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var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s,border-color .18s}.context-card:hover{transform:translateY(-4px);border-color:var(--accent)}.context-art{height:145px;background:var(--tint);position:relative;padding:10px;overflow:hidden}.context-art svg{width:100%;height:100%;display:block}.context-body{padding:23px}.context-body .eyebrow{margin:0 0 8px;font-size:10px;color:var(--accent)}.context-body h3{font-size:23px;margin-bottom:10px}.context-body p{font-size:13px;margin-bottom:19px;color:var(--muted)}.card-bottom{display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:700}.arrow{font-size:22px}.progress-strip{margin-top:30px;padding:21px 25px;border-radius:18px;background:#ecefe5;display:flex;gap:25px;align-items:center;justify-content:space-between}.progress-strip strong{font-size:22px}.progress-strip p{margin:0;font-size:13px}.meter{height:7px;background:#d5ded1;border-radius:10px;overflow:hidden;margin-top:10px;min-width:170px}.meter i{display:block;height:100%;background:var(--green)}.notice{padding:13px 17px;border:1px solid #e5cda9;background:#fff5df;border-radius:12px;font-size:13px;margin:0 0 24px;line-height:1.7}.page-title{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin:14px 0 22px}.page-title h1{font-size:34px;margin:10px 0 12px}.page-title p{font-size:14px;color:var(--muted);margin:0}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.toolbar label{font-size:13px}.toolbar select,.toolbar input{padding:10px 12px;border:1px solid var(--line);background:var(--paper);border-radius:10px;min-height:44px;color:var(--ink)}.stage-groups{margin-top:24px}.group-head{display:flex;gap:14px;align-items:center;margin:28px 0 14px}.group-head span{font-size:12px;color:var(--orange);letter-spacing:1px}.group-head 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small{display:block;margin-top:8px}.hint-panel{padding:16px;background:#f3eee2;border-radius:12px;font-size:13px;line-height:1.9;margin:15px 0}.help-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}.help-actions button{font-size:12px;padding:8px 12px;background:transparent;border:1px solid var(--line);color:var(--muted)}details{margin-top:17px;border-top:1px solid var(--line);padding-top:14px}summary{cursor:pointer;font-size:13px;min-height:34px;line-height:1.8;color:var(--green)}.learn-controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:22px;color:var(--muted);font-size:12px}.learn-controls select{border:1px solid var(--line);border-radius:8px;padding:6px;background:var(--paper);font-size:12px;min-height:38px}.learn-controls label{display:inline-flex;align-items:center;gap:6px}.score-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0}.score-grid div{background:var(--soft);padding:18px;border-radius:14px}.score-grid strong{font-size:26px;display:block}.score-grid small{font-size:11px;line-height:1.8}.outcome{display:flex;gap:12px;align-items:flex-start;padding:12px 0;font-size:16px;border-bottom:1px solid var(--line)}.outcome p{margin:0;line-height:1.6}.outcome small{display:block;font-size:12px;margin-top:5px}.outcome .tick{color:var(--green)}.switch-next{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:15px}.switch-next a{border:1px solid var(--line);border-radius:12px;padding:13px;font-size:13px;background:#eef1e7;text-align:center;line-height:1.7}.grammar-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.grammar-card{padding:24px;background:var(--paper);border:1px solid var(--line);border-radius:18px}.grammar-card h2{font-size:18px}.grammar-card p{font-size:13px}.grammar-card .ref-en{font-size:18px;color:var(--green)}.grammar-card a{font-size:12px;display:inline-flex;min-height:44px;align-items:center;color:var(--orange)}.guide-panel{max-width:850px;background:var(--paper);border:1px solid var(--line);padding:30px;border-radius:var(--radius)}.guide-panel h2{font-size:21px;margin-top:30px}.guide-panel p,.guide-panel li{font-size:14px;line-height:1.9}.ref-table{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}.ref-table