:root{--ink:#182d36;--muted:#58686a;--paper:#f6f5ef;--yellow:#eed444;--line:#d8ddd5;--green:#195e47;--warm:#914317}*{box-sizing:border-box}body{background:var(--paper);color:var(--ink);margin:0;font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.55}button,input{font:inherit}button,a,input,label{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}button:focus-visible,a:focus-visible,input:focus-visible{outline-offset:4px;outline:3px solid #278065}a{color:inherit;text-underline-offset:4px}h1,h2,h3,p{margin:0}h1{letter-spacing:-2.6px;font-size:clamp(36px,4.4vw,58px);font-weight:750;line-height:1.08}h1 em{color:var(--green);font-style:normal}h2{letter-spacing:-1px;font-size:32px;line-height:1.17}h3{letter-spacing:-.35px;font-size:20px}p{margin-top:14px}main{max-width:1136px;margin:auto;padding:0 32px 28px}.mast{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;max-width:1280px;min-height:100px;margin:auto;padding:22px 40px;display:flex}.brand{letter-spacing:-.7px;align-items:center;gap:10px;font-size:23px;font-weight:900;line-height:1.05;text-decoration:none;display:flex}.brand-light{font-weight:400}.brand small{letter-spacing:3px;margin-top:6px;font-size:9px;display:block}.brand-icon{background:var(--yellow);border-radius:11px;padding:5px 11px;font-size:34px;line-height:1.3}.edition,.eyebrow,.label{letter-spacing:1.7px;font-size:11px;font-weight:800}.edition{color:var(--muted)}.private{color:var(--green);font-size:12px}.topline{justify-content:space-between;gap:12px;margin:29px 0 40px;display:flex}.tiny,.small,.muted{color:var(--muted)}.tiny,.small{font-size:12px}.muted{font-size:14px}.label{margin-bottom:13px;display:block}.lead{color:var(--muted);font-size:19px;line-height:1.6}.login-grid{grid-template-columns:1.2fr 1fr;align-items:center;gap:90px;padding:26px 0 70px;display:grid}.login-grid h1{letter-spacing:-4px;font-size:clamp(52px,6vw,80px)}.card{border:1px solid var(--line);background:#fffefa;border-radius:22px;padding:30px}.login{max-width:410px;box-shadow:0 10px 30px #182d3608}.login h2{font-size:30px}.login p{color:var(--muted);font-size:14px}.login label{margin-top:24px;font-size:13px;font-weight:700;display:block}.login input{letter-spacing:18px;border:1px solid var(--line);background:var(--paper);border-radius:12px;width:100%;margin:8px 0 0;padding:13px 20px;font-size:30px}.primary{background:var(--ink);color:#fff;text-align:left;border:0;border-radius:11px;justify-content:space-between;align-items:center;width:100%;min-height:53px;margin-top:24px;padding:14px 20px;font-size:15px;font-weight:700;display:flex}.primary span{font-size:23px;line-height:1}.primary:hover{background:#2a4954}.secondary{border:1px solid var(--ink);color:var(--ink);background:0 0;border-radius:11px;min-height:48px;padding:13px 20px;font-weight:600}.road-art{letter-spacing:2px;border-block:1px dashed #b6beb7;align-items:center;gap:16px;max-width:390px;margin:36px 0;padding:24px 0;font-size:10px;font-weight:700;display:flex}.road-art i{border-top:3px dashed var(--ink);flex:1}.road-art b{background:var(--yellow);border-radius:50%;place-items:center;width:48px;height:48px;font-size:28px;display:grid}.error{min-height:18px;color:#a33428!important}.dashboard-head{justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:35px;display:flex}.mini-stats{gap:38px;padding-bottom:3px;display:flex}.mini-stats div{flex-direction:column;display:flex}.mini-stats strong{letter-spacing:-1px;font-size:32px}.mini-stats small{color:var(--muted);font-size:17px;font-weight:400}.mini-stats span{color:var(--muted);font-size:12px}.tabs{border-bottom:1px solid var(--line);gap:28px;margin-bottom:32px;display:flex}.tabs button{color:var(--muted);border:0;background:0 0;border-bottom:3px solid #0000;min-height:50px;margin-bottom:-1px;padding:15px 3px;font-size:14px;font-weight:600}.tabs button[aria-current]{color:var(--ink);border-color:var(--ink)}.start-grid{grid-template-columns:1.15fr 1fr;gap:24px;display:grid}.start-card{background:var(--yellow);border-radius:22px;padding:36px 38px;position:relative;overflow:hidden}.start-card h2{letter-spacing:-2px;font-size:44px}.start-card p{max-width:345px}.start-card .primary{max-width:360px}.start-card>.small{color:#34443e;margin-top:12px;display:block}.route-card{padding:34px}.route-card ol{margin:22px 0;padding:0;list-style:none}.route-card li{gap:18px;margin-bottom:23px;display:flex}.route-card li b{background:#edf0e8;border-radius:50%;flex-shrink:0;place-items:center;width:35px;height:35px;font-size:12px;display:grid}.route-card li p{color:var(--muted);margin-top:1px;font-size:14px}.study-layout{grid-template-columns:minmax(0,2.2fr) minmax(0,1fr);gap:28px;display:grid}.question h2{outline:none;margin:20px 0 24px;font-size:28px;line-height:1.3}.question-meta{justify-content:space-between;align-items:center;gap:12px;display:flex}.question-meta .label{margin:0}.pill{white-space:nowrap;background:#edf0e8;border-radius:20px;padding:5px 10px;font-size:11px;font-weight:700;display:inline-block}.question-image{border:1px solid var(--line);width:100%;color:var(--muted);background:#fff;border-radius:13px;flex-direction:column;align-items:center;gap:9px;margin-bottom:20px;padding:16px;font-size:12px;display:flex}.question-image img{object-fit:contain;max-width:100%;max-height:240px}.choice-image{max-width:100%;max-height:110px;margin-top:8px;display:block}.question fieldset{border:0;margin:0;padding:0}.choice{border:1.5px solid var(--line);cursor:pointer;border-radius:12px;align-items:center;gap:13px;min-height:64px;margin-bottom:12px;padding:16px 17px;display:flex;position:relative}.choice input{opacity:0;width:1px;height:1px;position:absolute}.choice:has(input:focus-visible){outline-offset:3px;outline:3px solid #278065}.choice.chosen{border-color:var(--ink);background:#f1f2eb}.letter{border:1px solid var(--line);border-radius:7px;flex-shrink:0;align-self:flex-start;place-items:center;width:27px;height:27px;font-size:12px;font-weight:700;display:grid}.choice>strong{margin-left:auto}.choice.right{background:#edf5ec;border-color:#538c68}.choice.wrong{background:#fbf0e8;border-color:#b46a4b}.aside-note{background:#e8ede5;border-radius:18px;padding:26px}.aside-note p{color:var(--muted);font-size:14px}.save-note{color:var(--green);margin:25px;font-size:13px}.save-note p{color:var(--muted);font-size:12px}.text-button{text-align:left;text-underline-offset:4px;min-height:44px;color:inherit;background:0 0;border:0;padding:10px 0;font-size:12px;font-weight:600;text-decoration:underline}.end{text-align:center;color:var(--muted);margin:14px auto 0;display:block}.feedback{border-top:1px solid var(--line);margin-top:28px;padding-top:25px}.feedback .success{color:var(--green)}.feedback .warm{color:var(--warm)}.feedback h3{font-size:23px}.explanations>div{border-bottom:1px solid #e7e8e0;padding:15px 0}.explanations strong{font-size:14px}.explanations p{color:#4d5e60;margin-top:5px;font-size:14px}.feedback>a{margin-top:18px;font-size:12px;display:inline-block}.section-head{justify-content:space-between;align-items:end;gap:30px;margin:8px 0 27px;display:flex}.section-head p{color:var(--muted);font-size:12px}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:19px;display:grid}.topic-card{padding:24px}.topic-top{justify-content:space-between;align-items:center;gap:8px;margin-bottom:20px;display:flex}.topic-icon{font-size:26px;font-weight:700}.topic-card h3{min-height:54px;font-size:20px}.score{align-items:baseline;gap:10px;margin-top:13px;display:flex}.score strong{letter-spacing:-1px;font-size:31px}.score span{color:var(--muted);font-size:11px}.meter{background:#e4e8df;border-radius:5px;height:5px;margin-top:13px;overflow:hidden}.meter i{background:var(--green);height:100%;display:block}.topic-actions{justify-content:space-between;gap:12px;display:flex}.status-mastered{color:#15513a;background:#deeddf}.status-needs-work,.status-needs-review{color:#754217;background:#fae8c9}.concepts{border-top:1px solid var(--line);margin-top:12px;padding:0;list-style:none}.concepts li{margin-top:15px;font-size:12px}.concepts span{color:var(--muted);margin-top:3px;font-size:11px;display:block}.policy{color:var(--muted);padding:24px 0;font-size:13px}.policy p{max-width:800px;margin-top:5px}.install{border-top:1px solid var(--line);align-items:center;gap:18px;margin-top:26px;padding:24px 