/* ===================================================
   主题系统 — 通过 CSS 变量 + data-theme 属性切换
   三套主题：default / dark-sidebar / warm
   =================================================== */

/* ========== 默认主题（当前浅色） ========== */
:root, [data-theme="default"] {
  --bg-body: #f0f2f5;
  --bg-sidebar: #fafbfc;
  --bg-sidebar-border: #ebedf0;
  --bg-card: #fff;
  --bg-content: #f0f2f5;
  --bg-header: linear-gradient(90deg, #1a73e8, #4285f4);
  --header-shadow: 0 2px 8px rgba(26, 115, 232, 0.3);
  --color-primary: #1a73e8;
  --color-primary-light: #e8f0fe;
  --color-primary-bg: #eef2ff;
  --color-success: #34a853;
  --color-danger: #ea4335;
  --color-text: #1a1a2e;
  --color-text-secondary: #4b5563;
  --color-text-muted: #9ca3af;
  --color-text-placeholder: #8c8c8c;
  --color-border: #e8eaed;
  --color-border-light: #f0f2f5;
  --sidebar-item-hover: #f0f1f3;
  --sidebar-item-active-bg: #eef2ff;
  --sidebar-item-active-text: #1a73e8;
  --sidebar-item-text: #4b5563;
  --sidebar-divider: #ebedf0;
  --sidebar-label: #9ca3af;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
  --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
  --card-radius: 16px;
  --stat-gradient: linear-gradient(135deg, #1a73e8, #34a853);
  --finish-bg: linear-gradient(135deg, #f0f7ff, #f0faf0);
  --table-header-bg: #f8f9fa;
  --option-bg: #fff;
  --option-border: #e8eaed;
  --option-hover-bg: #f0f7ff;
  --option-label-bg: #f0f2f5;
  --quiz-progress-bg: #f5f5f5;
  --login-gradient: linear-gradient(135deg, #1a73e8 0%, #34a853 50%, #4285f4 100%);
}

/* ========== 主题A：暗色侧栏 ========== */
[data-theme="dark-sidebar"] {
  --bg-sidebar: #1f2937;
  --bg-sidebar-border: #374151;
  --sidebar-item-hover: #374151;
  --sidebar-item-active-bg: rgba(99, 162, 255, 0.15);
  --sidebar-item-active-text: #93bbfc;
  --sidebar-item-text: #d1d5db;
  --sidebar-divider: #374151;
  --sidebar-label: #6b7280;
  --bg-header: linear-gradient(90deg, #111827, #1f2937);
  --header-shadow: 0 2px 8px rgba(0,0,0,0.4);
  --color-primary: #60a5fa;
  --color-primary-light: rgba(96,165,250,0.15);
  --color-primary-bg: rgba(96,165,250,0.1);
  --stat-gradient: linear-gradient(135deg, #60a5fa, #34d399);
  --login-gradient: linear-gradient(135deg, #111827 0%, #1e3a5f 50%, #1f2937 100%);
}

/* ========== 主题B：暖色调 ========== */
[data-theme="warm"] {
  --bg-body: #faf8f5;
  --bg-sidebar: #fdfcfa;
  --bg-sidebar-border: #e8e4de;
  --bg-card: #fffffe;
  --bg-content: #faf8f5;
  --bg-header: linear-gradient(90deg, #8b7355, #a08b6c);
  --header-shadow: 0 2px 8px rgba(139, 115, 85, 0.3);
  --color-primary: #8b7355;
  --color-primary-light: #f0ebe4;
  --color-primary-bg: #f5f0e8;
  --color-success: #6b8e5e;
  --color-danger: #c45c4a;
  --color-text: #3d3429;
  --color-text-secondary: #6b5e50;
  --color-text-muted: #a89b8c;
  --color-text-placeholder: #b0a495;
  --color-border: #e0dbd4;
  --color-border-light: #f0ece6;
  --sidebar-item-hover: #f0ece6;
  --sidebar-item-active-bg: #f0ebe4;
  --sidebar-item-active-text: #6b5233;
  --sidebar-item-text: #6b5e50;
  --sidebar-divider: #e8e4de;
  --sidebar-label: #b0a495;
  --card-shadow: 0 4px 20px rgba(100,80,50,0.06);
  --card-shadow-hover: 0 8px 24px rgba(100,80,50,0.12);
  --stat-gradient: linear-gradient(135deg, #8b7355, #6b8e5e);
  --finish-bg: linear-gradient(135deg, #faf5ee, #f0ebe4);
  --table-header-bg: #faf5ee;
  --option-bg: #fffffe;
  --option-border: #e0dbd4;
  --option-hover-bg: #faf5ee;
  --option-label-bg: #f0ece6;
  --quiz-progress-bg: #f0ece6;
  --login-gradient: linear-gradient(135deg, #8b7355 0%, #6b8e5e 50%, #a08b6c 100%);
}

