:root{--purple:#5b389e;--ink:#302143;--muted:#79698b;--bg:#f6f1fd;--yellow:#ffe996;--pink:#ffdfed;--line:#e7dcf3;--surface:#fff;--bottom:0px;--top:0px;color-scheme:light;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:#eee8f7;color:var(--ink)}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;border-radius:15px;padding:14px 18px;background:var(--purple);color:#fff;font-size:14px;font-weight:650;min-height:46px}button:disabled{opacity:.5;cursor:default}button.secondary{background:var(--surface);border:1px solid var(--line);color:var(--purple)}button.small{font-size:12px;padding:10px 13px;min-height:40px}button:focus-visible,a:focus-visible{outline:3px solid #c594ee;outline-offset:3px}a{color:var(--purple)}.shell{max-width:520px;margin:auto;min-height:100dvh;background:var(--bg)}header{display:flex;align-items:center;justify-content:space-between;padding:calc(23px + var(--top)) 22px 20px;background:var(--surface)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink)}.logo{display:grid;place-items:center;width:47px;height:47px;border-radius:15px;background:var(--purple);color:var(--yellow);font-weight:800;font-size:31px;transform:rotate(-5deg)}.brand b{font-size:29px;letter-spacing:-1.8px;color:#21152e}.dot{color:var(--purple)}.brand small{display:block;font-size:11px;letter-spacing:.2px;color:var(--muted);margin-top:2px}.platform{font-size:10px;font-weight:650;background:var(--bg);color:var(--muted);border-radius:20px;padding:7px 10px}.sandbox{display:flex;align-items:center;gap:7px;padding:9px 20px;border-block:1px solid var(--line);font-size:10px;color:var(--muted);letter-spacing:.1px}.sandbox button{margin-left:auto;padding:0;min-height:24px;background:transparent;color:var(--purple);font-size:18px}.status-dot{width:6px;height:6px;background:#b39cce;border-radius:100%}main{padding:22px 20px 0;min-height:65vh}h1,h2,h3,p{margin-top:0}h1{font-size:28px;letter-spacing:-1px;margin-bottom:8px}h2{font-size:20px;letter-spacing:-.4px;margin-bottom:10px}h3{font-size:17px;margin-bottom:7px}p{font-size:14px;line-height:1.6}small,.muted{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;margin-bottom:14px}.hero{background:var(--purple);color:#fff;border-radius:25px;padding:26px 24px;margin-bottom:18px}.hero h1{font-size:33px;letter-spacing:-1.3px}.hero p{color:#eee1ff;font-size:14px;margin:12px 0 22px}.hero .pill{background:var(--yellow);color:var(--ink)}.hero-bottom{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#eee1ff}.pill{display:inline-block;border-radius:20px;padding:6px 11px;font-size:11px;font-weight:650;background:#eee5fb;color:var(--purple)}.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.card{padding:22px;border:1px solid var(--line);border-radius:23px;background:var(--surface);margin-bottom:15px}.grid .card{margin:0;padding:20px 17px;border:none}.yellow{background:var(--yellow);border-color:transparent}.pink{background:var(--pink);border-color:transparent}.kicker{font-size:12px;font-weight:650;margin-bottom:15px}.big-number{font-size:30px;font-weight:750;letter-spacing:-1px;margin-bottom:5px}.grid p{font-size:12px;margin-bottom:18px}.grid button{width:100%;background:rgba(255,255,255,.8);color:var(--ink);padding:11px 8px;font-size:12px;border-radius:12px}.row{display:flex;align-items:center;justify-content:space-between;gap:14px}.row p{margin-bottom:0}.section-head{margin:26px 0 13px}.lesson-row{display:flex;align-items:center;gap:13px;padding:15px 0;border-top:1px solid var(--line)}.lesson-row:first-of-type{border-top:0}.tile{display:grid;place-items:center;flex:0 0 42px;height:42px;border-radius:13px;background:#eee4fb;color:var(--purple);font-size:20px}.lesson-row h3{font-size:14px;margin-bottom:5px}.lesson-row p{font-size:11px;color:var(--muted);margin:0}.lesson-row .arrow{margin-left:auto;background:transparent;color:var(--purple);padding:5px;min-height:30px}.balance-note{font-size:11px;margin-top:12px;color:var(--muted)}nav{display:flex;position:sticky;bottom:0;z-index:4;justify-content:space-around;margin-top:22px;padding:10px 10px calc(10px + max(env(safe-area-inset-bottom),var(--bottom)));border-top:1px solid var(--line);background:var(--surface)}nav