span{padding:9px;background:var(--soft);border-radius:8px;font-size:13px}.review-list{display:grid;gap:12px}.review-item{padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:14px;display:flex;justify-content:space-between;gap:15px;align-items:center}.review-item p{margin:5px 0 0;font-size:13px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:25px 30px;max-width:1280px;margin:auto;color:var(--muted);font-size:12px;display:flex;justify-content:space-between;gap:15px;line-height:1.8}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);max-width:calc(100% - 30px);padding:13px 20px;border-radius:13px;background:var(--green);color:#fff;font-size:13px;z-index:20;box-shadow:var(--shadow)}#toast:empty{display:none}.print-only{display:none}
@media(max-width:1000px){.header-note{display:none}.stage-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.lesson-layout{grid-template-columns:220px minmax(0,1fr)}.lesson-rail{padding:20px}.site-header{padding:20px 28px}nav{gap:18px}.hero{gap:25px}.context-body{padding:18px}.lesson-panel{padding:25px}}
@media(max-width:800px){main{padding:25px 22px 45px}.site-header{flex-wrap:wrap;gap:15px;padding:18px 22px}.site-header nav{margin-left:auto}.hero h1{font-size:38px}.hero-art{min-height:260px;padding:19px}.hero-art .bubble{font-size:16px}.hero p{font-size:14px}.stage-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-layout{grid-template-columns:1fr}.lesson-rail{position:static;padding:19px 22px}.lesson-rail h1{font-size:22px;margin:8px 0}.lesson-rail p{margin-bottom:8px}.step-nav{flex-direction:row;overflow-x:auto;margin-top:15px;gap:4px;padding-bottom:3px}.step-nav button{flex-shrink:0;white-space:nowrap;padding:8px}.lesson-panel{padding:24px}.context-art{height:115px}.context-body h3{font-size:21px}.context-body p{font-size:12px}.page-title{flex-direction:column}.score-grid{gap:8px}.learning-heading{flex-wrap:wrap}}
@media(max-width:540px){.site-header{padding:17px 18px;gap:14px}.brand{font-size:16px}.brand-icon{width:38px;height:38px}.site-header nav{width:100%;justify-content:space-between;gap:10px;font-size:12px;margin:0}.site-header nav a{min-height:38px}main{padding:22px 16px 40px}.hero{grid-template-columns:1fr;margin:5px 0 25px;gap:24px}.hero h1{font-size:36px;letter-spacing:-.8px;margin-bottom:18px}.hero-art{min-height:232px;border-radius:25px}.hero-art .bubble{font-size:17px}.hero-bottom{margin-top:17px}.context-grid{grid-template-columns:1fr;gap:12px}.context-card{display:grid;grid-template-columns:110px minmax(0,1fr)}.context-art{height:100%;padding:6px;min-height:156px}.context-body{padding:17px}.context-body h3{font-size:20px;margin-bottom:7px}.context-body p{margin-bottom:10px}.context-body .eyebrow{font-size:9px}.section-heading{align-items:flex-start;gap:10px;flex-direction:column;margin-top:27px}.section-heading h2{font-size:22px}.progress-strip{padding:18px;gap:12px;flex-wrap:wrap}.progress-strip>div{flex:1;min-width:150px}.meter{min-width:0}.stage-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.stage-card{min-height:149px;padding:15px}.stage-card h3{font-size:13px}.page-title h1{font-size:29px}.page-title{margin-top:0;gap:15px}.toolbar{gap:8px}.toolbar select,.toolbar input{max-width:100%;font-size:13px}.toolbar input{width:80px}.learning-heading{gap:12px}.learning-heading .toolbar{width:100%;justify-content:flex-start}.lesson-panel{padding:22px 17px;border-radius:18px}.lesson-rail{padding:18px;border-radius:18px}.lesson-panel h2{font-size:22px}.sentence{font-size:19px;gap:7px}.sentence button{min-width:44px;padding:7px}.question-top{gap:8px}.info-card{padding:13px;font-size:14px}.dialogue-bubble{padding:16px;font-size:14px}.choice{padding:12px;font-size:16px}.buttons>button{flex:1;min-width:130px}.score-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.score-grid div{padding:13px 9px}.score-grid strong{font-size:24px}.score-grid small{font-size:10px}.switch-next{gap:7px}.switch-next a{padding:12px 7px;font-size:12px}.grammar-grid{grid-template-columns:1fr}.grammar-card{padding:20px}.guide-panel{padding:22px 18px}.ref-table{grid-template-columns:repeat(4,1fr)}.review-item{align-items:flex-start}.review-item .button{flex-shrink:0;font-size:12px;padding:10px}.learn-controls{gap:8px;line-height:1.7}.chunk{padding:8px 10px}.chunk .en{font-size:15px}.group-head{gap:8px}.group-head h2{font-size:16px}footer{flex-direction:column;padding:22px 18px;font-size:11px}.word-bank button,.order-answer button{padding:9px 12px}.input-line{font-size:18px}.outcome{font-size:15px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
