:root{--paper:#faf8f1;--surface:#fffefa;--ink:#233e37;--muted:#596b61;--green:#204f46;--line:#d8dfd4;--soft:#edf2e9;--orange:#a84828;--error:#963921;--radius:12px;color-scheme:light;font-family:'Segoe UI',sans-serif;color:var(--ink);background:var(--paper);font-size:16px;line-height:1.5;scrollbar-color:#94a298 var(--paper)}
*{box-sizing:border-box}body{margin:0}::selection{background:#e7c77c;color:var(--ink)}[hidden]{display:none!important}a{color:var(--green);text-underline-offset:4px}button,input,select{font:inherit;caret-color:var(--green)}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.6;cursor:default}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:4px}h1,h2,h3,p{margin:0}h1{font-size:30px;font-weight:650;line-height:1.2;letter-spacing:-.025em;text-wrap:balance}h2{font-size:23px;font-weight:600;line-height:1.3;text-wrap:balance}h3{font-size:18px;font-weight:600}p{max-width:68ch}svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}header,nav,main{max-width:1184px;margin:auto}header{padding:24px 32px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none}.brand strong{display:block;font-size:20px;font-weight:650}.brand small{display:block;font-size:12px;color:var(--muted);margin-top:2px}#account{font-size:13px;text-align:right;max-width:200px;overflow-wrap:anywhere}nav{display:flex;gap:32px;padding:0 32px}nav a{display:flex;gap:8px;align-items:center;padding:14px 0;min-height:48px;text-decoration:none;font-size:15px;color:var(--muted);border-bottom:3px solid transparent}nav a[aria-current]{color:var(--green);border-bottom-color:var(--green);font-weight:600}nav svg{display:none}main{padding:32px 32px 64px;border-top:1px solid var(--line);min-height:70vh}.page-head{margin-bottom:28px}.page-head p{margin-top:10px;color:var(--muted)}.primary,.secondary,.quiet{min-height:48px;border-radius:8px;padding:11px 20px;font-weight:600;border:1px solid var(--green);display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}.primary{background:var(--green);color:white}.secondary{background:transparent;color:var(--green);border-color:#9aac9f}.quiet{border-color:transparent;background:transparent;color:var(--green);padding-inline:8px}.primary:hover:not(:disabled){background:#163e36}.secondary:hover:not(:disabled),.quiet:hover:not(:disabled){background:var(--soft)}.study-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(260px,1fr);gap:64px;align-items:start}.today{padding:30px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.today>p{margin:12px 0;color:var(--muted)}.previews{display:flex;gap:14px;margin:28px 0;align-items:center}.previews img{width:calc((100% - 56px)/5);max-width:84px;aspect-ratio:1;object-fit:contain;background:white;border-radius:4px;padding:4px}.lesson-meta{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:13px;color:var(--muted);margin:20px 0}.course h2{font-size:18px;margin:0 0 12px}.course-row{padding:16px 0;border-bottom:1px solid var(--line)}.row-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:14px}.row-heading button{background:transparent;border:0;padding:4px 0;color:var(--green);font-weight:600;min-height:36px;text-align:left}.row-heading span{color:var(--muted);font-size:13px;white-space:nowrap;font-variant-numeric:tabular-nums}progress{display:block;width:100%;height:5px;margin-top:8px;border:0;accent-color:var(--green);background:var(--line);border-radius:3px}progress::-webkit-progress-bar{background:var(--line);border-radius:3px}progress::-webkit-progress-value{background:var(--green);border-radius:3px}progress::-moz-progress-bar{background:var(--green);border-radius:3px}.course-note,.small{font-size:13px;color:var(--muted)}.course-note{margin-top:16px}.shortcut{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:24px 0;margin-top:32px}.shortcut h2{font-size:18px}.shortcut p{font-size:14px;color:var(--muted);margin-top:6px}.shortcut a{flex-shrink:0}.session{max-width:720px;margin:auto}.session-top{display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--muted);font-size:14px}.session-top button{min-height:44px}.session progress{margin:8px 0 20px}.flashcard{padding:24px 32px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);text-align:center}.sign-image{display:block;width:200px;height:205px;object-fit:contain;background:white;margin:0 auto 24px;padding:10px;border-radius:6px}.flashcard h1,.flashcard h2{font-size:26px}.flashcard p{margin:12px auto 0;font-size:18px}.flashcard .category{font-size:13px;color:var(--muted);margin:16px 0 0}.actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:12px;margin-top:24px}.actions .primary{min-width:130px}.helper{font-size:13px;color:var(--muted);margin-top:16px}.source-link{display:inline-block;margin-top:16px;font-size:12px}.question{font-size:23px;text-align:center;margin:24px 0 20px}.quiz-stimulus{padding:12px}.quiz-stimulus .sign-image{margin-bottom:0}.