:root{color-scheme:light;--ink:#243f48;--muted:#526b70;--green:#216b59;--line:#d6e2dc;--paper:#fffefa;--soft:#f3f6f1;--purple:#76559e;font-family:"Trebuchet MS",Verdana,system-ui,sans-serif;font-size:18px;color:var(--ink);background:var(--soft)}*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:radial-gradient(ellipse at 50% 0,#e4efeb66,transparent 70%);line-height:1.5}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #6452a5;outline-offset:4px}button{min-height:48px;border-radius:15px;padding:11px 19px;border:1px solid var(--line);color:var(--ink);background:white;font-weight:700;transition:background .12s,transform .12s}button:active:not(:disabled){transform:translateY(2px)}.quiet{background:#fffefa}.primary{background:var(--green);color:white;border:1px solid #155641;box-shadow:0 3px 0 #164b3e}.primary:hover{background:#195d4e}header{max-width:950px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:18px 24px;gap:12px}.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px}.logo{font-size:21px;background:#e0eee4;color:#225a4d;border-radius:12px;padding:5px 10px}.island-mark{height:45px;margin:-4px auto 8px;text-align:center}.island-mark svg{height:45px;width:167px}main{max-width:800px;margin:auto;padding:0 24px}.exercise-card{background:var(--paper);border:1px solid #d9e4dd;border-radius:28px;padding:25px 32px 30px;box-shadow:0 9px 35px #254c3a06}.exercise-top,.row{display:flex;align-items:center;justify-content:space-between;gap:12px}.eyebrow{font-size:14px;letter-spacing:.04em;font-weight:800;color:#3e665c}.pill{font-size:13px;color:#4d676b;background:#edf2ee;padding:4px 10px;border-radius:20px}.progress-row{display:flex;align-items:center;gap:12px;margin:15px 0 24px}.bar{height:7px;background:#e7ede8;border-radius:10px;flex:1;overflow:hidden}.fill{height:100%;background:#71a38a;border-radius:inherit;transition:width .2s}#counter{font-size:13px;color:var(--muted);white-space:nowrap}.prompt-row{display:flex;align-items:center;justify-content:center;gap:15px;margin-bottom:24px;min-height:100px}#heroine{width:80px;height:100px;object-fit:contain;flex:0 0 auto;transform-origin:center bottom}#heroine.react{animation:cheer .55s ease-out 1}h1{font-size:clamp(21px,3.1vw,29px);margin:0 0 6px;font-weight:800;line-height:1.3}.subtle{color:var(--muted);font-size:16px;margin:0}.question{font-size:clamp(25px,4.6vw,37px);line-height:1.65;font-weight:700;letter-spacing:.005em;margin:8px 0 26px;text-align:center;overflow-wrap:anywhere}.blank{display:inline-block;min-width:90px;padding:0 10px;color:#67528a;border-bottom:3px solid #b9a5cf;background:#f1edf6;border-radius:8px 8px 0 0}.options{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:12px 0 24px}.option{min-height:105px;padding:22px 10px;font-size:clamp(26px,4.4vw,39px);font-weight:800;letter-spacing:.01em;background:#fff;border:2px solid #d8e3dc;border-radius:20px;box-shadow:0 4px 0 #dfe7e1;overflow-wrap:anywhere;line-height:1.3}.option:hover:not(:disabled){background:#f0f6f0;border-color:#96b4a0}.option.correct{background:#e6f2df;border-color:#5e8a55;color:#294f2a;box-shadow:0 4px 0 #b8cfac}.option.wrong{background:#f7eddc;border-color:#b38b52;color:#634c2b;box-shadow:0 4px 0 #e0caab}.option:disabled{opacity:1}.feedback{padding:19px 22px;background:#f0f4ec;border:1px solid #d8e3cf;border-radius:16px;color:#2f4d39;font-size:17px;line-height:1.65}.feedback strong{display:block;font-size:20px;margin-bottom:5px}.feedback p{margin:5px 0}.feedback .example{margin-top:10px;padding-top:9px;border-top:1px solid #d6e0ce}.next{display:block;width:100%;margin-top:18px}.hidden,[hidden]{display:none!important}footer{text-align:center;color:#526a67;font-size:13px;padding:20px}.victory{text-align:center;padding:12px 0 20px}.victory img{object-fit:contain}.victory h2{font-size:30px;margin:8px 0}.victory p{margin:12px 0}.victory .quiet{margin-top:10px}dialog{color:var(--ink);border:1px solid #d5e0d9;border-radius:24px;background:var(--paper);padding:26px;width:min(620px,calc(100% - 24px));max-height:calc(100dvh - 32px);overflow-y:auto;box-shadow:0 15px 80px #213d3b25}dialog::backdrop{background:#25444266;backdrop-filter:blur(3px)}dialog h2{margin:0;font-size:25px}dialog label:not(.motion-setting){display:block;font-weight:700;margin:18px 0 7px}input:not([type=checkbox]),select{width:100%;min-height:48px;border:1px solid #b8cbc0;border-radius:10px;padding:10px 12px;background:white;color:var(--ink)}dialog .primary{margin-top:17px}fieldset{padding:0;border:0;margin:24px 0 