* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #16a34a;
  --danger: #dc2626;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, #eef2ff 0%, #f0f4f8 50%, #ecfdf5 100%);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.6;
  /* 防止个别超宽元素（如超长下拉选项）把整页撑出横向滚动；clip 不会破坏 sticky 按钮 */
  overflow-x: clip;
  /* iPhone 刘海/灵动岛与底部横条安全区（仅 PWA 全屏模式生效） */
  padding-top: env(safe-area-inset-top);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
}

.app {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.header {
  text-align: center;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 4px;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  background: var(--surface);
  padding: 8px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.tab {
  flex: 1;
  min-width: 100px;
  padding: 10px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: all 0.2s;
}

.tab:hover {
  background: #f1f5f9;
  color: var(--text);
}

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

.panel {
  display: none;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.panel.active {
  display: block;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.toolbar.filters {
  flex-direction: column;
  align-items: stretch;
}

/* 关键修复：筛选区子项必须允许收缩、且不得超过容器宽度。
   超长下拉选项（如“K01-K03 RoHS/质量体系/制程工艺（20 题）”）
   会把子项的内容最小宽度撑到约 376px，而换行的纵向 flex 中
   行宽取子项的最大适应宽度，于是整行连同“开始练习 / 结束本轮”
   按钮一起溢出白色卡片边界。min-width:0 允许收缩，max-width:100%
   把子项钳制在容器内，超长选项由下拉框自身收缩消化。 */
.toolbar.filters > * {
  min-width: 0;
  max-width: 100%;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.filter-row label {
  font-size: 0.9rem;
  min-width: 0;
  max-width: 100%;
}

.type-filters {
  padding: 10px 0;
}

.filter-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  cursor: pointer;
}

.toolbar select,
.form-grid select,
.form-inline select,
.form-inline input,
.text-input {
  margin-left: 0;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
}

.toolbar select {
  margin-left: 6px;
  min-width: 0;
  max-width: 100%;
}

.progress-info {
  display: flex;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.quiz-area {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  background: #dbeafe;
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-gray {
  background: #f1f5f9;
  color: var(--text-muted);
}

.question-id {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.question-title {
  font-size: 1.25rem;
  margin-bottom: 20px;
  line-height: 1.5;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
}

.option:hover:not(.disabled) {
  border-color: #93c5fd;
  background: #f8fafc;
}

.option.selected {
  border-color: var(--primary);
  background: #eff6ff;
}

.option.correct {
  border-color: var(--success);
  background: #f0fdf4;
}

.option.wrong {
  border-color: var(--danger);
  background: #fef2f2;
}

.option.disabled {
  cursor: default;
}

.option-label {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  border-radius: 50%;
  font-weight: 600;
  font-size: 0.85rem;
}

.option.correct .option-label {
  background: var(--success);
  color: white;
}

.option.wrong .option-label {
  background: var(--danger);
  color: white;
}

.explanation {
  padding: 14px 16px;
  background: #fffbeb;
  border-left: 4px solid #f59e0b;
  border-radius: 0 8px 8px 0;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.actions {
  display: flex;
  gap: 12px;
}

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #f1f5f9;
  color: var(--text);
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-danger {
  background: #fee2e2;
  color: var(--danger);
  margin-top: 16px;
}

.btn-danger:hover {
  background: #fecaca;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #15803d;
}

.btn-danger-outline {
  background: white;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.btn-danger-outline:hover {
  background: #fef2f2;
}

.text-answer-area {
  margin-bottom: 20px;
}

.fill-row {
  margin-bottom: 10px;
}

.fill-row label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.text-input {
  width: 100%;
  max-width: 100%;
}

.essay-input {
  min-height: 120px;
  resize: vertical;
}

.input-correct {
  border-color: var(--success) !important;
  background: #f0fdf4;
}

.input-wrong {
  border-color: var(--danger) !important;
  background: #fef2f2;
}

.self-grade-area {
  padding: 16px;
  background: #f8fafc;
  border-radius: 10px;
  margin-bottom: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.self-grade-area p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.import-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.import-tab {
  padding: 8px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.import-tab.active {
  background: #eff6ff;
  color: var(--primary);
  font-weight: 600;
}

.import-panel {
  display: none;
}

.import-panel.active {
  display: block;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
}

.form-grid .full-width {
  grid-column: 1 / -1;
}

.form-grid textarea,
.form-grid input[type="text"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
}

.form-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.form-inline input,
.form-inline select {
  flex: 1;
  min-width: 120px;
}

.manage-section {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.manage-section:last-child {
  border-bottom: none;
}

.manage-section h3 {
  font-size: 1rem;
  margin-bottom: 12px;
}

.bank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bank-item {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fafafa;
}

.bank-item-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.question-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.question-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafafa;
}

.question-item-body {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.question-num {
  color: var(--text-muted);
  font-weight: 600;
  flex-shrink: 0;
}