0;display:flex}.install>span{border:1px solid var(--line);border-radius:12px;flex-shrink:0;place-items:center;width:40px;height:44px;font-size:23px;display:grid}.install strong{font-size:13px}.install p{color:var(--muted);margin-top:3px;font-size:12px}footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;gap:15px;padding:16px 0;font-size:11px;display:flex}footer p{margin:0}.summary{max-width:740px;margin:auto;padding:40px}.summary h2{font-size:38px}.summary-actions{align-items:center;gap:16px;margin-top:24px;display:flex}.summary-actions .primary{max-width:300px;margin:0}.error-banner{background:#f8e5d8;border:1px solid #c17e5e;border-radius:12px;margin-bottom:22px;padding:16px 22px;font-size:14px}.error-banner button{display:block}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}dialog{max-width:min(95vw,1000px);max-height:94dvh;color:var(--ink);background:#fff;border:0;border-radius:18px;padding:20px}dialog::backdrop{background:#152730bb}dialog img{object-fit:contain;max-width:100%;max-height:75dvh;margin:20px auto;display:block}dialog p{color:var(--muted);font-size:12px}.welcome{padding:60px 0}body:has(dialog[open]){overflow:hidden}@media (width<=850px){.edition{display:none}.login-grid{gap:40px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.study-layout{grid-template-columns:1fr}.study-layout aside{display:none}.mini-stats{gap:22px}.start-card{padding:30px}.start-card h2{font-size:36px}}@media (width<=600px){main{padding:0 20px 20px;padding-bottom:calc(20px + env(safe-area-inset-bottom))}.mast{min-height:80px;padding:16px 20px;padding-top:calc(16px + env(safe-area-inset-top))}.brand{font-size:19px}.brand-icon{padding:5px 10px;font-size:25px}.brand small{font-size:8px}.private{font-size:10px}.topline{margin:22px 0 28px}.eyebrow{letter-spacing:1.1px;font-size:9px}.tiny{display:none}.login-grid{grid-template-columns:1fr;gap:30px;padding:0 0 30px}.login-grid h1{letter-spacing:-3px;font-size:59px}.login-grid .lead{font-size:17px}.login-grid>.login{max-width:none}.road-art{margin:24px 0;padding:14px 0}.login-grid>.login{padding:26px}.login-grid>.login h2{font-size:28px}.dashboard-head{margin-bottom:18px;display:block}.dashboard-head h1{letter-spacing:-2px;font-size:39px}.mini-stats{gap:35px;margin-top:23px}.mini-stats strong{font-size:25px}.mini-stats span{font-size:11px}.tabs{gap:23px;margin-bottom:22px}.tabs button{font-size:12px}.start-grid{grid-template-columns:1fr;gap:18px}.start-card{padding:29px}.start-card h2{font-size:38px}.route-card{padding:27px}.question{padding:22px 18px}.question h2{letter-spacing:-.5px;font-size:23px}.question-meta .label{letter-spacing:1px;font-size:9px}.question-meta .pill{font-size:10px}.choice{gap:10px;min-height:65px;padding:14px 12px;font-size:14px}.question-image img{max-height:210px}.section-head{display:block}.section-head h2{font-size:28px}.section-head p{margin-top:12px}.topic-grid{grid-template-columns:1fr;gap:15px}.topic-card h3{min-height:0}.topic-card{padding:24px}.summary{padding:28px 23px}.summary h2{font-size:31px}.summary-actions{flex-direction:column;align-items:stretch}.summary-actions .primary{max-width:none}.install{align-items:flex-start}.install p{line-height:1.7}footer{align-items:flex-start;gap:10px}footer p{max-width:230px}footer a{margin-top:5px;display:block}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}.source-links{flex-wrap:wrap;gap:10px;margin-top:18px;display:flex}.source-links a{font-size:12px}.account{align-items:center;gap:16px;display:flex}.signup h2{font-size:36px}.benefits{color:var(--muted);margin:25px 0;padding-left:20px}.benefits li{padding:6px 0}.signup .text-button{font-size:inherit}.scope-note{border-top:1px solid var(--line);max-width:760px;padding:28px 0}.scope-note p{color:var(--muted);margin-top:8px}.boot{max-width:1136px;margin:80px auto;padding:32px;font-size:24px}.privacy-copy{max-width:800px;padding-top:40px;padding-bottom:60px}.privacy-copy h2{margin-top:32px;font-size:24px}.privacy-copy h1{font-size:48px}.signup{max-width:430px;box-shadow:0 10px 30px #182d3608}@media (width<=600px){.signup{max-width:none}.account{gap:10px}.account>.private{display:none}.signup h2{font-size:30px}}
