:root{--ink:#092a38;--teal:#0a6076;--aqua:#18a8b8;--gold:#d7a94b;--soft:#f3f8f9;--line:#d9e7ea;--muted:#5d7078}.classroom-page{background:#fff;color:var(--ink)}.lesson-container{width:min(1180px,calc(100% - 40px));margin-inline:auto}.classroom-hero{padding:76px 0 50px;background:radial-gradient(circle at 82% 10%,#dff8f9 0,transparent 35%),linear-gradient(180deg,#f9fcfd,#fff)}.classroom-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}.lesson-kicker{display:inline-block;font-size:.78rem;letter-spacing:.12em;font-weight:900;color:var(--teal)}.classroom-hero h1{font-size:clamp(2.3rem,5vw,4.7rem);line-height:1.05;margin:.8rem 0 1rem}.classroom-hero p{color:var(--muted);line-height:1.85;font-size:1.05rem}.classroom-hero-card{background:#fff;border:1px solid var(--line);border-radius:28px;padding:20px;box-shadow:0 24px 70px rgba(8,49,64,.12)}.mini-thumb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.mini-thumb{margin:0;position:relative}.mini-thumb img{display:block;width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:13px}.mini-thumb figcaption{position:absolute;left:7px;bottom:7px}.mini-thumb figcaption b{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#fff;color:var(--teal);box-shadow:0 4px 14px rgba(0,0,0,.12)}.mini-thumb figcaption span{display:none}.lesson-section{padding:72px 0}.lesson-section.soft{background:var(--soft)}.lesson-heading{max-width:760px;margin-bottom:30px}.lesson-heading h2{font-size:clamp(2rem,4vw,3.4rem);margin:.55rem 0}.lesson-heading p{color:var(--muted);line-height:1.85}.featured-lesson{display:grid;grid-template-columns:.9fr 1.1fr;gap:36px;align-items:center;background:#082d3c;border-radius:30px;padding:30px;color:#fff}.featured-lesson .copy p{color:#d6e6ea;line-height:1.8}.featured-lesson .copy h2{font-size:clamp(2rem,4vw,3.5rem);margin:.5rem 0}.lesson-btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:999px;padding:.85rem 1.15rem;font-weight:900;text-decoration:none;cursor:pointer}.lesson-btn.primary{background:#f3c65e;color:#18303a}.lesson-btn.secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}.site-footer-simple{padding:34px 0;background:#071b25;color:#cbdadd;margin-top:0}.site-footer-simple a{color:#fff}.site-footer-simple .footer-line{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.ak-site-shell{position:sticky;top:0;z-index:50}.classroom-nav-actions{display:flex;gap:.65rem;flex-wrap:wrap}.classroom-cta{margin-top:1.2rem;display:flex;gap:.8rem;flex-wrap:wrap}@media(max-width:840px){.classroom-hero-grid,.featured-lesson{grid-template-columns:1fr}.classroom-hero{padding-top:42px}.lesson-section{padding:52px 0}}@media(max-width:520px){.lesson-container{width:min(100% - 24px,1180px)}.mini-thumb-grid{gap:5px}.featured-lesson{padding:20px;border-radius:22px}}
.book-feature{background:radial-gradient(circle at 90% 0,rgba(68,178,255,.2),transparent 30%),linear-gradient(135deg,#071726,#0b3347)}.book-feature-visual{position:relative;min-height:360px;padding:54px 26px 30px;border:1px solid rgba(114,216,226,.27);background:linear-gradient(145deg,rgba(8,27,43,.96),rgba(4,14,24,.96));display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;overflow:hidden}.book-feature-visual:before{content:"";position:absolute;inset:0;opacity:.16;background-image:linear-gradient(rgba(114,216,226,.22) 1px,transparent 1px),linear-gradient(90deg,rgba(114,216,226,.22) 1px,transparent 1px);background-size:34px 34px}.book-feature-label,.book-feature-status{position:absolute;z-index:1;color:#72d8e2;font:700 .65rem/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.13em}.book-feature-label{left:18px;top:16px}.book-feature-status{right:18px;bottom:14px;color:#58e5a4}.book-feature-book,.book-feature-screen{position:relative;z-index:1;min-height:210px;border:1px solid rgba(243,198,94,.38);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:linear-gradient(135deg,#142a3a,#091622);box-shadow:0 22px 45px rgba(0,0,0,.3)}.book-feature-book{border-radius:2px 13px 13px 2px;box-shadow:-8px 9px 0 rgba(65,117,141,.28),0 22px 45px rgba(0,0,0,.3)}.book-feature-screen{border-color:rgba(114,216,226,.35);border-radius:8px}.book-feature-book small,.book-feature-screen small{color:#7896a8;font:700 .6rem/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.12em}.book-feature-book strong,.book-feature-screen strong{margin:12px 0 7px;color:#f3c65e;font-size:1.7rem;letter-spacing:.08em}.book-feature-screen strong{color:#72d8e2}.book-feature-book span,.book-feature-screen span{font-size:.7rem;color:#8fa8b8}.book-feature-arrow{position:relative;z-index:1;color:#72d8e2;font-size:1.5rem}@media(max-width:650px){.book-feature-visual{min-height:500px;grid-template-columns:1fr;grid-template-rows:1fr auto 1fr}.book-feature-book,.book-feature-screen{min-height:175px}.book-feature-arrow{transform:rotate(90deg);text-align:center}}
.co-space-feature{background:linear-gradient(135deg,#fff1f7,#ecfeff);color:var(--ink);border:1px solid #cfdee4;box-shadow:0 22px 60px rgba(16,67,83,.1)}.co-space-feature .copy p{color:#506b76}.co-space-feature .lesson-kicker{color:#b42370}.co-space-feature-visual{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:center;padding:26px;border:1px solid #e4cad8;border-radius:24px;background:rgba(255,255,255,.75)}.co-space-feature-visual div{min-height:170px;padding:22px 14px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;border-radius:18px;background:#fff;box-shadow:0 12px 28px rgba(50,80,95,.08)}.co-space-feature-visual b{color:#db2777;font-size:13px}.co-space-feature-visual strong{margin:12px 0 5px;font-size:19px}.co-space-feature-visual span{color:#637983;font-size:13px}.co-space-feature-visual i{color:#0f9f8b;font-size:24px;font-style:normal}@media(max-width:700px){.co-space-feature-visual{grid-template-columns:1fr}.co-space-feature-visual i{transform:rotate(90deg)}.co-space-feature-visual div{min-height:120px}}