:root{--bg:#0f1221;--panel:#171a2e;--ink:#1f2340;--text:#e8eaf6;--muted:#9aa0c3;--brand:#5b7cff;
  --ok:#28c08a;--partial:#e9b949;--wrong:#ef5f6b;--unclear:#9aa0c3;--line:#262a4a}
*{box-sizing:border-box}
body{margin:0;display:flex;min-height:100vh;font:15px/1.5 system-ui,Segoe UI,Roboto,Arial;
  background:var(--bg);color:var(--text)}
.nav{width:230px;flex:0 0 230px;background:var(--panel);border-right:1px solid var(--line);
  padding:20px 14px;display:flex;flex-direction:column;gap:18px;position:sticky;top:0;height:100vh}
.brand{font-size:20px;font-weight:700}.brand small{color:var(--muted);font-weight:400}
.logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--brand);
  color:#fff;font-size:13px;font-weight:700;margin-right:6px}
.nav nav{display:flex;flex-direction:column;gap:4px}
.nav a{color:var(--text);text-decoration:none;padding:9px 12px;border-radius:9px}
.nav a:hover{background:var(--ink)}
.mode{margin-top:auto;font-size:12px;padding:8px 10px;border-radius:8px;text-align:center}
.mode.demo{background:#3a2f12;color:#e9b949}.mode.live{background:#123a2c;color:#28c08a}
.content{flex:1;padding:32px 40px;max-width:1000px}
h1{margin:0 0 6px}h2{margin:28px 0 10px;font-size:18px}
.lead{color:var(--muted);margin:0 0 20px;max-width:70ch}
.muted{color:var(--muted)}.ok{color:var(--ok)}.warn{background:#3a2f12;color:#e9b949;padding:10px 14px;border-radius:10px}
a{color:var(--brand)}
.cards{display:flex;gap:14px;flex-wrap:wrap;margin:18px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 22px;min-width:110px}
.card .n{font-size:28px;font-weight:700}
.flow{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap;margin:12px 0}
.step{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;flex:1;min-width:150px}
.step p{color:var(--muted);font-size:13px;margin:6px 0 0}
.arrow{display:grid;place-items:center;color:var(--brand);font-size:20px}
.tbl{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.tbl th{background:var(--ink);color:var(--muted);font-weight:600}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0 20px}
.row.grade select,.row.grade input{min-width:200px}
input,select,button{font:inherit;padding:9px 12px;border-radius:9px;border:1px solid var(--line);
  background:var(--ink);color:var(--text)}
button{background:var(--brand);border-color:var(--brand);color:#fff;cursor:pointer;font-weight:600}
button:hover{filter:brightness(1.07)}
.inline{display:inline-flex;gap:6px;align-items:center;margin:0}
.chk{display:flex;gap:6px;align-items:center;color:var(--muted)}
.report-head{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.score{text-align:center;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 24px}
.score .big{font-size:30px;font-weight:700}
.pills{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
.pill{padding:5px 12px;border-radius:999px;font-size:13px;background:var(--ink)}
.pill.ok{background:#123a2c;color:var(--ok)}.pill.partial{background:#3a330f;color:var(--partial)}
.pill.wrong{background:#3a1820;color:var(--wrong)}
.q{background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0}
.q.correct{border-left-color:var(--ok)}.q.partial{border-left-color:var(--partial)}
.q.wrong{border-left-color:var(--wrong)}.q.unclear{border-left-color:var(--unclear)}
.q-head{display:flex;gap:12px;align-items:center}
.q-head .v{text-transform:uppercase;font-size:11px;letter-spacing:.04em;color:var(--muted)}
.q-head .marks{margin-left:auto;font-weight:700}
.q-body{margin-top:8px;display:flex;flex-direction:column;gap:4px;font-size:14px}
.q-body .lbl{display:inline-block;min-width:72px;color:var(--muted);font-size:12px}
.q-body .fix{color:var(--partial)}
.actions{display:flex;gap:12px;align-items:center;margin:24px 0}
.btn-link{display:inline-block;padding:9px 14px;border:1px solid var(--line);border-radius:9px;text-decoration:none}
.code{font-family:ui-monospace,Menlo,Consolas,monospace;background:var(--ink);border:1px solid var(--line);
  padding:3px 9px;border-radius:7px;letter-spacing:.06em;font-weight:700}
.grade-tag{padding:2px 9px;border-radius:7px;font-weight:700;background:var(--ink)}
.grade-A{color:var(--ok)}.grade-B{color:#7fd1ff}.grade-C{color:var(--partial)}.grade-D,.grade-F{color:var(--wrong)}
.edit-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
.edit-grid label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted)}
.edit-grid .full{grid-column:1/-1}
.edit-grid .small{grid-column:1/-1;font-size:12px;color:var(--muted)}
.edit-grid input,.edit-grid select,.edit-grid textarea{width:100%;font:inherit}
.edit-grid textarea{resize:vertical}
.edit-grid .inline-marks{display:flex;align-items:center;gap:8px}
.edit-grid .inline-marks input{width:90px}
.snip{margin:8px 0 4px;max-width:520px}
.snip img{max-width:100%;border-radius:8px;border:1px solid var(--line);background:#fff;display:block}
.snip figcaption{color:var(--muted);font-size:12px;margin-top:4px}
@media print{.nav{display:none}.content{max-width:none}.actions{display:none}.snip{max-width:360px}}
@media(max-width:720px){body{flex-direction:column}.nav{width:auto;height:auto;position:static;flex-direction:row;flex-wrap:wrap}}