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px}.choice{min-height:70px;text-align:left;display:flex;align-items:center;gap:12px;padding:15px 18px;background:var(--surface);color:var(--ink);border:1px solid #9aac9f;border-radius:8px}.choice:hover:not(:disabled){background:var(--soft);border-color:var(--green)}.choice .number{color:var(--muted);font-size:13px}.choice.image-choice{min-height:132px;justify-content:center}.image-choice img{width:94px;height:94px;object-fit:contain}.choice.correct{border:2px solid var(--green);background:var(--soft);opacity:1}.choice.incorrect{border:2px solid var(--error);background:#fff2ec;opacity:1}.choice:disabled{opacity:.75}.feedback{padding:20px 0;margin-top:20px;border-top:1px solid var(--line)}.feedback h2{font-size:20px}.feedback p{margin-top:8px}.feedback.error h2{color:var(--error)}.feedback .actions{margin-top:16px}.inline-error{color:var(--error);padding:16px 0}.toolbar{display:flex;gap:16px;flex-wrap:wrap;align-items:end;margin-bottom:24px}.toolbar label{font-size:13px;color:var(--muted);display:grid;gap:6px;flex:1;min-width:180px}.toolbar label:first-child{flex:2}input,select{width:100%;min-height:48px;background:var(--surface);color:var(--ink);border:1px solid #9aac9f;border-radius:8px;padding:10px 12px}input::placeholder{color:var(--muted)}.sign-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0 24px}.sign-tile{display:flex;align-items:center;flex-direction:column;text-align:center;gap:12px;padding:24px 4px 18px;text-decoration:none;border-bottom:1px solid var(--line);font-size:14px;line-height:1.35}.sign-tile:hover{background:var(--soft)}.sign-tile img{width:90px;height:98px;object-fit:contain;background:white;padding:3px}.sign-tile small{font-size:11px;color:var(--muted);margin-top:auto}.result-count{font-size:13px;color:var(--muted);margin-bottom:8px}.empty{padding:32px 0}.empty p{margin:12px 0 20px;color:var(--muted)}.detail{max-width:720px;margin:auto}.detail>.quiet{margin-bottom:16px}.detail .flashcard{padding-block:32px}.practice-setup{max-width:760px}.practice-setup .toolbar{margin:24px 0}.summary{max-width:720px;margin:auto;padding:32px 0}.summary p{margin-top:16px}.summary .summary-signs{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}.summary-signs img{width:65px;height:70px;object-fit:contain;background:white;padding:5px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin:32px 0}.stat{border-top:1px solid var(--line);padding:16px 0}.stat strong{display:block;font-size:30px;font-weight:600;font-variant-numeric:tabular-nums}.stat span{display:block;font-size:14px;color:var(--muted)}.progress-section{margin-top:32px}.progress-section>p{margin:12px 0;color:var(--muted)}.mistakes-list{padding:0;list-style:none;max-width:740px}.mistakes-list li{border-bottom:1px solid var(--line)}.mistakes-list a{display:flex;align-items:center;gap:16px;padding:12px 0;text-decoration:none}.mistakes-list img{width:46px;height:46px;object-fit:contain;background:white}.reading{max-width:760px}.reading h2{margin:32px 0 12px;font-size:20px}.reading p+p{margin-top:16px}.reading li{margin:12px 0}.reading dl{display:grid;grid-template-columns:140px 1fr;gap:12px;margin-top:20px}.reading dd{margin:0}.reading dt{color:var(--muted)}.loading{padding:32px 0;color:var(--muted)}#notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);padding:14px 20px;border-radius:8px;background:var(--ink);color:white;box-shadow:0 5px 20px #233e3730;z-index:10;font-size:14px}.skip{position:absolute;left:16px;top:-100px;background:var(--surface);padding:12px;z-index:20}.skip:focus{top:8px}.tabular{font-variant-numeric:tabular-nums}details{margin-top:24px}summary{cursor:pointer;min-height:44px;display:list-item;padding:10px 0}details p{color:var(--muted);font-size:14px}
@media(max-width:900px){.study-layout{gap:32px;grid-template-columns:1.3fr 1fr}.today{padding:24px}.sign-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:0 16px}}
@media(max-width:650px){header{padding:20px;gap:12px}.brand{gap:10px}.brand strong{font-size:17px}.brand small{font-size:11px}.brand img{width:34px;height:34px}#account{font-size:12px;max-width:85px}main{padding:24px 20px calc(100px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}h1{font-size:26px}nav{position:fixed;bottom:0;left:0;right:0;background:var(--paper);border-top:1px solid var(--line);padding:0 8px env(safe-area-inset-bottom);gap:0;z-index:5;justify-content:space-between}nav a{flex:1;min-width:0;flex-direction:column;gap:4px;font-size:11px;padding:10px 2px 8px;border-bottom:0;min-height:64px}nav a[aria-current]{background:var(--soft)}nav svg{display:block}.study-layout{display:flex;flex-direction:column;gap:28px}.today,.course{width:100%}.today{padding:22px}.today h2{font-size:24px}.previews{gap:10px;margin:24px 