.classroom-head{margin:24px 0 24px;padding:clamp(28px,5vw,56px);border-radius:22px;color:white;background:radial-gradient(circle at 90% 15%,#316386a8,transparent 40%),linear-gradient(125deg,#0a1e32,#173e5b)}.classroom-head>a{color:#e1eef6;font-size:.85rem}.classroom-head>span{display:block;color:#f3c77b;font-size:.7rem;font-weight:850;letter-spacing:.18em;margin-top:32px}.classroom-head h1{font-size:clamp(2rem,3.7vw,3.8rem);letter-spacing:-.05em;line-height:1.1;margin:12px 0}.classroom-head p{color:#d6e5ed;line-height:1.6;max-width:700px}.classroom-head strong{font-size:.85rem;color:#f6d79a}.classroom-progress{height:9px;border-radius:10px;background:#ffffff34;overflow:hidden;max-width:650px;margin:23px 0 10px}.classroom-progress div{height:100%;background:linear-gradient(90deg,#d7a150,#f8d793);border-radius:10px}.classroom-grid{display:grid;grid-template-columns:minmax(235px,310px) minmax(0,1fr);gap:25px;align-items:start;max-width:1250px;margin:0 auto 80px}.classroom-nav,.classroom-content{background:#fff;border:1px solid #dce6ef;border-radius:17px;min-width:0}.classroom-nav{padding:17px;max-height:calc(100svh - 35px);overflow:auto;position:sticky;top:15px}.classroom-nav h2{font-size:1.12rem;margin:6px 8px 20px}.classroom-nav h3{color:#a77637;font-size:.68rem;text-transform:uppercase;letter-spacing:.13em;margin:23px 10px 8px}.classroom-nav a{display:flex;gap:10px;align-items:start;color:#2b4258;padding:11px 9px;border-radius:9px;font-size:.86rem;line-height:1.4}.classroom-nav a:hover,.classroom-nav a.is-current{background:#e9f1f7;text-decoration:none;color:#112c44}.classroom-nav a span{display:grid;place-items:center;flex:none;width:23px;height:23px;border-radius:50%;background:#eaf0f5;color:#b07d3c;font-size:.7rem;font-weight:800}.classroom-nav a.is-current span{background:#173f5c;color:#fff}.classroom-content{padding:clamp(22px,4vw,50px)}.classroom-label{color:#b48240;font-size:.73rem;letter-spacing:.15em;font-weight:850}.classroom-content h2{color:#112a41;font-size:clamp(1.85rem,3vw,2.9rem);letter-spacing:-.04em;line-height:1.16;margin:12px 0 28px}.classroom-reading{max-width:800px}.classroom-reading h3{font-size:.77rem;letter-spacing:.12em;color:#a36e2e;margin:28px 0 10px}.classroom-reading p{line-height:1.8;color:#3e566b;margin:0 0 22px;white-space:normal}.classroom-quiz{background:#f5f8fb;border:1px solid #e0e9f0;border-radius:14px;padding:clamp(18px,3vw,31px);margin:38px 0;scroll-margin-top:25px}.classroom-quiz>span{font-size:.68rem;letter-spacing:.16em;color:#a97536;font-weight:850}.classroom-quiz h3{font-size:1.5rem;margin:8px 0}.classroom-quiz>p{color:#536b7d;line-height:1.6}.classroom-quiz fieldset{border:0;border-top:1px solid #dce5ed;padding:18px 0;margin:0}.classroom-quiz legend{font-weight:750;color:#19374d;padding-top:17px}.classroom-quiz label{display:block;padding:9px 10px;border-radius:7px;color:#365064;font-size:.93rem}.classroom-quiz label:hover{background:#e7f0f6}.classroom-quiz input{accent-color:#174e73;margin-right:8px}.classroom-quiz fieldset small{display:block;color:#416d57;background:#e4f2e9;border-radius:6px;padding:8px 11px;margin-top:10px}.quiz-result{padding:12px 15px;border-radius:8px;margin:16px 0;font-weight:750}.quiz-result.passed,.classroom-done{background:#e5f4e9;color:#1e6843}.quiz-result.retry{background:#fff2df;color:#8a5720}.classroom-done{padding:12px 15px;border-radius:8px}.classroom-next{display:inline-flex;margin:25px 0 0;font-weight:800}.classroom-content>form{margin-top:25px}
@media(max-width:800px){.classroom-grid{grid-template-columns:1fr}.classroom-nav{position:static;max-height:240px}.classroom-head{margin:15px 0}.classroom-content{padding:25px}}
@media(max-width:500px){.classroom-head{border-radius:14px;padding:27px 22px}.classroom-nav{max-height:220px}.classroom-content{padding:22px 17px}.classroom-quiz{padding:18px}}
.classroom-materials{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin-top:19px;color:#d6e5ed;font-size:.83rem}.classroom-materials a{color:#fff;border:1px solid #ffffff73;border-radius:50px;padding:7px 11px;font-weight:750}.classroom-materials a:hover{background:#ffffff24;text-decoration:none}

/* V23 · Aula multimedia */
