:root{--bg:#f4f6f9;--panel:#fff;--ink:#16202b;--muted:#637080;--line:#dfe5ec;--brand:#1e5aa8;--brand-dark:#12457f;--brand-soft:#e8f0fa;--ok:#1f8a4c;--ok-soft:#e6f5ec;--warn:#b86e00;--warn-soft:#fff4e0;--bad:#c0392b;--bad-soft:#fdecea;--mono:"Cascadia Mono", Consolas, "Courier New", monospace;--radius:8px}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--ink);margin:0;font:14px/1.5 Segoe UI,system-ui,-apple-system,Arial,sans-serif}h1,h2,h3{margin:0 0 .5em;line-height:1.25}h1{font-size:22px}h2{font-size:17px}h3{font-size:15px}p{margin:0 0 .75em}code{font-family:var(--mono);background:var(--brand-soft);border-radius:4px;padding:1px 5px;font-size:.92em}.muted{color:var(--muted)}.small{font-size:12px}.row{align-items:center;gap:8px;display:flex}.row.wrap{flex-wrap:wrap}.spacer{flex:1}.snippet{color:#d7e2ee;font-family:var(--mono);background:#0f1720;border-radius:6px;padding:10px 12px;font-size:12.5px;overflow-x:auto}button,.btn{font:inherit;cursor:pointer;border:1px solid var(--brand);background:var(--brand);color:#fff;border-radius:6px;padding:8px 16px;font-weight:600;transition:background .12s,opacity .12s}button:hover:not(:disabled){background:var(--brand-dark)}button:disabled{opacity:.5;cursor:not-allowed}button.ghost{color:var(--brand);background:0 0}button.ghost:hover:not(:disabled){background:var(--brand-soft)}button.danger{background:var(--bad);border-color:var(--bad)}button.danger:hover:not(:disabled){background:#a33024}button.success{background:var(--ok);border-color:var(--ok)}button.sm{padding:4px 10px;font-size:12.5px}button.lg{padding:11px 26px;font-size:15px}input,textarea,select{font:inherit;color:var(--ink);border:1px solid var(--line);background:#fff;border-radius:6px;width:100%;padding:8px 10px}input:focus,textarea:focus,select:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}label{margin:12px 0 4px;font-size:13px;font-weight:600;display:block}.error{color:var(--bad);background:var(--bad-soft);border-radius:6px;margin:10px 0;padding:8px 10px;font-size:13px}.center-page{place-items:center;min-height:100%;padding:24px;display:grid}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 1px 3px #1018280d}.card.narrow{width:min(420px,100%)}.card.wide{width:min(760px,100%)}.brand-mark{letter-spacing:.18em;text-transform:uppercase;color:var(--brand);margin-bottom:6px;font-size:11px;font-weight:700}.badge{color:var(--muted);white-space:nowrap;background:#eef1f4;border-radius:999px;padding:2px 8px;font-size:11.5px;font-weight:600;display:inline-block}.badge.in_progress{background:var(--brand-soft);color:var(--brand-dark)}.badge.submitted{background:var(--ok-soft);color:var(--ok)}.badge.blocked{background:var(--bad-soft);color:var(--bad)}.badge.not_started{color:var(--muted);background:#eef1f4}.badge.paused{background:var(--warn-soft);color:var(--warn)}.badge.banned{color:#fff;background:#4a1010}.rules{margin:12px 0 18px;padding-left:18px}.rules li{margin:5px 0}.exam{-webkit-user-select:none;user-select:none;grid-template-rows:auto 1fr;height:100%;display:grid}.exam-top{background:var(--panel);border-bottom:1px solid var(--line);align-items:center;gap:14px;padding:10px 18px;display:flex}.exam-top .title{font-weight:700}.timer{font-family:var(--mono);background:var(--brand-soft);color:var(--brand-dark);border-radius:6px;padding:3px 12px;font-size:20px;font-weight:700}.timer.warn{background:var(--warn-soft);color:var(--warn)}.timer.crit{background:var(--bad-soft);color:var(--bad);animation:1s infinite pulse}@keyframes pulse{50%{opacity:.55}}.flags{color:var(--muted);font-size:12.5px;font-weight:600}.flags.hot{color:var(--bad)}.save-state{color:var(--muted);font-size:12px}.save-state.offline{color:var(--warn);font-weight:600}.exam-body{grid-template-columns:220px 1fr;min-height:0;display:grid}.palette{border-right:1px solid var(--line);background:var(--panel);padding:14px;overflow-y:auto}.palette h3{text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:10px 0 8px;font-size:12px}.palette-grid{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.palette-grid