:root {
  --bg: #FDF8EE;
  --bg-soft: #F7EFE0;
  --card: #FFFFFF;
  --line: #EFE4D2;
  --line-soft: #F5ECDC;
  --text: #3B342A;
  --text-2: #7A7062;
  --text-3: #A79E8E;
  --brand: #E0972F;
  --brand-strong: #C97F1B;
  --brand-soft: #FDF3E2;
  --ok: #2E9E6B;
  --ok-soft: #EAF7F0;
  --bad: #D9605A;
  --bad-soft: #FCEEEC;
  --blue: #4A86C8;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(88, 70, 40, .05), 0 8px 24px rgba(88, 70, 40, .06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1060px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

/* ---------------- Header ---------------- */
.top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.top h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .3px;
}
.top .sub {
  margin: 4px 0 0;
  color: var(--text-2);
  font-size: 13px;
}
.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---------------- Card ---------------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 18px;
}
.card > h2 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card > h2 .tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-3);
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--brand);
  display: inline-block;
  flex: none;
}

/* ---------------- Buttons ---------------- */
.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
}
.btn:hover { border-color: var(--brand); color: var(--brand-strong); }
.btn.primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  font-weight: 600;
}
.btn.primary:hover { background: var(--brand-strong); border-color: var(--brand-strong); color: #fff; }
.btn.danger:hover { border-color: var(--bad); color: var(--bad); }
.btn.block { width: 100%; padding: 12px; font-size: 15px; border-radius: 12px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ---------------- Forms ---------------- */
label.field {
  display: block;
  margin-bottom: 14px;
}
label.field .lb {
  display: block;
  font-size: 13px;
  color: var(--text-2);
  margin-bottom: 6px;
}
input[type="text"], textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #FFFDF8;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input[type="text"]:focus, textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(224, 151, 47, .14);
  background: #fff;
}

/* ---------------- Question list (student) ---------------- */
.q-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 12px;
  background: #FFFDF8;
}
.q-item.is-right { border-color: rgba(46,158,107,.45); background: var(--ok-soft); }
.q-item.is-wrong { border-color: rgba(217,96,90,.4); background: var(--bad-soft); }
.q-head {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 8px;
}
.q-no {
  flex: none;
  width: 24px; height: 24px;
  border-radius: 7px;
  background: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.q-stem { font-size: 15px; }
.q-hint { font-size: 12px; color: var(--text-3); margin-top: 6px; }
.q-flag { margin-left: auto; font-size: 12px; font-weight: 600; flex: none; }
.q-flag.ok { color: var(--ok); }
.q-flag.bad { color: var(--bad); }
.q-answer-line { margin-top: 8px; font-size: 13px; color: var(--text-2); }
.q-answer-line b { color: var(--ok); }

/* ---------------- Result panel ---------------- */
.result {
  border-radius: var(--radius);
  padding: 18px;
  background: var(--brand-soft);
  border: 1px solid #F0DCB8;
  margin-bottom: 18px;
  display: none;
}
.result.show { display: block; }
.result .score-line {
  font-size: 15px;
  margin-bottom: 4px;
}
.result .score-line b { font-size: 26px; color: var(--brand-strong); }
.result .meta { font-size: 13px; color: var(--text-2); }

/* ---------------- Stats grid ---------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 16px;
}
.stat .k { font-size: 12px; color: var(--text-2); }
.stat .v { font-size: 26px; font-weight: 700; line-height: 1.25; margin-top: 2px; }
.stat .v small { font-size: 13px; font-weight: 500; color: var(--text-3); margin-left: 2px; }
.stat .x { font-size: 12px; color: var(--text-3); }

@media (max-width: 720px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  #two-col { grid-template-columns: 1fr !important; }
  .wrap { padding: 18px 14px 48px; }
  .card { padding: 16px; }
}

/* ---------------- Rank ---------------- */
.rank-list { list-style: none; margin: 0; padding: 0; }
.rank-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 10px;
  border-radius: 10px;
}
.rank-list li:nth-child(odd) { background: #FBF7EE; }
.rank-list li.top1 .rk { background: #E0972F; color: #fff; }
.rank-list li.top2 .rk { background: #B9BEC7; color: #fff; }
.rank-list li.top3 .rk { background: #C89A63; color: #fff; }
.rk {
  flex: none;
  width: 24px; height: 24px;
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text-2);
  font-size: 12px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.rk-name { flex: 1; font-weight: 600; }
.rk-score { font-variant-numeric: tabular-nums; color: var(--text-2); font-size: 13px; }
.rk-score b { color: var(--brand-strong); font-size: 15px; }

