:root {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --line: #dbe3ef;
  --text: #1e2635;
  --sub: #61708b;
  --primary: #2563eb;
  --primary-soft: #eaf1ff;
  --ok: #059669;
  --bad: #dc2626;
  --warn: #d97706;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100%;
}

.hidden { display: none !important; }
.muted { color: var(--sub); }
.small { font-size: 12px; }

input, select, textarea, button {
  font-family: inherit;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: #fff;
  color: var(--text);
  width: 100%;
}

textarea { resize: vertical; }

button {
  cursor: pointer;
  background: #f8fbff;
}
button:hover { background: var(--primary-soft); }
button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
button.primary:hover { filter: brightness(0.95); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

/* 登录 / 注册 */
.auth-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card {
  width: 380px;
  max-width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 20px 50px rgba(16, 30, 65, 0.06);
}

.auth-card h1 { margin: 0; font-size: 20px; }
.auth-card p { margin: 6px 0 16px; }

.tabs {
  display: flex;
  background: #f5f7fb;
  padding: 4px;
  border-radius: 10px;
  margin-bottom: 14px;
}
.tab-btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 7px 0;
  border-radius: 8px;
  cursor: pointer;
}
.tab-btn.active { background: #fff; box-shadow: 0 1px 2px rgba(0,0,0,0.08); }

.auth-form { display: grid; gap: 8px; }
.auth-form label { font-size: 13px; color: var(--sub); }
.form-msg { font-size: 13px; min-height: 18px; color: var(--bad); }
.form-msg.ok { color: var(--ok); }

/* 主应用布局 */
.app-view { display: grid; grid-template-rows: auto 1fr; min-height: 100vh; }

.appbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 10px 16px;
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 2;
}

.appbar-brand { display: flex; gap: 10px; align-items: center; }
.appbar-brand strong { font-size: 16px; }
.appbar-brand .muted { align-self: baseline; }
.bank-select {
  width: auto;
  padding: 6px 28px 6px 10px;
  border: 1px solid var(--primary);
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
}
.bank-select:hover { background: #fff; }
.bank-select:focus { outline: none; box-shadow: 0 0 0 2px rgba(76, 110, 245, 0.2); }
.appbar-tabs { display: flex; gap: 4px; justify-content: center; }

.nav-btn {
  width: auto;
  padding: 7px 14px;
  background: transparent;
  border-color: transparent;
  color: var(--sub);
}
.nav-btn:hover { background: var(--primary-soft); color: var(--text); }
.nav-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.appbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
}
.appbar-user button { width: auto; }

/* 视图 */
.view {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  gap: 12px;
  padding: 14px 16px;
}

.view[data-view="review"], .view[data-view="stats"] {
  grid-template-columns: 1fr;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.main-panel {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
}
.main-panel.wide { width: 100%; }

.side-panel h2 { margin: 0 0 10px; font-size: 15px; }
.field-label { display: block; margin: 10px 0 4px; color: var(--sub); font-size: 13px; }

.side-meta {
  margin-top: 14px;
  border-top: 1px dashed var(--line);
  padding-top: 12px;
  display: grid;
  gap: 6px;
}
.stat-line { display: flex; justify-content: space-between; font-size: 13px; }

.question-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 10px;
}
.question-head .meta { color: var(--sub); font-size: 13px; }
.head-actions { display: flex; gap: 6px; align-items: center; }
.head-actions button { width: auto; }
.question-title { margin: 10px 0 6px; font-size: 20px; line-height: 1.55; }
/* 练习页：整块题目区可点开知识点弹窗（与题库浏览同一 #knowledgeModal） */
.practice-question-tap.practice-question-tap--ready {
  cursor: pointer;
  border-radius: 10px;
  padding: 2px 4px 6px;
  margin: -2px -4px 4px;
  transition: background 0.15s;
}
.practice-question-tap.practice-question-tap--ready:hover {
  background: rgba(37, 99, 235, 0.06);
}
.practice-question-tap--ready .question-title {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(37, 99, 235, 0.35);
  text-underline-offset: 3px;
}
.practice-question-tap--ready:hover .question-title {
  color: #1d4ed8;
  text-decoration-color: rgba(29, 78, 216, 0.55);
}

.progress-bar {
  height: 8px;
  border-radius: 999px;
  background: #e8edf7;
  margin: 10px 0;
  overflow: hidden;
}
.progress-bar > div {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #2563eb, #4f8dff);
  transition: width .2s;
}