button{height:32px;color:var(--ink);border:1px solid var(--line);background:#fff;padding:0;font-size:12.5px}.palette-grid button.answered{background:var(--ok-soft);color:var(--ok);border-color:#9fd3b3}.palette-grid button.current{outline:2px solid var(--brand);outline-offset:1px}.palette-grid button:hover:not(:disabled){background:var(--brand-soft)}.legend{color:var(--muted);gap:4px;margin-top:14px;font-size:11.5px;display:grid}.legend i{vertical-align:-1px;border:1px solid var(--line);border-radius:2px;width:10px;height:10px;margin-right:6px;display:inline-block}.question-pane{padding:22px 28px 90px;overflow-y:auto}.q-head{align-items:baseline;gap:10px;margin-bottom:8px;display:flex}.q-num{color:var(--brand);font-weight:700}.q-body{white-space:pre-wrap;margin-bottom:18px;font-size:15px}.options{gap:8px;max-width:760px;display:grid}.option{text-align:left;color:var(--ink);border:1px solid var(--line);background:#fff;border-radius:7px;align-items:flex-start;gap:12px;padding:11px 14px;font-weight:400;display:flex}.option:hover:not(:disabled){background:var(--brand-soft);border-color:#b9cfea}.option.selected{background:var(--brand-soft);border-color:var(--brand);box-shadow:inset 3px 0 0 var(--brand)}.option .letter{color:var(--brand);min-width:18px;font-weight:700}.q-nav{gap:8px;margin-top:22px;display:flex}.coding{gap:10px;display:grid}.code-toolbar{align-items:center;gap:8px;display:flex}.code-toolbar select{width:auto;padding:5px 8px}.editor{background:#0f1720;border:1px solid #243140;border-radius:7px;grid-template-columns:44px 1fr;height:320px;display:grid;overflow:hidden}.editor .gutter{color:#5b6b7d;font:13px/1.55 var(--mono);text-align:right;white-space:pre;-webkit-user-select:none;user-select:none;background:#141e29;padding:10px 8px;overflow:hidden}.editor textarea{resize:none;color:#e3ebf3;height:100%;font:13px/1.55 var(--mono);white-space:pre;tab-size:4;-webkit-user-select:text;user-select:text;background:0 0;border:0;border-radius:0;padding:10px 12px;overflow:auto}.editor textarea:focus{outline:none}.terminal{color:#cfe3d2;font:12.5px/1.5 var(--mono);background:#0b1117;border:1px solid #243140;border-radius:7px}.terminal .term-head{color:#7f93a8;border-bottom:1px solid #1d2935;align-items:center;gap:8px;padding:6px 10px;font-size:11.5px;display:flex}.terminal pre{white-space:pre-wrap;min-height:90px;max-height:200px;margin:0;padding:10px 12px;overflow:auto}.terminal .stderr{color:#ff8f80}.terminal textarea{color:#cfe3d2;font:12.5px var(--mono);resize:vertical;-webkit-user-select:text;user-select:text;background:#0b1117;border:0;border-top:1px solid #1d2935;border-radius:0;height:52px}.overlay{z-index:50;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#0c141eb8;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.overlay .card{text-align:center;max-width:460px}.overlay .card.alert{border-top:4px solid var(--bad)}.shield{z-index:40;-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);pointer-events:none;background:#fff6;position:fixed;inset:0}.watermark{z-index:30;pointer-events:none;opacity:.06;position:fixed;inset:0;overflow:hidden}.toast{z-index:60;color:#fff;background:#16202b;border-radius:6px;padding:9px 16px;font-size:13px;position:fixed;bottom:18px;left:50%;transform:translate(-50%);box-shadow:0 6px 20px #00000040}.chat-fab{z-index:55;border-radius:999px;padding:10px 18px;position:fixed;bottom:18px;right:18px;box-shadow:0 4px 14px #1e5aa859}.chat-fab .dot{min-width:18px;color:var(--bad);background:#fff;border-radius:999px;margin-left:6px;padding:0 5px;font-size:11px;display:inline-block}.chat-panel{z-index:55;background:var(--panel);border:1px solid var(--line);-webkit-user-select:text;user-select:text;border-radius:10px;grid-template-rows:auto 1fr auto;width:min(360px,100vw - 36px);height:440px;display:grid;position:fixed;bottom:70px;right:18px;box-shadow:0 12px 36px #1018282e}.chat-head{border-bottom:1px solid var(--line);align-items:center;padding:10px 