:root{color-scheme:light;--ink:#203047;--muted:#5d697a;--line:#dbe2ea;--purple:#5145a5;--light:#eeeafa;--green:#25755a;--bg:#f5f6fa}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 system-ui,-apple-system,Segoe UI,sans-serif}header{background:white;border-bottom:1px solid var(--line);padding:18px max(24px,calc((100vw - 1100px)/2));display:flex;justify-content:space-between;align-items:center;gap:18px}.brand{text-decoration:none;color:var(--ink);font-size:21px;font-weight:750;display:flex;gap:12px;align-items:center}.brand-icon{background:var(--purple);color:white;width:38px;height:38px;border-radius:12px;text-align:center;line-height:38px}nav{display:flex;gap:6px}nav a{text-decoration:none;color:var(--muted);padding:9px 18px;border-radius:10px;font-weight:650}nav a[aria-current]{background:var(--light);color:var(--purple)}.preview-note{font-size:13px;padding:10px 20px;text-align:center;color:var(--muted)}.preview-note span{padding:0 8px}main{max-width:1100px;margin:35px auto 70px;padding:0 24px;outline:none}.pupil-layout{display:grid;grid-template-columns:230px minmax(0,680px);gap:42px;justify-content:center}.rail{padding-top:16px}.eyebrow{font-size:12px;font-weight:750;text-transform:uppercase;letter-spacing:.11em;color:var(--purple);margin:0 0 10px}.rail h2{font-size:24px;line-height:1.3;margin:0 0 28px}.steps{list-style:none;margin:0;padding:0}.steps li{display:flex;gap:12px;align-items:center;margin:18px 0;color:var(--muted);font-size:15px}.steps li span{display:grid;place-items:center;border:1px solid var(--line);background:white;border-radius:50%;width:30px;height:30px}.steps li.current{color:var(--purple);font-weight:750}.steps li.current span{background:var(--purple);color:white;border-color:var(--purple)}.rail .small{margin-top:30px}.card{background:white;border:1px solid var(--line);border-radius:24px;padding:42px;box-shadow:0 10px 32px #20304706}h1{font-size:clamp(28px,4vw,38px);line-height:1.2;margin:8px 0 18px;letter-spacing:-.03em}h2{font-size:23px;line-height:1.3}h3{font-size:17px}.lede{font-size:19px;color:var(--muted)}p{margin:0 0 20px}.small{font-size:14px;color:var(--muted)}.pill{font-size:13px;font-weight:650;border-radius:25px;padding:6px 12px;display:inline-block;background:var(--light);color:var(--purple);margin-bottom:16px}.icon{font-size:48px;width:88px;height:88px;background:#f2effb;border-radius:24px;display:grid;place-items:center;margin-bottom:26px}.scene{font-size:72px;background:#f5f6fa;border-radius:20px;display:grid;place-items:center;width:116px;height:116px;margin:20px auto}.check-list{padding:0;list-style:none;margin:28px 0}.check-list li{margin:14px 0;padding-left:30px;position:relative}.check-list li:before{content:'✓';position:absolute;left:0;color:var(--green);font-weight:800}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}button,.button{font:inherit;font-size:16px;font-weight:650;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:49px;border:1px solid transparent;background:var(--purple);color:white;padding:12px 21px;border-radius:12px;text-decoration:none}button.secondary,.button.secondary{background:white;border-color:var(--line);color:var(--ink)}button.quiet{background:transparent;color:var(--muted);font-weight:500;padding:8px 0;min-height:44px}button:disabled{opacity:.55;cursor:wait}button:hover:not(:disabled){filter:brightness(.94)}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #f3b54d;outline-offset:4px}label{display:block;font-size:15px;font-weight:650;margin:24px 0 8px}input[type=text]{width:100%;border:2px solid #cbd2df;border-radius:12px;font:inherit;font-size:25px;padding:13px 16px;color:var(--ink);background:white}.question-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:25px}.question-top .small{margin:0}.question-top button{font-size:14px}.audio-button{width:100%;background:var(--light);color:var(--purple);font-size:18px;padding:20px}.status{min-height:26px;font-size:14px;color:var(--muted);margin:10px 0}.divider{border:0;border-top:1px solid var(--line);margin:26px 0}.callout{padding:18px 