.options { display: grid; gap: 8px; margin: 10px 0; }
.option {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.option:hover { border-color: #a9c3ff; }
.option.selected { border-color: #7ea6ff; background: #f3f8ff; }
.option.correct { border-color: #8ad7b6; background: #ecfdf5; }
.option.wrong { border-color: #f1a3a3; background: #fff1f1; }
.option-label { flex: 1; min-width: 0; line-height: 1.5; }

/* 选项前的单选 / 多选指示器 */
.option-mark {
  display: inline-block;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 1.5px solid #c7cfdc;
  background: #fff;
  box-sizing: border-box;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}
.option-mark--radio { border-radius: 50%; }
.option-mark--check { border-radius: 4px; }

.option:hover .option-mark { border-color: #7ea6ff; }

/* 选中态 */
.option.selected .option-mark--radio {
  border-color: var(--primary, #2563eb);
}
.option.selected .option-mark--radio::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--primary, #2563eb);
}
.option.selected .option-mark--check {
  border-color: var(--primary, #2563eb);
  background: var(--primary, #2563eb);
}
.option.selected .option-mark--check::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 0px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* 判定后的颜色覆盖: 正确用绿色, 错误用红色, 保持选中图示 */
.option.correct .option-mark { border-color: #10b981; }
.option.correct.selected .option-mark--radio { border-color: #10b981; }
.option.correct.selected .option-mark--radio::after { background: #10b981; }
.option.correct.selected .option-mark--check {
  border-color: #10b981;
  background: #10b981;
}
.option.wrong .option-mark { border-color: #ef4444; }
.option.wrong .option-mark--radio::after { background: #ef4444; }
.option.wrong .option-mark--check {
  border-color: #ef4444;
  background: #ef4444;
}

/* 置灰的「提交答案」按钮(单选题场景) */
#practiceSubmitBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #eef2f7;
  color: #94a3b8;
  border-color: #e2e8f0;
}

.feedback {
  border-radius: 10px;
  padding: 10px;
  background: #f7faff;
  color: var(--sub);
  font-size: 14px;
  min-height: 38px;
}
.feedback.ok { background: #ecfdf5; color: var(--ok); }
.feedback.bad { background: #fff1f1; color: var(--bad); }

.question-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.note-box {
  margin-top: 14px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}
.note-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--sub);
}

.record-box {
  margin-top: 14px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}
.record-head { font-size: 13px; color: var(--sub); margin-bottom: 4px; }
.record-row { font-size: 13px; }

.bank-list {
  margin-top: 10px;
  max-height: 64vh;
  overflow: auto;
  display: grid;
  gap: 6px;
}
.bank-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  cursor: pointer;
  font-size: 12.5px;
  background: #fff;
}
.bank-item:hover { background: #f7faff; }
.bank-item .row1 { color: var(--sub); font-size: 11px; margin-bottom: 2px; }
.bank-item .row2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.bank-item.active { border-color: var(--primary); background: var(--primary-soft); }

/* 模考面板 */
.exam-timer {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  background: #fff5e6;
  color: var(--warn);
  font-variant-numeric: tabular-nums;
}
.exam-timer.warn { background: #fee2e2; color: var(--bad); }

.exam-grid {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 5px;
}
.exam-grid button {
  padding: 6px 0;
  font-size: 12px;
  width: 100%;
  background: #fff;
}
.exam-grid button.answered { background: #ecfdf5; border-color: #8ad7b6; }
.exam-grid button.marked { background: #fef3c7; border-color: #e0b84a; }
.exam-grid button.current { outline: 2px solid var(--primary); outline-offset: -2px; }
.exam-grid button.wrong { background: #fef2f2; border-color: #fca5a5; color: var(--bad); }
.exam-grid button.ok { background: #ecfdf5; border-color: #86efac; color: var(--ok); }

.divider {
  height: 1px;
  background: var(--line);
  margin: 12px 0;
}

.exam-history {
  max-height: 56vh;
  overflow: auto;
  display: grid;
  gap: 6px;
  margin-top: 8px;
}
.exam-history .ex-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  font-size: 12.5px;
}

