/* === 知识测验页 === */
.exam-frame { max-width: 920px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.exam-card { padding: 22px 24px; }
.exam-card h2 { font-size: 22px; margin: 4px 0 8px; }
.exam-card h3 { font-size: 15px; margin: 0 0 12px; }
.exam-lead { color: var(--text-light); font-size: 13.5px; line-height: 1.7; margin-bottom: 16px; }
.exam-muted { color: var(--text-muted); font-size: 12.5px; }
.exam-error { color: var(--md-error, #ba5b4f); font-size: 13px; }
.exam-notice { font-size: 13px; color: var(--text-light); background: var(--bg); border-radius: 10px; padding: 10px 12px; margin-bottom: 12px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* 首页:年龄、科目 */
.exam-field { display: flex; align-items: flex-start; gap: 12px; margin: 14px 0; flex-wrap: wrap; }
.exam-field > .exam-muted { align-self: center; }
.exam-label { font-size: 13px; font-weight: 600; min-width: 40px; padding-top: 8px; }
.exam-field select { font-size: 14px; padding: 7px 12px; border: 1px solid var(--border); background: var(--card-bg); color: var(--text); }
.exam-chips { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }
.exam-chip { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border: 1.5px solid var(--border); border-radius: 999px; font-size: 13px; cursor: pointer; background: var(--card-bg); user-select: none; }
.exam-chip input { position: absolute; opacity: 0; pointer-events: none; }
.exam-chip small { color: var(--text-muted); font-size: 11px; }
.exam-chip.on { border-color: var(--md-primary, var(--accent)); background: color-mix(in srgb, var(--md-primary, var(--accent)) 12%, transparent); color: var(--md-primary, var(--accent)); font-weight: 600; }
.exam-chip:focus-within { outline: 3px solid color-mix(in srgb, var(--md-primary, var(--accent)) 50%, transparent); }
.exam-plan { font-size: 13px; color: var(--text-light); margin: 6px 0 14px; }
.exam-start { font-size: 15px; padding: 10px 28px; }
.exam-start[disabled] { opacity: .5; cursor: not-allowed; }
.exam-draft { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 12px; border: 1px dashed var(--md-primary, var(--accent)); border-radius: 12px; font-size: 13px; margin-bottom: 8px; }
.exam-draft span { flex: 1 1 260px; }

.exam-history { display: flex; flex-direction: column; gap: 8px; }
.exam-history-row { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border: 1px solid var(--border); background: var(--card-bg); color: var(--text); text-align: left; cursor: pointer; font: inherit; }
.exam-history-row:hover { border-color: var(--md-primary, var(--accent)); }
.exam-history-score { font-size: 22px; font-weight: 700; color: var(--md-primary, var(--accent)); min-width: 56px; }
.exam-history-score small { font-size: 12px; font-weight: 400; margin-left: 2px; }
.exam-history-main { flex: 1; display: flex; flex-direction: column; gap: 2px; font-size: 13px; }
.exam-history-main span { color: var(--text-muted); font-size: 12px; }
.exam-history-tag { font-size: 11px; color: var(--text-muted); }