20px;border-radius:12px;background:#f3f6fb;border-left:3px solid #b8c9df;font-size:15px;margin:22px 0}.success{background:#eaf5f0;border-color:#b6d8c9;color:#1c6148}.teacher-head{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;margin-bottom:28px}.teacher-head p{margin-bottom:0}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:22px 0}.metric{background:white;border:1px solid var(--line);border-radius:16px;padding:22px}.metric strong{font-size:32px;display:block}.metric span{font-size:14px;color:var(--muted)}.teacher-card{background:white;border:1px solid var(--line);border-radius:18px;padding:28px;margin:20px 0}.teacher-card h2{margin:0 0 16px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px}th,td{text-align:left;padding:13px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:12px;letter-spacing:.03em;text-transform:uppercase;color:var(--muted)}.tag{display:inline-block;font-size:12px;padding:4px 9px;border-radius:8px;background:#edf1f7;color:#46576e;white-space:nowrap}.tag.good{background:#eaf5f0;color:#1c6148}.tag.attention{background:#fff4de;color:#725615}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}details summary{cursor:pointer;font-weight:650}details p,details ul{margin-top:14px}.empty{padding:35px;text-align:center;color:var(--muted)}footer{max-width:1100px;margin:30px auto;padding:25px 24px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:20px}#notice{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);max-width:min(640px,90vw);background:#203047;color:white;padding:18px 22px;border-radius:14px;z-index:10}#notice button{min-height:32px;margin-left:12px;background:#ffffff20;font-size:14px;padding:5px 10px}#notice[hidden]{display:none}@media(max-width:760px){main{margin-top:20px}.pupil-layout{display:block}.rail{padding:0}.rail h2,.rail .small{display:none}.steps{display:flex;justify-content:space-between;gap:8px;margin-bottom:22px}.steps li{font-size:12px;gap:7px;margin:0}.steps li span{width:25px;height:25px;flex-shrink:0}.card{padding:27px 23px;border-radius:20px}.grid{gap:10px}.metric{padding:16px 12px}.metric strong{font-size:26px}.two-col{display:block}.teacher-head{display:block}.teacher-head .actions{margin-top:16px}header{padding:14px 18px}.brand{font-size:18px}nav a{padding:8px 11px;font-size:14px}.brand-icon{width:32px;height:32px;line-height:32px}.preview-note{font-size:11px}.preview-note span{padding:0 3px}footer{display:block}.question-top{margin-bottom:16px}.teacher-card{padding:22px 18px}.actions>button.primary{flex:1}.lede{font-size:17px}}
.stage-preview{display:grid;gap:10px;margin:18px 0}.stage-preview>div{display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fafbfe}.stage-preview span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--light);color:var(--purple);font-weight:750}.stage-preview strong{font-size:15px}.stage-preview small{font-size:13px;color:var(--muted)}@media(max-width:520px){.stage-preview>div{grid-template-columns:34px 1fr}.stage-preview small{grid-column:2}.steps li{display:grid;justify-items:center;text-align:center;gap:4px}.steps li span{grid-row:1}}
.word-change{display:flex;align-items:center;justify-content:center;gap:18px;padding:22px;margin:20px 0;background:#f5f2ff;border-radius:18px;font-size:clamp(24px,6vw,38px)}.word-change span{text-decoration:line-through;text-decoration-color:#d86b6b}.word-change strong{color:var(--purple)}.focus-word{text-align:center;font-size:38px;font-weight:800;padding:18px;background:#f5f2ff;border-radius:16px;margin:18px 0}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.choice{background:white;color:var(--ink);border:2px solid var(--line);min-height:62px}.choice:hover{border-color:var(--purple);background:var(--light)}.callout.attention{background:#fff4de;border-color:#e7be65;color:#60480d}.rule-strip{font-weight:700;padding:14px 16px;border-radius:12px;background:#fff6d9;border:1px solid #eedb9b}.score-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 0}.score-grid div{padding:18px;background:#f5f6fa;border-radius:14px}.score-grid strong{display:block;font-size:28px}.score-grid span{font-size:13px;color:var(--muted)}@media(max-width:760px){.learning-steps{display:grid;grid-template-columns:repeat(3,1fr);row-gap:12px}.choice-grid{grid-template-columns:1fr}.word-change{gap:10px}.score-grid{grid-template-columns:1fr}}