/* 错题 / 收藏 */
.review-tabs { display: flex; gap: 6px; margin-bottom: 10px; }
.review-list { display: grid; gap: 8px; }
.review-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}
.review-card .meta { font-size: 12px; color: var(--sub); margin-bottom: 4px; }
.review-card .q { font-weight: 600; margin-bottom: 6px; }
.review-card .opts { display: grid; gap: 4px; font-size: 13px; }
.review-card .opt {
  padding: 2px 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.review-card .opt-label { flex: 1; min-width: 0; line-height: 1.5; }
.review-card .opt.correct { color: var(--ok); font-weight: 600; }

/* 错题 / 收藏 / 已作答 列表里: 答案所在选项前显示带色的单选 / 多选标记, 其余只画轮廓 */
.review-card .opt-mark {
  display: inline-block;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 3px;
  border: 1.5px solid #c7cfdc;
  background: #fff;
  box-sizing: border-box;
  position: relative;
}
.review-card .opt-mark--radio { border-radius: 50%; }
.review-card .opt-mark--check { border-radius: 3px; }
.review-card .opt.correct .opt-mark--radio {
  border-color: var(--ok, #10b981);
}
.review-card .opt.correct .opt-mark--radio::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--ok, #10b981);
}
.review-card .opt.correct .opt-mark--check {
  border-color: var(--ok, #10b981);
  background: var(--ok, #10b981);
}
.review-card .opt.correct .opt-mark--check::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 0;
  width: 4px;
  height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* 统计 */
.stats-overview {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
}
.stats-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
}
.stats-card .label { color: var(--sub); font-size: 12px; }
.stats-card .value { font-size: 22px; font-weight: 600; margin-top: 4px; }

.stats-by-cat {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 10px;
}
.cat-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
}
.cat-card .cat { font-weight: 600; }
.cat-card .row {
  font-size: 12.5px;
  color: var(--sub);
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
}

/* 题库通栏浏览（左侧筛选栏 + 右侧列表） */
.view[data-view="browse"] {
  grid-template-columns: 280px 1fr;
  align-items: start;
}
.browse-main { min-height: 80vh; }

.browse-sidebar {
  position: sticky;
  top: 64px;
  align-self: start;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.browse-title {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.browse-filters {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.browse-filters input,
.browse-filters > select {
  width: 100%;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.filter-label {
  font-size: 12px;
  color: var(--sub);
  font-weight: 600;
  letter-spacing: 0.2px;
}

.filter-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 2px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.filter-actions button {
  width: 100%;
  padding: 9px 12px;
  white-space: nowrap;
}

.cat-cascade {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cat-cascade select {
  width: 100%;
  min-width: 0;
}
.cat-cascade select:disabled {
  background: #f5f7fb;
  color: #a0a7b4;
  cursor: not-allowed;
}

.mode-switch {
  display: flex;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  height: 36px;
}
.mode-switch button {
  flex: 1;
  border: none;
  border-radius: 0;
  background: #fff;
  color: var(--sub);
  padding: 0 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.mode-switch button + button { border-left: 1px solid var(--line); }
.mode-switch button:hover { background: #f5f7fb; color: var(--ink); }
.mode-switch button.active {
  background: var(--primary);
  color: #fff;
}
.mode-switch button.active:hover { background: var(--primary); color: #fff; }

/* 虚拟滚动: 外层容器只负责纵向排列各个 .browse-page, 真正的栅格在 .browse-page 上 */
.browse-list {
  display: block;
}
.browse-page {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 10px;
}
.browse-page + .browse-page { margin-top: 10px; }

.browse-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  background: #fff;
  cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.browse-card:hover {
  border-color: #a9c3ff;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.08);
}
.browse-card.target { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

.browse-card .meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--sub);
  font-size: 12px;
}
.browse-card .pill {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}
.pill-single { background: #eff6ff; color: #2563eb; }
.pill-multi { background: #fef3c7; color: #b45309; }
.pill-ai { background: #ecfdf5; color: #059669; }
.pill-rule { background: #f5f3ff; color: #7c3aed; }

.browse-card .q-text {
  font-size: 14.5px;
  line-height: 1.55;
  font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.browse-card .q-ans {
  font-size: 12.5px;
  color: var(--ok);
}