/* ========== 基础 ========== */
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
}

/* ========== 登录页 ========== */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--login-gradient);
  background-size: 400% 400%;
  animation: gradientMove 8s ease infinite;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.login-container::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 60%);
  animation: float 6s ease-in-out infinite;
}

@keyframes gradientMove {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33%  { transform: translate(30px, -30px) rotate(2deg); }
  66%  { transform: translate(-20px, 20px) rotate(-1deg); }
}

.login-box {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  padding: 48px 40px;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(255,255,255,0.2);
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 1;
  animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-box h1 {
  text-align: center;
  margin: 0 0 4px 0;
  color: var(--color-text);
  font-size: 26px;
  letter-spacing: 1px;
}

.login-box .subtitle {
  text-align: center;
  color: var(--color-text-placeholder);
  margin: 0 0 32px 0;
  font-size: 14px;
}

.demo-accounts {
  margin-top: 24px;
  padding: 16px;
  background: var(--finish-bg);
  border-radius: 10px;
  font-size: 13px;
  color: #555;
  border: 1px solid var(--color-border);
}

.demo-accounts p { margin: 5px 0; }

/* ========== 主布局 ========== */
.main-container { min-height: 100vh; }

.main-header {
  background: var(--bg-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  box-shadow: var(--header-shadow);
  height: 56px;
}

.logo {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 1px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.username {
  color: rgba(255,255,255,0.95);
  font-weight: 500;
  font-size: 14px;
}

.main-header .el-tag { border: none; }

.main-header .el-button {
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}
.main-header .el-button:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.8);
  color: #fff;
}

/* ========== 主题切换器 ========== */
.theme-switcher {
  display: flex;
  gap: 6px;
  margin-right: 4px;
}

.theme-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.theme-dot:hover {
  transform: scale(1.2);
  border-color: rgba(255,255,255,0.8);
}

.theme-dot.active {
  border-color: #fff;
  box-shadow: 0 0 0 2px rgba(255,255,255,0.3);
}

.theme-dot.dot-default { background: linear-gradient(135deg, #4285f4, #34a853); }
.theme-dot.dot-dark { background: linear-gradient(135deg, #1f2937, #374151); }
.theme-dot.dot-warm { background: linear-gradient(135deg, #8b7355, #c4a87c); }

/* ========== 侧边栏 ========== */
.main-aside {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--bg-sidebar-border);
  padding-top: 8px;
  transition: background 0.3s, border-color 0.3s;
}

.main-aside .el-menu {
  border-right: none;
  background: transparent;
  --el-menu-active-color: var(--sidebar-item-active-text);
}

/* 分组标签 */
.menu-group-label {
  list-style: none;
  padding: 20px 20px 6px 20px;
  font-size: 11px;
  font-weight: 600;
  color: var(--sidebar-label);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  line-height: 1;
}

.menu-group-label:first-child {
  padding-top: 12px;
}

/* 分隔线 */
.menu-group-divider {
  list-style: none;
  height: 1px;
  background: var(--sidebar-divider);
  margin: 8px 16px;
}

.main-aside .el-menu-item {
  height: 40px;
  line-height: 40px;
  margin: 2px 10px;
  padding-left: 20px !important;
  border-radius: 8px;
  font-size: 14px;
  color: var(--sidebar-item-text);
  transition: all 0.15s ease;
  position: relative;
}

.main-aside .el-menu-item:hover {
  background: var(--sidebar-item-hover);
  color: var(--sidebar-item-active-text);
}

.main-aside .el-menu-item.is-active {
  background: var(--sidebar-item-active-bg);
  color: var(--sidebar-item-active-text);
  font-weight: 600;
}

