:root{--bg:#0b0d12;--panel:#141821;--line:#232a36;--text:#e7ecf3;--muted:#8a93a3;--brand:#1f6feb}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}a{color:inherit;text-decoration:none}.muted{color:var(--muted)}.topbar{display:flex;align-items:center;padding:14px 20px;border-bottom:1px solid var(--line)}.brand{font-weight:700;letter-spacing:.2px}.container{max-width:1000px;margin:0 auto;padding:28px 20px 64px}h1{font-size:24px;margin:4px 0 18px}h2{font-size:18px;margin:26px 0 10px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));grid-gap:14px;gap:14px}.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 18px;transition:border-color .15s}.card:hover{border-color:var(--brand)}.card h3{margin:0 0 6px;font-size:16px}.lessonlist{list-style:none;margin:0;padding:0}.lessonrow{display:flex;align-items:center;gap:10px;padding:11px 14px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:var(--panel)}.lessonrow:hover{border-color:var(--brand)}.pill{font-size:11px;padding:2px 8px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}.pill.free{color:#7ee2a8;border-color:#2c5}.player{aspect-ratio:16/9;width:100%;border:0;border-radius:12px;background:#000}.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:8px;padding:9px 16px;font-size:14px;cursor:pointer}.btn[disabled]{opacity:.55;cursor:default}.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}.back{font-size:13px}.back,.note{color:var(--muted)}.note{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 16px}