/* 详细模式：展示选项与完整题干 */
.browse-card .c-opts { display: none; }
.browse-list.detail .browse-page { grid-template-columns: repeat(auto-fill, minmax(420px, 1fr)); }
.browse-list.detail .browse-card .q-text {
  display: block;
  -webkit-line-clamp: unset;
  overflow: visible;
}
.browse-list.detail .browse-card .c-opts {
  display: grid;
  gap: 6px;
  margin-top: 4px;
}
.browse-list.detail .browse-card .c-opts .opt {
  font-size: 13px;
  line-height: 1.5;
  padding: 6px 10px;
  border-radius: 6px;
  background: #f7faff;
  border: 1px solid #e5ecff;
  color: var(--ink);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.browse-list.detail .browse-card .c-opts .opt.correct {
  background: #ecfdf5;
  border-color: #8ad7b6;
  color: var(--ok);
  font-weight: 500;
}
.browse-list.detail .browse-card .c-opts .opt .opt-key {
  font-weight: 700;
  flex: 0 0 auto;
}
.browse-list.detail .browse-card .c-opts .opt .opt-text {
  flex: 1;
  min-width: 0;
}

/* 题库预览详情模式: 选项前的单选 / 多选标记; 命中正确答案的选项显示绿色填充 */
.browse-list.detail .browse-card .c-opts .opt-mark {
  display: inline-block;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 3px;
  border: 1.5px solid #c7cfdc;
  background: #fff;
  box-sizing: border-box;
  position: relative;
}
.browse-list.detail .browse-card .c-opts .opt-mark--radio { border-radius: 50%; }
.browse-list.detail .browse-card .c-opts .opt-mark--check { border-radius: 3px; }
.browse-list.detail .browse-card .c-opts .opt.correct .opt-mark--radio {
  border-color: var(--ok, #10b981);
}
.browse-list.detail .browse-card .c-opts .opt.correct .opt-mark--radio::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--ok, #10b981);
}
.browse-list.detail .browse-card .c-opts .opt.correct .opt-mark--check {
  border-color: var(--ok, #10b981);
  background: var(--ok, #10b981);
}
.browse-list.detail .browse-card .c-opts .opt.correct .opt-mark--check::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 0;
  width: 4px;
  height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.browse-sentinel {
  text-align: center;
  padding: 18px;
  font-size: 12.5px;
}
.browse-sentinel.end { color: var(--sub); }

/* 模态框 */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal.hidden { display: none !important; }
.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
}
.modal-card {
  position: relative;
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 22px;
  width: 440px;
  max-width: 100%;
  box-shadow: 0 30px 70px rgba(16, 30, 65, 0.18);
}
.modal-card h3 { margin: 0 0 8px; font-size: 17px; }
.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 14px;
}
.modal-actions button { width: auto; padding: 8px 14px; }

/* 知识点弹窗 */
.knowledge-card {
  width: 720px;
  max-height: 85vh;
  overflow-y: auto;
}
.k-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 4px;
}
.k-meta { color: var(--sub); font-size: 12.5px; }
.k-close {
  width: auto;
  border: none;
  background: transparent;
  font-size: 22px;
  line-height: 1;
  padding: 0 8px;
  color: var(--sub);
  cursor: pointer;
}
.k-close:hover { color: var(--text); background: transparent; }
.k-title { margin: 6px 0 10px; font-size: 18px; line-height: 1.5; }
.k-opts { display: grid; gap: 6px; margin-bottom: 10px; }
.k-opts .opt {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13.5px;
  background: #fafbff;
}
.k-opts .opt.correct { background: #ecfdf5; border-color: #8ad7b6; color: var(--ok); font-weight: 500; }

.k-answer {
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  margin-bottom: 12px;
}

.k-sections {
  display: grid;
  gap: 10px;
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}
.k-section {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 10px;
  align-items: start;
}
.k-key {
  font-size: 12px;
  color: var(--sub);
  padding: 3px 8px;
  background: #f5f7fb;
  border-radius: 6px;
  text-align: center;
}
.k-val {
  font-size: 13.5px;
  line-height: 1.7;
  white-space: pre-wrap;
}
.k-val.empty { color: var(--sub); font-style: italic; }

.k-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.k-actions button { width: auto; padding: 8px 14px; }