.main-aside .el-menu-item.is-active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--sidebar-item-active-text);
  border-radius: 0 3px 3px 0;
}

/* ========== 主内容 ========== */
.main-content {
  padding: 28px;
  background: var(--bg-content);
  transition: background 0.3s;
}

.main-content h2 {
  margin: 0 0 24px 0;
  color: var(--color-text);
  font-size: 20px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ========== 章节树 ========== */
.chapter-node {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  padding-right: 16px;
}

.el-tree-node__content {
  height: 36px !important;
}

/* ========== 统计卡片 ========== */
.stat-card {
  text-align: center;
  padding: 16px 0;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  background: var(--stat-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  color: var(--color-text-placeholder);
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.5px;
}

.el-card {
  border-radius: 12px;
  border: none;
  box-shadow: var(--card-shadow);
  transition: all 0.3s;
  background: var(--bg-card);
}

.el-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
}

/* ========== 刷题卡片 ========== */
.quiz-card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  padding: 36px 40px;
  box-shadow: var(--card-shadow);
  max-width: 860px;
  margin: 0 auto;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border-light);
}

.quiz-progress {
  font-size: 13px;
  color: var(--color-text-placeholder);
  background: var(--quiz-progress-bg);
  padding: 4px 12px;
  border-radius: 20px;
}

.quiz-title-text {
  font-weight: 600;
  color: var(--color-text);
  font-size: 15px;
}

.quiz-type-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-left: 10px;
  vertical-align: middle;
}

.quiz-type-badge.single {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.quiz-type-badge.multi {
  background: #fef3e0;
  color: #e37400;
}

.quiz-stem {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 24px;
  color: var(--color-text-secondary);
}

.quiz-image {
  max-width: 100%;
  max-height: 260px;
  object-fit: contain;
  margin: 12px auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  cursor: zoom-in;
}

.quiz-image.zoomed {
  max-height: none;
  cursor: zoom-out;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.quiz-option {
  padding: 14px 18px;
  border: 2px solid var(--option-border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.25s;
  background: var(--option-bg);
  display: flex;
  align-items: center;
  position: relative;
}

.option-text { flex: 1; }

.option-hotkey {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  background: var(--quiz-progress-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 11px;
  font-family: "SF Mono", Monaco, Menlo, Consolas, monospace;
  color: var(--color-text-muted);
  margin-left: 12px;
  flex-shrink: 0;
}

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

.quiz-option.disabled .option-hotkey { opacity: 0.3; }

.quiz-option:hover:not(.disabled) {
  border-color: var(--color-primary);
  background: var(--option-hover-bg);
  transform: translateX(4px);
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: #e6f4ea;
}

.quiz-option.wrong {
  border-color: var(--color-danger);
  background: #fce8e6;
}

.quiz-option.disabled {
  cursor: default;
}

.quiz-option.disabled:hover { transform: none; }

.option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  min-width: 30px;
  background: var(--option-label-bg);
  border-radius: 50%;
  margin-right: 14px;
  font-weight: 700;
  font-size: 14px;
  color: #555;
  transition: all 0.25s;
}

.quiz-option.selected .option-label {
  background: var(--color-primary);
  color: #fff;
}

.quiz-option.correct .option-label {
  background: var(--color-success);
  color: #fff;
}

.quiz-option.wrong .option-label {
  background: var(--color-danger);
  color: #fff;
}

.quiz-feedback {
  padding: 16px 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  animation: fadeIn 0.3s ease;
}

.quiz-feedback.correct {
  background: #e6f4ea;
  color: #137333;
  border-left: 4px solid var(--color-success);
}

.quiz-feedback.wrong {
  background: #fce8e6;
  color: #c5221f;
  border-left: 4px solid var(--color-danger);
}

.quiz-feedback-title {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 15px;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
}

.empty-text {
  text-align: center;
  color: var(--color-text-placeholder);
  padding: 60px 40px;
  font-size: 16px;
}

/* ========== 题目预览 ========== */
.question-preview { padding: 12px; }
.option-preview { padding: 4px 0; color: var(--color-text-secondary); }

/* ========== 完成页 ========== */
.finish-card {
  text-align: center;
  padding: 48px;
  background: var(--bg-card);
  border-radius: var(--card-radius);
  max-width: 500px;
  margin: 40px auto;
  box-shadow: var(--card-shadow);
  animation: fadeIn 0.4s ease;
}

