:root{
  --navy:#153c5a; --ink:#1d2730; --muted:#637180; --line:#d7dfe6;
  --paper:#fff; --bg:#eef2f5; --red:#a62b32; --amber:#9a6500; --green:#2c6a48;
  --tint:#f4f7f9;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;line-height:1.6}
a{color:var(--navy)}

/* ---------- top bar ---------- */
.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.97);
  border-bottom:1px solid var(--line);padding:14px 20px}
.top h1{margin:0;font-size:21px}
.top .sub{margin:4px 0 0;color:var(--muted);font-size:13px}
.top-row{display:flex;gap:12px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap}
.controls{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;align-items:center}
.controls input[type=search]{min-width:230px;padding:8px 11px;border:1px solid #adb9c3;border-radius:8px;font:inherit}
.controls label{display:flex;align-items:center;gap:5px;font-size:13px;color:var(--muted)}
.btn{padding:8px 13px;border:0;border-radius:8px;background:var(--navy);color:#fff;
  text-decoration:none;cursor:pointer;font:inherit;display:inline-block}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--navy)}
.progress{font-size:13px;color:var(--muted)}
.progress b{color:var(--navy)}

/* ---------- index ---------- */
main{max-width:1450px;margin:20px auto;padding:0 18px 80px}
.lede{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:18px}
.lede h2{margin:0 0 8px;font-size:18px;color:var(--navy)}
.lede p{margin:6px 0;font-size:14px}
.lede ol{margin:8px 0 0;padding-left:20px;font-size:14px}
.lede li{margin:5px 0}
.index-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.index-card{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:18px;text-decoration:none;color:var(--ink);box-shadow:0 2px 8px rgba(20,48,70,.06)}
.index-card:hover{border-color:var(--navy);box-shadow:0 4px 14px rgba(20,48,70,.13)}
.index-card h2{margin:0 0 4px;color:var(--navy);font-size:22px}
.index-card .who{margin:0 0 10px;color:var(--muted);font-size:14px}
.index-card .meta{margin:0;color:var(--muted);font-size:13px}

/* ---------- layout with student sidebar ---------- */
.layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:20px;align-items:start}
.content{min-width:0}
.side{position:sticky;top:118px;max-height:calc(100vh - 140px);display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 10px;
  box-shadow:0 2px 8px rgba(20,48,70,.06)}
.side-title{margin:0 0 8px;padding:0 4px;font-size:13px;font-weight:700;color:var(--navy)}
.roster{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain}
.roster-item{display:flex;align-items:center;gap:8px;width:100%;padding:7px 8px;margin:1px 0;
  border:0;border-radius:7px;background:transparent;font:inherit;font-size:13.5px;color:var(--ink);
  text-align:left;cursor:pointer}
.roster-item:hover{background:#eef4f9}
.roster-item.current{background:#dfeaf4;font-weight:700}
.roster-no{flex:0 0 22px;color:var(--muted);font-size:12px;text-align:right}
.roster-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dot{flex:0 0 9px;width:9px;height:9px;border-radius:50%;background:#cdd7df;display:inline-block}
.roster-item.done .dot{background:var(--green)}
.roster-item.part .dot{background:#d39824}
.roster-item.queried .dot{background:var(--red)}
.side-key{margin:9px 0 0;padding:8px 4px 0;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:4px;font-size:11.5px;color:var(--muted)}
.side-key span{display:flex;align-items:center;gap:6px}
.side-key i{flex:0 0 9px;width:9px;height:9px;border-radius:50%;display:inline-block}
.side-key i.done{background:var(--green)}
.side-key i.part{background:#d39824}
.side-key i.queried{background:var(--red)}

/* ---------- student ---------- */
.student{background:var(--paper);border:1px solid var(--line);border-radius:14px;
  margin:16px 0;padding:16px 18px;box-shadow:0 2px 9px rgba(20,48,70,.07);scroll-margin-top:130px}
.student.done{border-left:6px solid var(--green)}
.student.queried{border-left:6px solid var(--red)}
.student-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;
  border-bottom:2px solid var(--navy);padding-bottom:10px;flex-wrap:wrap}
.student-head h2{margin:0;font-size:22px}
.student-head .sub{margin:3px 0 0;color:var(--muted);font-size:13px}
.chips{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.chip{background:#e7f0f7;color:#174a70;border-radius:999px;padding:6px 11px;font-size:13px}
.chip b{font-size:15px}

