/* 人工智能训练师三级刷题系统 - 样式表 */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  
  --success-color: #10b981;
  --success-light: #ecfdf5;
  --success-border: #a7f3d0;
  
  --danger-color: #ef4444;
  --danger-light: #fef2f2;
  --danger-border: #fecaca;
  
  --warning-color: #f59e0b;
  --warning-light: #fffbeb;
  
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  
  --text-main: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --font-size-base: 16px;
}

/* 护眼模式 (Eye Care) */
body.theme-eyecare {
  --bg-main: #f4f6e8;
  --bg-card: #fafbf2;
  --bg-subtle: #e9ece0;
  --text-main: #2d3e2f;
  --text-secondary: #586e5b;
  --border-color: #d8dfcd;
  --primary-color: #2e7d32;
  --primary-hover: #1b5e20;
  --primary-light: #e8f5e9;
  --primary-border: #c8e6c9;
}

/* 暗黑模式 (Dark Mode) */
body.theme-dark {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-subtle: #334155;
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #334155;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: #1e3a8a33;
  --primary-border: #1e40af;
  --success-color: #10b981;
  --success-light: #064e3b33;
  --danger-color: #f87171;
  --danger-light: #7f1d1d33;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
}

/* 字号控制 */
body.font-sm { --font-size-base: 14px; }
body.font-md { --font-size-base: 16px; }
body.font-lg { --font-size-base: 18px; }
body.font-xl { --font-size-base: 20px; }

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-size: var(--font-size-base);
  line-height: 1.6;
  transition: background-color 0.25s, color 0.25s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶部导航栏 */
.header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.logo-badge {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.logo-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.logo-sub {
  font-size: 0.75rem;
  color: var(--primary-color);
  font-weight: 600;
}

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

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  padding: 6px 10px;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  transition: all 0.2s;
  background-color: var(--bg-card);
}

.btn-icon:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--text-muted);
}

.btn-icon.active {
  background-color: var(--primary-light);
  color: var(--primary-color);
  border-color: var(--primary-border);
}

/* 备考倒计时条 */
.countdown-banner {
  background: linear-gradient(90deg, #1e3a8a, #2563eb, #3b82f6);
  color: #fff;
  padding: 6px 16px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: center;
  flex-wrap: wrap;
}

.countdown-highlight {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  color: #fef08a;
}

/* 模式导航栏 */
.mode-nav {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.mode-nav-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  padding: 4px 16px;
  gap: 6px;
}

.mode-tab {
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.mode-tab:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

.mode-tab.active {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

.mode-badge {
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background-color: var(--border-color);
  color: var(--text-secondary);
}

.mode-tab.active .mode-badge {
  background-color: var(--primary-color);
  color: #fff;
}

/* 主内容区域 */
.main-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  flex: 1;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 860px) {
  .main-wrapper {
    grid-template-columns: 1fr 320px;
  }
}

/* 刷题主卡片 */
.quiz-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

/* 卡片头部 */
.quiz-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  background-color: var(--bg-card);
}

.q-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.q-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.badge-single { background-color: #dbeafe; color: #1e40af; }
.badge-multi { background-color: #f3e8ff; color: #6b21a8; }
.badge-judge { background-color: #fef3c7; color: #92400e; }

.q-index {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
}

.q-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-star {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 4px 10px;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
}

.btn-star.starred {
  color: #eab308;
  border-color: #fde047;
  background-color: #fefce8;
  font-weight: 600;
}

/* 题目内容区 */
.quiz-body {
  padding: 24px 20px;
  flex: 1;
}

.q-stem {
  font-size: 1.15em;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 22px;
  color: var(--text-main);
  user-select: text;
}

/* 选项列表 */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.option-item {
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: none;
  background-color: var(--bg-card);
}

.option-item:hover:not(.disabled) {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
}

.option-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border-color);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.88em;
  flex-shrink: 0;
  margin-top: 2px;
  background-color: var(--bg-subtle);
  transition: all 0.15s;
}

.option-text {
  flex: 1;
  font-size: 1em;
  color: var(--text-main);
  line-height: 1.5;
}

/* 选中态（模拟考试或做题单选前） */
.option-item.selected {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
}
.option-item.selected .option-key {
  border-color: var(--primary-color);
  background-color: var(--primary-color);
  color: #fff;
}

/* 正确态 */
.option-item.is-correct {
  border-color: var(--success-color) !important;
  background-color: var(--success-light) !important;
}
.option-item.is-correct .option-key {
  border-color: var(--success-color);
  background-color: var(--success-color);
  color: #fff;
}

