@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;600;700;800;900&display=swap');
[hidden]{display:none!important}
:root{--blue:#0c66a1;--deep:#06466f;--ink:#132934;--muted:#627781;--line:#c9dce6;--soft:#eef6fa;--green:#158565;--orange:#c96512}*{box-sizing:border-box}body{margin:0;background:#f4f8fa;color:var(--ink);font-family:"DM Sans",sans-serif}.classroom-topbar{position:sticky;top:0;z-index:10;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;min-height:76px;padding:12px clamp(18px,4vw,56px);border-bottom:1px solid #d5e3e9;background:#fffffff2;backdrop-filter:blur(18px)}.classroom-topbar img{width:180px;max-height:50px;object-fit:contain}.classroom-topbar a,.classroom-topbar button{width:max-content;border:0;background:transparent;color:var(--deep);font:800 14px inherit;text-decoration:none}.classroom-topbar button{justify-self:end;cursor:pointer}.classroom-shell{width:min(1280px,calc(100% - 32px));margin:32px auto 80px}.classroom-state{display:grid;place-items:center;gap:13px;min-height:420px;padding:50px;border:1px solid var(--line);border-radius:28px;background:#fff;text-align:center}.classroom-state>span{display:grid;place-items:center;width:74px;height:74px;border-radius:24px;background:#dff1f8;color:var(--blue);font-size:38px}.classroom-state h1{margin:0;font-size:clamp(27px,4vw,44px)}.classroom-state p{margin:0;color:var(--muted)}.classroom-state a{margin-top:10px;border-radius:999px;padding:13px 19px;background:var(--blue);color:#fff;font-weight:900;text-decoration:none}.classroom-hero{display:grid;grid-template-columns:1fr 290px;gap:28px;align-items:center;padding:36px;border-radius:28px;background:linear-gradient(125deg,#063a5d,#0a7392);color:#fff;box-shadow:0 20px 55px #0a517528}.classroom-hero p,.classroom-player-heading p,.classroom-welcome>p:first-child{margin:0 0 9px;font-size:12px;font-weight:900;letter-spacing:.14em}.classroom-hero h1{margin:0 0 10px;font-size:clamp(30px,4vw,52px);line-height:1.05}.classroom-hero span{color:#d8eff7}.classroom-progress-card{display:grid;gap:3px;padding:22px;border:1px solid #ffffff52;border-radius:22px;background:#ffffff16;backdrop-filter:blur(12px)}.classroom-progress-card strong{font-size:38px}.classroom-progress-card span{color:#fff;font-weight:800}.classroom-progress-card div{height:9px;margin:10px 0 5px;border-radius:99px;background:#ffffff38;overflow:hidden}.classroom-progress-card i{display:block;width:0;height:100%;border-radius:inherit;background:#56d0bc;transition:width .25s}.classroom-progress-card small{color:#d8eff7}.classroom-notice{margin:16px 0;padding:13px 18px;border:1px solid #cde1e9;border-radius:16px;background:#fff;color:var(--muted);font-weight:700}.classroom-notice:empty{display:none}.classroom-notice[data-state="expired"],.classroom-notice[data-state="suspended"]{border-color:#ebc88c;background:#fff6e3;color:#80500e}.classroom-layout{display:grid;grid-template-columns:360px minmax(0,1fr);gap:20px;margin-top:20px}.classroom-sidebar,.classroom-content{border:1px solid var(--line);border-radius:24px;background:#fff;overflow:hidden}.classroom-sidebar{padding:18px}.classroom-sidebar>label{display:block;margin:0 0 7px;color:var(--muted);font-size:11px;font-weight:900;letter-spacing:.08em}.classroom-sidebar>select{width:100%;min-height:48px;margin-bottom:18px;border:1px solid var(--line);border-radius:13px;padding:10px;background:#fff;color:var(--ink);font:800 14px inherit}.classroom-module{margin-top:13px}.classroom-module h2{margin:0 0 8px;color:var(--deep);font-size:15px}.classroom-lesson{display:grid;grid-template-columns:32px 1fr auto;gap:10px;align-items:center;width:100%;margin:7px 0;border:1px solid #dce8ed;border-radius:14px;padding:11px;background:#f9fbfc;color:var(--ink);text-align:left;cursor:pointer}.classroom-lesson:hover,.classroom-lesson:focus-visible,.classroom-lesson.active{border-color:#62b5d7;background:#eaf6fb}.classroom-lesson:disabled{cursor:not-allowed;opacity:.58}.classroom-lesson>span:first-child{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#e1eef4;color:var(--blue);font-weight:900}.classroom-lesson.completed>span:first-child{background:#dff3eb;color:var(--green)}.classroom-lesson strong{display:block;font-size:13px;line-height:1.25}.classroom-lesson small{display:block;margin-top:3px;color:var(--muted);font-size:10px}.classroom-lesson>span:last-child{color:var(--blue);font-size:11px;font-weight:900}.classroom-content{min-height:570px;padding:26px}.classroom-welcome{display:grid;place-items:center;align-content:center;min-height:510px;padding:35px;text-align:center}.classroom-welcome>p:first-child,.classroom-player-heading p{color:var(--blue)}.classroom-welcome h2{margin:0 0 10px;font-size:clamp(27px,4vw,44px)}.classroom-welcome p:last-child{max-width:520px;margin:0;color:var(--muted)}.classroom-player-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:18px}.classroom-player-heading h2{margin:0;font-size:clamp(22px,3vw,34px)}.classroom-player-heading>span{border-radius:999px;padding:8px 12px;background:#e8f4fa;color:var(--blue);font-weight:900}.classroom-player{position:relative;overflow:hidden;width:100%;padding-top:56.25%;border-radius:18px;background:#061b27}.classroom-player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.classroom-player-message{min-height:22px;color:var(--muted);font-size:13px}.classroom-player-message.error{color:#a02d2d;font-weight:800}@media(max-width:820px){.classroom-topbar{grid-template-columns:1fr auto}.classroom-topbar img{display:none}.classroom-hero{grid-template-columns:1fr}.classroom-layout{grid-template-columns:1fr}.classroom-content{min-height:420px}.classroom-welcome{min-height:360px}.classroom-shell{width:min(100% - 20px,1280px);margin-top:12px}.classroom-hero{padding:24px}.classroom-content{padding:16px}}@media(max-width:480px){.classroom-topbar{min-height:64px}.classroom-topbar a,.classroom-topbar button{font-size:12px}.classroom-hero{border-radius:21px}.classroom-sidebar,.classroom-content{border-radius:19px}.classroom-player-heading{align-items:start;flex-direction:column}}