14px;display:flex}.chat-log{flex-direction:column;gap:8px;padding:12px;display:flex;overflow-y:auto}.bubble{white-space:pre-wrap;word-break:break-word;border-radius:10px;max-width:85%;padding:7px 11px;font-size:13px}.bubble.mine{background:var(--brand);color:#fff;border-bottom-right-radius:3px;align-self:flex-end}.bubble.theirs{background:#eef2f6;border-bottom-left-radius:3px;align-self:flex-start}.bubble .meta{opacity:.7;margin-top:2px;font-size:10.5px;display:block}.chat-input{border-top:1px solid var(--line);gap:6px;padding:10px;display:flex}.chat-input textarea{resize:none;height:40px}.admin{grid-template-rows:auto auto 1fr;min-height:100%;display:grid}.admin-top{background:var(--brand-dark);color:#fff;align-items:center;gap:14px;padding:12px 22px;display:flex}.admin-top button.ghost{color:#fff;border-color:#fff6}.admin-top button.ghost:hover{background:#ffffff1f}.tabs{background:var(--panel);border-bottom:1px solid var(--line);gap:2px;padding:0 22px;display:flex}.tabs button{color:var(--muted);background:0 0;border:0;border-bottom:2px solid #0000;border-radius:0;padding:12px 14px}.tabs button.active{color:var(--brand);border-bottom-color:var(--brand)}.tabs button:hover{background:var(--brand-soft)}.admin-main{min-width:0;padding:18px 22px}.stats{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:14px;display:grid}.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:10px 14px}.stat b{font-size:22px;display:block}.stat span{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-size:11.5px}.toolbar{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px;display:flex}.toolbar input,.toolbar select{width:auto;min-width:180px}.table-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px}th{text-align:left;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);border-bottom:1px solid var(--line);white-space:nowrap;background:#f8fafc;padding:9px 10px;font-size:11.5px}td{vertical-align:middle;border-bottom:1px solid #eef1f4;padding:8px 10px}tr:hover td{background:#fafcfe}td.mono{font-family:var(--mono)}.unread{text-align:center;background:var(--bad);color:#fff;border-radius:999px;min-width:20px;padding:1px 6px;font-size:11px;font-weight:700;display:inline-block}.drawer-bg{z-index:70;background:#0c141e59;position:fixed;inset:0}.drawer{z-index:71;background:var(--bg);grid-template-rows:auto 1fr;width:min(880px,100vw);display:grid;position:fixed;top:0;bottom:0;right:0;box-shadow:-10px 0 30px #00000026}.drawer-head{background:var(--panel);border-bottom:1px solid var(--line);align-items:center;gap:10px;padding:14px 20px;display:flex}.drawer-body{grid-template-columns:1fr 320px;align-items:start;gap:16px;padding:16px 20px;display:grid;overflow-y:auto}.section{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;padding:14px}.kv{grid-template-columns:130px 1fr;gap:4px 10px;font-size:13px;display:grid}.kv dt{color:var(--muted)}.kv dd{margin:0}.ans{border-top:1px solid #eef1f4;padding:10px 0}.ans:first-child{border-top:0}.opt{border-radius:4px;padding:2px 6px;font-size:12.5px}.opt.correct{background:var(--ok-soft);color:var(--ok);font-weight:600}.opt.wrong{background:var(--bad-soft);color:var(--bad);text-decoration:line-through}.code-view{color:#e3ebf3;font:12px/1.5 var(--mono);white-space:pre-wrap;background:#0f1720;border-radius:6px;max-height:260px;padding:10px;overflow:auto}.inbox{grid-template-columns:280px 1fr;gap:14px;height:calc(100vh - 150px);display:grid}.threads{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow-y:auto}.thread{cursor:pointer;border-bottom:1px solid #eef1f4;align-items:center;gap:8px;padding:10px 12px;display:flex}.thread:hover,.thread.active{background:var(--brand-soft)}.thread-view{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);grid-template-rows:auto 1fr auto;min-height:0;display:grid}@media (width<=860px){.exam-body{grid-template-columns:1fr}.palette{border-right:0;border-bottom:1px solid var(--line)}.drawer-body,.inbox{grid-template-columns:1fr}}.overlay.above-drawer{z-index:90}