/* 错误态 */
.option-item.is-wrong {
  border-color: var(--danger-color) !important;
  background-color: var(--danger-light) !important;
}
.option-item.is-wrong .option-key {
  border-color: var(--danger-color);
  background-color: var(--danger-color);
  color: #fff;
}

/* 多选题提交按钮 */
.multi-submit-wrap {
  margin: 16px 0;
  display: flex;
  justify-content: flex-end;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* 解析面板 */
.analysis-box {
  margin-top: 20px;
  border-radius: var(--radius-md);
  padding: 16px;
  background-color: var(--bg-subtle);
  border-left: 4px solid var(--primary-color);
  animation: fadeIn 0.25s ease-out;
}

.analysis-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
}

.ans-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
}

.ans-val {
  color: var(--success-color);
  font-weight: 700;
  font-size: 1.1rem;
}

.analysis-content {
  font-size: 0.95em;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 底部操作工具条 */
.quiz-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.btn-nav {
  padding: 8px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.btn-nav:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  border-color: var(--text-secondary);
}

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

/* 右侧边栏 (PC端控制面板 & 答题卡) */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sidebar-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 答题卡网格 */
.sheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 6px;
  max-height: 380px;
  overflow-y: auto;
  padding: 4px;
  -webkit-overflow-scrolling: touch;
}

.sheet-item {
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  background-color: var(--bg-card);
  transition: all 0.15s;
}

.sheet-item:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.sheet-item.current {
  border: 2px solid var(--primary-color) !important;
  font-weight: 800;
  transform: scale(1.06);
  z-index: 2;
  box-shadow: 0 0 0 2px var(--primary-border);
}

.sheet-item.correct {
  background-color: var(--success-light);
  color: var(--success-color);
  border-color: var(--success-border);
}

.sheet-item.wrong {
  background-color: var(--danger-light);
  color: var(--danger-color);
  border-color: var(--danger-border);
}

.sheet-item.starred::after {
  content: '★';
  position: absolute;
  top: -2px;
  right: 1px;
  font-size: 0.65rem;
  color: #eab308;
}

/* 进度统计 */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  text-align: center;
  margin-bottom: 12px;
}

.stat-box {
  padding: 8px 4px;
  border-radius: var(--radius-md);
  background-color: var(--bg-subtle);
}

.stat-num {
  font-size: 1.15rem;
  font-weight: 700;
}
.stat-num.text-success { color: var(--success-color); }
.stat-num.text-danger { color: var(--danger-color); }
.stat-num.text-primary { color: var(--primary-color); }

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.progress-bar-wrap {
  height: 8px;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 8px;
  display: flex;
}

.progress-bar-fill {
  height: 100%;
  transition: width 0.3s ease;
}
.progress-bar-fill.fill-correct { background-color: var(--success-color); }
.progress-bar-fill.fill-wrong { background-color: var(--danger-color); }

/* 模态弹窗 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s ease-out;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  animation: zoomIn 0.2s ease-out;
}

.modal-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* 考试计时器浮窗 */
.exam-timer-bar {
  background-color: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  padding: 8px 14px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.9rem;
}

.timer-digits {
  font-size: 1.2rem;
  font-family: monospace;
  font-weight: 700;
  color: #b45309;
}

/* 搜索栏样式 */
.search-input-wrap {
  position: relative;
  margin-bottom: 16px;
}

.search-input {
  width: 100%;
  padding: 10px 14px 10px 38px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-color);
  background-color: var(--bg-subtle);
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s;
}

.search-input:focus {
  border-color: var(--primary-color);
  background-color: var(--bg-card);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-result-item {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.15s;
}

.search-result-item:hover {
  background-color: var(--bg-subtle);
}

.search-stem {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.search-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* 动画效果 */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes zoomIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* 响应式辅助类与移动端优化 */
.mobile-only {
  display: none !important;
}

@media (max-width: 859px) {
  .desktop-only {
    display: none !important;
  }
  .mobile-only {
    display: inline-flex !important;
  }
  .sidebar-desktop {
    display: none !important;
  }
  .header-container {
    padding: 8px 12px;
  }
  .quiz-body {
    padding: 16px 14px;
  }
  .quiz-footer {
    padding: 10px 14px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  }
  .main-wrapper {
    padding: 10px 8px;
  }
  .q-stem {
    font-size: 1.1em;
  }
  .option-item {
    padding: 10px 12px;
  }
}