.question-item-title {
  font-size: 0.95rem;
  word-break: break-word;
}

.manage-section label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.manage-section select {
  display: block;
  width: 100%;
  max-width: 400px;
  margin-top: 6px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.chapter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.tag {
  padding: 3px 10px;
  background: #e2e8f0;
  border-radius: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.empty-state,
.finish-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.finish-state h2 {
  color: var(--text);
  margin-bottom: 12px;
}

.hidden {
  display: none !important;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}

.stat-card {
  text-align: center;
  padding: 20px;
  background: #f8fafc;
  border-radius: 10px;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.backup-section {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.backup-section h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

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

.wrong-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.wrong-item {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fafafa;
}

.wrong-item .title {
  font-weight: 600;
  margin-bottom: 8px;
}

.wrong-item .meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.wrong-item-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.import-box h3 {
  margin-bottom: 8px;
}

.hint {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.import-box input[type="file"] {
  display: block;
  margin-bottom: 12px;
}

.import-box textarea {
  width: 100%;
  min-height: 200px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.85rem;
  margin-bottom: 12px;
  resize: vertical;
}

code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ---------- 同步状态指示器 ---------- */

.sync-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  background: #f1f5f9;
  color: var(--text-muted);
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #94a3b8;
  flex-shrink: 0;
}

.sync-status.online {
  background: #f0fdf4;
  color: var(--success);
}

.sync-status.online .sync-dot {
  background: var(--success);
}

.sync-status.offline {
  background: #fffbeb;
  color: #b45309;
}

.sync-status.offline .sync-dot {
  background: #f59e0b;
}

.sync-status.connecting .sync-dot {
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ---------- 页头元信息 / 安装按钮 ---------- */

.header-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.header-meta .sync-status {
  margin-top: 0;
}

.install-btn {
  white-space: nowrap;
}

/* ---------- 题号导航网格 ---------- */

.progress-info {
  align-items: center;
  flex-wrap: wrap;
}

.progress-info .btn {
  margin-left: auto;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 8px;
  margin: 4px 0 18px;
}

.nav-cell {
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.nav-cell:hover {
  border-color: #93c5fd;
  background: #f8fafc;
}

.nav-cell.answered {
  background: #dbeafe;
  border-color: #93c5fd;
  color: var(--primary);
}

.nav-cell.correct {
  background: #dcfce7;
  border-color: #86efac;
  color: #15803d;
}

.nav-cell.wrong {
  background: #fee2e2;
  border-color: #fca5a5;
  color: #b91c1c;
}

.nav-cell.pending {
  background: #fef9c3;
  border-color: #fde047;
  color: #a16207;
}

.nav-cell.current {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
  color: var(--primary);
}

/* ---------- 模拟考试：组卷配置 ---------- */

.exam-block-title {
  font-size: 1rem;
  margin: 22px 0 12px;
}

.exam-block-title:first-child {
  margin-top: 0;
}

.exam-setup-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.exam-setup-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
}

.exam-setup-grid select,
.exam-setup-grid input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
}

.exam-config-table {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.exam-config-head,
.exam-config-row {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
}

.exam-config-head {
  background: #f8fafc;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.exam-config-row + .exam-config-row {
  border-top: 1px solid var(--border);
}

.exam-config-name {
  font-weight: 600;
}

.exam-config-row input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
}

.exam-avail {
  font-size: 0.85rem;
  color: var(--text-muted);
}

#startExamBtn {
  width: 100%;
  margin-top: 18px;
  padding: 13px;
  font-size: 1.02rem;
}

.exam-resume {
  margin-top: 18px;
  padding: 14px 16px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
}

.exam-resume p {
  margin: 0 0 10px;
  font-size: 0.92rem;
}

/* ---------- 模拟考试：答题区 ---------- */

.exam-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.exam-timer {
  padding: 4px 14px;
  border-radius: 8px;
  background: #eff6ff;
  color: var(--primary);
  font-size: 1.2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.exam-timer.time-danger {
  background: #fef2f2;
  color: var(--danger);
  animation: pulse 1s ease-in-out infinite;
}

.exam-answered {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.exam-toolbar .btn {
  margin: 0 0 0 auto;
}

.exam-nav-grid {
  margin: 0 0 16px;
}

/* ---------- 模拟考试：结果与复盘 ---------- */

.exam-result-title {
  margin-bottom: 16px;
}

.exam-review-actions {
  margin: 14px 0 4px;
}

.exam-review-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.exam-review-item {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  border-radius: 10px;
  background: #fafafa;
}

.exam-review-item.is-correct {
  border-left-color: var(--success);
}

.exam-review-item.is-wrong {
  border-left-color: var(--danger);
  background: #fffdfd;
}

.exam-review-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.exam-review-mark {
  margin-left: auto;
  font-size: 0.85rem;
  font-weight: 600;
}

.is-correct .exam-review-mark { color: var(--success); }
.is-wrong .exam-review-mark { color: var(--danger); }