.lesson-heading{padding-bottom:20px;border-bottom:1px solid #e3ebf1}.lesson-heading h2{margin-bottom:10px}.lesson-heading__hint{margin:0;color:#61778a;line-height:1.6}.lesson-video{margin:28px 0 34px;padding:14px;border:1px solid #d6e4ee;border-radius:20px;background:linear-gradient(145deg,#081d34,#103f60);box-shadow:0 20px 45px rgba(9,37,62,.16)}.lesson-video__heading{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:5px 8px 13px;color:#fff}.lesson-video__heading span{font-size:.67rem;font-weight:900;letter-spacing:.16em;color:#f4bd61}.lesson-video__heading strong{font-size:.88rem}.lesson-video__frame{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:13px;background:#020914}.lesson-video__frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.lesson-video>p{margin:12px 8px 4px;color:#cfe0ec;font-size:.8rem}.lesson-video-link{display:inline-flex;margin:24px 0;padding:12px 17px;border-radius:10px;background:#113d5d;color:#fff;font-weight:800}.lesson-guide{margin:28px 0;padding:clamp(20px,3vw,34px);border:1px solid #e0e8ef;border-radius:18px;background:linear-gradient(145deg,#fff,#f8fafc)}.lesson-guide__title>span,.lesson-gallery>span,.lesson-resources>span{color:#a76c24;font-size:.68rem;font-weight:900;letter-spacing:.16em}.lesson-guide__title h3,.lesson-gallery>h3,.lesson-resources>h3{margin:7px 0 20px;color:#102f49;font-size:1.35rem}.lesson-gallery{margin:32px 0}.lesson-gallery>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.lesson-gallery a{overflow:hidden;border:1px solid #dae5ed;border-radius:14px;background:#fff;color:#18364e;box-shadow:0 10px 25px rgba(11,42,67,.08);transition:transform .25s,box-shadow .25s}.lesson-gallery a:hover{transform:translateY(-4px);box-shadow:0 17px 34px rgba(11,42,67,.14);text-decoration:none}.lesson-gallery img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover}.lesson-gallery strong{display:block;padding:12px 14px}.lesson-resources{margin:34px 0}.lesson-resources>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-resources a{display:flex;align-items:center;gap:13px;min-width:0;padding:15px;border:1px solid #dce6ed;border-radius:13px;background:#fff;color:#173750;box-shadow:0 8px 20px rgba(12,43,68,.06);transition:transform .25s,border-color .25s}.lesson-resources a:hover{transform:translateY(-3px);border-color:#7ca8c3;text-decoration:none}.lesson-resources a span{min-width:0;flex:1}.lesson-resources a strong,.lesson-resources a small{display:block}.lesson-resources a small{margin-top:4px;color:#708395;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lesson-resources a i{font-style:normal;font-size:.72rem;font-weight:800;color:#986324}.resource-type{display:grid;place-items:center;flex:none;width:45px;height:45px;border-radius:12px;background:linear-gradient(145deg,#184f75,#0b2943);color:#fff;font-size:.67rem;box-shadow:0 8px 15px rgba(11,45,70,.2)}.lesson-pagination{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin-top:35px;padding-top:25px;border-top:1px solid #e0e8ef}.lesson-pagination a{display:flex;flex-direction:column;gap:6px;padding:15px 17px;border:1px solid #dce6ed;border-radius:12px;color:#17374f}.lesson-pagination a:hover{background:#f3f7fa;text-decoration:none}.lesson-pagination a.is-next{text-align:right}.lesson-pagination span{font-size:.65rem;font-weight:900;letter-spacing:.12em;color:#a76d28}.editor-workflow{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:22px 0;padding:15px;border-radius:14px;background:#edf4f8}.editor-workflow span{display:flex;align-items:center;gap:9px;color:#315068;font-size:.82rem;font-weight:700}.editor-workflow b{display:grid;place-items:center;width:27px;height:27px;border-radius:50%;background:#123d5d;color:#fff}.video-url-field{padding:17px;border:1px solid #dce6ed;border-radius:13px;background:#f8fbfd}.video-url-field small,.lesson-editor label small{display:block;margin-top:7px;color:#687e90;font-weight:400;line-height:1.5}
@media(max-width:760px){.lesson-resources>div,.lesson-gallery>div{grid-template-columns:1fr}.editor-workflow{grid-template-columns:1fr}.lesson-pagination{grid-template-columns:1fr}.lesson-pagination a.is-next{text-align:left}.lesson-pagination>span:empty{display:none}.lesson-video{margin-inline:-8px;padding:8px;border-radius:15px}.lesson-video__heading{align-items:flex-start;flex-direction:column}.lesson-resources a i{display:none}}
@media(prefers-reduced-motion:reduce){.lesson-gallery a,.lesson-resources a{transition:none}.lesson-gallery a:hover,.lesson-resources a:hover{transform:none}}