:root{--bg-page: #f4efe0;--card: #fbf6e9;--ink: #1f2a44;--ink-soft: #3c4a66;--charcoal: #2b2b28;--line: #e5ded0;--green: #0f6e56;--green-pale: #eaf3de;--green-icon: #639922;--green-text: #173404;--gold: #c89b2c;--gold-pale: #faeeda;--gold-icon: #ba7517;--gold-text: #854f0b;--wrong-pale: #fcebeb;--wrong-icon: #e24b4a;--wrong-text: #791f1f}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%}body{background:var(--bg-page);color:var(--charcoal);font-family:Georgia,Iowan Old Style,serif;position:relative;isolation:isolate}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background-image:url(/3.png);background-repeat:no-repeat;background-position:center;background-size:cover;opacity:.15;pointer-events:none;z-index:-1}.page{min-height:100vh;display:flex;justify-content:center;padding:28px 16px 80px}.sheet{width:100%;max-width:460px}.header{margin-bottom:22px}.tag{font-family:Helvetica Neue,Arial,sans-serif;font-size:12.5px;font-weight:500;letter-spacing:.01em;color:#eaf7f1;background:var(--green);padding:4px 10px;border-radius:20px;display:inline-block}h1{font-size:34px;margin:10px 0 4px;color:var(--ink);font-weight:700;line-height:1.15}.sub{font-family:Helvetica Neue,Arial,sans-serif;color:var(--ink-soft);font-size:14.5px;max-width:46ch;line-height:1.5}.panel{background:var(--card);border-radius:16px;padding:20px 20px 22px;margin-top:18px}.panel-title{font-family:Helvetica Neue,Arial,sans-serif;font-size:15px;font-weight:700;color:var(--ink);margin-bottom:8px}.subject-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}.subject-btn{font-family:Helvetica Neue,Arial,sans-serif;background:#fff;border:1px solid var(--line);color:var(--ink);padding:11px 16px;border-radius:10px;font-size:14.5px;cursor:pointer;transition:border-color .15s 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16px}.options{display:flex;flex-direction:column;gap:9px}.opt{position:relative;display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 13px;cursor:pointer;font-size:15.5px;line-height:1.4;transition:border-color .12s ease,background .12s ease}.opt:hover{border-color:var(--green)}.opt .letter{font-family:Helvetica Neue,Arial,sans-serif;font-weight:700;font-size:11px;color:var(--ink-soft);background:var(--bg-page);flex-shrink:0;width:20px;height:20px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center}.opt.correct{background:var(--green-pale);border-color:var(--green-icon);color:var(--green-text);font-weight:500}.opt.correct .letter{background:var(--green-icon);color:var(--green-pale)}.opt.wrong{background:var(--wrong-pale);border-color:var(--wrong-icon);color:var(--wrong-text);text-decoration:line-through;text-decoration-color:#791f1f66}.opt.wrong .letter{background:var(--wrong-icon);color:var(--wrong-pale)}.opt.disabled{cursor:default}.confetti-dot{position:absolute;top:-6px;width:6px;height:6px;border-radius:50%;opacity:0;animation:confetti-pop .7s ease-out forwards}@keyframes confetti-pop{0%{opacity:1;transform:translateY(0) scale(1)}to{opacity:0;transform:translateY(-22px) scale(.6)}}@media (prefers-reduced-motion: reduce){.confetti-dot{animation:none;opacity:0}}.feedback{margin-top:14px;font-family:Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--ink-soft);background:var(--gold-pale);border-left:3px solid var(--gold);padding:10px 13px;border-radius:0 8px 8px 0;line-height:1.5}.row-actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}.btn{font-family:Helvetica Neue,Arial,sans-serif;font-size:14px;padding:10px 15px;border-radius:8px;border:1px solid var(--green);background:var(--green);color:#eaf7f1;cursor:pointer}.btn:disabled{opacity:.5;cursor:default}.btn-secondary{background:transparent;border-color:var(--ink);color:var(--ink)}.explain-box{margin-top:12px;font-family:Helvetica Neue,Arial,sans-serif;font-size:14.5px;line-height:1.6;color:var(--charcoal);background:#fff;border:1px solid var(--line);padding:12px 14px;border-radius:10px;white-space:pre-wrap}h2{color:var(--ink);font-size:26px;margin:0 0 6px}.big-score{font-family:Helvetica Neue,Arial,sans-serif;font-size:46px;font-weight:700;color:var(--green)}.big-score span{font-size:20px;color:var(--ink-soft);font-weight:400}.best-streak{display:inline-flex;align-items:center;gap:5px;font-family:Helvetica Neue,Arial,sans-serif;font-size:13px;font-weight:500;color:var(--gold-text);background:var(--gold-pale);padding:5px 12px;border-radius:20px;margin-top:10px}.best-streak .flame{color:var(--gold-icon)}.weak{font-family:Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--ink-soft);margin-top:12px;line-height:1.6}textarea{width:100%;font-family:Helvetica Neue,Arial,sans-serif;font-size:14.5px;padding:11px 13px;border-radius:10px;border:1px solid var(--line);background:#fff;resize:vertical;min-height:64px}footer{margin-top:26px;font-family:Helvetica Neue,Arial,sans-serif;font-size:12px;color:var(--ink-soft);opacity:.7}