:root{
  --bg:#f7f4ef; --card:#ffffff; --text:#222; --muted:#666;
  --primary:#5b3a29; --secondary:#8d6e63; --accent:#d7c2a3;
  --border:#e8dfd2; --shadow:0 10px 28px rgba(0,0,0,.08);
  --radius:18px;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,"Heebo","Assistant",sans-serif;background:linear-gradient(180deg,#fbf8f3 0%,#f2ece3 100%);color:var(--text);line-height:1.75}
a{text-decoration:none;color:inherit}
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.topbar-inner{max-width:1100px;margin:0 auto;padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.logo{font-size:1.1rem;font-weight:800;color:var(--primary)}
.menu{display:flex;gap:10px;flex-wrap:wrap}
.menu a{border:1px solid var(--border);background:#fff;padding:10px 14px;border-radius:999px;font-size:.95rem;color:var(--primary)}
.container{max-width:1100px;margin:0 auto;padding:20px 18px 34px}
.hero{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.hero h1{margin:0 0 10px;color:var(--primary);line-height:1.25}
.hero p{margin:0 0 10px}
.grid{display:grid;grid-template-columns:1fr 320px;gap:18px;margin-top:18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.card h2,.card h3{margin-top:0;color:var(--primary)}
.lesson-list{display:grid;gap:10px}
.lesson-link{display:block;padding:12px 14px;border:1px solid var(--border);border-radius:14px;background:#fff}
.lesson-link:hover{border-color:#d5c2aa;transform:translateY(-1px)}
.small{color:var(--muted);font-size:.92rem}
.pill{display:inline-block;background:#f6efe6;border:1px solid var(--border);padding:7px 10px;border-radius:999px;color:var(--primary);font-size:.9rem}
.section{background:#faf7f2;border:1px solid #eee2d1;border-radius:16px;padding:16px;margin:14px 0}
.section h3{margin:0 0 8px;color:var(--primary);font-size:1.05rem}
.section ul{padding-right:20px;margin:8px 0}
.section li{margin-bottom:6px}
.note{border-right:4px solid var(--accent);padding:12px 14px;background:#fffaf3;border-radius:12px;margin:14px 0}
.kv{display:grid;gap:10px}
.term{border:1px solid var(--border);border-radius:14px;background:#fff;padding:12px}
.term b{color:var(--primary)}
.term .meta{color:var(--muted);font-size:.92rem;margin-top:6px}
.qa{border:1px solid var(--border);border-radius:14px;background:#fff;padding:12px;margin:10px 0}
.footer{color:var(--muted);font-size:.92rem;margin-top:18px}
.navrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.btn{display:inline-block;padding:12px 16px;border-radius:12px;border:1px solid var(--border);background:#fff;color:var(--primary)}
.btn.primary{background:var(--primary);color:#fff;border-color:transparent}
@media (max-width: 920px){.grid{grid-template-columns:1fr}}