:root{color-scheme:light;--bg:#f2f6f8;--paper:#fff;--ink:#20313b;--muted:#576b76;--line:#d9e3e8;--teal:#087787;--teal-dark:#05606e;--tint:#e6f4f5;--green:#176c42;--green-bg:#e8f5ec;--red:#a43c28;--red-bg:#fff0ea;--amber:#795707;--amber-bg:#fff6d9;font-family:ui-rounded,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5;font-size:16px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:var(--teal)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #087787;outline-offset:4px}button{color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:12px;min-height:48px;padding:12px 16px;line-height:1.35}input,select{color:var(--ink);width:100%;border:1px solid #bacbd3;background:var(--paper);border-radius:10px;padding:13px 14px;font-size:16px;min-height:48px}input:invalid:not(:placeholder-shown){border-color:#bacbd3}label{display:block;font-weight:600;margin:0 0 7px}small,.muted{color:var(--muted)}small{font-size:13px;line-height:1.6}small.block{display:block}h1{font-size:clamp(28px,5vw,38px);letter-spacing:-1px;line-height:1.18;margin:8px 0 18px}h2{font-size:23px;line-height:1.3;letter-spacing:-.3px;margin:0 0 12px}h3{font-size:18px;line-height:1.35;margin:0 0 8px}p{margin:0 0 18px;line-height:1.65}p:last-child{margin-bottom:0}.app{max-width:920px;margin:auto;padding:0 28px}.top{padding:24px 0;display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:750;letter-spacing:-.3px;font-size:21px}.brand small{font-weight:400;display:block;font-size:12px;letter-spacing:0}.brand-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:var(--teal);color:white;font-size:20px;letter-spacing:-2px;font-weight:700;padding-right:2px}#account{display:flex;align-items:center;gap:10px}#account small{font-size:14px}#account button{min-height:44px;padding:8px 12px;font-size:13px}main{padding:36px 0 26px;min-height:62vh;outline:none}.narrow{max-width:520px;margin:auto}.eyebrow{display:block;font-size:12px;font-weight:750;letter-spacing:1.3px;text-transform:uppercase;color:var(--teal);margin-bottom:8px}.lead{font-size:18px;color:var(--muted);max-width:600px}.back{padding:0;min-height:44px;display:inline-flex;align-items:center;border:0;background:transparent;color:var(--teal);margin-bottom:16px;font-size:14px;gap:6px}.panel{padding:24px;border-radius:16px;background:var(--paper);border:1px solid var(--line)}.tint{background:var(--tint);border-color:transparent}.stack{display:grid;gap:14px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.form-grid{display:grid;gap:18px}.form-error{background:var(--red-bg);color:var(--red);border-radius:10px;padding:12px 16px;margin:12px 0}.primary{background:var(--teal);border-color:var(--teal);color:white;font-weight:650}.primary:hover:not(:disabled){background:var(--teal-dark)}.secondary{background:var(--tint);color:var(--teal);border-color:transparent}.full{width:100%}.link-button{border:0;background:transparent;color:var(--teal);text-decoration:underline;padding:10px 0}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.row.spread{justify-content:space-between}.section-title{margin:28px 0 14px}.profile{display:flex;gap:16px;align-items:center;padding:18px;text-align:left}.avatar{display:grid;place-items:center;border-radius:50%;background:var(--tint);color:var(--teal);width:48px;height:48px;flex-shrink:0;font-weight:700;font-size:20px}.profile span:last-child,.tile .tile-copy{flex:1}.profile strong,.tile strong{display:block}.profile small,.tile small{display:block;margin-top:3px}.tile{width:100%;text-align:left;display:flex;gap:16px;align-items:center;padding:20px;background:var(--paper)}.tile .arrow{color:var(--muted);font-size:23px}.circle{border:2px solid var(--teal);color:var(--teal);border-radius:50%;width:50px;height:50px;display:grid;place-items:center;flex-shrink:0;font-weight:700}.circle.done{background:var(--teal);color:white}.tag{display:inline-block;border-radius:8px;padding:5px 9px;font-size:12px;font-weight:600;background:var(--tint);color:var(--teal)}.tag.good{background:var(--green-bg);color:var(--green)}.tag.warn{background:var(--amber-bg);color:var(--amber)}.mode-badge{width:44px;height:44px;border-radius:12px;background:var(--tint);color:var(--teal);display:grid;place-items:center;font-size:20px}.learning-text{font-size:18px;line-height:1.8}.example{padding:14px 0;border-bottom:1px solid var(--line)}.example:last-child{border:0}.example strong{display:block;font-size:22px;line-height:1.4;font-weight:650;margin-bottom:6px}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:22px 0}.controls label{font-size:13px;margin:0}.controls select{width:auto;min-width:95px;padding:8px;min-height:44px}.track{height:8px;border-radius:8px;overflow:hidden;background:#dfe8eb;margin:12px 0 28px}.track>span{height:100%;display:block;background:var(--teal);transition:width .2s}.track[data-step="0"]>span{width:0}.track[data-step="1"]>span{width:10%}.track[data-step="2"]>span{width:20%}.track[data-step="3"]>span{width:30%}.track[data-step="4"]>span{width:40%}.track[data-step="5"]>span{width:50%}.track[data-step="6"]>span{width:60%}.track[data-step="7"]>span{width:70%}.track[data-step="8"]>span{width:80%}.track[data-step="9"]>span{width:90%}.track[data-step="10"]>span{width:100%}.question{font-size:clamp(24px,5vw,32px);line-height:1.5;font-weight:650;letter-spacing:-.3px;margin:26px 