@media (max-width: 1100px) {
  .view { grid-template-columns: 1fr; }
  .view[data-view="browse"] { grid-template-columns: 1fr; }
  .browse-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
  }
  .stats-overview { grid-template-columns: repeat(3, 1fr); }
  .exam-grid { grid-template-columns: repeat(6, 1fr); }
  .browse-filters {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .filter-group:nth-child(1),
  .filter-group:nth-child(2),
  .filter-actions { grid-column: 1 / -1; }
  .cat-cascade { grid-template-columns: 1fr 1fr 1fr; }
  .filter-actions { flex-direction: row; }
  .filter-actions button { flex: 1; }
  .browse-list.detail .browse-page { grid-template-columns: 1fr; }
  .knowledge-card { width: 100%; }
  .k-section { grid-template-columns: 1fr; }
  .confirm-card, .result-card { width: 100%; }
  .result-stats { grid-template-columns: 1fr 1fr; }
}

/* 通用确认弹窗 */
.confirm-card {
  width: 440px;
  max-width: 100%;
}
.confirm-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.confirm-head h3 { margin: 0; font-size: 16px; }
.confirm-card .k-close {
  background: transparent;
  border: 0;
  font-size: 22px;
  color: var(--sub);
  cursor: pointer;
  width: 28px;
  height: 28px;
  padding: 0;
  line-height: 1;
}
.confirm-card .k-close:hover { color: var(--ink); }
.confirm-message {
  font-size: 14px;
  line-height: 1.6;
  margin: 4px 0 0;
}
.confirm-stats {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 14px;
  font-size: 13px;
}
.confirm-stats li {
  background: #f7faff;
  border: 1px solid #e5ecff;
  border-radius: 8px;
  padding: 6px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.confirm-stats li strong { color: var(--ink); }
.confirm-stats li strong.warn { color: var(--bad); }
.confirm-stats:empty { display: none; }
.confirm-card .modal-actions { margin-top: 18px; }

/* 修改密码弹窗 */
.pwd-card {
  width: 420px;
  max-width: 100%;
}
.pwd-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.pwd-head h3 { margin: 0; font-size: 16px; }
.pwd-card .k-close {
  background: transparent;
  border: 0;
  font-size: 22px;
  color: var(--sub);
  cursor: pointer;
  width: 28px;
  height: 28px;
  padding: 0;
  line-height: 1;
}
.pwd-card .k-close:hover { color: var(--ink); }
.pwd-form { display: flex; flex-direction: column; gap: 4px; }
.pwd-form label {
  font-size: 13px;
  color: var(--sub);
  margin-top: 8px;
}
.pwd-form input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
}
.pwd-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(76, 110, 245, 0.15);
}
.pwd-form .form-msg { margin-top: 10px; min-height: 18px; }
.pwd-card .modal-actions { margin-top: 6px; }

/* 考试结果弹窗 */
.result-card {
  width: 480px;
  max-width: 100%;
}
.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.result-head h3 { margin: 0; font-size: 16px; }
.result-card .k-close {
  background: transparent;
  border: 0;
  font-size: 22px;
  color: var(--sub);
  cursor: pointer;
  width: 28px;
  height: 28px;
  padding: 0;
  line-height: 1;
}
.result-card .k-close:hover { color: var(--ink); }
.result-body {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.result-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  background: #ecfdf5;
  color: var(--ok);
  border: 1px solid #86efac;
}
.result-badge.bad {
  background: #fef2f2;
  color: var(--bad);
  border-color: #fca5a5;
}
.result-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.result-accuracy {
  font-size: 40px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 1px;
}
.result-badge.bad ~ .result-score .result-accuracy { color: var(--bad); }
.result-badge:not(.bad) ~ .result-score .result-accuracy { color: var(--ok); }
.result-ratio {
  font-size: 13px;
  color: var(--sub);
}
.result-stats {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  width: 100%;
}
.result-stats li {
  background: #f7faff;
  border: 1px solid #e5ecff;
  border-radius: 8px;
  padding: 8px 6px;
  text-align: center;
  font-size: 12px;
  color: var(--sub);
}
.result-stats li strong {
  display: block;
  margin-top: 2px;
  font-size: 16px;
  color: var(--ink);
}
.result-stats li.ok strong { color: var(--ok); }
.result-stats li.bad strong { color: var(--bad); }
.result-stats li.warn strong { color: var(--warn); }
.result-first {
  width: 100%;
  background: #fffbeb;
  border: 1px dashed #fcd34d;
  color: #78350f !important;
  padding: 8px 10px;
  border-radius: 8px;
  line-height: 1.5;
}
.result-card .modal-actions { margin-top: 18px; }