/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* 亮色主题 */
  --bg-primary: #f0f2f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f8f9fa;
  --bg-hover: #e9ecef;
  --text-primary: #1a1a2e;
  --text-secondary: #495057;
  --text-muted: #868e96;
  --border-color: #dee2e6;
  --border-light: #e9ecef;
  --accent: #4263eb;
  --accent-hover: #364fc7;
  --accent-light: #edf2ff;
  --success: #2f9e44;
  --warning: #f08c00;
  --danger: #e03131;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 10px;
  --radius-sm: 6px;
}

[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d28;
  --bg-tertiary: #232733;
  --bg-hover: #2a2f3d;
  --text-primary: #e8eaed;
  --text-secondary: #b8bcc4;
  --text-muted: #6c7184;
  --border-color: #2d3140;
  --border-light: #232733;
  --accent: #5c7cfa;
  --accent-hover: #748ffc;
  --accent-light: #1c2333;
  --success: #51cf66;
  --warning: #ffa94d;
  --danger: #ff6b6b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

html { font-size: 15px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ===== 顶部导航 ===== */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  height: 56px;
  flex-shrink: 0;
  z-index: 100;
}

.mobile-view-switch { display: none; }
.btn.mobile-print-btn { display: none; }

.header-inner {
  max-width: 100%;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  font-size: 1.3rem;
  color: var(--accent);
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

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

/* ===== 按钮 ===== */
.btn {
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-secondary {
  background: var(--success);
  color: #fff;
}
.btn-secondary:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.btn-ghost:hover:not(:disabled) { background: var(--bg-hover); color: var(--text-primary); }

.btn-icon {
  width: 30px;
  height: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.btn-icon:hover { background: var(--bg-hover); color: var(--text-primary); }

/* 主题切换图标 */
.theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: inline; }

/* ===== 主布局 ===== */
.app-main {
  display: flex;
  height: calc(100vh - 56px);
}

/* ===== 左侧控制面板 ===== */
.control-panel {
  width: 340px;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-section { display: flex; flex-direction: column; gap: 8px; }

.panel-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.panel-label .hint {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.text-input, .select-input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.text-input:focus, .select-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.word-textarea {
  width: 100%;
  min-height: 200px;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
  line-height: 1.7;
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.word-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.word-count {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0 2px;
}

.miss-count { color: var(--warning); }

/* 复选框/单选组 */
.info-toggles, .radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.toggle-item, .radio-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.toggle-item.full-toggle { width: 100%; }

.toggle-item input, .radio-item input {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
}

.toggle-item:hover, .radio-item:hover { color: var(--text-primary); }

/* 操作按钮组 */
.panel-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 4px;
}

/* 提示卡片 */
.panel-tip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: auto;
}

.tip-title {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.tip-list {
  list-style: none;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.tip-list li::before {
  content: "·";
  margin-right: 6px;
  color: var(--accent);
}

.tip-list code {
  background: var(--bg-hover);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.75rem;
  color: var(--accent);
}

/* ===== 右侧预览区 ===== */
.preview-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  min-width: 0;
}

.preview-toolbar {
  height: 44px;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.preview-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.preview-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}

.zoom-level {
  font-size: 0.78rem;
  color: var(--text-muted);
  min-width: 42px;
  text-align: center;
}

.preview-scroll {
  flex: 1;
  overflow: auto;
  padding: 30px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

/* 空状态 */
.preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
}

.empty-icon { font-size: 3.5rem; margin-bottom: 16px; opacity: 0.5; }
.empty-text { font-size: 1rem; font-weight: 500; margin-bottom: 6px; color: var(--text-secondary); }
.empty-sub { font-size: 0.85rem; }

/* ===== A4 容器 ===== */
.a4-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  transform-origin: top center;
  transition: transform 0.2s ease;
}

.a4-page {
  width: 210mm;
  height: 297mm;
  min-height: 297mm;
  max-height: 297mm;
  background: #ffffff;
  color: #1a1a1a;
  box-shadow: var(--shadow-lg);
  padding: 15mm 18mm 14mm 18mm;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  position: relative;
  overflow: hidden;
  font-family: "Times New Roman", "SimSun", serif;
}

/* 考试信息栏 */
.exam-header {
  border-bottom: 2px solid #333;
  padding-bottom: 10px;
  margin-bottom: 14px;
}

.exam-title {
  text-align: center;
  font-size: 20pt;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  font-family: "SimHei", "Heiti SC", sans-serif;
}

.exam-info {
  display: flex;
  justify-content: space-around;
  align-items: center;
  font-size: 11pt;
  font-family: "SimSun", "Songti SC", serif;
}

.info-field {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
}

.info-label { font-weight: 600; }

.info-blank {
  display: inline-block;
  border-bottom: 1px solid #555;
  min-width: 80px;
  height: 1.4em;
}

/* 说明行 */
.exam-instruction {
  font-size: 10pt;
  color: #555;
  margin-bottom: 10px;
  font-family: "SimSun", serif;
  padding: 4px 8px;
  background: #f8f8f8;
  border-left: 3px solid #888;
}

/* 单词网格区 - 多列布局 */
.word-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols, 3), minmax(0, 1fr));
  grid-template-rows: repeat(var(--grid-rows, 12), minmax(0, 1fr));
  grid-auto-flow: row;
  column-gap: 0;
  row-gap: 2mm;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

