:root{--bg:#0b0d10;--panel:#14181d;--panel2:#1a2027;--text:#f5f7fa;--muted:#a9b2bd;--red:#e53935;--red2:#ff5b57;--border:#2a323c;--ok:#2eaf6f;--warn:#d6a128}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial;background:linear-gradient(180deg,#090b0e,#11161b 35%,#0b0d10);color:var(--text);min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:16px clamp(18px,5vw,64px);background:rgba(11,13,16,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}.brand{font-weight:800;color:white;text-decoration:none}.brand:before{content:'●';color:var(--red);margin-right:9px}.topbar nav{display:flex;gap:16px;align-items:center}.topbar nav a{color:#dfe5eb;text-decoration:none}.container{width:min(1180px,92vw);margin:0 auto;padding:34px 0 70px}.hero{padding:70px 0 40px;display:grid;grid-template-columns:1.2fr .8fr;gap:34px;align-items:center}.hero h1{font-size:clamp(38px,6vw,74px);line-height:.98;margin:0 0 20px;letter-spacing:-.04em}.hero h1 span{color:var(--red2)}.hero p{font-size:18px;line-height:1.7;color:var(--muted);max-width:730px}.panel,.card{background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--border);border-radius:18px;padding:24px;box-shadow:0 18px 50px rgba(0,0,0,.22)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.grid.two{grid-template-columns:repeat(2,1fr)}.card h3{margin:0 0 10px}.muted{color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--red);color:#fff!important;border:0;border-radius:10px;padding:12px 18px;font-weight:700;text-decoration:none;cursor:pointer}.btn.secondary{background:#242b33}.btn.outline{background:transparent;border:1px solid #4c5663}.btn.small{padding:8px 12px}.actions{display:flex;gap:10px;flex-wrap:wrap}.form{max-width:680px}.form label{display:block;margin:14px 0 7px;font-weight:650}.form input,.form select,.form textarea{width:100%;padding:12px 13px;border:1px solid #36404b;border-radius:10px;background:#0f1318;color:#fff}.form textarea{min-height:130px}.flash{padding:13px 16px;border-radius:10px;margin-bottom:16px;background:#222}.flash.success{border-left:4px solid var(--ok)}.flash.error{border-left:4px solid var(--red)}.flash.info{border-left:4px solid #4d8ee8}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:12px;border-bottom:1px solid var(--border);white-space:nowrap}.badge{display:inline-block;padding:5px 9px;border-radius:99px;background:#29313a;color:#e7edf3;font-size:12px}.badge.ok{background:#153c2b;color:#88e4b2}.badge.warn{background:#3b3017;color:#f0cd6e}.progress{height:10px;background:#242b32;border-radius:10px;overflow:hidden}.progress span{display:block;height:100%;background:var(--red)}.lesson-shell{position:relative}.watermark{position:fixed;inset:0;pointer-events:none;z-index:12;opacity:.055;background-image:repeating-linear-gradient(-30deg,transparent 0 100px,rgba(255,255,255,.9) 100px 101px);display:flex;align-items:center;justify-content:center;font-size:28px;transform:rotate(-22deg)}.lesson-content{position:relative;z-index:2;background:#fff;color:#16191d;border-radius:18px;padding:32px;min-height:60vh}.lesson-content iframe,.lesson-content video,.lesson-content img{max-width:100%;border-radius:12px}.present-mode .topbar,.present-mode footer{display:none}.present-mode .container{width:100%;padding:0}.present-mode .lesson-content{border-radius:0;min-height:100vh}.stat{font-size:34px;font-weight:800}.kicker{text-transform:uppercase;letter-spacing:.14em;font-size:12px;color:var(--red2);font-weight:800}.sidebar-layout{display:grid;grid-template-columns:240px 1fr;gap:20px}.sidebar a{display:block;padding:10px 12px;border-radius:9px;color:#dce3ea;text-decoration:none;margin:4px 0}.sidebar a:hover{background:#202730}footer{text-align:center;padding:26px;color:#77818d;border-top:1px solid var(--border)}@media(max-width:800px){.hero,.grid,.grid.two,.sidebar-layout{grid-template-columns:1fr}.topbar{padding:14px 18px}.topbar nav{gap:9px}.container{width:min(94vw,1180px)}}