a{display:grid;justify-items:center;gap:5px;flex:1;padding:7px 1px;text-decoration:none;color:var(--muted);font-size:10px;font-weight:600;border-radius:12px}nav a.active{background:#f0e7fc;color:var(--purple)}nav svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}footer{text-align:center;color:var(--muted);font-size:9px;padding:14px 12px 18px;line-height:1.5}.page-intro{color:var(--muted);font-size:13px;margin-bottom:22px}.word{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:16px 0;border-top:1px solid var(--line)}.word strong{font-size:18px;display:block}.word p{font-size:13px;color:var(--muted);margin:5px 0}.word small{font-size:10px}.word button{flex-shrink:0;font-size:11px;padding:10px 11px;min-height:39px}.search{margin:10px 0 15px}input,textarea,select{width:100%;padding:13px 14px;background:var(--surface);border:1px solid #d9cce9;border-radius:12px;color:var(--ink);font-size:15px;outline-color:#a17acd}textarea{resize:vertical;min-height:110px}label{display:block;font-size:12px;font-weight:600;margin:15px 0 8px}details summary{font-size:14px;font-weight:650;cursor:pointer}details form{margin-top:18px}.question{padding:18px 0;border-top:1px solid var(--line)}.question h2{font-size:16px;line-height:1.6;letter-spacing:0;white-space:pre-line}.question-number{font-size:10px;color:var(--muted);letter-spacing:1px;margin-bottom:10px}.option{display:flex;align-items:center;gap:10px;font-weight:400;font-size:14px;padding:14px;background:var(--surface);border:1px solid var(--line);border-radius:12px;margin:8px 0}.option:has(input:checked){border-color:var(--purple);background:#f2eafa}.option input{width:17px;height:17px;flex-shrink:0;accent-color:var(--purple)}.wide{width:100%;margin-top:16px}.draft{font-size:11px;color:var(--muted);margin:12px 0}.error{color:#a93150;font-size:12px}.success{background:#e8f3e8;padding:12px;border-radius:12px;font-size:13px}.feedback{padding:13px;border-radius:13px;background:#f3edf9;font-size:13px;line-height:1.6;margin-top:12px}.result{margin:15px 0}.result p{margin:8px 0;font-size:13px;white-space:pre-wrap}.result.correct{border-left:3px solid #5f946b;padding-left:13px}.result.incorrect{border-left:3px solid #cb7188;padding-left:13px}.bar{height:9px;border-radius:8px;background:#e9ddf6;overflow:hidden;margin:12px 0}.bar span{height:100%;display:block;background:var(--purple);border-radius:8px}.metric{font-size:28px;font-weight:750;letter-spacing:-.7px}.history{padding:14px 0;border-top:1px solid var(--line);font-size:13px}.history small{display:block;margin-top:5px}dialog{border:1px solid var(--line);border-radius:25px;padding:27px;max-width:380px;width:90%;color:var(--ink);background:var(--surface)}dialog::backdrop{background:#25153788}dialog button{width:100%;margin-top:10px}#toast{position:fixed;left:50%;bottom:95px;transform:translateX(-50%);z-index:20;background:#302143;color:white;border-radius:15px;padding:13px 20px;font-size:13px;max-width:90%;display:none;box-shadow:0 5px 25px #30214333}#toast.show{display:block}a,button{touch-action:manipulation}.empty{font-size:13px;color:var(--muted);padding:20px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(min-width:600px){.shell{margin:25px auto;border:1px solid var(--line);border-radius:30px;overflow:clip;box-shadow:0 15px 80px #45246714;min-height:calc(100dvh - 50px)}}@media(max-width:350px){main{padding-inline:14px}.grid{gap:8px}.grid .card{padding:16px 12px}.brand b{font-size:25px}.sandbox{padding-inline:14px;font-size:9px}.big-number{font-size:25px}}@media(prefers-reduced-motion:no-preference){button,a{transition:background .15s ease,opacity .15s ease}.hero{animation:arrive .2s ease-out}@keyframes arrive{from{opacity:.6;transform:translateY(4px)}to{opacity:1;transform:none}}}

.role-switch{display:flex;align-items:center;gap:6px;margin-bottom:18px}.role-switch span{font-size:10px;color:var(--muted);margin-right:auto}.role-switch button{min-height:34px;padding:8px 13px;font-size:11px;background:var(--surface);color:var(--muted);border:1px solid var(--line)}.role-switch button.chosen{background:var(--purple);color:white}.answer-text{white-space:pre-wrap}