:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #20242a;
  --muted: #667085;
  --line: #dde2ea;
  --accent: #176b87;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  align-items: center;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  padding: 14px 24px;
  position: sticky;
  top: 0;
  z-index: 2;
}

.brand {
  color: var(--accent);
  font-size: 20px;
  font-weight: 700;
}

.version {
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  vertical-align: super;
}

nav {
  display: flex;
  gap: 16px;
}

.page {
  margin: 0 auto;
  max-width: 1120px;
  padding: 24px;
}

.toolbar {
  align-items: center;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 18px;
}

h1 {
  font-size: 28px;
  margin: 0;
}

h2 {
  font-size: 18px;
  line-height: 1.4;
  margin: 8px 0;
}

.panel,
.empty,
.question-item,
.image-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.panel,
.empty {
  padding: 24px;
}

.narrow {
  max-width: 560px;
}

.button,
button {
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-weight: 650;
  justify-content: center;
  padding: 10px 14px;
}

.ghost {
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--muted);
  display: inline-flex;
  padding: 9px 13px;
}

.danger {
  background: var(--danger);
}

.success {
  background: #1e7e34;
}

.primary {
  background: #1a73e8;
}

.warning {
  background: #e67700;
}

.nav-info {
  color: var(--muted);
  font-size: 14px;
  padding: 0 8px;
}

.badge-id {
  background: #e9f2f5;
  border-radius: 4px;
  color: #24576a;
  font-size: 12px;
  padding: 2px 6px;
}

.badge-index {
  background: #f0e6ff;
  border-radius: 4px;
  color: #5b21b6;
  font-size: 12px;
  padding: 2px 6px;
  font-weight: 600;
}

.success-msg {
  background: #e6f4ea;
  border: 1px solid #34a853;
  border-radius: 6px;
  color: #1e7e34;
  padding: 12px 16px;
  margin-bottom: 16px;
}

/* 分析页面样式 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  cursor: pointer;
}

.stat-card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}

@media (max-width: 760px) {
  .analysis-grid {
    grid-template-columns: 1fr;
  }
}

.bar-chart {
  display: grid;
  gap: 10px;
}

.bar-item {
  align-items: center;
  display: grid;
  gap: 8px;
  grid-template-columns: 80px 1fr 40px;
}

.bar-label {
  font-size: 13px;
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bar-track {
  background: var(--bg);
  border-radius: 4px;
  height: 20px;
  overflow: hidden;
}

.bar-fill {
  background: var(--accent);
  border-radius: 4px;
  height: 100%;
  min-width: 4px;
  transition: width 0.3s;
}

.bar-fill.difficulty-easy { background: #34a853; }
.bar-fill.difficulty-medium { background: #f9ab00; }
.bar-fill.difficulty-hard { background: #ea4335; }

.bar-value {
  font-size: 13px;
  font-weight: 600;
  text-align: right;
}

.knowledge-list {
  display: grid;
  gap: 8px;
}

.knowledge-item {
  align-items: center;
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: 6px;
}

.knowledge-name {
  font-size: 14px;
}

.knowledge-count {
  background: #e9f2f5;
  border-radius: 999px;
  color: #24576a;
  font-size: 12px;
  padding: 2px 8px;
}

.error-list {
  display: grid;
  gap: 8px;
}

.error-item {
  align-items: center;
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: 6px;
}

.error-text {
  font-size: 13px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.error-count {
  color: var(--danger);
  font-size: 12px;
  font-weight: 600;
  margin-left: 8px;
}

.ai-analysis {
  margin-top: 18px;
}

.ai-content {
  background: var(--bg);
  border-radius: 8px;
  padding: 20px;
  white-space: pre-wrap;
  line-height: 1.8;
  font-size: 14px;
}

/* 练习模块样式 */
.practice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

@media (max-width: 760px) {
  .practice-grid {
    grid-template-columns: 1fr;
  }
}

