:root{--ink:#233c3c;--teal:#226858;--paper:#f6f4ed;--muted:#6c7c75;--line:#dedfd4;--yellow:#f6d479;--coral:#d87752}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Segoe UI","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.6}button,input,textarea,select{font:inherit}button,.file-button{border:1px solid var(--line);border-radius:10px;background:#fffdf7;color:var(--ink);padding:9px 15px;cursor:pointer}button:hover,.file-button:hover{background:#eceee2;border-color:var(--teal)}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}button:disabled{opacity:.4;cursor:default}.primary{background:var(--teal);color:white;border-color:var(--teal)}.primary:hover{background:#164d42}.large{margin-top:24px;padding:14px 28px}header{display:flex;justify-content:space-between;align-items:center;padding:18px 4%;border-bottom:1px solid var(--line);gap:20px}.brand{text-decoration:none;font-size:25px;font-weight:900;color:var(--teal);letter-spacing:2px}.brand small{display:block;font-size:10px;letter-spacing:3px}.header-actions,.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.course-heading{margin:28px auto 20px;max-width:1280px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;gap:15px}.eyebrow{font-size:12px;color:var(--teal);font-weight:800;letter-spacing:2px;margin:0 0 9px}h1{font-size:34px;margin:0;line-height:1.25}h1 span{display:inline-block;font-size:18px;color:var(--muted);margin-left:15px;font-weight:500}.clock{display:flex;align-items:center;gap:12px}.clock>span{font-size:26px;font-variant-numeric:tabular-nums}.clock button{font-size:13px}nav{max-width:1280px;margin:0 auto 24px;padding:0 28px;display:grid;grid-template-columns:repeat(7,1fr);gap:8px}nav button{text-align:left;padding:12px 14px;border-radius:12px}nav small,nav strong,nav span{display:block}nav 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18px;padding:30px;transform:rotate(1deg)}.welcome-art img{width:100%;max-height:280px;object-fit:contain;mix-blend-mode:multiply}.sticker{position:absolute;right:8px;bottom:-12px;background:var(--yellow);padding:17px;border-radius:50%;font-size:11px;text-align:center;transform:rotate(-8deg)}.sticker strong{font-size:19px}.activity-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}.activity-cards article{padding:22px;border:1px solid var(--line);border-radius:14px;background:#f9f8f1}.activity-cards:has(article:nth-child(2):last-child){grid-template-columns:1fr 1fr}.section-intro{margin-bottom:25px}.word-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.word-card{border:1px solid var(--line);border-radius:14px;padding:20px;background:#fbfaf3}.word-card>img{width:100%;height:115px;object-fit:contain;mix-blend-mode:multiply;margin-bottom:12px}.word-row{display:flex;justify-content:space-between;align-items:center;gap:10px}.word-row h3{font-size:27px;margin:0}.word-row button{font-size:12px;padding:6px 10px;white-space:nowrap}.phonetic{font-size:14px;color:var(--muted);margin:3px 0}.example{padding:10px 0;border-top:1px solid var(--line);font-size:17px}.voice-button{font-size:12px;padding:5px 9px}.more-words{margin-top:22px}.more-words .word-grid{margin-top:18px}summary{cursor:pointer;color:var(--teal);font-size:14px;font-weight:600}details>p{font-size:16px}.video-layout,.practice-layout{display:grid;grid-template-columns:1.3fr 1fr;gap:30px}video{width:100%;max-height:430px;background:#172f2d;border-radius:14px}.question-box{background:#f1f1e4;border-radius:12px;padding:16px 20px;margin:15px 0}.question-box>p{font-size:21px;font-weight:700;margin:0 0 10px}.people-mini{display:flex;gap:12px}.people-mini>div{flex:1;text-align:center;min-width:0}.people-mini img{width:100%;height:110px;object-fit:contain}.people-mini 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.student-line .speech-text,.hide-student .student-line .voice-button{visibility:hidden}.hide-student .student-line>div{background:repeating-linear-gradient(0deg,transparent,transparent 30px,#cad9c7 31px,transparent 32px)}.pattern-strip{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:20px 0}.pattern-strip>div{background:#eaf1e6;border-radius:12px;padding:18px}.pattern-strip strong,.pattern-strip span{display:block}.pattern-strip strong{font-size:23px}.choices{display:grid;gap:12px}.choices button{text-align:left;font-size:19px}.success{color:#206744;font-weight:700}.retry{color:#b06036;font-weight:700}.sentence{font-size:22px;color:var(--teal);line-height:1.8}.homework{margin:25px 0;background:#f5e8c6;border-radius:15px;padding:20px 26px}.homework li{margin:8px 0}#teacher-panel{margin-top:26px;border-left:4px solid var(--coral);padding:15px 22px;background:#faf0e6;font-size:14px}#teacher-panel