/* 行数越少，单词组之间可以留出更明显的呼吸空间 */
.word-grid.rows-8 { row-gap: 3mm; }
.word-grid.rows-10 { row-gap: 2.5mm; }
.word-grid.rows-12 { row-gap: 2mm; }
.word-grid.rows-15 { row-gap: 1.5mm; }
.word-grid.rows-18 { row-gap: 1mm; }

.word-cell {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: 0 3mm;
  border-right: 1px dashed #b0b0b0;
  display: flex;
  flex-direction: column;
  page-break-inside: avoid;
  break-inside: avoid;
}

/* 移除最后一列的右边框 */
.word-grid.cols-3 .word-cell:nth-child(3n) { border-right: none; }
.word-grid.cols-2 .word-cell:nth-child(2n) { border-right: none; }
.word-grid.cols-4 .word-cell:nth-child(4n) { border-right: none; }
.word-grid.cols-1 .word-cell { border-right: none; }

/* 单词头部：题号 + 释义 */
.cell-header {
  height: clamp(4mm, 23%, 6mm);
  min-height: 4mm;
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
  font-size: 10pt;
  font-weight: 500;
  color: #222;
  line-height: 1.05;
  font-family: "SimSun", "Songti SC", serif;
  word-break: break-word;
  padding-top: 0;
}

.cell-header .num {
  color: #555;
  margin-right: 3px;
  font-family: "Times New Roman", serif;
}

.cell-header.unknown { color: #c0392b; font-style: italic; }

/* 书写横线 - 自适应分配剩余空间 */
.write-line {
  flex: 1 1 0;
  border-bottom: 1px solid #555;
  min-height: 0;
}

/* 中文释义与第一条线属于同一组，距离应小于组内线距 */
.cell-header + .write-line {
  flex-grow: 0.45;
}

/* 页码 */
.page-footer {
  text-align: center;
  font-size: 9pt;
  color: #888;
  padding-top: 8px;
  margin-top: auto;
  font-family: "SimSun", serif;
}

/* ===== 打印样式 ===== */
@media print {
  @page {
    size: A4;
    margin: 3mm;
  }

  body {
    background: #fff !important;
    color: #000 !important;
    height: auto !important;
    overflow: visible !important;
  }

  .app-header, .mobile-view-switch, .control-panel, .preview-toolbar, .preview-empty {
    display: none !important;
  }

  .app-main {
    display: block !important;
    height: auto !important;
    min-height: 0 !important;
  }

  .preview-area {
    display: block !important;
    background: #fff !important;
    min-height: 0 !important;
  }

  .preview-scroll {
    overflow: visible !important;
    padding: 0 !important;
    display: block !important;
    min-height: 0 !important;
  }

  .a4-container {
    transform: none !important;
    zoom: 1 !important;
    gap: 0 !important;
    display: block !important;
  }

  .a4-page {
    box-shadow: none !important;
    width: 203mm !important;
    height: 276mm !important;
    min-height: 276mm !important;
    max-height: 276mm !important;
    overflow: hidden !important;
    page-break-after: auto !important;
    break-after: auto !important;
  }

}

/* ===== 滚动条 ===== */
.control-panel::-webkit-scrollbar,
.preview-scroll::-webkit-scrollbar {
  width: 8px;
}
.control-panel::-webkit-scrollbar-track,
.preview-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.control-panel::-webkit-scrollbar-thumb,
.preview-scroll::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
.control-panel::-webkit-scrollbar-thumb:hover,
.preview-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  body {
    height: auto;
    min-height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
  }

  .app-header {
    position: sticky;
    top: 0;
    height: 52px;
  }

  .header-inner { padding: 0 16px; }
  .brand { gap: 8px; }
  .brand-title { font-size: 0.98rem; }

  .mobile-view-switch {
    position: sticky;
    top: 52px;
    z-index: 90;
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 46px;
    padding: 6px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
  }

  .mobile-view-btn {
    border: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font: inherit;
    font-size: 0.86rem;
    font-weight: 600;
    cursor: pointer;
  }

  .mobile-view-btn.is-active {
    background: var(--accent-light);
    color: var(--accent);
  }

  .mobile-view-btn:disabled { opacity: 0.4; cursor: not-allowed; }

  .app-main {
    display: block;
    height: auto;
    min-height: calc(100vh - 98px);
  }

  .control-panel {
    width: 100%;
    border-right: none;
    border-bottom: 0;
    max-height: none;
    overflow: visible;
    padding: 16px;
    gap: 16px;
  }

  .panel-section { gap: 7px; }
  .word-textarea { min-height: 190px; }
  .btn { min-height: 44px; }
  .panel-actions #printBtn { display: none; }

  body[data-mobile-view="preview"] .control-panel { display: none; }
  body[data-mobile-view="editor"] .preview-area { display: none; }

  .preview-area {
    min-height: calc(100vh - 98px);
  }

  .preview-toolbar {
    height: 44px;
    padding: 0 12px;
    position: sticky;
    top: 98px;
    z-index: 20;
  }

  .preview-label { font-size: 0.76rem; }
  .preview-label { display: none; }
  .btn.mobile-print-btn {
    display: inline-flex;
    min-height: 32px;
    padding: 6px 12px;
    background: var(--success);
    color: #fff;
    font-size: 0.8rem;
  }
  .preview-scroll {
    min-height: calc(100vh - 142px);
    padding: 12px;
    overflow-x: hidden;
    align-items: flex-start;
  }

  .a4-container { margin: 0 auto; }
}