/* ---------- question ---------- */
.q{border:1px solid var(--line);border-radius:11px;padding:13px;background:#fbfcfd;margin-top:13px}
.q-head{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
.q-head h3{margin:0;font-size:17px;color:var(--navy)}
.q-head .hint{margin:3px 0 0;color:var(--muted);font-size:12px}
.q-mark{font-size:29px;font-weight:800;color:var(--navy);white-space:nowrap}
.q-mark small{font-size:13px;color:var(--muted);font-weight:400}
.parts{display:flex;gap:7px;flex-wrap:wrap;margin:9px 0}
.parts span{background:#edf2f6;border-radius:7px;padding:5px 9px;font-size:12px}
.note{margin:8px 0;padding:8px 11px;border-left:4px solid #d39824;background:#fff7e8;
  color:#67460c;font-size:13px}
.fb{margin:9px 0}
.fb-line{display:grid;grid-template-columns:78px 1fr;gap:9px;margin:7px 0;padding:8px 11px;
  background:#fff5f5;border-left:4px solid var(--red)}
.fb-line span{font-size:12px;font-weight:700;color:var(--red)}
.fb-line p{margin:0;font-size:14px}
details{border-top:1px solid var(--line);padding-top:8px;margin-top:8px}
summary{cursor:pointer;font-weight:700;color:var(--navy);font-size:13px}
.reason{background:var(--tint);padding:8px 11px;border-radius:7px;margin:6px 0}
.reason strong{font-size:12px;color:var(--navy)}
.reason p{margin:4px 0 0;font-size:13px}

/* ---------- scan / transcript pair ---------- */
.pair{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(340px,.85fr);gap:12px;
  margin-top:12px;align-items:stretch}
.pane{min-width:0;height:clamp(440px,70vh,800px);display:flex;flex-direction:column;
  border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.pane-title{flex:0 0 auto;margin:0;padding:9px 12px;background:#eaf1f7;color:var(--navy);font-size:14px;font-weight:700}
.pane-scroll{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable;padding:9px}
figure{margin:0 0 10px;padding:8px;border:1px solid var(--line);border-radius:9px;background:#fff}
figcaption{font-size:12px;font-weight:700;color:var(--navy);margin-bottom:7px}
figure img{display:block;width:100%;height:auto;border:1px solid #cbd5dd;border-radius:5px;
  background:#fff;cursor:zoom-in}
.missing{min-height:130px;display:flex;align-items:center;justify-content:center;padding:14px;
  text-align:center;color:#704a08;background:#fff7e8;border:2px dashed #d39824;border-radius:6px;font-size:13px}
.tx{padding:2px 4px 12px;border-bottom:1px solid var(--line)}
.tx:last-child{border-bottom:0}
.tx h5{margin:0 0 6px;color:var(--navy);font-size:13px}
.tx pre{margin:0;white-space:pre-wrap;word-break:break-word;background:var(--tint);
  padding:11px;border-radius:8px;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:14px}

/* ---------- review controls ---------- */
.review{margin-top:12px;border:1px solid #c3d2dd;border-radius:10px;background:#f7fbfd;padding:11px 13px}
.review-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.review-row label{display:flex;align-items:center;gap:7px;font-size:14px;cursor:pointer}
.review-row input[type=checkbox]{width:18px;height:18px;cursor:pointer}
.review-row .save-state{margin-left:auto;font-size:12px;color:var(--muted)}
.review-row .save-state.ok{color:var(--green)}
.review-row .save-state.err{color:var(--red)}
.query-box{margin-top:10px;padding-top:10px;border-top:1px dashed #b9cbd8}
.query-box.hidden{display:none}
.query-grid{display:grid;grid-template-columns:170px 1fr;gap:10px;align-items:start}
.query-grid label{font-size:13px;color:var(--muted);padding-top:8px}
.query-grid input,.query-grid textarea{width:100%;padding:8px 10px;border:1px solid #adb9c3;
  border-radius:7px;font:inherit;font-size:14px}
.query-grid textarea{min-height:64px;resize:vertical}