.exam-review-title {
  margin-bottom: 8px;
  font-weight: 600;
}

.exam-review-item .meta {
  font-size: 0.88rem;
  color: var(--text-muted);
  word-break: break-word;
}

.exam-no-answer {
  color: var(--danger);
  font-weight: 600;
}

/* ---------- 手机端适配 ---------- */

/* iOS Safari 输入框默认有内阴影，统一去掉（复选框/单选框单独自定义，不能抹平） */
input:not([type="checkbox"]):not([type="radio"]),
select,
textarea,
button {
  -webkit-appearance: none;
  -webkit-tap-highlight-color: transparent;
}

/* iOS Safari 聚焦字号小于 16px 的输入框会自动缩放页面，统一放开缩放限制 */
input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
  font-size: max(16px, 1em) !important;
}

/* 题型复选框：自定义成始终清晰可见、带勾选反馈的样式 */
.checkbox-label input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin: 0;
  border: 2px solid #94a3b8;
  border-radius: 5px;
  background: #ffffff;
  display: inline-grid;
  place-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s;
}

.checkbox-label input[type="checkbox"]::after {
  content: "";
  width: 10px;
  height: 6px;
  margin-bottom: 2px;
  border-left: 2.5px solid #ffffff;
  border-bottom: 2.5px solid #ffffff;
  transform: rotate(-45deg) scale(0);
  transition: transform 0.15s ease;
}

.checkbox-label input[type="checkbox"]:checked {
  background: var(--primary);
  border-color: var(--primary);
}

.checkbox-label input[type="checkbox"]:checked::after {
  transform: rotate(-45deg) scale(1);
}

@media (max-width: 600px) {
  .app {
    padding: 14px 10px calc(32px + env(safe-area-inset-bottom));
  }

  .header {
    margin-bottom: 14px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  /* 顶部导航横向滑动，避免四个标签纵向占用过多空间 */
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 6px;
    margin-bottom: 14px;
    scrollbar-width: none;
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab {
    flex: 0 0 auto;
    min-width: 88px;
    padding: 10px 14px;
    white-space: nowrap;
  }

  .panel {
    padding: 16px 12px;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-row {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .filter-row label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
  }

  /* 16px 字号可避免 iOS 聚焦输入框时自动放大页面 */
  .toolbar select,
  .form-grid select,
  .form-grid input,
  .form-grid textarea,
  .form-inline input,
  .form-inline select,
  .text-input,
  #jsonInput {
    font-size: 16px;
    flex: 1;
    min-width: 0;
    max-width: 100%;
  }

  .toolbar select {
    margin-left: 0;
  }

  .type-filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .type-filters .filter-label,
  .type-filters .btn {
    grid-column: 1 / -1;
  }

  .checkbox-label {
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    justify-content: center;
    gap: 6px;
    background: #fff;
  }

  .checkbox-label:has(input:checked) {
    border-color: var(--primary);
    background: #eff6ff;
    color: var(--primary);
    font-weight: 600;
  }

  .question-title {
    font-size: 1.08rem;
  }

  .option {
    padding: 13px 14px;
  }

  .option-label {
    width: 30px;
    height: 30px;
  }

  .actions {
    position: sticky;
    bottom: 0;
    background: linear-gradient(transparent, var(--surface) 30%);
    padding: 10px 0 4px;
    margin: -4px 0;
  }

  .actions .btn {
    flex: 1;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .self-grade-area {
    gap: 8px;
  }

  .self-grade-area .btn {
    flex: 1;
    padding: 12px 10px;
  }

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

  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }

  .form-inline input,
  .form-inline select,
  .form-inline .btn {
    width: 100%;
  }

  .bank-item-header,
  .question-item {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .bank-item-header .btn,
  .question-item .btn {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stat-card {
    padding: 16px 8px;
  }

  .import-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .import-tabs::-webkit-scrollbar {
    display: none;
  }

  .import-tab {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .sync-status {
    font-size: 0.75rem;
  }

  /* 页头安装按钮 */
  .header-meta {
    gap: 8px;
  }

  /* 题号网格 */
  .nav-grid {
    grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
    gap: 6px;
  }

  .nav-cell {
    height: 36px;
  }

  /* 考试组卷配置堆叠 */
  .exam-setup-grid {
    grid-template-columns: 1fr;
  }

  .exam-setup-grid select,
  .exam-setup-grid input,
  .exam-config-row input {
    font-size: 16px;
  }

  .exam-config-head {
    display: none;
  }

  .exam-config-row {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .exam-config-name,
  .exam-avail {
    grid-column: 1 / -1;
  }

  /* 考试计时条 */
  .exam-toolbar {
    flex-wrap: wrap;
    gap: 10px;
  }

  .exam-timer {
    font-size: 1.05rem;
  }

  .exam-answered {
    margin-right: auto;
  }
}