:root{--bg:#fff;--text:#0f172a;--muted:#475569;--primary:#0ea5a7;--accent:#ef4444;--card:#f8fafc;--ring:rgba(14,165,167,.35)}
@media (prefers-color-scheme: dark){:root{--bg:#0b1020;--text:#e5e7eb;--muted:#94a3b8;--card:#0f172a}}
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial}
.container{max-width:1200px;margin:0 auto;padding:0 1.25rem}
.header{position:sticky;top:0;z-index:50;background:color-mix(in oklab,var(--bg) 85%,transparent);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid color-mix(in oklab,var(--text) 12%,transparent)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:.85rem 0;gap:1rem}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:inherit}
.brand-logo{width:36px;height:36px;border-radius:8px;display:grid;place-items:center;color:#fff;font-weight:800;background:radial-gradient(120% 120% at 20% 20%,var(--accent),var(--primary));box-shadow:0 6px 16px -6px var(--ring)}
.menu{display:flex;gap:1rem;flex-wrap:wrap;align-items:center}
.menu a{color:inherit;text-decoration:none;padding:.45rem .7rem;border-radius:.6rem}
.menu a:hover,.menu a.active{background:var(--card)}
.cta{background:var(--primary);color:#fff;border:none;border-radius:.7rem;padding:.6rem .9rem;font-weight:700;box-shadow:0 8px 24px -8px var(--ring);cursor:pointer}
.section{padding:2.25rem 0}
.grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:900px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid color-mix(in oklab,var(--text) 12%,transparent);border-radius:1rem;padding:1rem}
.h{font-weight:800}.small{font-size:.92rem}.muted{color:var(--muted)}
.badge{display:inline-flex;align-items:center;gap:.4rem;font-size:.8rem;padding:.3rem .55rem;border:1px solid color-mix(in oklab,var(--text) 18%,transparent);border-radius:.6rem}
.note{padding:.75rem .9rem;border-left:4px solid var(--primary);background:color-mix(in oklab,var(--primary) 8%,var(--bg));border-radius:.35rem}
.footer{padding:2rem 0;border-top:1px solid color-mix(in oklab,var(--text) 12%,transparent);color:var(--muted)}
.table{width:100%;border-collapse:collapse;border:1px solid color-mix(in oklab,var(--text) 12%,transparent);border-radius:.6rem;overflow:hidden}
.table th,.table td{padding:.6rem .7rem;border-bottom:1px solid color-mix(in oklab,var(--text) 12%,transparent);text-align:left}
.table th{background:var(--card);font-weight:700}
.hero{padding:3rem 0 2rem;display:grid;grid-template-columns:1.2fr 1fr;gap:2rem;align-items:center}
.hero h1{font-size:clamp(1.9rem,3.2vw,3rem);line-height:1.2;margin:.25rem 0 .7rem}
.hero-visual{aspect-ratio:4/3;border-radius:1rem;border:1px solid color-mix(in oklab,var(--text) 12%,transparent);background:radial-gradient(120% 120% at 10% 10%,color-mix(in oklab,var(--accent) 60%,var(--primary) 40%),var(--primary))}
.controls{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.kbd{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.82rem;padding:.15rem .35rem;border-radius:.35rem;background:color-mix(in oklab,var(--text) 6%,var(--bg));border:1px solid color-mix(in oklab,var(--text) 16%,transparent)}
.vocab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem}
@media(max-width:760px){.vocab-grid{grid-template-columns:1fr}}
.vocab-item{display:flex;gap:.6rem;align-items:center;background:var(--bg);border:1px solid color-mix(in oklab,var(--text) 10%,transparent);border-radius:.7rem;padding:.5rem}
.vocab-item img{width:64px;height:64px;object-fit:cover;border-radius:.5rem;border:1px solid color-mix(in oklab,var(--text) 12%,transparent)}
.recorder{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
.recorder audio{max-width:220px}