*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.55 Inter,system-ui,-apple-system,"Segoe UI",sans-serif;color:#1b2b50;background:#f3f5fb}button,input,select,textarea{font:inherit}button{cursor:pointer;border-radius:12px;padding:11px 16px;border:1px solid #cdd6eb;background:#e9edf8;color:#233862;font-weight:650}button:hover{filter:brightness(.96)}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #6b64c9;outline-offset:3px}button:disabled{opacity:.45;cursor:not-allowed}.primary{background:#4d3fa7;color:#fff;border-color:#4d3fa7}.secondary{background:#e9edf8;color:#263967}.top{height:70px;background:#111d42;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 max(22px,calc((100vw - 1400px)/2));gap:20px}.top a{color:#d6dffa;text-decoration:none;font-size:14px}.top strong{font-size:24px}.top strong span{color:#7ce5d7}.shell{max-width:1440px;margin:auto;padding:24px 24px 55px}.hero{background:linear-gradient(115deg,#111b40,#362b79 70%,#246079);border-radius:26px;color:#fff;padding:36px 42px;margin-bottom:26px}.hero h1{font-size:clamp(28px,4vw,43px);letter-spacing:-.04em;line-height:1.15;margin:10px 0}.hero p{color:#e2e7fb}.eyebrow{color:#6b54bd;font-weight:800;font-size:12px;letter-spacing:.16em}.hero .eyebrow{color:#a9e9e4}.hero-stats{display:flex;gap:10px;flex-wrap:wrap}.hero-stats span{padding:7px 14px;border-radius:30px;background:#ffffff22;color:#fff;font-size:13px}.layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:24px;align-items:start}.sidebar,.library,.lesson{border:1px solid #d8e0f1;background:#fff;border-radius:24px;box-shadow:0 10px 30px #1729510b}.sidebar{padding:26px;position:sticky;top:16px}.sidebar h2,.library h2{margin:0 0 14px;color:#142447}.sidebar label:not(.check){display:block;margin:18px 0 6px;font-weight:650;font-size:14px}.sidebar input:not([type=checkbox]),.sidebar select{width:100%;padding:12px;border:1px solid #c8d4ed;border-radius:12px;background:#fff;color:#16284c}.check{display:flex;gap:8px;margin:20px 0 10px;align-items:center}.side-note{font-size:13px;color:#697895;margin-top:24px}.library{padding:28px}.muted{color:#60718e}.quick{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0}.quick button{font-size:13px}.quick button[aria-pressed=true]{background:#4d3fa7;color:white}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.card{padding:21px;border:1px solid #d9e0f2;border-radius:18px;display:flex;flex-direction:column;gap:8px}.card h3{margin:2px 0;color:#18294e;font-size:20px}.card p{margin:0;color:#64738e;font-size:14px}.tag{display:inline-block;border-radius:30px;padding:4px 10px;background:#eeeaff;color:#5644a7;font-size:12px;font-weight:650;margin-right:6px}.tag.done{background:#e0f4eb;color:#23634e}.card-actions{display:flex;gap:8px;margin-top:auto;padding-top:13px}.pager{display:flex;justify-content:center;align-items:center;gap:12px;margin-top:25px}.lesson{padding:clamp(22px,4vw,42px)}.lesson-top{display:flex;justify-content:space-between;gap:12px;align-items:center}.lesson-kicker{color:#6550b4;font-weight:800;letter-spacing:.1em;font-size:12px}.lesson h2{font-size:clamp(25px,3vw,36px);color:#152449;margin:14px 0 5px}.progress{height:8px;border-radius:30px;background:#e8edf7;margin:25px 0 20px;overflow:hidden}.progress>div{height:100%;width:0;background:linear-gradient(90deg,#5140b2,#268a98);transition:width .2s}.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}.tabs button[aria-current=step]{background:#45379e;color:#fff}.content{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.panel{padding:25px;border:1px solid #dce2f0;border-radius:20px;background:#fff}.panel h3{color:#1a2c50;margin:0 0 12px}.panel p{color:#4e607c}.example{background:#eef1fb;border-radius:13px;padding:17px;margin:12px 0;font-size:19px;color:#1d2d57;font-weight:650}.contrast{background:#fff0ef;border:1px solid #f1c5c4;border-radius:13px;padding:15px;color:#703c3b}.explain{background:#eaf5f0;border:1px solid #b6ddcc;border-radius:13px;padding:15px;margin-top:14px;color:#225643}.choices{display:grid;gap:10px;margin:16px 0}.choice{text-align:left;background:#f1f3f9;color:#243656}.choice.selected{border-color:#6553c0;background:#ebe7fc}.choice.correct{border-color:#50a783;background:#e3f4eb}.choice.incorrect{border-color:#dc9898;background:#fff0ef}.lesson-footer{display:flex;justify-content:space-between;gap:12px;margin-top:25px}.writing{width:100%;min-height:125px;padding:14px;border:1px solid #cbd5e8;border-radius:12px;color:#203152}.stat{font-size:27px;font-weight:800;color:#4d3fa7}.full{grid-column:1/-1}footer{text-align:center;color:#70809b;font-size:13px;padding-top:30px}[hidden]{display:none!important}@media(max-width:850px){.layout{grid-template-columns:1fr}.sidebar{position:static}.content{grid-template-columns:1fr}}@media(max-width:560px){.cards{grid-template-columns:1fr}.shell{padding:14px}.hero{padding:24px}.library,.sidebar,.lesson{padding:20px}.top{padding:0 16px}.top a{font-size:12px}.card-actions{flex-wrap:wrap}}
/* Phase 11B interactive construction activities */
.word-target{min-height:76px;border:2px dashed #b7b9e5;background:#f5f4ff;border-radius:16px;padding:18px;margin:14px 0;color:#222d58;font-size:20px;font-weight:650}
.word-bank{display:flex;flex-wrap:wrap;gap:10px;margin:15px 0 18px}
.word-chip{background:#e9e6fa;border:1px solid #c5c0ed;color:#3e3486}
.word-chip:disabled{opacity:.3}
.grammar-input{width:100%;padding:14px;border:1px solid #c8d4ed;border-radius:12px;margin:10px 0 16px;color:#16284c}
.content .panel button{margin:4px 8px 4px 0}
.tabs{gap:6px}.tabs button{font-size:13px;padding:9px 12px}