paper: #1c1c1e;
}

/* --- 全域底色 --- */
.dark body {
  color: var(--ink);
  background: linear-gradient(180deg, #18181b 0%, #1c1c1e 100%);
}

/* --- 表單元件 --- */
.dark input,
.dark select,
.dark textarea {
  color: var(--ink);
  background-color: #27272a;
  border-color: var(--line);
}

.dark input[type="color"] {
  background-color: transparent;
}

/* --- 面板 --- */
.dark .panel {
  background: rgba(28, 28, 30, 0.92);
}

/* --- 按鈕 --- */
.dark .tool-button {
  background: #27272a;
  border-color: var(--line);
  color: var(--ink);
}

.dark .tool-button:hover {
  border-color: #52525b;
  background: #3f3f46;
}

.dark .tool-button.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #18181b;
}

.dark .tool-button.action-primary {
  border-color: #3b82f6;
  background: #3b82f6;
  color: #ffffff;
}

.dark .tool-button.action-primary:hover {
  border-color: #60a5fa;
  background: #2563eb;
}

.dark .tool-button.action-success {
  border-color: #22c55e;
  background: #16a34a;
  color: #ffffff;
}

.dark .tool-button.action-success:hover {
  border-color: #4ade80;
  background: #22c55e;
}

.dark .tool-button.action-warning {
  border-color: #f59e0b;
  background: #d97706;
  color: #ffffff;
}

.dark .tool-button.action-warning:hover {
  border-color: #fbbf24;
  background: #f59e0b;
}

.dark .tool-button.action-danger {
  border-color: #f43f5e;
  background: #e11d48;
  color: #ffffff;
}

.dark .tool-button.action-danger:hover {
  border-color: #fb7185;
  background: #f43f5e;
}

.dark .tool-button.action-gif {
  border-color: #a78bfa;
  background: #7c3aed;
  color: #ffffff;
}

.dark .tool-button.action-gif:hover {
  border-color: #c4b5fd;
  background: #8b5cf6;
}

.dark .tool-button:disabled {
  opacity: 0.5;
}

.dark .tool-button.action-primary:disabled,
.dark .tool-button.action-success:disabled,
.dark .tool-button.action-warning:disabled,
.dark .tool-button.action-danger:disabled,
.dark .tool-button.action-gif:disabled {
  opacity: 1;
  animation: dark-btn-pulse 1.5s ease-in-out infinite;
}

@keyframes dark-btn-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

/* --- 棋盤格 --- */
.dark .checker {
  background-color: #27272a;
  background-image:
    linear-gradient(45deg, #1c1c1e 25%, transparent 25%),
    linear-gradient(-45deg, #1c1c1e 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1c1c1e 75%),
    linear-gradient(-45deg, transparent 75%, #1c1c1e 75%);
}

/* --- 畫布邊框 --- */
.dark .canvas-frame {
  background: #27272a;
}

/* --- 折疊區塊（details） --- */
.dark details {
  background: #27272a;
  border-color: var(--line);
}

/* --- 縮放模式卡片 --- */
.dark .scale-card {
  background: #27272a;
}

.dark .scale-card:hover {
  border-color: #52525b;
  background: #3f3f46;
}

.dark .scale-card.active {
  border-color: var(--accent);
  background: rgba(45, 212, 191, 0.08);
}

.dark .scale-card.active .scale-card-btn {
  background: #27272a;
  color: var(--accent);
}

.dark .scale-panel-tab {
  color: #d4d4d8;
}

.dark .scale-panel-tab.active {
  background: var(--accent);
  color: #18181b;
}

/* --- 冷卻條 --- */
.dark .cooldown-bar {
  background: #3f3f46;
}

.dark .cooldown-bar-fill {
  background: linear-gradient(90deg, var(--accent), #5eead4);
}

/* --- AI 提示線 --- */
.dark .ai-hint {
  border-left-color: var(--accent);
}

/* --- 鍵盤提示 --- */
.dark .kbd-hint {
  color: #71717a;
  background: #27272a;
  border-color: #3f3f46;
}

/* --- 最近色板 --- */
.dark .recent-color-swatch {
  border-color: var(--line);
}

/* --- 尺寸警告 --- */
.dark .size-warning {
  background: #422006;
  border-color: #92400e;
  color: #fbbf24;
}

/* --- 編輯器格線 --- */
.dark .editor-grid-overlay {
  background-image:
    linear-gradient(to right, #52525b 1px, transparent 1px),
    linear-gradient(to bottom, #52525b 1px, transparent 1px);
}

/* --- 捲軸 --- */
.dark .work-panel-scroll::-webkit-scrollbar-thumb {
  background: #52525b;
}

/* --- 拖放 --- */
.dark .drop-zone-active {
  background: rgba(45, 212, 191, 0.05) !important;
}

/* --- 條款彈窗 --- */
.dark .terms-overlay {
  background: rgba(0, 0, 0, 0.78);
}

.dark .terms-dialog {
  border-color: rgba(63, 63, 70, 0.9);
  background: #1c1c1e;
}

.dark .terms-content {
  color: #a1a1aa;
}

.dark .terms-content h3 {
  color: #e4e4e7;
}

.dark .terms-content a {
  color: var(--accent);
}

.dark .terms-footer {
  background: #18181b;
}

.dark .terms-check {
  color: #a1a1aa;
}

/* --- 切換按鈕 --- */
.dark-toggle {
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
  -webkit-user-select: none;
  user-select: none;
}

.dark-toggle:hover {
  background: #f5f7fa;
  border-color: #9aa8bb;
}

.dark .dark-toggle:hover {
  background: #3f3f46;
  border-color: #52525b;
}

/* =============================================================
   Tailwind 工具類暗色覆寫
   （使用 .dark 祖先選擇器的高權重覆蓋 Tailwind 單一 class）
   ============================================================= */

/* 文字色 */
.dark .text-slate-950 { color: #e4e4e7; }
.dark .text-slate-700 { color: #d4d4d8; }
.dark .text-slate-600 { color: #a1a1aa; }
.dark .text-slate-500 { color: #a1a1aa; }

/* 狀態/主題文字 */
.dark .text-teal-700 { color: #5eead4; }
.dark .text-teal-800 { color: #5eead4; }
.dark .text-violet-700 { color: #c4b5fd; }
.dark .text-violet-800 { color: #c4b5fd; }
.dark .text-amber-700 { color: #fcd34d; }
.dark .text-amber-800 { color: #fcd34d; }
.dark .text-rose-700 { color: #fda4af; }

/* 背景色 */
.dark .bg-white { background-color: #27272a; }
.dark .bg-slate-50 { background-color: #27272a; }
.dark .bg-slate-100 { background-color: #3f3f46; }

/* 邊框色 */
.dark .border-slate-200 { border-color: #3f3f46; }
.dark .border-slate-300 { border-color: #3f3f46; }
.dark .border-slate-400 { border-color: #52525b; }

/* Accent */
.dark .accent-teal-700 { accent-color: #2dd4bf; }