:root{--bg:#122526;--panel:#1d3435;--panel2:#284243;--text:#f4f1e7;--muted:#b5c9c5;--line:#3b5554;--accent:#c5f073;--ink:#152423;--warm:#e9b787;--radius:22px;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:17px/1.55 Arial,Helvetica,sans-serif;letter-spacing:.015em;min-height:100vh}body.light{--bg:#f4f0e5;--panel:#fffcf4;--panel2:#e7e8dc;--text:#203330;--muted:#536561;--line:#cad2c5;--accent:#c5f073;color-scheme:light}body.large{font-size:19px}button,input,select{font:inherit}button,a,select,input{-webkit-tap-highlight-color:transparent}button,select{cursor:pointer}button{border:0}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--warm);outline-offset:4px}a{color:inherit}h1,h2,h3,p{margin:0}h1{font-size:clamp(30px,5vw,44px);line-height:1.15;letter-spacing:-.035em}h2{font-size:24px;line-height:1.25;letter-spacing:-.02em}h3{font-size:19px}p{line-height:1.6}.muted{color:var(--muted)}.eyebrow{font-size:12px;font-weight:bold;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}.light 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1fr;gap:20px}.grid>.card+.card{margin-top:0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stat strong{display:block;font-size:28px;letter-spacing:-.04em}.stat span{display:block;color:var(--muted);font-size:13px}.meter{height:8px;border-radius:6px;background:var(--panel2);overflow:hidden;margin-top:12px}.meter>span{display:block;background:var(--accent);height:100%;width:0}.session-pips{display:flex;gap:8px;margin-top:18px}.pip{border:1px solid var(--line);border-radius:12px;padding:8px 12px;font-size:14px;color:var(--muted)}.pip.done{border-color:var(--accent);color:var(--text)}.level-list{display:flex;flex-direction:column;gap:9px;margin-top:18px}.level{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--line);border-radius:13px;background:transparent;color:var(--text);text-align:left;width:100%}.level .num{width:32px;height:32px;border-radius:10px;background:var(--panel2);display:grid;place-items:center;flex-shrink:0;font-size:15px}.level .desc{flex:1}.level.active{border-color:var(--accent)}.level .lock{color:var(--muted);font-size:12px}.badge{display:inline-block;padding:4px 9px;border:1px solid var(--line);border-radius:20px;font-size:12px;color:var(--muted)}.pc-art{display:block;width:100%;max-width:235px;height:180px;margin:12px auto}.parts{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.part{padding:8px 4px;background:var(--panel2);border:1px solid var(--line);border-radius:9px;text-align:center;font-size:11px;color:var(--muted)}.part.earned{border-color:var(--accent);color:var(--text)}.part b{display:block;font-size:17px}.chart{display:flex;align-items:flex-end;gap:8px;height:116px;border-bottom:1px solid var(--line);padding-top:8px;margin-top:20px}.chart-column{flex:1;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:flex-end}.chart-bar{background:var(--accent);width:100%;max-width:34px;min-height:2px;border-radius:5px 5px 0 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.operator{font-size:31px;color:var(--muted)}.answer-box{min-width:68px;min-height:67px;border:2px solid var(--accent);border-radius:14px;background:var(--bg);display:grid;place-items:center;font-size:40px}.feedback{margin:12px 0 8px;min-height:26px;font-size:15px}.feedback.correct{color:var(--accent)}.light .feedback.correct{color:#375d28}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;max-width:350px;margin:14px auto 0}.keypad button{min-height:52px;background:var(--panel2);color:var(--text);font-size:25px;border:1px solid var(--line);border-radius:12px;touch-action:manipulation}.keypad .enter{background:var(--accent);color:var(--ink)}.keypad .delete{font-size:20px}.exercise-tools{display:flex;gap:8px;margin-top:14px}.exercise-tools button{flex:1;padding:9px;font-size:14px;min-height:44px}.hint{background:var(--bg);padding:17px;border:1px solid var(--line);border-radius:14px;margin-top:16px;text-align:left}.hint 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.preview-bar{background:var(--panel);border:1px dashed var(--warm);border-radius:14px;padding:12px 16px;margin-bottom:20px}.preview-bar .quiet{min-height:38px}.training .preview-bar{padding:4px 10px;margin:0 auto 10px;max-width:520px;font-size:12px}.training .preview-bar .quiet{font-size:12px;min-height:32px;padding:4px}.training .preview-bar strong{white-space:nowrap}
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.onboarding .preview-bar{max-width:560px;margin:0 auto 10px;padding:4px 10px;font-size:12px}.onboarding .preview-bar .quiet{font-size:12px;min-height:32px;padding:4px}
@media(min-width:800px){.exercise{padding:30px}.keypad button{min-height:58px}.report .stats{margin:25px 0}.login{margin-top:65px}}
@media(max-width:600px){.topbar{padding:18px 16px}.brand{font-size:19px}.tools{gap:5px}.tools select,.icon-button{min-width:38px;height:38px;padding:0 7px}main{padding:14px 16px 30px}.hero{display:block;margin-bottom:24px}.hero .badge{margin-top:16px}.hero h1{font-size:32px}.hero p{font-size:16px}.grid{grid-template-columns:1fr;gap:16px}.card{padding:20px;border-radius:19px}.login{margin-top:18px}.login h1{font-size:35px}.stat strong{font-size:25px}.stats{gap:10px}.stat span{font-size:12px}.equation{font-size:43px;gap:9px;min-height:76px}.equation .operator{font-size:28px}.answer-box{font-size:37px;min-height:62px;min-width:62px}.exercise{padding:17px 15px 14px}.exercise .eyebrow{margin-bottom:4px}.session-header{margin-bottom:10px}.keypad{margin-top:10px;gap:7px}.keypad button{min-height:49px}.feedback{margin-top:8px;margin-bottom:5px;font-size:14px}.exercise-tools{margin-top:10px}.exercise-tools button{font-size:13px;padding:7px 3px}.training main{padding:0 12px 20px}.session-header .quiet{min-height:40px;padding:6px}.session-header .badge{font-size:11px}.hint-step{font-size:21px}.footer{gap:12px}.parent .hero h1{font-size:30px}.parent .grid{grid-template-columns:1fr}}
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