:root{--bg:#f7f7f4;--ink:#1d2a33;--mut:#5d6b75;--line:#c9d0d4;--acc:#1f6f8b;--ok:#2a8a4a;--bad:#c0392b;--warn:#c27a00;--card:#fff;--acc-soft:#e6f2f6;--ok-soft:#e5f3ea}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{color:var(--ink);background:var(--bg);overscroll-behavior:none;-webkit-text-size-adjust:100%;font-family:system-ui,-apple-system,Segoe UI,sans-serif}button{font:inherit;color:inherit}button,#svg,.pal{-webkit-tap-highlight-color:transparent}code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.95em}#app{grid-template-rows:auto minmax(0,1fr);grid-template-columns:minmax(0,1fr);height:100%;display:grid;overflow:hidden}header{border-bottom:1px solid var(--line);background:var(--card);align-items:center;gap:10px;min-width:0;padding:6px 10px;display:flex}.brand{white-space:nowrap;font-size:16px}#modebar{border:1px solid var(--line);border-radius:10px;flex:none;display:flex;overflow:hidden}#modebar button{background:var(--card);cursor:pointer;white-space:nowrap;border:0;border-radius:0;align-items:center;min-height:40px;padding:0 14px;font-size:14px;display:inline-flex}#modebar button+button{border-left:1px solid var(--line)}#modebar .mi{margin-left:6px}#modebar button.on{background:var(--acc-soft);color:var(--acc);font-weight:700}#modebar button.on.act{background:var(--ok-soft);color:var(--ok)}#tools{-webkit-overflow-scrolling:touch;flex:1;gap:6px;min-width:0;padding:2px;display:flex;overflow-x:auto}.btn{border:1px solid var(--line);background:var(--card);white-space:nowrap;cursor:pointer;border-radius:8px;min-height:40px;padding:0 12px;font-size:14px}.btn.on{border-color:var(--acc);box-shadow:inset 0 0 0 1px var(--acc);color:var(--acc);font-weight:600}.btn.bad{color:var(--bad);border-color:#e3b3ad}.sep{background:var(--line);flex:none;width:1px;margin:4px 2px}main{grid-template-columns:minmax(0,1fr) 340px;min-height:0;display:grid}#work{grid-template-columns:90px 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10px;font-size:13px}.small{font-size:12px}.e{color:var(--bad)}ul.issues{background:#fdf1ef;border:1px solid #e3b3ad;border-radius:8px;margin:8px 0;padding:8px 10px 8px 26px;font-size:14px;line-height:1.5}.dot{border-radius:50%;flex:none;width:12px;height:12px;margin-top:4px}.dot.ok{background:var(--ok)}.dot.bad{background:var(--bad)}.btn.back{margin-bottom:8px}.login{background:var(--bg);justify-content:center;align-items:center;min-height:100%;padding:16px;display:flex}.login>div{text-align:center;max-width:420px}.login h1{margin:0 0 8px;font-size:40px}.btn.big{align-items:center;min-height:52px;margin:12px 0;padding:0 24px;font-size:17px;text-decoration:none;display:inline-flex}.linkbtn{color:var(--acc);cursor:pointer;font:inherit;background:0 0;border:0;padding:0;text-decoration:underline}.who{white-space:nowrap;flex:none;align-items:center;gap:8px;display:flex}.chip{border:1px solid var(--line);background:var(--card);border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:13px;display:inline-flex}.chip button{cursor:pointer;background:0 0;border:0;min-width:28px;min-height:28px;font-size:16px}.chips{flex-wrap:wrap;gap:6px;margin:6px 0;display:flex}.teacher{z-index:15;background:#1d2a3359;justify-content:center;padding:16px;display:flex;position:fixed;inset:0;overflow-y:auto}.teacher-inner{background:var(--card);border-radius:12px;align-self:flex-start;width:min(960px,100%);padding:16px}.teacher-head{justify-content:space-between;align-items:center;display:flex}.teacher-head h2{margin:0}.tabs{flex-wrap:wrap;gap:6px;margin:12px 0;display:flex}.card{border:1px solid var(--line);border-radius:10px;margin:8px 0}.card.archived{opacity:.7}.card-head{text-align:left;cursor:pointer;background:0 0;border:0;align-items:baseline;gap:10px;width:100%;min-height:44px;padding:12px;display:flex}.course-detail{padding:0 12px 12px}.course-detail h4{margin:14px 0 6px}ul.hits{flex-direction:column;gap:6px;margin:6px 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.ipl.bad{fill:var(--bad)}.row input{border:1px solid var(--line);min-width:0;min-height:40px;font:inherit;border-radius:8px;flex:1;padding:0 10px;font-size:15px}.row input.short{flex:0 0 110px}.o{color:var(--ok)}.flash{background:var(--ink);color:#fff;z-index:30;border-radius:8px;padding:8px 14px;position:fixed;top:16px;left:50%;transform:translate(-50%)}.solved.sub{color:var(--acc);background:var(--acc-soft)}