/* 作答 */
.exam-paper { display: flex; flex-direction: column; gap: 14px; }
.exam-paper-head { position: sticky; top: 64px; z-index: 6; padding: 12px 16px; border-radius: 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; }
.exam-paper-title { flex: 1 1 240px; display: flex; flex-direction: column; font-size: 14px; }
.exam-paper-title span { font-size: 12px; color: var(--text-muted); }
.exam-paper-status { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.exam-progress { flex-basis: 100%; height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; }
.exam-progress span { display: block; height: 100%; background: var(--md-primary, var(--accent)); transition: width .2s; }
.exam-page-dots { flex-basis: 100%; display: flex; flex-wrap: wrap; gap: 6px; }
.exam-page-dot { width: 32px; height: 32px; border: 1px solid var(--border); background: var(--card-bg); color: var(--text-light); font-size: 12px; cursor: pointer; padding: 0; }
.exam-page-dot.done { background: color-mix(in srgb, var(--md-mastered, var(--green)) 18%, var(--card-bg)); border-color: var(--md-mastered, var(--green)); }
.exam-page-dot.current { border: 2px solid var(--md-primary, var(--accent)); color: var(--md-primary, var(--accent)); font-weight: 700; }
.exam-questions { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; counter-reset: none; }
.exam-q { background: var(--card-bg); border: 1px solid var(--border); border-radius: 16px; padding: 16px 18px; }
.exam-q.answered { border-color: color-mix(in srgb, var(--md-primary, var(--accent)) 45%, var(--border)); }
.exam-q-meta { font-size: 11.5px; color: var(--text-muted); margin-bottom: 6px; }
.exam-q-meta b { color: var(--md-primary, var(--accent)); margin-right: 4px; }
.exam-q-text { font-size: 15px; line-height: 1.7; margin: 0 0 10px; white-space: pre-wrap; }
.exam-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.exam-option { display: flex; align-items: flex-start; gap: 10px; padding: 10px 12px; border: 1.5px solid var(--border); border-radius: 12px; cursor: pointer; font-size: 14px; line-height: 1.5; background: var(--card-bg); }
.exam-option:hover { border-color: var(--md-primary, var(--accent)); }
.exam-option input { position: absolute; opacity: 0; pointer-events: none; }
.exam-option:focus-within { outline: 3px solid color-mix(in srgb, var(--md-primary, var(--accent)) 50%, transparent); }
.exam-option.chosen { border-color: var(--md-primary, var(--accent)); background: color-mix(in srgb, var(--md-primary, var(--accent)) 10%, var(--card-bg)); }
.exam-letter { flex: 0 0 24px; height: 24px; border-radius: 50%; border: 1.5px solid var(--border); display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; color: var(--text-light); }
.exam-option.chosen .exam-letter { background: var(--md-primary, var(--accent)); border-color: var(--md-primary, var(--accent)); color: #fff; }
.exam-paper-foot { display: flex; justify-content: space-between; gap: 12px; }
.exam-paper-foot .btn { min-width: 120px; padding: 10px 18px; }

/* 成绩 */
.exam-score-card { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.exam-score { width: 120px; height: 120px; border-radius: 50%; display: flex; align-items: baseline; justify-content: center; padding-top: 30px; gap: 2px; background: color-mix(in srgb, var(--md-primary, var(--accent)) 12%, transparent); color: var(--md-primary, var(--accent)); font-size: 14px; }
.exam-score-num { font-size: 44px; font-weight: 800; line-height: 1; }
.exam-score-info { flex: 1 1 280px; display: flex; flex-direction: column; gap: 6px; }
.exam-score-line { font-size: 15px; }
.exam-lit { font-size: 14px; color: var(--md-mastered, var(--green)); font-weight: 600; }
.exam-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.exam-bars { display: flex; flex-direction: column; gap: 8px; }
.exam-bar-row { display: grid; grid-template-columns: 96px 1fr 110px; align-items: center; gap: 10px; font-size: 13px; }
.exam-bar { height: 10px; border-radius: 5px; background: var(--border); overflow: hidden; }
.exam-bar span { display: block; height: 100%; background: var(--md-mastered, var(--green)); }
.exam-bar-num { color: var(--text-muted); font-size: 12px; text-align: right; }

