:root{color-scheme:dark;--bg:#0a1220;--card:#112033;--layer:#1b3046;--line:#2c4357;--txt:#eaf4fa;--muted:#9fb4c8;--teal:#55dbc1;--red:#ff9095;--yellow:#f4c778}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--txt);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5}button,input{font:inherit}button{cursor:pointer;border:1px solid var(--line);background:var(--layer);color:var(--txt);border-radius:12px;padding:12px 15px;min-height:44px}button:hover{filter:brightness(1.12)}button:disabled{opacity:.45;cursor:default}.primary{background:var(--teal);color:#082524;border-color:var(--teal);font-weight:750}.red{color:var(--red)}.muted{color:var(--muted)}a{color:var(--teal)}.shell{max-width:1180px;margin:auto;padding:20px;display:grid;grid-template-columns:230px 1fr;gap:22px}.aside{position:sticky;top:20px;align-self:start}.brand{font-size:24px;font-weight:800;color:var(--teal);padding:8px 0 20px}.nav{display:grid;gap:7px}.nav button{text-align:left}.nav .active{border-color:var(--teal)}.content{min-width:0}.head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin:0 0 18px}.head h1{font-size:26px;margin:0}.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px;margin-bottom:16px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tile{text-align:left;padding:17px;display:flex;flex-direction:column;gap:5px}.tile b{font-size:17px}.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.spread{justify-content:space-between}.trail{color:var(--muted);font-size:13px;line-height:1.9;margin-bottom:14px}.trail button{min-height:0;padding:4px 8px;margin:3px;font-size:12px}.pill{background:#133e3b;color:#aaf0df;border:1px solid #2c7066;border-radius:50px;padding:4px 11px;font-size:12px}.stat{font-size:13px;color:var(--muted)}.stat b{color:var(--txt);font-size:24px}.progress{height:8px;border-radius:9px;background:#304259;overflow:hidden;margin:12px 0}.progress>div{height:100%;background:var(--teal)}.question{font-size:clamp(18px,2.2vw,24px);font-weight:680;margin:16px 0 20px}.choice{display:flex;gap:14px;width:100%;text-align:left;background:#13263a;margin:8px 0;align-items:flex-start}.choice span:first-child{min-width:25px;font-weight:800;color:var(--teal)}.choice.selected{border-color:var(--yellow);background:#3a3529}.choice.correct{border-color:var(--teal);background:#153d34}.choice.wrong{border-color:var(--red);background:#412b33}.actions{margin:18px 0 12px}.actions>button{flex:1}.answer{background:#123630;border:1px solid #297d69;padding:16px;border-radius:12px;margin:12px 0}.source{width:100%;max-width:800px;max-height:none;height:auto;display:block;background:white;margin:10px auto;border-radius:8px}.source-small{max-width:440px}.fine{font-size:12px;color:var(--muted)}.danger{border-color:#a44a55;color:#ffb6b9}.empty{text-align:center;padding:35px;color:var(--muted)}.textlink{padding:0;min-height:0;background:none;border:0;color:var(--teal);text-decoration:underline}.foot{padding:10px 0;font-size:12px;color:var(--muted)}input[type=file]{max-width:100%}.banner{border:1px solid #92794b;background:#2a2619;color:#efd8a8;border-radius:12px;padding:12px;font-size:13px;margin-bottom:16px}.split{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.split button{font-size:14px}.index{color:var(--muted);font-size:12px;margin-top:10px}.disabled{opacity:.5}@media(max-width:760px){.shell{display:block;padding:12px}.aside{position:static}.brand{padding:3px 0 8px;font-size:20px}.nav{display:flex;overflow-x:auto;padding-bottom:9px}.nav button{white-space:nowrap;padding:9px 12px;font-size:13px}.head h1{font-size:22px}.panel{padding:15px}.grid{grid-template-columns:1fr}.split button{padding:10px 5px;font-size:12px}.actions{gap:7px}.actions button{padding:11px 8px}.source{max-width:100%}}