:root{--navy:#10233f;--navy2:#17375f;--cyan:#22b8cf;--gold:#f0b94b;--bg:#f3f6fa;--card:#fff;--text:#132238;--muted:#6b7b90;--line:#dfe6ee;--shadow:0 16px 45px rgba(16,35,63,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 Inter,Segoe UI,Arial,sans-serif}button,input,textarea,select{font:inherit}.topbar{position:fixed;z-index:20;left:0;right:0;top:0;height:72px;background:var(--navy);color:white;display:flex;align-items:center;padding:0 28px;box-shadow:0 4px 18px #0002}.brand{display:flex;align-items:center;gap:12px;color:white;text-decoration:none}.brand>span:last-child{display:flex;flex-direction:column;line-height:1.15;font-size:18px}.brand small{color:#afbdd0;font-size:10px;letter-spacing:.08em}.logo{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,var(--cyan),#1474bc);font-weight:900}.session-chip{margin-left:auto;margin-right:14px;background:#ffffff12;padding:7px 12px;border:1px solid #ffffff20;border-radius:99px;font-size:12px}.session-chip span:first-child{display:inline-block;width:8px;height:8px;background:#8999ae;border-radius:50%;margin-right:7px}.session-chip.live span:first-child{background:#57e389;box-shadow:0 0 0 4px #57e38922}.ghost{border:0;color:white;background:#ffffff12;border-radius:10px;width:38px;height:38px;cursor:pointer}.sidebar{position:fixed;z-index:10;top:72px;bottom:0;width:220px;background:#fff;border-right:1px solid var(--line);padding:24px 14px;display:flex;flex-direction:column}.sidebar nav{display:grid;gap:7px}.sidebar a{padding:11px 14px;border-radius:10px;text-decoration:none;color:var(--muted);font-weight:650}.sidebar a:hover,.sidebar a.active{background:#e9f7fb;color:#087f95}.version{margin-top:auto;padding:14px;color:#9aa7b7;font-size:11px}main{margin-left:220px;padding:104px 34px 42px;max-width:1500px}.hero{min-height:330px;border-radius:26px;padding:48px;display:grid;grid-template-columns:1.5fr .75fr;gap:32px;align-items:center;background:radial-gradient(circle at 80% 15%,#22b8cf55,transparent 24%),linear-gradient(135deg,#10233f,#17375f);color:white;box-shadow:var(--shadow)}.eyebrow{margin:0 0 5px;color:var(--cyan);font-size:11px;font-weight:850;letter-spacing:.16em}.hero h1{font-size:42px;line-height:1.1;margin:7px 0 15px}.hero h1 em{color:#62d5e5;font-style:normal}.hero>div>p:not(.eyebrow){color:#c3cfde;max-width:650px}.actions{display:flex;gap:10px;margin-top:24px}.primary,.secondary,.small-btn{border:0;border-radius:11px;padding:11px 17px;cursor:pointer;font-weight:750}.primary{background:var(--cyan);color:#062936}.primary:hover{filter:brightness(1.07)}.secondary{background:#ffffff12;color:inherit;border:1px solid #ffffff2f}.hero-card{background:#ffffff10;border:1px solid #ffffff22;border-radius:20px;padding:25px;backdrop-filter:blur(8px)}.hero-card>span{font-size:10px;color:#8de2ec;letter-spacing:.14em}.hero-card h3{margin:8px 0 0;font-size:22px}.hero-card p{margin:0;color:#b9c8da}.timer{font-size:37px;font-weight:800;letter-spacing:.08em;margin:22px 0 0}.hero-card small{color:#98a9be}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:20px 0 45px}.stats article{background:var(--card);border:1px solid var(--line);padding:20px;border-radius:16px;display:flex;align-items:center;gap:14px;box-shadow:0 8px 24px #10233f08}.stats article>span{width:42px;height:42px;display:grid;place-items:center;background:#e8f8fa;color:#0693a8;border-radius:12px;font-size:20px}.stats div{display:flex;flex-direction:column}.stats b{font-size:22px}.stats small{color:var(--muted)}section{scroll-margin-top:90px}.