:root{color-scheme:light;--bg:#f5f7fc;--panel:#ffffff;--line:#d9e0ec;--muted:#596579;--text:#202c40;--accent:#5453c6;--gold:#946000;--green:#18724b;--red:#b83047}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 85% 10%,#e9edff 0,transparent 43%),var(--bg);color:var(--text);font:16px/1.55 'Segoe UI',system-ui,sans-serif;min-height:100vh}button,input{font:inherit}button,.button{cursor:pointer;border:1px solid transparent;border-radius:12px;padding:12px 18px;font-weight:600;min-height:48px;transition:background .15s,transform .15s}button:active{transform:translateY(1px)}button:disabled{cursor:default;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,.button:focus-visible{outline:3px solid var(--gold);outline-offset:4px}a{color:var(--accent)}.shell{max-width:1200px;padding:0 36px;margin:auto}header{display:flex;align-items:center;justify-content:space-between;padding:30px 0;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:var(--text);font-size:21px;font-weight:700}.brand small{display:block;color:var(--muted);font-weight:400;font-size:12px}.brand-mark{background:var(--accent);color:#ffffff;width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font-size:31px}.header-actions,.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.class-tag,.eyebrow{font-size:12px;letter-spacing:1.3px;text-transform:uppercase;color:var(--muted)}.quiet{background:#edf1f8;color:var(--text);border-color:var(--line)}.quiet:hover{background:#e1e7f2}.primary{background:var(--accent);color:#ffffff}.primary:hover{background:#4140a8}main{padding:38px 0 20px}h1{font-size:clamp(30px,4vw,46px);letter-spacing:-1.5px;line-height:1.17;margin:12px 0 14px;font-weight:650}h2{font-size:23px;line-height:1.3;margin:10px 0 16px}h3{font-size:18px;margin:0}p{color:var(--muted);margin:10px 0 18px}.intro{display:grid;grid-template-columns:1.2fr 1fr;gap:35px;margin-bottom:32px;align-items:center}.wallet{padding:25px 28px;border:1px solid #e4ce99;border-radius:20px;background:linear-gradient(130deg,#fff6da,#fffaf0);position:relative;overflow:hidden}.balance{font-size:44px;font-weight:650;letter-spacing:-1px;color:var(--gold);margin:4px 0}.coin{display:inline-grid;place-items:center;width:34px;height:34px;vertical-align:middle;border-radius:50%;background:#f5d477;color:#5b431f;font-size:20px;box-shadow:inset 0 0 0 4px #e4b441;margin-right:8px}.wallet p{margin:0 0 12px;color:#6e582b}.progress{height:7px;border-radius:6px;overflow:hidden;background:#e0e6f0}.progress>span{display:block;background:var(--accent);height:100%;border-radius:6px}.wallet .progress>span{background:var(--gold)}.goal-line{display:flex;justify-content:space-between;gap:12px;margin-top:9px;font-size:13px;color:#6e582b}.stats{display:flex;gap:24px;color:var(--muted);font-size:14px}.stats b{color:var(--text)}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:24px 0}.tabs{display:flex;gap:8px}.tab{background:transparent;color:var(--muted);border-color:var(--line)}.tab[aria-pressed=true]{background:var(--accent);color:#ffffff;border-color:var(--accent)}input{padding:13px 15px;background:#ffffff;color:var(--text);border:1px solid #9aa8bc;border-radius:10px;min-height:48px;max-width:100%}input::placeholder{color:#657288}.search{width:260px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:30px 0 14px}.section-heading small{color:var(--muted);font-size:13px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.topic{text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;color:var(--text);display:flex;flex-direction:column;min-height:172px;gap:10px}.topic:hover{background:#f0f2ff;border-color:#9699db}.topic-top{display:flex;justify-content:space-between;color:var(--accent);font-size:12px}.topic h3{font-size:17px;font-weight:600;line-height:1.4;flex:1}.topic-bottom{font-size:12px;color:var(--muted);display:flex;justify-content:space-between}.topic .progress{height:4px}.note{font-size:14px;color:var(--muted);border-left:2px solid #a6add5;padding-left:14px}.game{max-width:800px;margin:0 auto}.game-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.game-card{padding:34px;background:var(--panel);border:1px solid var(--line);border-radius:22px;margin-top:22px}.question{font-size:25px;line-height:1.55;margin:15px 0 24px;white-space:pre-line;overflow-wrap:anywhere}.answers{display:grid;gap:11px}.answer{background:#ffffff;color:var(--text);border-color:#bac5d6;text-align:left;font-weight:400;display:flex;gap:15px;align-items:center}.answer:hover:enabled{background:#eef0ff}.answer .key{font-size:12px;color:var(--muted);border:1px solid #9aa8bc;border-radius:5px;padding:1px 7px;flex-shrink:0}.answer.correct{border-color:var(--green);background:#e7f5ec}.answer.wrong{border-color:var(--red);background:#fff0f2}.answer:disabled{opacity:1}.feedback{padding:17px 20px;border-radius:12px;margin:20px 0;background:#f0f3fa;white-space:pre-line}.feedback.good{background:#e7f5ec;color:#185c3e;border-left:3px solid var(--green)}.feedback.bad{background:#fff0f2;color:#962b3e;border-left:3px solid var(--red)}.feedback p{margin:6px 0 0;color:var(--text)}.hint{color:#384b74;background:#edf2fc;padding:16px;border-radius:10px;margin:18px 0}.game-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:24px}.number-form{display:flex;gap:12px;flex-wrap:wrap}.number-form input{flex:1;min-width:120px}.result{text-align:center;padding:38px 20px}.result .balance{font-size:65px}.result .actions{justify-content:center}.empty{padding:30px;border:1px dashed var(--line);border-radius:14px;color:var(--muted)}footer{padding:28px 0 35px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;margin-top:25px}dialog{background:#ffffff;color:var(--text);border:1px solid #bcc7d8;border-radius:20px;padding:30px;max-width:620px;width:calc(100% - 30px);max-height:90vh}dialog::backdrop{background:#28344966}dialog .close{float:right}dialog label:not(.button){display:block;margin:15px 0 6px}dialog input:not([type=file]){width:100%;margin-bottom:12px}dialog details{margin-top:24px;border-top:1px solid var(--line);padding-top:18px;font-size:14px}summary{cursor:pointer;font-weight:600;min-height:44px}#goal-status,#import-status{color:var(--green)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:800px){.shell{padding:0 20px}.intro{grid-template-columns:1fr;gap:20px}.grid{grid-template-columns:repeat(2,1fr)}h1{max-width:600px}.wallet{padding:22px}.brand small{display:none}.class-tag{display:none}.game-card{padding:24px}.question{font-size:23px}}@media(max-width:500px){header{padding:20px 0}.brand{font-size:16px}.brand-mark{width:34px;height:34px;font-size:25px}.header-actions button{padding:9px 10px;font-size:12px}.shell{padding:0 15px}main{padding-top:24px}.grid{grid-template-columns:1fr}.topic{min-height:145px}.toolbar{align-items:stretch}.tabs{width:100%}.tab{flex:1;padding:12px 10px}.search{width:100%}.game-head{font-size:13px}.game-card{padding:20px}.question{font-size:21px}.game-actions{flex-wrap:wrap}.stats{gap:14px;flex-wrap:wrap}dialog{padding:22px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.panel,.game-card,.topic,dialog{box-shadow:0 4px 18px #23355208}
select:focus-visible{outline:3px solid var(--accent);outline-offset:3px}