:root{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#183b3b;background:#f3f7f5;line-height:1.65;color-scheme:light}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:1000px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.brand{font-weight:750;color:#145d55;text-decoration:none}.badge{font-size:12px;background:#e0ebe6;padding:5px 12px;border-radius:20px}.intro{max-width:650px;padding:36px 0 20px}.eyebrow{letter-spacing:.15em;color:#427364;font-size:12px;font-weight:700}h1{font-size:clamp(30px,5vw,48px);line-height:1.3;letter-spacing:-.04em}h2{font-size:22px}h3{font-size:17px}p{color:#4f6763}.card{background:white;border:1px solid #d6e3dd;border-radius:20px;padding:clamp(20px,4vw,36px);max-width:720px;box-shadow:0 8px 32px #173e3510}label{display:block;margin:16px 0 6px;font-weight:600;font-size:14px}input,select,button{font:inherit;min-height:46px;border-radius:9px;width:100%}input,select{border:1px solid #8ba79e;background:#fff;padding:9px 12px;min-width:0;color:#183b3b}button{background:#146653;color:white;border:0;padding:10px 18px;margin-top:24px;font-weight:650;cursor:pointer}button:disabled{opacity:.6;cursor:wait}:focus-visible{outline:3px solid #da9c28;outline-offset:3px}.secondary{background:#e9f0ed;color:#164f43;width:auto;margin:0}.grid{display:grid;grid-template-columns:1fr;gap:0 24px}.row{display:flex;align-items:center;justify-content:space-between;gap:16px}.roadmap{margin-top:48px}.roadmap article{border-top:1px solid #cadbd2;padding:10px 0}#status{min-height:26px;color:#13523e}#status.error{color:#a12626}footer{font-size:13px;color:#5c7069;padding-top:32px;padding-bottom:48px}[hidden]{display:none!important}@media(min-width:600px){.grid{grid-template-columns:1fr 1fr}}
nav a{color:#145d55}.course-card{margin:20px 0}fieldset{border:1px solid #cadbd2;border-radius:10px;margin-top:16px}fieldset label{font-weight:400;display:flex;align-items:center;gap:8px}input[type=radio],input[type=checkbox]{width:22px;min-height:22px;flex-shrink:0}audio{max-width:100%}details{margin-top:24px}summary{cursor:pointer}#learning-content{overflow-wrap:anywhere}#learning-content h1{font-size:clamp(26px,4vw,38px)}
textarea{width:100%;min-height:90px;font:inherit;border:1px solid #8ba79e;border-radius:8px;padding:10px}pre{white-space:pre-wrap;overflow-wrap:anywhere}fieldset{min-width:0}#document-form fieldset{margin:12px 0;padding:12px}#document-form legend{font-size:13px;overflow-wrap:anywhere}#document-form button{width:auto;margin:4px;font-size:12px}header{gap:18px}#document-form input[type=checkbox]{width:22px}

#editor,#document-form label{overflow-wrap:anywhere}

/* Stage 3: mobile-first shared training shell. */
body{padding-bottom:88px}main{min-height:70vh}article{overflow-wrap:anywhere}a{color:#145d55}button{touch-action:manipulation}button:disabled{cursor:default}textarea{min-height:150px}nav a{display:inline-flex;align-items:center;min-height:44px;padding:8px}main>section>article,#study-history article,#sounds article,#resources article,#writing-detail article{background:white;border:1px solid #d6e3dd;border-radius:16px;padding:18px;margin:18px 0}.bottom-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));background:#fff;border-top:1px solid #cadbd2;padding:6px max(8px,env(safe-area-inset-right)) max(6px,env(safe-area-inset-bottom));box-shadow:0 -4px 18px #173e3510}.bottom-nav a{justify-content:center;border-radius:10px;min-height:48px;text-decoration:none;font-size:14px;font-weight:650}.bottom-nav a[aria-current=page]{background:#e0f0e8;color:#0a4f3a}.skill-grid,.dashboard-grid{display:grid;grid-template-columns:1fr;gap:16px}.skill-grid>a,.dashboard-grid>article{background:white;border:1px