:root{--color-bg: #ffffff;--color-surface: #f8fafc;--color-border: #e2e8f0;--color-text: #0f172a;--color-muted: #475569;--color-accent: #0369a1;--color-accent-strong: #075985;--color-accent-contrast: #ffffff;--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;--maxw: 72rem;--maxw-prose: 44rem;--radius: .5rem;--space: 1rem}*{box-sizing:border-box}html{font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);line-height:1.6;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;display:flex;flex-direction:column;min-height:100vh}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2;color:var(--color-text)}img{max-width:100%;height:auto}.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:1.25rem}.prose{max-width:var(--maxw-prose)}.prose h2{margin-top:2rem}.prose p,.prose ul,.prose ol{font-size:1.0625rem}main{flex:1 0 auto;padding-block:2.5rem 4rem}.skip-link{position:absolute;left:-9999px;top:0;background:var(--color-accent);color:var(--color-accent-contrast);padding:.5rem 1rem;z-index:100}.skip-link:focus{left:0}.btn{display:inline-block;padding:.7rem 1.25rem;border-radius:var(--radius);font-weight:600;border:1px solid transparent;cursor:pointer}.btn-primary{background:var(--color-accent);color:var(--color-accent-contrast)}.btn-primary:hover{background:var(--color-accent-strong);text-decoration:none}.btn-secondary{background:transparent;border-color:var(--color-border);color:var(--color-text)}.btn-secondary:hover{border-color:var(--color-accent);text-decoration:none}.site-header{border-bottom:1px solid var(--color-border);background:var(--color-bg)}.nav{display:flex;align-items:center;gap:1.5rem;padding-block:.9rem}.nav-brand{font-weight:700;font-size:1.1rem;color:var(--color-text);display:inline-flex;align-items:center;gap:.5rem}.nav-links{display:flex;gap:1.25rem;margin-left:auto;align-items:center}.nav-links a{color:var(--color-muted);font-weight:500}.nav-links a[aria-current=page]{color:var(--color-text)}.site-footer{flex-shrink:0;border-top:1px solid var(--color-border);background:var(--color-surface);padding-block:2rem;color:var(--color-muted);font-size:.9rem}.site-footer .footer-grid{display:flex;flex-wrap:wrap;gap:1.5rem;justify-content:space-between}.grid{display:grid;gap:1.25rem}.grid-2{grid-template-columns:repeat(auto-fit,minmax(18rem,1fr))}.card{border:1px solid var(--color-border);border-radius:var(--radius);padding:1.25rem;background:var(--color-bg)}.card h3{margin-top:0}.muted{color:var(--color-muted)}.kicker{text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;font-weight:700;color:var(--color-accent)}.hero{padding-block:2rem 1rem}.hero h1{font-size:clamp(1.9rem,4vw,2.8rem);margin:.5rem 0}.hero p{font-size:1.15rem;color:var(--color-muted);max-width:40rem}.hero-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.25rem}.lang-switcher a{font-weight:600;color:var(--color-accent)}.breadcrumb{font-size:.85rem;color:var(--color-muted);margin-bottom:1rem}.breadcrumb a{color:var(--color-muted)}.lesson-nav{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--color-border)}.lesson-nav a{max-width:48%}.module{border:1px solid var(--color-border);border-radius:var(--radius);padding:1.25rem 1.5rem;margin-bottom:1.25rem}.module h2{margin-top:0;font-size:1.25rem}.lesson-list{list-style:none;padding:0;margin:.5rem 0 0}.lesson-list li{padding:.35rem 0;border-top:1px solid var(--color-border)}.tags{display:flex;gap:.5rem;flex-wrap:wrap;list-style:none;padding:0}.tags li{background:var(--color-surface);border:1px solid var(--color-border);border-radius:999px;padding:.15rem .7rem;font-size:.8rem;color:var(--color-muted)}.waitlist{margin-top:3rem;padding:1.5rem;border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface)}.waitlist h2{margin-top:0}.splash{min-height:100vh;display:grid;place-items:center;text-align:center;padding:2rem}.splash .choices{display:flex;gap:1rem;justify-content:center;margin-top:1.5rem;flex-wrap:wrap}