/* ---------------- Bar ---------------- */
.bar-row { margin-bottom: 14px; }
.bar-row:last-child { margin-bottom: 0; }
.bar-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 13px;
  margin-bottom: 6px;
  gap: 10px;
}
.bar-top .name { font-weight: 600; }
.bar-top .num { color: var(--text-2); font-variant-numeric: tabular-nums; flex: none; }
.bar {
  height: 9px;
  background: var(--bg-soft);
  border-radius: 6px;
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  border-radius: 6px;
  background: var(--brand);
  transition: width .4s ease;
}
.bar > i.good { background: var(--ok); }
.bar > i.mid { background: var(--brand); }
.bar > i.low { background: var(--bad); }
.level {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bg-soft);
  color: var(--text-2);
  flex: none;
}
.level.lv-已掌握 { background: var(--ok-soft); color: var(--ok); }
.level.lv-基本掌握 { background: var(--brand-soft); color: var(--brand-strong); }
.level.lv-待巩固 { background: #FFF6E5; color: #C97F1B; }
.level.lv-薄弱 { background: var(--bad-soft); color: var(--bad); }

/* ---------------- Question analysis ---------------- */
.qa {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 12px;
}
.qa:last-child { margin-bottom: 0; }
.qa-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.qa-stem { font-size: 14px; }
.qa-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--text-2);
  margin-top: 8px;
}
.qa-meta b { color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 20px;
  background: var(--bad-soft);
  color: var(--bad);
  border: 1px solid rgba(217,96,90,.2);
}
.chip small { color: #A97571; margin-left: 4px; }
.chip.ok { background: var(--ok-soft); color: var(--ok); border-color: rgba(46,158,107,.2); }
.chip-empty { font-size: 12.5px; color: var(--ok); }

/* ---------------- 需重讲的题 ---------------- */
.dot.warn { background: var(--bad); }
.diff-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: 11px;
  background: var(--bad-soft);
  border: 1px solid rgba(217,96,90,.18);
  margin-bottom: 8px;
}
.diff-row:last-child { margin-bottom: 0; }
.diff-no {
  flex: none;
  width: 26px; height: 26px;
  border-radius: 8px;
  background: var(--bad);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.diff-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.diff-ans { font-weight: 700; color: #A8403B; }
.diff-meta { font-size: 12px; color: #9C6B67; }
.diff-meta b { color: #A8403B; }
.diff-pct {
  flex: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--bad);
  font-variant-numeric: tabular-nums;
}

/* 逐题分析里的困难题标记 */
.qa.is-diff { border-color: rgba(217,96,90,.35); background: #FFFCFB; }
.diff-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bad-soft);
  color: var(--bad);
  border: 1px solid rgba(217,96,90,.22);
  flex: none;
}
.dist {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-2);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.dist-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border-radius: 20px;
  background: #FFF6E5;
  border: 1px solid #F3E0BC;
  color: #A9752B;
}
.dist-item b { color: var(--brand-strong); }

/* ---------------- Table ---------------- */
.tbl-wrap { overflow-x: auto; }
table.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.tbl th, table.tbl td {
  padding: 9px 10px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}
table.tbl th { color: var(--text-2); font-weight: 600; background: #FBF7EE; }
table.tbl tr:last-child td { border-bottom: none; }
.mini {
  display: inline-block;
  min-width: 18px; height: 18px;
  line-height: 18px;
  text-align: center;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  margin-right: 3px;
}
.mini.ok { background: var(--ok-soft); color: var(--ok); }
.mini.bad { background: var(--bad-soft); color: var(--bad); }

/* ---------------- Misc ---------------- */
.live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-2);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 5px 12px;
}
.pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  animation: pulse 1.6s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(46,158,107,.5); }
  70% { box-shadow: 0 0 0 6px rgba(46,158,107,0); }
  100% { box-shadow: 0 0 0 0 rgba(46,158,107,0); }
}
.empty {
  text-align: center;
  color: var(--text-3);
  padding: 28px 10px;
  font-size: 14px;
}
.empty b { display: block; color: var(--text-2); font-size: 15px; margin-bottom: 4px; }
.link-box {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 10px 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.link-box code {
  flex: 1;
  min-width: 200px;
  font-size: 13px;
  color: var(--brand-strong);
  word-break: break-all;
}
.foot {
  text-align: center;
  color: var(--text-3);
  font-size: 12px;
  margin-top: 8px;
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%) translateY(12px);
  background: rgba(59,52,42,.94);
  color: #fff;
  padding: 9px 18px;
  border-radius: 22px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: all .22s ease;
  z-index: 99;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }