@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#172e2c;--muted:#62736f;--green:#123c35;--lime:#ddf2a0;--line:#dce4e1;--paper:#f4f7f5;--white:#fff;--red:#a93239;--radius:16px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.55 'DM Sans',sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}a{color:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #638fcd;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3,.brand{font-family:Manrope,sans-serif}h1{font-size:34px;letter-spacing:-1.2px;line-height:1.25;margin-bottom:10px}h2{font-size:22px;line-height:1.35;letter-spacing:-.5px}h3{font-size:17px;line-height:1.4;margin-bottom:8px}.shell{display:flex;min-height:100vh}aside{width:246px;flex-shrink:0;background:var(--white);border-right:1px solid var(--line);padding:35px 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h2{margin:0}.section-head small{color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;display:flex;flex-direction:column;text-decoration:none;transition:transform .15s,border-color .15s}.topic-card:hover{transform:translateY(-3px);border-color:#72978b}.topic-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px}.topic-number{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;background:#edf3ef;font:600 13px Manrope;color:#456e5e}.topic-card .meta{font-size:12px;color:var(--muted)}.topic-card h3{min-height:48px}.topic-card p{font-size:13px;color:var(--muted);margin:0 0 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p{color:var(--muted);font-size:15px;margin-bottom:10px}.formula{font-family:ui-monospace,monospace;font-size:15px;background:#f0f5f2;padding:13px 16px;border-left:3px solid #98ba73;border-radius:4px;overflow-wrap:anywhere}.controls{display:flex;align-items:end;gap:14px;flex-wrap:wrap;margin:20px 0}.controls label,.field{display:flex;flex-direction:column;gap:7px;color:var(--muted);font-size:14px}select,input{background:white;border:1px solid #bacbc3;border-radius:8px;min-height:44px;padding:9px 12px;max-width:100%;color:var(--ink)}.question-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:25px;color:var(--muted);font-size:13px}.question-text{font-size:22px;line-height:1.6;font-weight:500;margin:20px 0 27px}.answers{display:grid;gap:12px}.answer{display:flex;align-items:center;gap:16px;text-align:left;background:white;border:1px solid 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@media(min-width:1500px){main{padding-top:48px}.topic-card{padding:25px}}@media(max-width:1150px){aside{width:205px;padding:30px 14px}main{padding:30px 24px}header,footer{padding-left:24px;padding-right:24px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat{padding:16px}.hero-grid{grid-template-columns:1.3fr 1fr}}@media(max-width:800px){aside{width:76px;padding:25px 12px}.brand>span:last-child,.nav-label,nav a span,.sidebar-bottom{display:none}nav{margin-top:35px}nav a{justify-content:center;padding:12px;font-size:22px}.brand{justify-content:center}.hero-grid,.two-col{grid-template-columns:1fr}.header-badge{display:none}.stats{gap:10px}.stat strong{font-size:24px}h1{font-size:29px}.daily-card{padding:22px}}@media(max-width:550px){.shell{display:block}aside{position:static;width:100%;height:auto;padding:14px 18px;display:block;border-bottom:1px solid var(--line)}.brand{justify-content:start}.brand>span:last-child{display:block}nav{display:flex;gap:6px;margin:14px 0 0;justify-content:space-between}nav a{font-size:24px;padding:5px 13px}header{min-height:52px;padding:13px 20px;font-size:11px}main{padding:25px 18px 35px}.page-head{align-items:start;flex-wrap:wrap}.stats{grid-template-columns:1fr 1fr;margin:20px 0}.stat{padding:16px}.topic-grid,.exam-options{grid-template-columns:1fr}.topic-card h3{min-height:0}.topic-card{padding:20px}.focus-card,.panel{padding:22px}.focus-card h2{font-size:25px}.question-text{font-size:19px}.flash{padding:28px 20px;min-height:290px}.flash .card-text{font-size:22px}.tabs{flex-wrap:wrap}.controls{align-items:stretch}.controls label{width:100%}.controls select{width:100%}.question-head{flex-wrap:wrap}.plan-days{grid-template-columns:repeat(4,1fr)}footer{padding:20px}.quiz-actions{flex-wrap:wrap}}