.finish-icon {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 12px;
  background: var(--stat-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -2px;
}

.finish-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.finish-stats {
  display: flex;
  justify-content: space-around;
  margin: 28px 0;
  padding: 24px;
  background: var(--finish-bg);
  border-radius: 12px;
}

.finish-stat-item { text-align: center; }

.finish-stat-item .value {
  font-size: 32px;
  font-weight: 700;
  background: var(--stat-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.finish-stat-item .label {
  color: var(--color-text-placeholder);
  font-size: 13px;
  margin-top: 6px;
}

/* ========== 表格美化 ========== */
.el-table {
  border-radius: 10px;
  overflow: hidden;
}

.el-table th.el-table__cell {
  background: var(--table-header-bg) !important;
  color: var(--color-text);
  font-weight: 600;
}

/* ========== 管理员对话框 ========== */
.el-dialog {
  border-radius: 12px !important;
}

.el-dialog__header {
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: 16px !important;
}

/* ========== 题型标签 ========== */
.q-type-tag {
  display: inline-block;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 6px;
  font-weight: 600;
}

.q-type-tag.multi {
  background: #fef3e0;
  color: #e37400;
}

.q-type-tag.single {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ========== 分页 ========== */
.el-pagination {
  justify-content: flex-end;
}

/* ========== 快捷键提示 ========== */
.quiz-hotkey-hint {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--color-border);
  font-size: 12px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.quiz-hotkey-hint kbd {
  display: inline-block;
  padding: 2px 7px;
  margin: 0 2px;
  background: var(--quiz-progress-bg);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-family: "SF Mono", Monaco, Menlo, Consolas, monospace;
  font-size: 11px;
  color: var(--color-text-secondary);
  line-height: 1.4;
  vertical-align: baseline;
}

/* ========== 下一主题提示 ========== */
.next-topic-prompt {
  margin-top: 20px;
  padding: 20px;
  background: var(--finish-bg);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.next-topic-prompt p {
  margin: 0 0 4px 0;
  color: var(--color-text);
  font-size: 15px;
}

/* ========== 专题练习 ========== */
.topic-card {
  background: var(--bg-card);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transition: all 0.25s;
  border: 2px solid transparent;
}

.topic-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.topic-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.topic-card-icon {
  font-size: 14px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}

.topic-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.topic-card-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.topic-card-meta {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
  font-size: 13px;
  color: var(--color-text-muted);
}

/* 阶段列表 */
.topic-stages {
  max-width: 700px;
}

.topic-stage-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 10px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  transition: all 0.2s;
  position: relative;
}

.topic-stage-card:hover {
  box-shadow: var(--card-shadow);
}

.topic-stage-card.empty {
  opacity: 0.5;
}

.topic-stage-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.topic-stage-card.empty .topic-stage-num {
  background: var(--color-text-muted);
}

.topic-stage-num.stage-done {
  background: #34a853;
}

.topic-stage-card.done {
  border-left: 3px solid #34a853;
}

.topic-stage-body {
  flex: 1;
  min-width: 0;
}

.topic-stage-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.topic-stage-desc {
  font-size: 12px;
  color: var(--color-text-muted);
}

.topic-stage-meta {
  font-size: 12px;
  color: var(--color-text-placeholder);
  margin-top: 2px;
}

/* 阶段之间的连接线 */
.topic-stage-card:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 37px;
  bottom: -10px;
  width: 2px;
  height: 10px;
  background: var(--color-border);
}

/* ========== 任务卡片 ========== */
.task-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 12px;
  box-shadow: var(--card-shadow);
  transition: all 0.3s;
}

.task-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

.task-card.finished {
  opacity: 0.7;
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.task-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.task-card-meta {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-placeholder);
  flex-wrap: wrap;
}

.task-card-meta span::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--color-border);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}

.task-card-meta span:first-child::before {
  display: none;
}

.task-card-deadline {
  font-size: 13px;
  color: var(--color-text-placeholder);
  white-space: nowrap;
  background: var(--quiz-progress-bg);
  padding: 4px 10px;
  border-radius: 6px;
}

.task-card-deadline.urgent {
  background: #fef0f0;
  color: #F56C6C;
  font-weight: 600;
}