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.section-head h2{margin:0;font-size:25px}.small-btn{background:var(--navy);color:white;padding:8px 13px}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px;margin-bottom:42px}.course{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 7px 22px #10233f08}.course-top{height:8px;background:var(--accent)}.course-body{padding:21px}.tag{font-size:10px;font-weight:800;color:var(--accent);letter-spacing:.1em}.course h3{font-size:19px;margin:5px 0}.course p,.course small{color:var(--muted)}.progress{height:7px;background:#e8edf3;border-radius:10px;overflow:hidden;margin:15px 0 8px}.progress i{display:block;height:100%;width:var(--progress);background:var(--accent)}.course-foot{display:flex;justify-content:space-between;align-items:center}.course button{border:0;background:none;color:var(--accent);cursor:pointer;font-weight:800}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px}.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 7px 22px #10233f08}.list{display:grid;gap:10px}.list-item{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:12px}.file-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;background:#e9f7fb;color:#078ea3;font-weight:900}.list-item div{flex:1}.list-item b{display:block}.list-item small{color:var(--muted)}.list-item a{color:#078ea3;text-decoration:none;font-weight:750}.empty{color:var(--muted);place-items:center;min-height:120px}.forum{margin-bottom:30px}.forum-list{display:grid;gap:10px}.question{padding:16px;border:1px solid var(--line);border-radius:13px;display:grid;grid-template-columns:48px 1fr auto;gap:14px;align-items:center}.avatar{width:44px;height:44px;display:grid;place-items:center;border-radius:50%;background:var(--navy);color:white;font-weight:800}.question h3{font-size:15px;margin:0}.question p{margin:3px 0;color:var(--muted);font-size:13px}.status{font-size:10px;border-radius:99px;padding:5px 9px;background:#e8f7ef;color:#178451;font-weight:800}footer{text-align:center;color:var(--muted);padding:22px;margin-left:220px;font-size:12px}dialog{border:0;border-radius:20px;padding:0;width:min(490px,92vw);box-shadow:0 30px 80px #0005}dialog::backdrop{background:#07182aaa;backdrop-filter:blur(3px)}dialog form{padding:28px;position:relative}dialog h2{margin:3px 0 18px}.dialog-close{position:absolute;right:18px;top:14px;border:0;background:none;font-size:27px;cursor:pointer}.field{display:grid;gap:5px;margin:12px 0}.field label{font-size:12px;font-weight:750}.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px;background:white;color:#132238}.field textarea{min-height:95px;resize:vertical}menu{display:flex;justify-content:flex-end;gap:9px;margin:20px 0 0;padding:0}dialog .secondary{color:var(--text);border-color:var(--line)}
body.dark{--bg:#091523;--card:#10233f;--text:#e7eef7;--muted:#9eb0c6;--line:#243b59}.dark .sidebar{background:#0d1d31}.dark .field input,.dark .field textarea,.dark .field select{background:#0d1d31;color:white}
@media(max-width:900px){.sidebar{width:64px}.sidebar a{padding:11px;text-align:center}.sidebar a span,.version{display:none}main{margin-left:64px;padding:94px 18px 30px}.hero{grid-template-columns:1fr;padding:30px}.hero h1{font-size:34px}.stats,.course-grid{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}footer{margin-left:64px}}
@media(max-width:560px){.topbar{padding:0 14px}.brand small,.session-chip{display:none}.sidebar{top:auto;bottom:0;left:0;right:0;width:auto;height:66px;border-top:1px solid var(--line);padding:8px}.sidebar nav{grid-template-columns:repeat(5,1fr)}main{margin:0;padding:90px 12px 80px}.hero{padding:24px;border-radius:20px}.hero h1{font-size:30px}.hero-card{display:none}.stats{grid-template-columns:repeat(2,1fr);margin-bottom:35px}.stats article{padding:14px}.course-grid{grid-template-columns:1fr}.question{grid-template-columns:40px 1fr}.question .status{grid-column:2}.actions{flex-direction:column}footer{margin:0 0 65px}}