:root{--ink:#101828;--muted:#667085;--line:#e4e7ec;--bg:#f8fafc;--card:#fff;--accent:#635bff;--accent2:#7c3aed;--success:#039855}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55}.wrap{width:min(1120px,92%);margin:auto}.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.nav{min-height:72px;display:flex;align-items:center;gap:22px;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:900;letter-spacing:-.03em}.brand small{display:block;font-size:9px;letter-spacing:.15em;color:var(--muted)}.logo{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;display:grid;place-items:center;font-weight:900}.nav nav{display:flex;gap:18px}.nav a{color:var(--ink);text-decoration:none;font-size:14px}.btn{display:inline-block;background:var(--accent);color:#fff!important;border:0;padding:11px 17px;border-radius:10px;text-decoration:none;font-weight:700;cursor:pointer}.btn.secondary{background:#101828}.btn.ghost{background:#fff!important;color:var(--ink)!important;border:1px solid var(--line)}.user-pill{font-size:13px;color:var(--muted);margin-right:8px}.hero{padding:72px 0 50px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}.eyebrow{display:inline-block;padding:7px 11px;border-radius:99px;background:#eef0ff;color:#4f46e5;font-size:12px;font-weight:800}.hero h1{font-size:clamp(42px,6vw,72px);line-height:1.02;letter-spacing:-.055em;margin:18px 0}.hero p{font-size:19px;color:var(--muted);max-width:680px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.hero-card,.card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:0 10px 30px rgba(16,24,40,.05)}.hero-card{padding:26px}.score{font-size:52px;font-weight:900;letter-spacing:-.05em}.meter{height:10px;background:#eaecf0;border-radius:99px;overflow:hidden}.meter span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:99px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{padding:22px}.section{padding:30px 0}.section h2{font-size:32px;letter-spacing:-.03em}.muted{color:var(--muted)}.tag{font-size:12px;font-weight:800;color:#475467;background:#f2f4f7;border-radius:99px;padding:5px 9px;display:inline-block}.form{max-width:520px;margin:45px auto}.form .card{padding:30px}.field{margin:16px 0}.field label{display:block;font-weight:700;font-size:14px;margin-bottom:7px}.field input,.field textarea,.field select{width:100%;padding:12px 13px;border:1px solid #d0d5dd;border-radius:10px;font:inherit;background:#fff}.field textarea{min-height:180px;resize:vertical}.notice{padding:14px 16px;border-radius:10px;background:#ecfdf3;color:#027a48;margin:15px 0}.error{padding:14px 16px;border-radius:10px;background:#fef3f2;color:#b42318;margin:15px 0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{padding:18px;background:#fff;border:1px solid var(--line);border-radius:16px}.stat b{font-size:28px}.lesson{margin:20px 0}.lesson h3{margin-top:0}.quiz{border-top:1px solid var(--line);padding-top:18px;margin-top:18px}.question{margin:18px 0}.question label{display:block;margin:8px 0;padding:10px;border:1px solid var(--line);border-radius:10px}.chat{height:480px;display:flex;flex-direction:column}.messages{flex:1;overflow:auto;padding:15px;background:#f9fafb;border-radius:14px}.msg{max-width:82%;padding:11px 14px;border-radius:14px;margin:9px 0;white-space:pre-wrap}.msg.user{margin-left:auto;background:#e9e7ff}.msg.ai{background:#fff;border:1px solid var(--line)}.chat-form{display:flex;gap:8px;margin-top:10px}.chat-form input{flex:1;padding:12px;border:1px solid var(--line);border-radius:10px}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse;background:#fff}.table th,.table td{padding:12px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}footer{margin-top:70px;padding:28px 0;border-top:1px solid var(--line);color:var(--muted)}footer .wrap{display:flex;justify-content:space-between}@media(max-width:850px){.hero{grid-template-columns:1fr}.grid{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.nav nav{display:none}.nav{gap:8px}.user-pill{display:none}}@media(max-width:500px){.stats{grid-template-columns:1fr}.hero{padding-top:40px}.hero h1{font-size:44px}}