/* ========== 汉堡菜单按钮（默认隐藏） ========== */
.menu-toggle {
  display: none;
  font-size: 22px;
  color: #fff;
  cursor: pointer;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background 0.2s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.menu-toggle:active { background: rgba(255,255,255,0.2); }

/* ========== 移动端遮罩（默认隐藏） ========== */
.mobile-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s;
  -webkit-tap-highlight-color: transparent;
}
.mobile-backdrop.show { opacity: 1; }

/* ========== 响应式：手机端 ========== */
@media (max-width: 768px) {
  /* 汉堡按钮 */
  .menu-toggle { display: flex; }

  /* 遮罩 */
  .mobile-backdrop { display: block; pointer-events: none; }
  .mobile-backdrop.show { pointer-events: auto; }

  /* 侧边栏变抽屉 */
  .main-aside {
    position: fixed !important;
    top: 56px;
    left: 0;
    bottom: 0;
    width: 240px !important;
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: none;
  }
  .main-aside.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
  }

  /* 头部紧凑 */
  .main-header { padding: 0 12px !important; height: 56px; }
  .logo { font-size: 15px !important; }
  .user-info { gap: 8px !important; }
  .user-info .username { display: none; }
  .user-info .el-tag { display: none; }

  /* 主题切换器紧凑 */
  .theme-dot { width: 14px; height: 14px; }

  /* 主内容全宽 */
  .main-content { padding: 12px !important; }
  .main-content h2 { font-size: 17px; margin-bottom: 16px; }

  /* 登录页 */
  .login-box { padding: 28px 20px; max-width: 100%; }
  .login-box h1 { font-size: 22px; }

  /* 刷题卡片 */
  .quiz-card { padding: 16px !important; border-radius: 12px; }
  .quiz-stem { font-size: 15px; line-height: 1.7; }
  .quiz-header { flex-wrap: wrap; gap: 8px; }
  .quiz-header > span { flex-wrap: wrap; gap: 6px !important; }
  .quiz-actions { flex-wrap: wrap; gap: 8px; }
  .quiz-option { padding: 12px 14px; }
  .option-label { width: 26px; height: 26px; min-width: 26px; font-size: 13px; margin-right: 10px; }
  .option-hotkey { display: none; }
  .quiz-hotkey-hint { display: none; }

  /* 完成卡片 */
  .finish-card { padding: 28px 16px; margin: 20px auto; }
  .finish-stats { padding: 16px 8px; gap: 4px; }
  .finish-stat-item .value { font-size: 24px; }

  /* 统计卡片 */
  .stat-value { font-size: 28px; }

  /* 章节树 */
  .chapter-node { padding-right: 4px; flex-wrap: wrap; gap: 4px; }

  /* 表格横向滚动 */
  .el-table { font-size: 13px; }
  .el-table .el-table__cell { padding: 8px 0; }

  /* 对话框接近全屏 */
  .el-dialog { width: 95% !important; margin-top: 5vh !important; }
  .el-dialog__body { padding: 12px 16px !important; }

  /* 分页紧凑 */
  .el-pagination { justify-content: center; }
  .el-pagination .el-pagination__sizes { display: none; }
  .el-pagination .el-pagination__jump { display: none; }

  /* 任务卡片 */
  .task-card { padding: 14px 16px; }
  .task-card-header { flex-direction: column; gap: 8px; }

  /* 下一主题提示 */
  .next-topic-prompt { padding: 14px; }
}


/* ===================================================
   综合题训练模块
   =================================================== */

/* 首页 - 题型卡片 */
.structured-type-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px 24px;
  cursor: pointer;
  text-align: center;
  min-width: 130px;
  transition: all 0.2s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.structured-type-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}
.structured-type-icon { font-size: 28px; margin-bottom: 8px; }
.structured-type-name { font-size: 15px; font-weight: 600; color: var(--color-text); }
.structured-type-count { font-size: 13px; color: var(--color-text-muted); margin-top: 4px; }

/* 首页 - 章节行 */
.structured-chapter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 15px;
  color: var(--color-text);
}
.structured-chapter-row:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* 答题卡片 */
.structured-card {
  max-width: 800px;
  margin: 0 auto;
}

/* 材料区 */
.structured-scenario {
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: 14px 18px;
  border-radius: 0 10px 10px 0;
  margin-bottom: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}
.structured-scenario-label {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
  font-size: 13px;
}