.knowledge-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-btn {
  background: #e9f2f5;
  border: 1px solid #b8d4e3;
  border-radius: 999px;
  color: #24576a;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  padding: 6px 14px;
}

.tag-btn:hover {
  background: #d0e6ef;
}

.tag-count {
  background: #b8d4e3;
  border-radius: 999px;
  color: #fff;
  font-size: 11px;
  margin-left: 4px;
  padding: 1px 6px;
}

.quiz-card {
  margin-bottom: 16px;
}

.quiz-question {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-option {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  padding: 12px 16px;
  transition: all 0.2s;
}

.quiz-option:hover {
  background: var(--bg);
  border-color: var(--accent);
}

.quiz-option input[type="radio"] {
  height: 18px;
  width: 18px;
}

.option-key {
  background: var(--accent);
  border-radius: 50%;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  height: 24px;
  line-height: 24px;
  text-align: center;
  width: 24px;
}

.option-text {
  flex: 1;
}

.result-options .quiz-option {
  cursor: default;
}

.correct-answer {
  background: #e6f4ea;
  border-color: #34a853;
}

.wrong-answer {
  background: #fce8e6;
  border-color: #ea4335;
}

.answer-tag {
  background: #34a853;
  border-radius: 4px;
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
}

.wrong-tag {
  background: #ea4335;
}

.explanation {
  background: var(--bg);
  border-radius: 6px;
  margin-top: 12px;
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.6;
}

.result-summary {
  text-align: center;
  padding: 30px;
}

.score {
  color: var(--accent);
  font-size: 36px;
  font-weight: 700;
}

.quiz-card.correct {
  border-left: 4px solid #34a853;
}

.quiz-card.wrong {
  border-left: 4px solid #ea4335;
}

.question-select-list {
  display: grid;
  gap: 10px;
  max-height: 400px;
  overflow-y: auto;
}

.question-select-item {
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  padding: 12px 16px;
  transition: all 0.2s;
}

.question-select-item:hover {
  background: var(--bg);
  border-color: var(--accent);
}

.question-select-item input[type="radio"] {
  flex-shrink: 0;
  height: 18px;
  margin-top: 2px;
  width: 18px;
}

.question-select-text {
  flex: 1;
  line-height: 1.6;
}

.badge-correct {
  background: #34a853;
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 13px;
}

.badge-wrong {
  background: #ea4335;
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 13px;
}

.text-success { color: #34a853; font-weight: 600; }
.text-warning { color: #f9ab00; font-weight: 600; }
.text-danger { color: #ea4335; font-weight: 600; }

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

.form,
.filters {
  display: grid;
  gap: 14px;
}

.filters {
  grid-template-columns: repeat(5, minmax(0, 1fr)) auto;
  margin-bottom: 18px;
}

label {
  display: grid;
  gap: 7px;
}

label span {
  color: var(--muted);
  font-size: 14px;
}

input,
select,
textarea {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  font: inherit;
  min-width: 0;
  padding: 10px 12px;
  width: 100%;
}

textarea {
  resize: vertical;
}

.alert,
.error {
  color: var(--danger);
}

.upload-errors {
  background: #fce8e6;
  border: 1px solid #ea4335;
  border-radius: 6px;
  color: var(--danger);
  margin: 0 0 16px;
  padding: 12px 16px 12px 36px;
}

.analysis-progress {
  display: grid;
  gap: 14px;
}

.analysis-progress progress {
  accent-color: var(--accent);
  height: 14px;
  width: 100%;
}

.analysis-task-list {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.analysis-task {
  align-items: center;
  background: var(--bg);
  border-left: 4px solid var(--muted);
  border-radius: 6px;
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr auto;
  padding: 10px 12px;
}

.analysis-task small {
  color: var(--danger);
  grid-column: 1 / -1;
}

.analysis-task.analyzing {
  border-left-color: #f9ab00;
}

.analysis-task.failed {
  border-left-color: #ea4335;
}

.analysis-task.confirmed,
.analysis-task.pending_review,
.analysis-task.correct,
.analysis-task.mastered,
.analysis-task.practicing {
  border-left-color: #34a853;
}