0}.previews img{width:calc((100% - 40px)/5);padding:2px}.shortcut{align-items:flex-start;flex-direction:column;gap:12px}.page-head{margin-bottom:22px}.flashcard{padding:20px}.flashcard h1,.flashcard h2{font-size:23px}.flashcard p{font-size:16px}.sign-image{width:160px;height:165px;margin-bottom:20px}.actions{gap:10px}.actions button{flex:1}.session-top{font-size:13px}.choices{gap:10px}.choice{min-height:76px;font-size:14px;padding:12px;gap:8px}.choice.image-choice{min-height:112px}.image-choice img{width:80px;height:80px}.question{font-size:21px;margin-top:18px}.quiz-stimulus{padding:0}.quiz-stimulus .sign-image{width:140px;height:140px;margin-bottom:20px}.feedback{margin-top:16px;padding-top:16px}.sign-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:0 12px}.sign-tile{font-size:12px;padding:18px 0 14px;gap:10px}.sign-tile img{width:74px;height:80px}.toolbar{gap:12px}.toolbar label{min-width:130px}.toolbar label:first-child{min-width:100%}.stats{grid-template-columns:1fr 1fr;gap:8px 24px}.stat strong{font-size:28px}.reading dl{grid-template-columns:1fr;gap:4px}.reading dd{margin-bottom:12px}#notice{bottom:calc(80px + env(safe-area-inset-bottom))}html{scroll-padding-bottom:90px}.detail .flashcard{padding:24px 20px}}
@media(max-width:360px){header{padding:16px}.brand strong{font-size:15px}.brand small{font-size:11px}main{padding-inline:16px}.today{padding:18px}.choices{grid-template-columns:1fr}.choices:has(.image-choice){grid-template-columns:1fr 1fr}.choice{min-height:48px}.sign-grid{gap:0 8px}.sign-tile img{width:66px;height:72px}.brand img{width:30px;height:30px}}
@media(prefers-reduced-motion:no-preference){button,a{transition:background-color .15s ease-out,border-color .15s ease-out}}
main:focus{outline:none}.previews img{height:auto}.audio-controls{display:flex;justify-content:center;align-items:center;gap:12px;margin:20px 0}.audio-controls .secondary{gap:8px}
.voice-sample{padding:20px 0;border-bottom:1px solid var(--line)}.voice-sample audio{display:block;width:100%;max-width:480px;margin:12px 0}.voice-sample>a{font-size:13px}
#account{display:flex;align-items:center;gap:10px;min-height:44px;text-decoration:none;max-width:280px}#account span:not(.avatar){overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#account svg{flex-shrink:0}.avatar{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:32px;height:32px;border-radius:50%;object-fit:cover;background:var(--soft);color:var(--green);font-size:16px;font-weight:600}.avatar.large{width:80px;height:80px;font-size:30px}.settings-panel{max-width:780px;padding:28px 32px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.account-identity{display:flex;gap:24px;align-items:center}.account-identity>div{min-width:0;flex:1}.account-email{font-weight:600;overflow-wrap:anywhere}.photo-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:16px}.photo-actions label{cursor:pointer}.photo-actions+.helper{margin-top:8px}.setting-row{border-top:1px solid var(--line);padding-top:24px;margin-top:24px}.setting-row>label{display:block;font-weight:600;margin-bottom:8px}.setting-row h2{font-size:18px;margin-bottom:16px}.setting-controls{display:grid;grid-template-columns:minmax(0,1fr) 120px;gap:12px;max-width:560px}.form-message{min-height:24px;font-size:14px;margin-top:6px;color:var(--muted)}.session-actions{display:flex;gap:12px;flex-wrap:wrap}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.photo-actions:has(input:focus-visible) label{outline:3px solid var(--orange);outline-offset:4px}.stats-list{margin:16px 0 0}.stats-list>div{display:flex;align-items:baseline;justify-content:space-between;gap:24px;padding:12px 0;border-bottom:1px solid var(--line)}.stats-list dt{color:var(--muted)}.stats-list dd{margin:0;text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}.progress-section .stats{margin:16px 0}.week-chart{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:10px;margin-top:24px}.week-chart>div{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:0;font-size:14px}.week-chart small{font-size:12px;color:var(--muted);white-space:nowrap}.week-chart meter{width:100%;height:12px}.week-chart meter::-webkit-meter-bar{background:var(--line);border:0}.week-chart meter::-webkit-meter-optimum-value{background:var(--green)}.week-chart meter::-moz-meter-bar{background:var(--green)}
@media(max-width:650px){#account{max-width:120px;gap:6px}#account>span:not(.avatar){display:none}.settings-panel{padding:24px 20px}.account-identity{align-items:flex-start;gap:16px}.avatar.large{width:56px;height:56px;font-size:24px}.photo-actions{gap:4px}.photo-actions label{padding-inline:12px}.setting-controls{grid-template-columns:minmax(0,1fr) 92px;gap:8px}.setting-controls button{padding-inline:10px}.progress-section{width:100%}.stats-list{font-size:14px}.stats-list>div{gap:12px}.week-chart{gap:6px}}