@media(max-width:760px){.learning-steps{display:block;margin-bottom:14px}.learning-steps li:not(.current){display:none}.learning-steps li.current{display:flex;justify-content:flex-start;text-align:left}.rail{padding-top:0}}
.rule-help{margin:22px 0;padding:15px 17px;border:1px solid var(--line);border-radius:14px;background:#fafbfe}.rule-help summary{color:var(--purple)}.vowels{display:flex;gap:9px;margin-top:14px}.vowels b{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--light);color:var(--purple);font-size:21px}.sound-toggle{min-height:40px;padding:7px 11px;font-size:13px}.home-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:25px}.next-card{padding:28px;border-radius:22px;background:linear-gradient(135deg,#eeeafa,#f7f5ff);border:1px solid #d9d2f2;margin:20px 0 28px}.next-card.attention{background:#fff7e7;border-color:#ead293}.next-card h2{font-size:28px;margin:4px 0 10px}.home-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.rule-list{display:grid;gap:13px}.rule-card{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:20px 22px;background:white;border:1px solid var(--line);border-radius:17px}.rule-card.recommended{border-color:#e1bc65;background:#fffbf1}.rule-card h3{margin:9px 0 5px}.rule-card p{margin:0}.game-card{max-width:680px;margin:auto}@media(max-width:760px){.home-head,.rule-card{display:block}.home-head .sound-toggle,.rule-card button{margin-top:12px;width:100%}.home-grid{grid-template-columns:1fr}.game-card{padding:27px 23px}.question-top .sound-toggle{font-size:0}.question-top .sound-toggle:before{content:'🔊';font-size:18px}}
.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.privacy{border-left-color:#5145a5;background:#f1effa}.pattern-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.pattern-grid article{padding:18px;border:1px solid var(--line);border-radius:14px;background:#fafbfe}.pattern-grid article>strong{font-size:24px;color:var(--purple)}.pattern-grid h3{margin:3px 0 7px}.pattern-grid p{font-size:14px;color:var(--muted);margin:0}.teacher-workspace{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(310px,1fr);gap:20px;align-items:start}.teacher-roster,.teacher-detail{background:white;border:1px solid var(--line);border-radius:18px;padding:24px}.teacher-detail{position:sticky;top:18px}.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.filter-bar button{min-height:40px;padding:7px 13px}.filter-bar button.active{background:var(--purple)}.detail-list{margin:0 0 20px}.detail-list div{padding:11px 0;border-bottom:1px solid var(--line)}.detail-list dt{font-size:12px;color:var(--muted);text-transform:uppercase;font-weight:700}.detail-list dd{margin:3px 0 0}.teacher-roster tbody tr:has(button:focus){background:#faf8ff}@media(max-width:900px){.grid.four{grid-template-columns:repeat(2,1fr)}.pattern-grid{grid-template-columns:1fr}.teacher-workspace{grid-template-columns:1fr}.teacher-detail{position:static}}@media(max-width:520px){.grid.four{grid-template-columns:1fr 1fr}.teacher-roster,.teacher-detail{padding:18px 14px}.filter-bar button{flex:1}.teacher-workspace table th:nth-child(3),.teacher-workspace table td:nth-child(3),.teacher-workspace table th:nth-child(4),.teacher-workspace table td:nth-child(4){display:none}}
.context-card{margin:18px 0;padding:18px;border-radius:18px;background:#f3f0fc;border:1px solid #ded7f2}.context-card .scene{font-size:62px;text-align:center;margin:8px 0 20px}.gap-sentence{font-size:clamp(21px,4vw,28px);line-height:1.6;text-align:center;font-weight:600;overflow-wrap:anywhere}.word-change span{text-decoration:none}
.context-card .scene{display:flex;width:100%;height:auto;min-height:110px;align-items:center;justify-content:center;white-space:nowrap;line-height:1.4;background:transparent;border:0}
.daily-layout{max-width:680px;margin:0 auto}