/* 做题态顶栏(带计时器)在 module-x 独立页贴住视口顶端。
 *
 * 共享的 .exam-topbar 本来就是 position:sticky, 但配的是 top:48px ——
 * 那 48px 是给主站的常驻 .top-bar 让位的。module-x.html 既不加载
 * student.css 也没有 .top-bar 元素, 于是那 48px 成了一条空缝, 题目从
 * 缝里滚过去, 看着就像顶栏没固定住。这里只把偏移改回 0。
 *
 * 用 body[data-module-x-exam] 做 opt-in 而不动共享类: 该标记全仓只出现
 * 在 module-x.html:20, 主站考试页拿不到这条规则, 顶栏仍旧让位给 .top-bar。
 * (仓内既有约定, 本文件其余规则同款写法。)
 *
 * 只改带计时器的 .exam-topbar; 目录/加载/错题回看那三处是另一个类
 * .exam-top-bar, 站主没要求它们固定, 不顺手一起改。
 *
 * student-exam.html 会加载 nav.js 并显示 .aa-topbar，因此必须继续使用共享
 * 样式的 48px/44px 偏移；只有不显示全站导航的 module-x.html 才能置顶为 0。
 */
body[data-module-x-exam="true"] .exam-topbar {
  top: 0;
}

/* 独立页没有主站侧栏，桌面端应把可用视口交给双栏考场。style.css 的
 * 通用 .container 只给内容页使用，1100px 上限会让 1440px/大屏两侧空一截。 */
body[data-module-x-exam="true"] > .container {
  box-sizing: border-box;
  margin: 0;
  max-width: none;
  padding: 0;
  width: 100%;
}

body[data-module-x-exam="true"] #examApp,
body[data-module-x-exam="true"] .exam-select {
  box-sizing: border-box;
  max-width: none;
  width: 100%;
}

body[data-module-x-exam="true"] .mx-practice-mode-bar {
  margin: 8px auto 0;
}

body[data-module-x-exam="true"] .mx-set-page {
  min-width: 150px;
}

body[data-module-x-exam="true"] .mx-collection-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 18px 0 16px;
}

body[data-module-x-exam="true"] .mx-collection-tab {
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  background: #fff;
  color: #334155;
  padding: 9px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

body[data-module-x-exam="true"] .mx-collection-tab:hover {
  border-color: #64748b;
  background: #f8fafc;
}

body[data-module-x-exam="true"] .mx-collection-tab.is-active {
  border-color: #111827;
  background: #111827;
  color: #fff;
}

body[data-module-x-exam="true"] .mx-catalog-actions {
  display: flex;
  justify-content: center;
  margin: 18px 0 8px;
}

body[data-module-x-exam="true"] .mx-owner-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin: 10px 0 0;
  padding: 7px 10px;
  border: 1px dashed #94a3b8;
  border-radius: 6px;
  background: #f8fafc;
  color: #475569;
  font-size: 11px;
  line-height: 1.45;
}

body[data-module-x-exam="true"] .mx-owner-five-toggle {
  flex: 0 0 auto;
  border: 1px solid #64748b;
  border-radius: 999px;
  background: #fff;
  color: #0f172a;
  padding: 5px 10px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

body[data-module-x-exam="true"] .mx-owner-source-badge {
  margin-right: auto;
  border-radius: 999px;
  background: #e0f2fe;
  color: #075985;
  padding: 5px 10px;
  font-weight: 800;
}

body[data-module-x-exam="true"] .mx-owner-five-toggle:hover {
  background: #e2e8f0;
}

@media (max-width: 700px) {
  body[data-module-x-exam="true"] .exam-catalog-tools {
    grid-template-columns: 1fr;
  }

  body[data-module-x-exam="true"] .mx-collection-tabs {
    align-items: stretch;
    flex-direction: column;
  }

  body[data-module-x-exam="true"] .mx-owner-controls {
    align-items: stretch;
    flex-direction: column;
  }

  body[data-module-x-exam="true"] .mx-owner-five-toggle {
    align-self: flex-start;
  }
}

/* === 错题回看 (2026-08-14) === */
.mx-wrong-section {
  margin: 20px 0 8px;
}

.mx-wrong-section-title {
  font-size: 1.05em;
  margin: 0 0 8px;
}

.mx-wrong-set {
  margin-bottom: 8px;
}

.mx-wrong-set-summary {
  color: var(--text, #1f2937);
  font-size: 0.95em;
  font-weight: 700;
  margin-bottom: 6px;
}