.lesson-rail,.lesson-layout,.lesson-panel,.step-nav{min-width:0;max-width:100%}
.partner-en{display:flex;align-items:flex-start;gap:10px;justify-content:space-between}.partner-en span{min-width:0;overflow-wrap:anywhere}.partner-en button{min-width:44px;min-height:44px;padding:8px;flex-shrink:0}.partner-en+#repeat-read{font-size:12px}
@media(max-width:540px){.dialogue-bubble,.info-card{font-size:16px}.callout{font-size:14px}.step-nav button,.label-switch button{min-height:44px}.translation{font-size:14px}}
@media print{.site-header,footer,.toolbar,.buttons,.learn-controls,.lesson-rail,.help-actions,#toast,button{display:none!important}main{max-width:none;padding:0}.lesson-layout{display:block}.lesson-panel,.grammar-card{box-shadow:none;border:0}.grammar-grid{display:block}.grammar-card{break-inside:avoid}.print-only{display:block}body{background:white}}
/* v3: small, purposeful explanations and a recoverable task thread. */
.confirmed-facts{padding:12px 16px;margin:0 0 18px;border-radius:12px;background:#e4efdf;color:#31583c;font-size:15px;line-height:1.8;overflow-wrap:anywhere}
.task-overview,.contrast-card{background:#edf1e7;border:1px solid #d4dfce;border-radius:16px;padding:18px;margin:18px 0;line-height:1.8}
.task-overview small,.conversation-history small{display:block;color:var(--muted);line-height:1.7}
.example-purpose{font-size:14px;color:var(--muted);margin-bottom:12px}
.example details{margin-top:16px;line-height:1.85}
.conversation-history,.task-reference{background:#faf6ed;border:1px solid #e1dacb;border-radius:12px;padding:13px 16px;margin:16px 0;overflow-wrap:anywhere}
.conversation-history summary,.task-reference summary{cursor:pointer;min-height:30px;font-weight:600}
.conversation-history ol{padding-left:23px;margin-bottom:0}.conversation-history li{padding:14px 0;border-bottom:1px solid #e4ddcf}
.conversation-history li:last-child{border:0}.conversation-history li p{margin:8px 0}
.optional-panel{margin-top:22px;background:#f5efe2;border-radius:16px;padding:18px}.optional-panel article{margin:18px 0}
.optional-panel .choices{display:grid;gap:10px}.optional-panel button{white-space:normal;text-align:left;line-height:1.6;width:100%}
.choice span,.hint-panel,.feedback{overflow-wrap:anywhere}.info-card{white-space:pre-line;line-height:1.8}
@media(max-width:600px){.task-overview,.contrast-card{padding:14px}.conversation-history,.task-reference{padding:12px}.example details{font-size:16px}.optional-panel{padding:14px}}
/* Practical sample lessons: task outcomes, vocabulary and optional speaking. */
.practical-outcomes{background:#e8f1e8;border-left:4px solid #477a6b;padding:18px 20px;margin:20px 0;border-radius:8px}
.practical-outcomes ul{padding-left:22px;margin-bottom:0;line-height:1.9}
.reference-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.phrase-card{display:flex;gap:10px;align-items:center;justify-content:space-between;border:1px solid #deded2;border-radius:10px;padding:12px 14px;margin:6px 0;background:#fffdf7;overflow-wrap:anywhere}
.phrase-card small{display:block;color:#647065;margin-top:5px}.phrase-card button{flex-shrink:0}
.fitness-reference,.oral-practice{padding:16px;background:#f4f6ee;border:1px solid #d4decf;border-radius:12px;margin:14px 0 24px}
.fitness-reference summary,.oral-practice summary{font-weight:700;cursor:pointer}
.whole-chunk{padding:14px;border-radius:10px;background:#f4efe3;margin:15px 0}.whole-chunk p{margin:8px 0 0}
.equipment-figure{margin:16px 0;display:flex;align-items:center;gap:16px}.equipment-figure svg{width:45%;min-width:130px}.equipment-figure figcaption{line-height:1.7}
.scene-cue{background:#f0e9d7;padding:12px;border-radius:8px;font-size:14px}
@media(max-width:600px){.reference-grid{grid-template-columns:1fr}.equipment-figure{display:block}.equipment-figure svg{width:100%;max-width:300px}.phrase-card{padding:10px}}