strong{color:#a15131}.teacher-record{margin-top:20px}.record-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}label{display:block;font-size:14px;color:var(--muted);margin:10px 0}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:8px;padding:10px;background:white;color:var(--ink)}textarea{resize:vertical}footer{max-width:1224px;margin:22px auto;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:0 5px}#pace{font-size:14px;color:var(--muted)}.audio-bar{display:flex;justify-content:center;gap:18px;align-items:center;padding:12px;background:#e9ebdf;font-size:12px}.audio-bar button{font-size:12px;padding:5px 10px}dialog{border:1px solid var(--line);border-radius:20px;padding:28px;width:min(1100px,94vw);max-height:90vh;overflow:auto;color:var(--ink);background:#fffdf8}dialog::backdrop{background:#153c36a8;backdrop-filter:blur(3px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.dialog-head h2{margin:3px 0}.notebook-layout{display:grid;grid-template-columns:310px 1fr;gap:30px;margin:20px 0}.notebook-toolbar{display:flex;gap:10px;margin-bottom:12px}.notebook-toolbar input{flex:1;min-width:0}.notebook-toolbar select{width:130px}.notebook-item{border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:12px;overflow-wrap:anywhere}.notebook-item .word-row strong{font-size:23px}.notebook-item select{width:115px;font-size:13px;padding:5px}.notebook-item p{margin:8px 0;font-size:15px}.notebook-item button{font-size:12px;padding:6px 10px}.notebook-item .example{font-size:16px}.empty{padding:30px;background:#f3f2e9;border-radius:12px;color:var(--muted)}.review-box{background:#edf2e5;border-radius:12px;padding:20px;margin:20px 0}.review-box h3{margin-right:auto}#review-card{margin-top:12px}#review-card>strong{font-size:27px}.review-answer{font-size:18px;margin-top:12px}.file-button{display:inline-block;position:relative;margin:0;font-size:16px;color:var(--ink)}.file-button input{position:absolute;inset:0;opacity:0;cursor:pointer}#page-image{width:100%;margin-top:15px}#toast{position:fixed;bottom:35px;left:50%;transform:translateX(-50%);background:var(--teal);color:white;border-radius:10px;padding:12px 24px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:5}#toast.visible{opacity:1}#selection-add{position:fixed;right:24px;bottom:30px;z-index:6;background:var(--yellow);box-shadow:0 5px 20px #0002}[hidden]{display:none!important}
@media(max-width:900px){nav{grid-template-columns:repeat(4,1fr)}.welcome h2{font-size:42px}.word-grid{grid-template-columns:repeat(2,1fr)}.story-layout{grid-template-columns:.85fr 1.2fr;gap:20px}.scene-art{height:220px}.notebook-layout{grid-template-columns:260px 1fr;gap:20px}.activity-cards{grid-template-columns:1fr 1fr}.record-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){header{padding:14px 18px;align-items:flex-start;gap:12px}.brand{font-size:21px}.brand small{font-size:8px}.header-actions{justify-content:flex-end;gap:5px}.header-actions button{font-size:11px;padding:7px 8px}.course-heading{margin:20px 0 16px;padding:0 18px;align-items:flex-start}h1{font-size:28px}h1 span{display:block;margin:8px 0;font-size:16px}.eyebrow{font-size:9px;letter-spacing:1px}.clock{flex-direction:column;gap:3px}.clock>span{font-size:21px}.clock button{font-size:10px;padding:5px 7px}nav{grid-template-columns:repeat(4,1fr);padding:0 14px;gap:5px}nav button{padding:8px 5px}nav strong{font-size:12px}nav small{font-size:8px}nav span{font-size:9px}main{margin:0 12px;padding:20px 16px;min-height:400px}.welcome,.story-layout,.video-layout,.practice-layout{grid-template-columns:1fr;gap:20px}.welcome h2{font-size:39px}.welcome-art{margin:0 22px;padding:20px}.welcome-art img{max-height:180px}.activity-cards,.activity-cards:has(article:nth-child(2):last-child),.word-grid,.pattern-strip,.notebook-layout{grid-template-columns:1fr}.activity-cards article{padding:18px}.word-card{padding:17px}.word-card>img{height:130px}.scene-art{height:230px}.script-line p{font-size:18px}.speaker{min-width:55px}.scene-tabs button{font-size:11px;padding:7px 9px}.question-box>p{font-size:18px}h2{font-size:26px}footer{padding:0 12px}footer button{font-size:12px;padding:8px}#pace{font-size:10px;text-align:center}.audio-bar{font-size:10px;gap:8px;padding:10px 14px}.audio-bar span{flex:1}dialog{padding:20px 15px}.notebook-toolbar{flex-direction:column}.notebook-toolbar select{width:100%}.dialog-head h2{font-size:24px}.dialog-head button{font-size:12px;padding:7px}.notebook-layout{gap:12px}.button-row{gap:8px}.record-grid{grid-template-columns:1fr 1fr}#toast{width:85%;text-align:center;font-size:13px}.notebook-item .word-row strong{font-size:20px}.choices button{font-size:17px}}