.mx-wrong-set-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mx-wrong-set-mode,
.mx-wrong-set-toggle {
  background: var(--card-bg, #fff);
  border: 1px solid var(--border, #d5d9e0);
  border-radius: 8px;
  cursor: pointer;
  flex: 1 1 180px;
  font-size: 0.9em;
  padding: 10px 14px;
  text-align: left;
}

.mx-wrong-set-mode.is-open {
  border-color: var(--accent, #2563eb);
  font-weight: 600;
}

.mx-wrong-card {
  border: 1px solid var(--border, #d5d9e0);
  border-radius: 10px;
  margin: 10px 0;
  padding: 14px 16px;
}

.mx-wrong-card-header {
  align-items: baseline;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.mx-wrong-card-num {
  font-weight: 700;
}

.mx-wrong-card-skill,
.mx-wrong-card-ts {
  color: var(--muted, #667085);
  font-size: 0.88em;
}

.mx-wrong-card-result {
  border-radius: 999px;
  font-size: 0.82em;
  padding: 2px 8px;
}

.mx-wrong-card-result-correct {
  background: rgba(34, 160, 84, 0.1);
  color: #16733c;
}

.mx-wrong-card-result-wrong {
  background: rgba(220, 58, 58, 0.1);
  color: #a12828;
}

.mx-wrong-card-result-unanswered {
  background: rgba(100, 116, 139, 0.12);
  color: var(--muted, #667085);
}

.mx-review-mode-heading {
  color: var(--muted, #667085);
  font-size: 0.9em;
  margin: 10px 0 4px;
}

.mx-wrong-card-body {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.mx-wrong-card-body:not(:has(.mx-wrong-passage)) {
  grid-template-columns: minmax(0, 1fr);
}

.mx-wrong-card-body > .mx-wrong-right:only-child {
  grid-column: 1 / -1;
}

.mx-wrong-passage-text,
.mx-wrong-stem {
  line-height: 1.6;
  white-space: normal;
}

.mx-wrong-stem {
  font-weight: 600;
  margin-bottom: 8px;
}

.mx-wrong-choice {
  border: 1px solid transparent;
  border-radius: 6px;
  margin: 4px 0;
  padding: 6px 8px;
}

.mx-wrong-choice.is-correct {
  background: rgba(34, 160, 84, 0.1);
  border-color: rgba(34, 160, 84, 0.55);
}

.mx-wrong-choice.user-wrong {
  background: rgba(220, 58, 58, 0.08);
  border-color: rgba(220, 58, 58, 0.55);
}

.mx-wrong-choice-label {
  font-weight: 700;
  margin-right: 6px;
}

.mx-wrong-answer-line {
  color: var(--muted, #667085);
  font-size: 0.9em;
  margin-top: 10px;
}

.mx-wrong-explanation {
  background: rgba(37, 99, 235, 0.06);
  border-radius: 8px;
  margin-top: 10px;
  padding: 10px 12px;
}

.mx-wrong-empty,
.mx-wrong-loading {
  color: var(--muted, #667085);
  margin: 8px 0;
}

@media (max-width: 900px) {
  .mx-wrong-card-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .mx-wrong-set-mode,
  .mx-wrong-set-toggle {
    flex-basis: 100%;
  }
}

/* 错题回看的上一题/下一题导航 (2026-08-16)。
   语义是**卡片间跳转**不是轮播 —— 整套错题仍平铺可见, 导航只做定位 + 标出当前卡。
   颜色一律走 CSS 变量, 跟 .mx-wrong-card / .exam-btn-sm 同一套, 不硬编码。 */
.mx-wrong-nav {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 4px;
  margin-bottom: 4px;
  background: var(--card, #fff);
  border-bottom: 1px solid var(--border, #d5d9e0);
}
.mx-wrong-nav-btn[disabled] {
  opacity: 0.45;
  cursor: default;
}
.mx-wrong-nav-count {
  font-size: 12px;
  color: var(--text2, #68708a);
  min-width: 56px;
  text-align: center;
}
/* 当前卡: 只加左侧标记条, 不改背景 —— 背景变化会干扰高亮的视觉 */
.mx-wrong-card.is-mx-current {
  border-left: 3px solid var(--accent, #2b5db8);
}