/* ---------- summary page (Kyle only) ---------- */
.pill{display:inline-block;background:#e7f0f7;color:#174a70;border-radius:999px;
  padding:3px 10px;font-size:13px;font-weight:400;vertical-align:middle}
.prog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:10px}
.prog-card{border:1px solid var(--line);border-radius:10px;padding:12px 13px;background:var(--tint)}
.prog-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.prog-head b{font-size:17px;color:var(--navy)}
.prog-who{font-size:12.5px;color:var(--muted)}
.bar{height:8px;border-radius:99px;background:#dde5eb;margin:9px 0 7px;overflow:hidden}
.bar-fill{height:100%;background:var(--green);border-radius:99px;transition:width .3s}
.prog-meta{margin:2px 0;font-size:12.5px;color:var(--muted)}
.prog-meta b{color:var(--navy)}
.prog-meta b.q{color:var(--red)}
.case{border:1px solid var(--line);border-left:5px solid var(--red);border-radius:10px;
  padding:13px 15px;margin:11px 0;background:#fff}
.case.resolved{border-left-color:var(--green);opacity:.62}
.case-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;flex-wrap:wrap}
.case-head h3{margin:0;font-size:16.5px;color:var(--navy)}
.case-head .sub{margin:3px 0 0;font-size:12.5px;color:var(--muted)}
.case-marks{display:flex;gap:7px;flex-wrap:wrap}
.mk{background:#eef3f7;border-radius:8px;padding:5px 10px;font-size:13px;white-space:nowrap}
.mk.pro{background:#fdeceb;color:#7d2027}
.case-said{margin:10px 0 0;padding:10px 12px;background:var(--tint);border-radius:8px;
  font-size:14px;white-space:pre-wrap}
.case-actions{display:flex;align-items:center;gap:14px;margin-top:11px;flex-wrap:wrap}
.case-done{display:flex;align-items:center;gap:7px;font-size:14px;cursor:pointer}
.case-done input{width:17px;height:17px;cursor:pointer}
.q-hit{outline:3px solid #d39824;outline-offset:3px;border-radius:11px}

/* ---------- lightbox ---------- */
dialog.lightbox{width:96vw;height:94vh;max-width:none;max-height:none;padding:0;border:0;
  border-radius:10px;background:#17212a;overflow:auto}
dialog.lightbox::backdrop{background:rgba(0,0,0,.82)}
.lb-bar{position:sticky;top:0;z-index:2;display:flex;justify-content:space-between;align-items:center;
  gap:10px;padding:9px 12px;background:#fff;border-bottom:1px solid var(--line)}
.lb-bar span{font-size:13px;color:var(--muted)}
.lb-img{display:block;max-width:none;margin:12px auto;background:#fff}

.hidden{display:none!important}
.foot{text-align:center;color:var(--muted);font-size:12px;margin:30px 0}

@media(max-width:1050px){
  .layout{grid-template-columns:1fr}
  .side{position:static;max-height:none;margin-bottom:14px}
  .roster{max-height:190px}
  .side-key{flex-direction:row;flex-wrap:wrap;gap:12px}
  .pair{grid-template-columns:1fr}
  .pane{height:auto}
  .pane-scroll{overflow:visible}
  .index-grid{grid-template-columns:1fr}
  .top{position:static}
  .query-grid{grid-template-columns:1fr}
  .query-grid label{padding-top:0}
}
@media print{
  body{background:#fff}
  .top,.controls,.review,dialog,.side{display:none}
  .layout{grid-template-columns:1fr}
  .student{box-shadow:none;break-before:page}
  .pair{grid-template-columns:1fr}
  .pane{height:auto;overflow:visible}
  .pane-scroll{overflow:visible}
}