@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap");.light,:root{color-scheme:light;--bg:#f7f9fc;--text:#0f172a;--muted:#475569;--muted-strong:#1f2937;--card:#fff;--border:#e2e8f0;--border-strong:#cbd5e1;--pill-bg:rgba(15,23,42,.04);--pill-border:rgba(15,23,42,.08);--button-text:#f8fafc;--button-bg:linear-gradient(135deg,#22d3ee,#6366f1);--button-border:#cbd5e1;--surface-strong:rgba(15,23,42,.04);--accent-1:rgba(99,102,241,.08);--accent-2:rgba(14,165,233,.1);--input-bg:#fff;--input-border:#cbd5e1;--backdrop-blur:6px;--card-shadow:0 10px 30px rgba(15,23,42,.08);--button-shadow:0 10px 24px rgba(79,70,229,.25);--input-shadow:0 6px 16px rgba(15,23,42,.04)}.dark{color-scheme:dark;--bg:#0b1220;--text:#e5e7eb;--muted:#9ca3af;--muted-strong:#cbd5e1;--card:#101827;--border:#1f2937;--border-strong:#334155;--pill-bg:hsla(0,0%,100%,.06);--pill-border:hsla(0,0%,100%,.08);--button-text:#0b1220;--button-bg:linear-gradient(135deg,#22d3ee,#6366f1);--button-border:hsla(0,0%,100%,.12);--surface-strong:hsla(0,0%,100%,.03);--accent-1:rgba(99,102,241,.12);--accent-2:rgba(14,165,233,.15);--input-bg:hsla(0,0%,100%,.04);--input-border:#1f2937;--backdrop-blur:6px;--card-shadow:0 12px 32px rgba(0,0,0,.45);--button-shadow:0 12px 28px rgba(0,0,0,.35);--input-shadow:0 8px 20px rgba(0,0,0,.25)}*{box-sizing:border-box}body{margin:0;font-family:Space Grotesk,system-ui,-apple-system,sans-serif;background:radial-gradient(circle at 20% 20%,var(--accent-1),transparent 25%),radial-gradient(circle at 80% 0,var(--accent-2),transparent 30%),var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:32px 20px 80px}.grid{display:grid;grid-gap:16px;gap:16px}.card{background:linear-gradient(180deg,hsla(0,0%,100%,.02),hsla(0,0%,100%,.01)),var(--card);border-radius:16px;padding:20px;-webkit-backdrop-filter:blur(var(--backdrop-blur));backdrop-filter:blur(var(--backdrop-blur));box-shadow:var(--card-shadow)}.pill{padding:6px 12px;border-radius:999px;background:var(--pill-bg);color:var(--muted);font-size:13px}.button,.pill{display:inline-flex;align-items:center;gap:8px}.button{justify-content:center;padding:12px 18px;border-radius:12px;border:none;color:var(--button-text);background:var(--button-bg);font-weight:600;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease;box-shadow:var(--button-shadow)}.button.secondary{background:transparent;color:var(--text);border-color:var(--border)}.button:hover{transform:translateY(-1px);box-shadow:0 10px 30px rgba(79,70,229,.25)}input,select,textarea{width:100%;padding:12px 14px;border-radius:12px;border:none;background:var(--input-bg);color:var(--text);font-size:15px;box-shadow:var(--input-shadow)}label span{color:var(--muted);font-size:14px}.navbar{position:-webkit-sticky;position:sticky;top:0;z-index:30;background:linear-gradient(135deg,rgba(34,211,238,.04),rgba(99,102,241,.05)),var(--card);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(var(--backdrop-blur));backdrop-filter:blur(var(--backdrop-blur));box-shadow:0 8px 24px rgba(15,23,42,.08)}.navbar__content{max-width:1100px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px}.navbar__brand{display:inline-flex;align-items:center;gap:12px;font-weight:700;color:var(--text)}.navbar__logo{position:relative;width:95px;height:44px;overflow:hidden}.navbar__brand-text{display:grid;line-height:1.2}.navbar__brand-text span{font-size:15px}.navbar__brand-text small{color:var(--muted);font-size:13px}.navbar__links{display:flex;align-items:center;gap:8px;font-weight:600}.navbar__link{padding:10px 12px;border-radius:12px;color:var(--muted-strong);border:1px solid transparent;transition:background .15s ease,color .15s ease,border-color .15s ease}.navbar__link--active,.navbar__link:hover{color:var(--text);background:var(--pill-bg);border-color:var(--border)}.navbar__link--active{box-shadow:0 