/* 能力报告 */
.exam-report h3 + .exam-report-summary { margin-top: 0; }
.exam-report h3:not(:first-child) { margin-top: 20px; }
.exam-report-summary { font-size: 14px; line-height: 1.8; margin-bottom: 14px; }
.exam-report-subjects { display: flex; flex-direction: column; gap: 10px; }
.exam-report-subject { border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; background: var(--card-bg); font-size: 13px; line-height: 1.6; }
.exam-report-subject-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.exam-report-subject-head span { color: var(--text-muted); font-size: 12px; }
.exam-level { font-size: 11px !important; font-weight: 700; padding: 1px 8px; border-radius: 999px; background: var(--bg); }
.exam-level.good { color: var(--md-mastered, var(--green)) !important; background: color-mix(in srgb, var(--md-mastered, var(--green)) 14%, transparent); }
.exam-level.ok { color: var(--md-primary, var(--accent)) !important; background: color-mix(in srgb, var(--md-primary, var(--accent)) 12%, transparent); }
.exam-level.weak { color: var(--md-error, #ba5b4f) !important; background: color-mix(in srgb, var(--md-error, #ba5b4f) 12%, transparent); }
.exam-domains { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.exam-domain { font-size: 11.5px; padding: 2px 8px; border-radius: 999px; background: var(--bg); color: var(--text-light); }
.exam-domain.good { color: var(--md-mastered, var(--green)); }
.exam-domain.weak { color: var(--md-error, #ba5b4f); }
.exam-report-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin-top: 14px; }
.exam-report-list h4 { font-size: 13px; margin: 0 0 6px; }
.exam-report-list ul { margin: 0; padding-left: 18px; font-size: 13px; line-height: 1.7; }
.exam-advice { margin-top: 12px; font-size: 13px; line-height: 1.7; background: var(--bg); border-radius: 10px; padding: 10px 12px; }
.exam-path { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 10px; }
.exam-path-step { font-size: 13px; line-height: 1.6; }
.exam-path-step p { margin: 2px 0 0; color: var(--text-light); }
.exam-kind { font-size: 11px; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-right: 6px; }
.exam-kind.gap { color: #a0601a; background: #fbecd9; }
.exam-kind.review { color: var(--md-error, #ba5b4f); background: color-mix(in srgb, var(--md-error, #ba5b4f) 12%, transparent); }
.exam-kind.next { color: var(--md-mastered, var(--green)); background: color-mix(in srgb, var(--md-mastered, var(--green)) 14%, transparent); }
.exam-topic-link { color: var(--md-primary, var(--accent)); font-weight: 600; text-decoration: none; margin-right: 6px; }
.exam-topic-link:hover { text-decoration: underline; }
.exam-note { margin-top: 14px; }
.exam-loading::after { content: ""; display: inline-block; width: 12px; height: 12px; margin-left: 8px; border: 2px solid var(--border); border-top-color: var(--md-primary, var(--accent)); border-radius: 50%; animation: exam-spin .8s linear infinite; vertical-align: -2px; }
@keyframes exam-spin { to { transform: rotate(360deg); } }

/* 错题回顾 */
.exam-review summary { cursor: pointer; list-style: none; }
.exam-review summary h3 { display: inline; margin: 0; }
.exam-review summary::before { content: "▶ "; font-size: 11px; color: var(--text-muted); }
.exam-review[open] summary::before { content: "▼ "; }
.exam-review-list { margin: 14px 0 0; padding-left: 26px; display: flex; flex-direction: column; gap: 14px; }
.exam-review-list .exam-q-text { font-size: 14px; margin-bottom: 4px; }
.exam-review-line { font-size: 13px; margin: 2px 0; }
.exam-review-line.wrong { color: var(--md-error, #ba5b4f); }
.exam-review-line.right { color: var(--md-mastered, var(--green)); }
.exam-review-expl { font-size: 12.5px; color: var(--text-light); margin: 4px 0; line-height: 1.6; }

@media (max-width: 767px) {
  .exam-card { padding: 16px; }
  .exam-options { grid-template-columns: 1fr; }
  .exam-paper-head { top: 0; }
  .exam-bar-row { grid-template-columns: 72px 1fr 90px; }
  .exam-score { width: 96px; height: 96px; padding-top: 22px; }
  .exam-score-num { font-size: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  .exam-loading::after { animation: none; }
  .exam-progress span { transition: none; }
}