.analysis-actions {
  display: flex;
  gap: 10px;
}

.question-list {
  display: grid;
  gap: 12px;
}

.question-item {
  align-items: stretch;
  display: flex;
  gap: 12px;
  padding: 12px;
}

.question-item .item-check {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
}

.question-item .item-check input {
  height: 20px;
  width: 20px;
}

.question-item .item-main {
  display: grid;
  flex: 1 1 auto;
  gap: 16px;
  grid-template-columns: 132px 1fr;
  min-width: 0;
}

.question-item img {
  aspect-ratio: 4 / 3;
  background: #eef1f5;
  border-radius: 6px;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.question-item .item-actions {
  align-items: stretch;
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

.question-item .item-actions form {
  display: flex;
}

.question-item .item-actions .ghost,
.question-item .item-actions button {
  padding: 8px 12px;
  text-align: center;
  width: 72px;
}

.meta,
.chips {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 13px;
  gap: 8px;
}

.chips span {
  background: #e9f2f5;
  border-radius: 999px;
  color: #24576a;
  padding: 4px 8px;
}

.detail-grid {
  align-items: start;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(280px, 44%) 1fr;
}

.image-panel {
  padding: 12px;
}

.image-panel img {
  border-radius: 6px;
  display: block;
  max-height: 72vh;
  object-fit: contain;
  width: 100%;
}

.fields {
  display: grid;
  gap: 10px 18px;
  grid-template-columns: 88px 1fr;
  margin: 0;
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
}

.multiline {
  white-space: pre-wrap;
}

.edit-form {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.batch-bar {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  bottom: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  display: flex;
  gap: 12px;
  left: 50%;
  max-width: 720px;
  padding: 12px 16px;
  position: fixed;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  z-index: 10;
}

.batch-bar label {
  align-items: center;
  display: flex;
  gap: 8px;
}

.batch-bar input[type="checkbox"] {
  height: 18px;
  width: 18px;
}

.batch-bar select {
  flex: 1 1 auto;
  min-width: 120px;
  width: auto;
}

.batch-bar button {
  flex: 0 0 auto;
}

/* 表格样式 */
.table {
  border-collapse: collapse;
  margin: 16px 0;
  width: 100%;
}

.table th,
.table td {
  border-bottom: 1px solid var(--line);
  padding: 12px;
  text-align: left;
}

.table th {
  background: var(--bg);
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
}

.table tbody tr:hover {
  background: var(--bg);
}

.table .url {
  font-size: 12px;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.table .actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* 徽章样式 */
.badge {
  border-radius: 999px;
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
}

.badge.active {
  background: #e6f4ea;
  color: #1e7e34;
}

.badge.inactive {
  background: #f3f4f6;
  color: var(--muted);
}

.badge.env {
  background: #e8f0fe;
  color: #1a73e8;
}

.badge.db {
  background: #fef3e8;
  color: #b45b0b;
}

/* 按钮小号变体 */
button.small {
  font-size: 13px;
  padding: 6px 10px;
}

/* 提示文本 */
.hint {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 16px;
}

/* 空状态 */
.empty {
  color: var(--muted);
  font-style: italic;
}

@media (max-width: 760px) {
  .topbar,
  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .page {
    padding: 16px;
  }

  .filters,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .question-item {
    flex-direction: column;
  }

  .question-item .item-main {
    grid-template-columns: 1fr;
  }

  .question-item .item-actions {
    flex-direction: row;
    justify-content: flex-end;
  }

  .fields {
    grid-template-columns: 1fr;
  }

  .batch-bar {
    flex-wrap: wrap;
  }

  .batch-bar select {
    flex: 1 1 100%;
  }

  .table {
    display: block;
    overflow-x: auto;
  }
}