[hidden] { display: none !important; }
:root {
  --bg: #f6f7f9; --fg: #1d2330; --muted: #6b7385; --card: #fff; --line: #dfe3ea;
  --primary: #1f5fd1; --ok: #1a7f46; --warn: #a96500; --bad: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171d; --fg: #e6e9ef; --muted: #98a1b3; --card: #1c2028; --line: #2c323d;
          --primary: #6c9cff; --ok: #4cc38a; --warn: #f0a83a; --bad: #ff6b5f; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 1280px; margin: 0 auto; padding: 16px; }
a { color: var(--primary); }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }
.top { display: flex; gap: 12px; align-items: center; justify-content: space-between; padding: 10px 16px;
       border-bottom: 1px solid var(--line); background: var(--card); flex-wrap: wrap; }
.brand { font-weight: 700; text-decoration: none; color: var(--fg); }
.who a { margin-left: 8px; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin: 0 0 16px; }
.card.narrow { max-width: 640px; margin: 40px auto; }
.card.bad { border-color: var(--bad); } .card.warn { border-color: var(--warn); }
.banner { background: var(--warn); color: #fff; padding: 8px 16px; display: flex; gap: 12px; align-items: center; }
.bar { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); font-size: 12px; }
.badge.ok { border-color: var(--ok); color: var(--ok); } .badge.warn { border-color: var(--warn); color: var(--warn); }
.badge.bad { border-color: var(--bad); color: var(--bad); }
.btn, button { display: inline-block; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line);
               background: var(--card); color: var(--fg); cursor: pointer; text-decoration: none; font: inherit; }
.btn.primary, button.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
button.warn { border-color: var(--warn); color: var(--warn); } button.bad { border-color: var(--bad); color: var(--bad); }
button.armed { background: var(--bad); color: #fff; }
button:disabled { opacity: .5; cursor: not-allowed; }
input, select, textarea { font: inherit; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px;
                          background: var(--bg); color: var(--fg); max-width: 100%; }
textarea { width: 100%; margin: 8px 0; }
.seats { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; margin-bottom: 16px; }
.seat { background: var(--card); border: 1px solid var(--line); border-left-width: 6px; border-radius: 10px; padding: 12px; }
.seat header { display: flex; gap: 8px; align-items: center; }
.seat .note { color: var(--muted); font-size: 13px; word-break: break-word; }
.seat .actions { display: flex; flex-wrap: wrap; gap: 6px; }
.seat .actions form { margin: 0; }
.seat form.assign { display: grid; gap: 6px; width: 100%; }
.state-empty { border-left-color: var(--line); } .state-ready { border-left-color: var(--primary); }
.state-running { border-left-color: var(--ok); } .state-sealed, .state-collecting { border-left-color: var(--warn); }
.state-collected { border-left-color: #7a5af8; } .state-blocked { border-left-color: var(--bad); }
.state-loading, .state-resetting { border-left-color: var(--muted); }
.timer { margin-left: auto; font-variant-numeric: tabular-nums; color: var(--muted); }
form.inline { display: inline-flex; gap: 4px; align-items: center; margin: 0; }
.filters { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; flex-wrap: wrap; }
table.list { width: 100%; border-collapse: collapse; }
table.list th, table.list td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.list tr.group td { background: var(--bg); }
.row-actions { white-space: nowrap; }
pre.out { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px; overflow: auto; max-height: 480px; white-space: pre-wrap; }
ul.hints li { margin: 4px 0; }
@media (max-width: 640px) { .row-actions { white-space: normal; } table.list { font-size: 13px; } }
/* grade sheet */
.item-head { display: flex; align-items: baseline; gap: 12px; justify-content: space-between; }
.item-head h2 { margin: 0; font-size: 18px; }
.sub { font-variant-numeric: tabular-nums; white-space: nowrap; }
ul.crit { list-style: none; padding: 0; margin: 8px 0 0; }
ul.crit li { padding: 8px 0; border-top: 1px solid var(--line); }
label.check { display: grid; grid-template-columns: 28px 64px 1fr; gap: 8px; align-items: start; cursor: pointer; }
label.check input { width: 22px; height: 22px; margin: 0; }
.pts { display: inline-block; min-width: 48px; text-align: center; font-size: 12px; font-weight: 600;
       border: 1px solid var(--line); border-radius: 999px; padding: 1px 6px; }
label.check.flag .pts { border-color: var(--bad); color: var(--bad); }
.marked-by { display: block; margin-left: 100px; font-size: 12px; color: var(--muted); }
.part { border-top: 1px dashed var(--line); padding-top: 8px; margin-top: 8px; }
.part h3 { margin: 6px 0; font-size: 16px; display: flex; gap: 10px; align-items: baseline; }
.prompt { margin: 4px 0; }
.levels, .variants { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 6px 0; }
.pill { border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; cursor: pointer; }
.pill input { margin-right: 4px; }
.sheet-total { position: sticky; bottom: 0; display: flex; gap: 16px; align-items: center; justify-content: flex-end;
               background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px;
               margin-bottom: 16px; box-shadow: 0 -4px 12px rgba(0,0,0,.06); flex-wrap: wrap; }
.sheet-total #raw { font-size: 20px; }
@media (max-width: 640px) { label.check { grid-template-columns: 28px 56px 1fr; } .marked-by { margin-left: 0; } }
/* admin bar pin, seat phase */
.pin { font-size: 13px; }
.phase-line { margin: 6px 0; font-size: 14px; display: flex; flex-wrap: wrap; gap: 6px; align-items: baseline; }
.phase-line .timer { margin-left: 0; }
.seat form.phase-form { display: flex; flex-wrap: wrap; gap: 4px; margin: 0; max-width: 100%; }
.seat form.phase-form select { min-width: 0; max-width: 100%; flex: 1 1 120px; }
.phase-actions { margin-bottom: 6px; }
.scenario p { margin: 0; }
.timer.over { color: var(--bad); font-weight: 600; }
/* student brief */
.brief h2 { margin-top: 0; }
.now { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
       border: 1px solid var(--primary); border-radius: 10px; padding: 10px 14px; margin: 12px 0; }
.now.with-ta { border-color: var(--ok); }
.timer.big { font-size: 28px; font-weight: 700; color: var(--fg); margin-left: 0; }
.timer.big.over { color: var(--bad); }
.scenario { border-left: 4px solid var(--warn); background: var(--bg); padding: 8px 12px; border-radius: 6px; margin: 12px 0; }
.scenario h3 { margin: 0 0 4px; font-size: 16px; }
ol.phases { padding-left: 20px; }
ol.phases li.phase { margin: 10px 0; }
ol.phases li.phase h3 { font-size: 16px; margin: 0 0 4px; display: flex; flex-wrap: wrap; gap: 6px; align-items: baseline; }
ol.phases li.past { opacity: .65; }
ol.phases li.current { border-left: 3px solid var(--primary); padding-left: 8px; }
ul.cards li { margin: 4px 0; }
ul.hints code { overflow-wrap: anywhere; }