/* 步骤提示 */
.structured-step-prompt {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 16px;
}

/* Step 0: 题型选择 */
.structured-type-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.structured-type-btn {
  padding: 10px 20px;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all 0.2s;
  background: var(--bg-card);
}
.structured-type-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.structured-type-btn.selected { border-color: var(--color-primary); background: var(--color-primary-light); color: var(--color-primary); }
.structured-type-btn.correct { border-color: var(--color-success) !important; background: #f0f9eb !important; color: var(--color-success) !important; }
.structured-type-btn.wrong { border-color: var(--color-danger) !important; background: #fef0f0 !important; color: var(--color-danger) !important; }

/* 反馈 */
.structured-feedback {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 16px;
}
.structured-feedback.correct { background: #f0f9eb; color: #67C23A; }
.structured-feedback.wrong { background: #fef0f0; color: #F56C6C; }

/* 操作按钮行 */
.structured-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

/* Step 1: 角度选择 */
.structured-angle-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}
.structured-angle-chip {
  padding: 10px 18px;
  border: 2px solid var(--color-border);
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: all 0.2s;
  background: var(--bg-card);
  position: relative;
}
.structured-angle-chip:hover { border-color: var(--color-primary); }
.structured-angle-chip.selected { border-color: var(--color-primary); background: var(--color-primary-light); color: var(--color-primary); font-weight: 500; }
.structured-angle-chip.feedback-hit { border-color: var(--color-success) !important; background: #f0f9eb !important; color: var(--color-success) !important; }
.structured-angle-chip.feedback-missed { border-color: #E6A23C !important; background: #fdf6ec !important; color: #E6A23C !important; border-style: dashed; }
.structured-angle-chip.feedback-wrong { border-color: var(--color-danger) !important; background: #fef0f0 !important; color: var(--color-danger) !important; text-decoration: line-through; }

.angle-mark { margin-left: 6px; font-weight: 700; }
.angle-mark.wrong { color: var(--color-danger); }

.structured-angle-feedback { margin-top: 16px; }
.angle-feedback-section { margin-bottom: 12px; }
.angle-feedback-title { font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.angle-feedback-item { display: flex; align-items: center; margin-bottom: 4px; flex-wrap: wrap; }

/* Step 2: 关键词输入 */
.structured-keyword-list { display: flex; flex-direction: column; gap: 16px; }
.structured-keyword-item {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px 16px;
}
.structured-keyword-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--color-text);
}

/* Step 3: 对照答案 */
.structured-compare-list { display: flex; flex-direction: column; gap: 16px; }
.structured-compare-item {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px 16px;
}
.structured-compare-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.structured-compare-label { font-weight: 600; font-size: 14px; color: var(--color-text); }
.structured-compare-row { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.structured-compare-mine, .structured-compare-ref {
  font-size: 14px;
  line-height: 1.6;
  padding: 8px 12px;
  border-radius: 8px;
}
.structured-compare-mine { background: #f5f5f5; color: var(--color-text); }
.structured-compare-ref { background: #f0f9eb; color: #4a7c3f; }
.compare-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  margin-right: 6px;
  background: #ddd;
  color: #666;
}
.compare-tag.ref { background: #b7e1a1; color: #2d5a1e; }

.structured-self-score {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 参考答案区 */
.structured-ref-answer {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: 12px;
  padding: 16px 20px;
  margin-top: 20px;
}
.structured-ref-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* 得分汇总 */
.structured-score-summary {
  text-align: center;
  margin-top: 16px;
  padding: 12px;
  background: var(--stat-gradient);
  color: #fff;
  border-radius: 10px;
  font-size: 16px;
}
.structured-score-summary strong { font-size: 22px; margin-left: 4px; }

/* 移动端适配 */
@media (max-width: 768px) {
  .structured-type-card { min-width: 100px; padding: 14px 16px; }
  .structured-type-icon { font-size: 22px; }
  .structured-angle-grid { gap: 6px; }
  .structured-angle-chip { padding: 8px 14px; font-size: 13px; }
  .structured-type-options { gap: 6px; }
  .structured-type-btn { padding: 8px 14px; font-size: 13px; }
  .structured-compare-row { gap: 6px; }
  .structured-card { margin: 0; }
}