8px 18px rgba(15,23,42,.08)}.navbar__actions{display:inline-flex;align-items:center;gap:10px}.navbar__menu-button{display:none;align-items:center;justify-content:center;gap:8px;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;box-shadow:var(--card-shadow);transition:transform .15s ease,box-shadow .15s ease}.navbar__menu-button:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(79,70,229,.18)}.navbar__menu-icon,.navbar__menu-icon:after,.navbar__menu-icon:before{display:block;width:18px;height:2px;background:currentColor;border-radius:999px;transition:transform .15s ease,opacity .15s ease;content:""}.navbar__menu-icon:before{transform:translateY(-6px)}.navbar__menu-icon:after{transform:translateY(6px)}.navbar__menu-button.is-open .navbar__menu-icon{transform:rotate(45deg)}.navbar__menu-button.is-open .navbar__menu-icon:before{transform:rotate(-90deg)}.navbar__menu-button.is-open .navbar__menu-icon:after{opacity:0}.navbar__mobile{display:none}.layout-topbar{position:-webkit-sticky;position:sticky;top:0;z-index:10;display:flex;justify-content:flex-end;padding:12px 20px 0;-webkit-backdrop-filter:blur(var(--backdrop-blur));backdrop-filter:blur(var(--backdrop-blur))}.theme-toggle{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:12px;background:var(--card);color:var(--text);border:none;cursor:pointer;font-weight:600;box-shadow:0 4px 12px rgba(0,0,0,.05)}.theme-toggle:focus-visible{outline:2px solid #6366f1;outline-offset:2px}.markdown{color:var(--muted);line-height:1.6}.markdown h1,.markdown h2,.markdown h3,.markdown h4{color:var(--text);margin:0 0 8px}.markdown p{margin:0 0 12px}.markdown ol,.markdown ul{margin:0 0 12px 20px;padding:0}.markdown li{margin-bottom:6px}.markdown a{color:inherit;text-decoration:underline}.course-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(280px,340px))}@media (min-width:768px){.course-grid{gap:20px;grid-template-columns:repeat(auto-fit,minmax(300px,380px))}}.course-card{position:relative;display:grid;grid-template-rows:auto 1fr;grid-gap:12px;gap:12px;border:1px solid var(--border);border-radius:18px;padding:14px;box-shadow:var(--card-shadow);transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.course-card:focus-within,.course-card:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(79,70,229,.16)}.course-card--pinned{border-width:2px}.course-card__media{min-height:140px}.course-card__hero{position:relative;width:100%;padding-top:62%;border-radius:14px;overflow:hidden;border:1px solid var(--border);box-shadow:var(--card-shadow)}.course-card__icon{width:64px;height:64px;display:inline-flex;align-items:center;justify-content:center;border-radius:16px;border:1px solid var(--border)}.course-card__placeholder{width:100%;height:140px;border-radius:14px;filter:saturate(1.1);box-shadow:var(--card-shadow)}.course-card__content{display:grid;grid-gap:8px;gap:8px}.course-card__title{margin:0}.course-card__subtitle{margin:0;color:var(--muted);line-height:1.5}.course-card__meta{margin:0;color:var(--muted);font-size:14px}.course-card__actions{margin-top:6px;display:flex;gap:8px;flex-wrap:wrap}.course-card__cta{width:100%}.cta-fixed{position:fixed;right:16px;bottom:16px;display:flex;gap:8px;flex-wrap:wrap;z-index:20}@media (max-width:640px){.cta-fixed{left:16px;right:16px;justify-content:center}}@media (max-width:900px){.navbar__content{padding:12px 16px}.navbar__links{display:none}.navbar__menu-button{display:inline-flex}.navbar__mobile{display:none}.navbar__mobile.is-open{display:block;border-top:1px solid var(--border);background:var(--card);box-shadow:0 16px 30px rgba(15,23,42,.12)}.navbar__mobile nav{display:grid;grid-gap:10px;gap:10px;padding:12px 16px 16px}.navbar__mobile .navbar__link{width:100%;background:var(--pill-bg);border-color:var(--border);color:var(--text)}}