
:root{--bg:#06121f;--panel:#0b1c2f;--panel2:#102943;--line:#20476e;--text:#edf6ff;--muted:#9db5cc;--brand:#62d0ff;--accent:#8b7cff;--ok:#4fe2a0;--warn:#ffcf6a;--shadow:0 24px 70px rgba(0,0,0,.28)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;background:radial-gradient(circle at 10% 0,#12345a 0,transparent 30%),linear-gradient(135deg,#06121f,#08192a 55%,#06101a);color:var(--text);min-height:100vh}button,input{font:inherit}.shell{display:grid;grid-template-columns:320px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;border-right:1px solid rgba(255,255,255,.08);background:rgba(3,13,24,.86);backdrop-filter:blur(18px);padding:24px;overflow:auto}.brand{display:flex;gap:14px;align-items:center;margin-bottom:22px}.logo{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;color:#04101c;font-weight:900;box-shadow:var(--shadow)}.brand b{display:block;font-size:14px}.brand span{color:var(--muted);font-size:12px}.progress{background:#0a2137;border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:16px;margin:12px 0 18px}.bar{height:9px;background:#071523;border-radius:99px;overflow:hidden}.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--ok));width:0}.search{width:100%;padding:12px 14px;border-radius:14px;border:1px solid rgba(255,255,255,.1);background:#071523;color:var(--text);outline:none}.module{margin-top:14px}.module>button{width:100%;background:none;border:0;color:var(--text);text-align:left;padding:11px 8px;font-weight:800;cursor:pointer}.lesson-link{display:flex;align-items:center;gap:10px;width:100%;border:0;background:transparent;color:var(--muted);text-align:left;padding:10px 8px;border-radius:12px;cursor:pointer}.lesson-link:hover,.lesson-link.active{background:#102943;color:var(--text)}.dot{width:9px;height:9px;border:1px solid var(--brand);border-radius:99px;flex:none}.lesson-link.done .dot{background:var(--ok);border-color:var(--ok)}.main{padding:36px clamp(22px,4vw,70px) 80px;max-width:1280px;width:100%}.hero{padding:34px;border:1px solid rgba(255,255,255,.1);border-radius:28px;background:linear-gradient(135deg,rgba(21,58,95,.75),rgba(11,28,47,.72));box-shadow:var(--shadow);margin-bottom:24px;overflow:hidden;position:relative}.hero:after{content:'';position:absolute;width:240px;height:240px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--accent));filter:blur(80px);opacity:.18;right:-60px;top:-80px}.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand);font-weight:900}.hero h1{font-size:clamp(32px,5vw,60px);line-height:1.02;margin:12px 0}.hero p{color:var(--muted);max-width:820px;font-size:18px;line-height:1.65}.stats{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.stat{padding:11px 15px;border-radius:14px;background:rgba(0,0,0,.18);border:1px solid rgba(255,255,255,.08)}.stat b{color:var(--brand)}.lesson-card{background:rgba(11,28,47,.9);border:1px solid rgba(255,255,255,.09);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.lesson-card h2{font-size:clamp(28px,4vw,44px);margin:10px 0}.objective{font-size:17px;color:#c9dff1;padding:16px 18px;border-left:4px solid var(--brand);background:#0b2238;border-radius:0 14px 14px 0}.grid2{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;margin-top:20px}.panel{background:#081a2b;border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:20px}.panel h3{margin-top:0}.diagram{min-height:220px;display:grid;place-items:center;background:radial-gradient(circle at center,rgba(98,208,255,.11),transparent 60%);border-radius:16px;padding:18px}.flow{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px}.flow .node{padding:12px 15px;border-radius:14px;background:#123252;border:1px solid #2e648d;font-weight:800}.arrow{color:var(--brand);font-weight:900}.code{background:#020a11;border:1px solid #17334d;border-radius:16px;padding:18px;overflow:auto;color:#d7f1ff;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.btn{border:0;padding:12px 16px;border-radius:13px;font-weight:900;cursor:pointer}.primary{background:linear-gradient(135deg,var(--brand),#75f1d2);color:#04111c}.secondary{background:#13314f;color:var(--text);border:1px solid #254b70}.ghost{background:transparent;color:var(--muted);border:1px solid rgba(255,255,255,.12)}.terms{display:flex;flex-wrap:wrap;gap:8px}.term{padding:7px 10px;border-radius:999px;background:#132f4a;color:#bfe8ff;font-size:13px}.quiz-option{display:block;width:100%;text-align:left;margin:9px 0;padding:13px;border-radius:13px;border:1px solid #254560;background:#0c243a;color:var(--text);cursor:pointer}.quiz-option.correct{border-color:var(--ok);background:rgba(79,226,160,.12)}.quiz-option.wrong{border-color:#ff7a7a;background:rgba(255,90,90,.12)}.video-modal{position:fixed;inset:0;background:rgba(0,0,0,.84);display:grid;place-items:center;padding:20px;z-index:50}.video-box{width:min(900px,96vw);background:#071827;border:1px solid #234a6c;border-radius:28px;padding:28px;box-shadow:var(--shadow)}.video-stage{min-height:320px;display:grid;place-items:center;text-align:center;padding:36px;border-radius:20px;background:radial-gradient(circle at 50% 30%,#173f66,#081827 60%)}.video-stage h3{font-size:34px;margin:0 0 14px}.video-stage p{font-size:20px;color:#c8dcee;line-height:1.6}.video-controls{display:flex;justify-content:space-between;gap:10px;margin-top:15px}.notice{color:var(--muted);font-size:13px}.toast{position:fixed;right:20px;bottom:20px;background:#0d2b45;border:1px solid #2d658f;border-radius:14px;padding:13px 16px;box-shadow:var(--shadow);z-index:70}.mobile-top{display:none}.hidden{display:none!important}@media(max-width:900px){.shell{grid-template-columns:1fr}.sidebar{position:fixed;z-index:40;left:0;top:0;width:min(88vw,360px);transform:translateX(-105%);transition:.25s}.sidebar.open{transform:translateX(0)}.mobile-top{display:flex;position:sticky;top:0;z-index:30;padding:12px 16px;background:rgba(3,13,24,.9);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.08);justify-content:space-between}.mobile-top button{background:#12314e;border:0;color:#fff;border-radius:12px;padding:10px 12px}.main{padding:22px 16px 60px}.grid2{grid-template-columns:1fr}.hero{padding:24px}.lesson-card{padding:20px}}