18px}legend{font-size:17px;font-weight:800;margin-bottom:12px}.mode-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mode{text-align:left;background:#fff}.mode small{display:block;font-size:12px;font-weight:400;margin-top:5px;line-height:1.45}.mode.active{background:#e9f0e5;border:2px solid #739875;padding:10px 18px}.filters{display:flex;flex-wrap:wrap;gap:9px}.filter{font-size:14px;min-height:46px;padding:9px 13px;border-radius:12px}.filter.active{border:2px solid #739875;background:#edf3e8;padding:8px 12px}details{margin:20px 0;padding-top:16px;border-top:1px solid var(--line)}summary{cursor:pointer;font-weight:700;padding:5px 0;min-height:40px}.tiny{font-size:13px;color:#526b64;line-height:1.65}.menu-actions{display:grid;gap:12px;margin:20px 0}.motion-setting{display:flex;gap:10px;align-items:center;min-height:48px;font-size:15px}.motion-setting input{width:22px;height:22px;accent-color:var(--green)}.swim-link{display:flex;gap:12px;align-items:center;background:#e7f0f2;color:#214e63;border-radius:18px;text-decoration:none;font-weight:800;padding:10px 16px;min-height:82px}.swim-symbol{width:70px;height:65px;flex-shrink:0}.dots{display:flex;gap:6px;flex-wrap:wrap}.dot{width:10px;height:10px;border-radius:50%;background:#e1e9df}.dot.done{background:#69966b}a{color:#245b76;text-underline-offset:3px}.pedagogy{font-size:14px;line-height:1.65}.install-close{float:right}.install-sheet ol{padding-left:25px}.install-sheet li{margin:14px 0}.boot-screen{position:fixed;inset:0;z-index:10000;background:#f3f6f1;display:grid;place-items:center;color:#245e59}.boot-content{text-align:center;padding:24px}.boot-content img{width:88px;height:88px;border-radius:22px}.boot-content p{font-size:16px;font-weight:700}.boot-track{height:8px;width:min(260px,75vw);margin:18px auto;background:#dce9df;border-radius:20px;overflow:hidden}.boot-track span{display:block;width:40%;height:100%;background:#8b77a5;border-radius:20px;animation:loading 1s ease-in-out infinite alternate}@keyframes loading{from{transform:translateX(-90%)}to{transform:translateX(250%)}}@keyframes cheer{40%{transform:translateY(-4px) rotate(2deg)}70%{transform:rotate(-1deg)}}
@media(max-width:560px){:root{font-size:17px}header{padding:12px 14px}.brand{font-size:16px;gap:7px}.logo{font-size:18px;padding:4px 8px}#openMenu{padding:9px 13px;font-size:15px}main{padding:0 12px}.island-mark{height:32px;margin:0 auto 5px}.island-mark svg{height:32px;width:130px}.exercise-card{padding:19px 16px 24px;border-radius:23px}.progress-row{margin:12px 0 18px}.prompt-row{gap:10px;margin-bottom:19px;min-height:82px}#heroine{width:62px;height:82px}h1{font-size:21px}.subtle{font-size:14px}.options{gap:12px;margin-bottom:20px}.option{font-size:clamp(23px,6.4vw,33px);min-height:91px;padding:17px 7px;border-radius:16px}.feedback{padding:15px;font-size:16px}.feedback strong{font-size:18px}.question{font-size:27px;line-height:1.65;margin:0 0 22px}.pill{font-size:12px;padding:3px 8px}.eyebrow{font-size:12px}#counter{font-size:12px}dialog{padding:20px}.mode-buttons{gap:8px}.mode{padding:11px 12px;font-size:15px}.mode.active{padding:10px 11px}.mode small{font-size:11px}.row h2{font-size:24px}footer{padding:16px}}
@media(max-width:350px){.options{grid-template-columns:1fr}.option{min-height:70px}.brand{font-size:14px}.pill{max-width:140px}}
@media(max-height:650px) and (min-width:600px){header{padding-block:10px}.island-mark{height:25px}.island-mark svg{height:25px}.exercise-card{padding-block:17px}.progress-row{margin:10px 0}.prompt-row{min-height:68px;margin-bottom:12px}#heroine{height:70px;width:58px}.option{min-height:80px;padding:15px}.question{margin-bottom:14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}body.reduce-motion *,body.reduce-motion *::before,body.reduce-motion *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}

@media(max-width:560px){.options.long-words{grid-template-columns:1fr}.options.long-words .option{min-height:76px;font-size:29px;padding:14px 10px}}

/* Prominent swimming entry at the top of the menu. */
#menuDialog .swim-link{margin:20px 0 24px;padding:15px 18px;min-height:98px;background:linear-gradient(120deg,#087e96,#116c85);color:#fff;font-size:clamp(18px,4.5vw,23px);border:2px solid #77d7df;box-shadow:0 5px 0 #075265;gap:16px}#menuDialog .swim-link::after{content:"→";margin-left:auto;font-size:28px}#menuDialog .swim-symbol{width:82px;height:72px}#menuDialog .swim-link:hover{background:#086b82}#menuDialog .swim-link:focus-visible{outline:3px solid #e5ad45;outline-offset:5px}