:root{--blue:#0b5cff;--dark:#111827;--muted:#6b7280;--bg:#f5f7fb;--card:#fff;--border:#e5e7eb}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--dark);line-height:1.5}.topbar{display:flex;justify-content:space-between;align-items:center;padding:18px 6vw;background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:2}.brand{font-weight:800;color:var(--blue);text-decoration:none;font-size:20px}nav{display:flex;gap:14px;align-items:center;flex-wrap:wrap}nav a{color:var(--dark);text-decoration:none}.container{max-width:1120px;margin:0 auto;padding:32px 20px}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:center}.card,.hero-box{background:var(--card);border:1px solid var(--border);border-radius:22px;padding:24px;box-shadow:0 8px 24px rgba(0,0,0,.04)}h1{font-size:42px;line-height:1.05;margin:0 0 14px}h2{margin-top:0}.muted{color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}.btn,button{display:inline-block;background:var(--blue);color:white!important;border:0;border-radius:12px;padding:11px 16px;text-decoration:none;font-weight:700;cursor:pointer}.btn.secondary{background:#111827}.btn.ghost{background:#eef2ff;color:#1e40af!important}.small{padding:8px 12px}.badge{display:inline-block;padding:5px 9px;border-radius:999px;background:#eef2ff;color:#1e40af;font-size:12px;font-weight:700}.course-card{display:flex;flex-direction:column;gap:8px}.lesson-section{margin:18px 0;padding:18px;border-left:4px solid var(--blue);background:white;border-radius:12px}.word{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;padding:10px;border-bottom:1px solid var(--border)}.dialogue p{margin:8px 0}.form{max-width:560px}.form input,.form select,.form textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:12px;margin:6px 0 14px;background:white}.alert{padding:14px;border-radius:12px;margin-bottom:18px;background:#e0f2fe}.alert.error{background:#fee2e2}.progressbar{height:12px;background:#e5e7eb;border-radius:99px;overflow:hidden}.progressbar span{display:block;height:100%;background:var(--blue)}table{width:100%;border-collapse:collapse;background:white;border-radius:14px;overflow:hidden}td,th{padding:12px;border-bottom:1px solid var(--border);text-align:left}.footer{text-align:center;color:var(--muted);padding:32px}@media(max-width:760px){.hero{grid-template-columns:1fr}.topbar{align-items:flex-start;gap:12px;flex-direction:column}h1{font-size:32px}.word{grid-template-columns:1fr}}