0}.options{display:grid;gap:12px}.options button{text-align:left;padding:17px;display:flex;gap:14px;align-items:center}.option-letter{background:var(--bg);border:1px solid var(--line);border-radius:7px;padding:2px 8px;font-size:12px}.options button[aria-pressed="true"]{background:var(--tint);border:2px solid var(--teal);padding:16px}.feedback{padding:20px;border-radius:14px;background:var(--green-bg);color:var(--green);margin:20px 0}.feedback.wrong{background:var(--red-bg);color:var(--red)}.feedback p{margin-top:8px}.actions{margin-top:24px;display:grid;gap:12px}.score{font-size:72px;line-height:1.2;font-weight:750;letter-spacing:-3px;margin:20px 0 4px}.score span{font-size:30px;letter-spacing:-1px;color:var(--muted)}.notice-box{background:var(--amber-bg);color:var(--amber);padding:16px;border-radius:12px;font-size:14px;line-height:1.6}.chat{padding:20px;background:var(--tint);border-radius:16px;line-height:1.6;margin-bottom:16px}.chat .label{font-size:12px;color:var(--muted);margin-bottom:10px}.chat .utterance{font-size:22px;font-weight:600;line-height:1.5}.chat.correction{background:var(--amber-bg)}.vocab-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.word{padding:14px;border:1px solid var(--line);border-radius:12px}.word strong,.word small{display:block}.word .country-code{font-size:11px;letter-spacing:1px;color:var(--muted);margin-bottom:6px}.history{list-style:none;margin:0;padding:0}.history li{padding:16px 0;border-bottom:1px solid var(--line)}.history li:last-child{border:0}.history .title{display:flex;justify-content:space-between;gap:14px}.history small{display:block;margin-top:4px}.navigation{position:sticky;bottom:12px;display:flex;gap:6px;padding:7px;border:1px solid var(--line);border-radius:16px;background:#fffffff5;box-shadow:0 6px 24px #20313b0d;max-width:520px;margin:0 auto;z-index:5}.navigation button{flex:1;border:0;background:transparent;font-size:14px;min-width:0;padding:12px 8px}.navigation button[aria-current="page"]{background:var(--tint);color:var(--teal);font-weight:650}.footer{font-size:12px;color:var(--muted);display:flex;gap:8px;align-items:center;justify-content:center;padding:28px 0 calc(22px + env(safe-area-inset-bottom));flex-wrap:wrap}.release{opacity:.75}.connection{background:var(--amber-bg);color:var(--amber);padding:12px 16px;font-size:14px;border-radius:10px;margin-top:16px}.connection button{padding:4px 8px;min-height:32px;font-size:13px}.toast{position:fixed;bottom:100px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;max-width:min(90vw,520px);width:max-content;padding:14px 20px;border-radius:12px;z-index:20;font-size:14px;box-shadow:0 8px 28px #20313b30}.loading{padding:80px 0;text-align:center;color:var(--muted)}.pin-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.install{margin-top:24px;font-size:14px}.divider{border:0;border-top:1px solid var(--line);margin:24px 0}[hidden]{display:none!important}.state-message{text-align:center;padding:40px 14px}.state-message h2{margin:10px 0}.word-list{margin-top:22px}.parent-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}.parent-tabs button[aria-pressed="true"]{background:var(--teal);color:white}.meta{font-size:13px}.error-page{padding:24px;background:var(--paper);border-radius:16px}.audio-label{font-size:13px;min-height:24px;color:var(--muted)}
@media(min-width:760px){.hero{padding:30px;background:var(--tint);border-radius:20px;margin-bottom:30px}.hero p{max-width:520px}.hero .primary{width:auto;min-width:220px}.mode-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}.mode-grid .tile{display:block;padding:24px 18px}.mode-grid .mode-badge{margin-bottom:18px}.mode-grid .arrow{display:none}.mode-grid small{margin-top:8px}}
@media(max-width:600px){.app{padding:0 20px}.top{padding:18px 0}.brand{font-size:18px;gap:9px}.brand-icon{width:39px;height:39px;font-size:18px}.brand small{font-size:11px}#account{gap:6px}#account small{font-size:12px}#account button{font-size:12px;padding:7px 9px}main{padding:28px 0 22px}.grid{grid-template-columns:1fr}.panel{padding:20px}.vocab-grid{grid-template-columns:1fr 1fr}.word{padding:12px}.pin-row{grid-template-columns:1fr}.navigation{bottom:calc(8px + env(safe-area-inset-bottom))}.learning-text{font-size:17px}.hero h1{max-width:320px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.lesson-audio{margin:24px 0}.lesson-audio audio{display:block;width:100%;margin:12px 0}.lesson-audio details{margin-top:16px}.lesson-audio summary{cursor:pointer;font-weight:600}.audio-transcript{white-space:pre-line;line-height:1.7}

.example-with-audio{display:flex;align-items:center;gap:12px}.example-with-audio>div{min-width:0;flex:1}.example-play{flex:0 0 44px;width:44px;min-height:44px;padding:8px;border:1px solid var(--teal);color:var(--teal);background:transparent;border-radius:50%;touch-action:manipulation}.example-play:focus-visible{outline:3px solid var(--teal);outline-offset:3px}