@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap");:root{--blue:#007190;--violet:#20CEE0;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f8fafc;--card:#fff;--green:#16a34a;--amber:#f59e0b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Manrope,Arial,sans-serif;font-size:14px}a{text-decoration:none;color:inherit}button,input{font:inherit}.shell{display:grid;grid-template-columns:248px 1fr;min-height:100vh}.sidebar{background:#fff;border-right:1px solid var(--line);padding:24px 14px;position:-webkit-sticky;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;padding:0 10px 32px}.brand-mark{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--violet));color:#fff;display:grid;place-items:center}.nav-label{font-size:10px;font-weight:800;letter-spacing:.1em;color:#94a3b8;padding:0 10px 8px}.nav 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.lesson-item.active{background:#eff6ff;color:var(--blue)}.video{aspect-ratio:16/7;background:linear-gradient(135deg,#0f172a,#334155);border-radius:16px;display:grid;place-items:center;color:#fff}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-top:24px}.tabs button{border:0;background:transparent;padding:12px 2px;font-weight:800;color:#64748b;border-bottom:2px solid transparent;cursor:pointer}.tabs button.active{color:var(--blue);border-color:var(--blue)}@media(max-width:900px){.shell{grid-template-columns:1fr}.sidebar{display:none}.page{padding:24px 18px}.topbar{padding:0 18px}.stats{grid-template-columns:repeat(2,1fr)}.hero-inner,.two{grid-template-columns:1fr}.course-list{grid-template-columns:repeat(2,1fr)}.hero-inner{margin-top:45px}.landing-nav 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