solid #d6e3dd;border-radius:18px;padding:20px;text-decoration:none}.skill-grid>a:active{background:#e0f0e8}.dashboard-grid h3{margin:0}.dashboard-grid p{margin-bottom:10px}#word-list,#material-list,#speech-list,#writing-list{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}#word-list>button,#material-list>button,#speech-list>button,#writing-list>button{width:auto;margin:0;padding:10px 14px;min-height:44px;font-size:15px}.word-token{display:inline;width:auto;min-height:44px;margin:0;padding:0 2px;background:transparent;border-radius:3px;color:inherit;font-weight:inherit;vertical-align:baseline}.word-token:hover,.word-token:focus{background:#dbede3}.current-sentence{outline:2px solid #27785f;background:#f0faf3!important}.subtitle-faded{opacity:.18;transition:opacity .8s}#speech-subtitle{font-size:24px;font-weight:600;min-height:80px}audio{display:block;width:100%;margin:12px 0}.error{color:#a12626}#material-detail>section,#speech-training>section{margin:20px 0;padding:16px;border:1px solid #d6e3dd;border-radius:14px}input[type=checkbox]{display:inline-block;width:auto}#txt-import label:has(input[type=checkbox]){display:flex;align-items:center;gap:10px}@media(min-width:700px){.skill-grid,.dashboard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.bottom-nav{left:50%;right:auto;width:min(100%,1000px);transform:translateX(-50%);border-radius:16px 16px 0 0}#word-card>button{width:auto;margin:8px;padding:12px 18px}}
.virtual-teacher{display:grid;justify-items:center;padding:26px;border-radius:18px;background:linear-gradient(135deg,#e0eee6,#fff8e7);margin:20px 0}.avatar-face{width:132px;height:142px;border-radius:48% 48% 44% 44%;background:#afd9c0;border:4px solid #367359;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.avatar-eyes{font-size:20px}.avatar-mouth{height:7px;width:28px;background:#284d3e;border-radius:50%}.virtual-teacher[data-state=speaking] .avatar-mouth{animation:lip-sync .18s infinite alternate}.virtual-teacher[data-state=thinking] .avatar-eyes{opacity:.5}.virtual-teacher[data-state=happy],.virtual-teacher[data-state=encouraging]{outline:3px solid #d9b945}.virtual-teacher[data-color=gold] .avatar-face{background:#f7d588}.virtual-teacher[data-color=blue] .avatar-face{background:#b9d9ee}.virtual-teacher[data-background=cafe]{background:#f0dcc5}.virtual-teacher[data-background=classroom]{background:#e4e9ff}@keyframes lip-sync{to{height:20px;width:23px}}@media(prefers-reduced-motion:reduce){.virtual-teacher .avatar-mouth{animation:none!important}}
video{display:block;width:100%;max-height:65vh;background:#112e26;border-radius:14px}#media-list,#chat-list{display:flex;flex-wrap:wrap;gap:8px}#media-list>button,#chat-list>button{width:auto}#video-cues article,#chat-messages article,#ai-jobs article{padding:16px;margin:12px 0;background:white;border:1px solid #cadbd2;border-radius:12px}#video-work>select{margin:10px 0}.virtual-teacher::after{content:'近似口型动画，非音素同步';font-size:12px;color:#536b60}
.plan-actions { display:flex; flex-wrap:wrap; gap:.5rem; margin:.75rem 0; }
.plan-actions button { width:auto; flex:1 1 7rem; }
.plan-task { border-top:1px solid #d3ded8; padding:1rem 0; overflow-wrap:anywhere; }
.study-calendar { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:.6rem; }
.calendar-day { padding:.7rem; border:1px solid #d3ded8; border-radius:.7rem; overflow-wrap:anywhere; }
.calendar-day p { font-size:.85rem; }
.active-day { background:#e4f2e7; }
#plan-history { display:flex; flex-wrap:wrap; gap:.5rem; }
#plan-history button { width:auto; }
#xp-ledger { overflow-wrap:anywhere; }