:root{--edu-bg:#080e1b;--edu-line:#263246;--edu-muted:#a9b5c9;--edu-accent:#85ebcf}*{box-sizing:border-box}body{margin:0;background:var(--edu-bg);color:#eef4ff;font-family:Inter,system-ui,sans-serif}a{color:var(--edu-accent);text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer;border:1px solid #47615e;background:#153b34;color:#caffef;padding:11px 16px;border-radius:10px}button:disabled{opacity:.55;cursor:wait}button:hover{border-color:var(--edu-accent)}:focus-visible{outline:3px solid #85ebcf;outline-offset:3px}.skip{position:absolute;left:-10000px}.skip:focus{left:12px;top:12px;z-index:20;background:#081521;padding:14px}.top{height:80px;padding:0 34px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--edu-line);background:#0b1321}.brand{font-size:23px;font-weight:800;color:white;letter-spacing:2px}.brand span{font-size:10px;display:block;letter-spacing:4px;color:var(--edu-accent);margin-top:3px}.top nav{display:flex;gap:24px}.top nav a{color:#b9c7da;font-size:14px}.layout{display:grid;grid-template-columns:220px minmax(0,1fr);max-width:1600px;margin:auto}.sidebar{padding:32px 20px;border-right:1px solid var(--edu-line);position:sticky;top:0;align-self:start;height:calc(100vh - 80px)}.sidebar small,.section-head small,.hero small{color:var(--edu-accent);font-size:11px;letter-spacing:2px}.sidebar button{display:block;width:100%;text-align:left;margin:10px 0;background:transparent;border-color:transparent;color:#a9b5c9}.sidebar button.selected{background:#142a2b;color:#bdffe9;border-color:#2e5f53}.side-links{border-top:1px solid var(--edu-line);margin-top:25px;padding-top:15px}.side-links a{display:block;padding:10px 0;font-size:13px}.sidebar p{color:#73869f;font-size:13px;line-height:1.9;margin-top:50px}main{padding:30px 40px;min-width:0}.hero{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;min-height:330px;padding:25px 30px;background:radial-gradient(ellipse at 80% 35%,#173a49,transparent 70%),linear-gradient(120deg,#121c32,#0d1728);border:1px solid #26354c;border-radius:24px;overflow:hidden}.hero h1{font-size:clamp(32px,4vw,58px);line-height:1.12;letter-spacing:-2px;margin:16px 0}.hero em{font-style:normal;color:var(--edu-accent)}.hero p{color:#aebed1;line-height:1.7;max-width:480px;font-size:15px}.hero-art{position:relative;display:grid;place-items:center;min-height:280px}.orb{width:200px;height:200px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at 30% 20%,#89e8cf,#256b83 40%,#122344 70%);box-shadow:0 0 70px #47b8ac28,inset -25px -20px 45px #040e28;font-size:80px;font-weight:300;color:#dcfff3;position:relative}.orb span{position:absolute;font-size:8px;letter-spacing:2px;bottom:42px}.orbit{position:absolute;width:280px;height:200px;border:1px solid #76b9c25c;border-radius:50%;transform:rotate(-25deg)}.float{position:absolute;background:#172737ed;border:1px solid #476571;border-radius:12px;padding:12px;font-size:12px;box-shadow:0 10px 30px #0004}.one{top:32px;left:0}.two{bottom:22px;right:0}.status{min-height:24px;color:#baffe7;line-height:1.6}.panel{margin:30px 0}.panel[hidden]{display:none}.section-head{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:20px}.section-head h2{margin:8px 0;font-size:25px}.section-head>span{font-size:12px;color:var(--edu-muted)}.filters{display:grid;grid-template-columns:2fr 1.5fr 1fr auto;gap:10px;margin-bottom:24px}input,select,textarea{background:#0c1627;color:#e7f0ff;border:1px solid #354258;border-radius:9px;padding:11px;width:100%;min-width:0}textarea{min-height:100px;resize:vertical}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.edu-card{border:1px solid #29384d;border-radius:16px;background:linear-gradient(145deg,#142033,#101928);padding:20px;display:flex;flex-direction:column;gap:12px}.edu-card h3{font-size:19px;margin:0}.edu-card p{font-size:14px;color:var(--edu-muted);line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}.edu-card small{font-size:11px;color:#85ebcf}.edu-card .actions{margin-top:auto;display:flex;gap:8px;flex-wrap:wrap}.tag{display:inline-block;background:#1a3432;color:#a6eedc;border-radius:6px;padding:5px 8px;font-size:11px}.manage-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-bottom:24px}details,.lesson,.assignment{border:1px solid #29384d;border-radius:14px;padding:20px;background:#101a2b;margin:14px 0}summary{cursor:pointer;color:#cff8eb;font-weight:600}form label{display:block;font-size:13px;color:#bdcadb;margin:14px 0}label input,label textarea,label select{margin-top:7px}.check{display:flex;align-items:center;gap:10px}.check input{width:auto}.lesson p,.assignment p{white-space:pre-wrap;line-height:1.7;overflow-wrap:anywhere}.class-head{display:flex;gap:20px;justify-content:space-between;align-items:center}.progress{background:#172b37;border-radius:20px;height:8px;overflow:hidden;margin:15px 0}.progress span{display:block;height:100%;background:var(--edu-accent)}.student{padding:15px;border-bottom:1px solid #29384d;display:flex;gap:12px;align-items:center;flex-wrap:wrap}.student b{margin-right:auto}footer{border-top:1px solid #263246;padding:25px 0;margin-top:45px;display:flex;justify-content:space-between;color:#788b9f;font-size:13px}@media(max-width:1100px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.layout{grid-template-columns:180px minmax(0,1fr)}main{padding:24px}.hero{padding:25px}.orb{width:155px;height:155px}.hero-art{min-height:230px}.orbit{width:200px;height:150px}}@media(max-width:750px){.top{padding:16px;height:auto;gap:15px;flex-wrap:wrap}.top nav{gap:15px;flex-wrap:wrap}.layout{display:block}.sidebar{position:static;height:auto;border-right:0;display:flex;flex-wrap:wrap;gap:5px;padding:15px}.sidebar small,.side-links,.sidebar p{display:none}.sidebar button{width:auto;margin:0;padding:8px}.hero{grid-template-columns:1fr}.hero-art{display:none}main{padding:15px}.filters{grid-template-columns:1fr 1fr}.cards,.manage-grid{grid-template-columns:1fr}.section-head{align-items:start}.section-head>span{display:none}.hero h1{font-size:40px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.status:not(:empty){position:sticky;top:12px;z-index:20;padding:12px 16px;background:#142b2b;border:1px solid #376154;border-radius:12px;box-shadow:0 8px 24px #0004}.notice{padding:12px 14px;background:#17352f;border:1px solid #2e5146;border-radius:10px;line-height:1.7;overflow-wrap:anywhere}.student .notice{flex-basis:100%}