:root{--bg-dark:#0f0f12;--bg-card:#1a1a20;--bg-input:#25252d;--border:#2d2d38;--text:#e4e4e7;--text-muted:#a1a1aa;--accent:#6366f1;--accent-hover:#818cf8;--success:#22c55e;--error:#ef4444;--font-mono:"JetBrains Mono","Fira Code","Consolas",monospace}*{box-sizing:border-box}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-dark);color:var(--text);line-height:1.6;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.markdown-content h1{font-size:1.75rem;margin:1.5rem 0 1rem;padding-bottom:.5rem;border-bottom:1px solid var(--border)}.markdown-content h2{font-size:1.35rem;margin:1.25rem 0 .75rem}.markdown-content h3{font-size:1.15rem;margin:1rem 0 .5rem}.markdown-content p{margin:.75rem 0}.markdown-content pre{background:var(--bg-input);padding:1rem;border-radius:8px;overflow-x:auto;margin:1rem 0;border:1px solid var(--border)}.markdown-content code{font-family:var(--font-mono);font-size:.9em}.markdown-content pre code{background:none;padding:0}.markdown-content ol,.markdown-content ul{margin:.75rem 0;padding-left:1.5rem}.markdown-content blockquote{border-left:4px solid var(--accent);margin:1rem 0;padding:.5rem 1rem;background:var(--bg-card);border-radius:0 8px 8px 0}.topic-layout{display:grid;grid-template-columns:1.2fr 1fr;grid-gap:2rem;gap:2rem;align-items:start}@media (max-width:960px){.topic-layout{grid-template-columns:1fr}}.topic-header{grid-column:1/-1}.topic-readme{min-width:0}.topic-questions{position:-webkit-sticky;position:sticky;top:1.5rem}@media (max-width:960px){.topic-questions{position:static}}.study-card{background:var(--bg-card);border-radius:16px;border:1px solid var(--border);overflow:hidden}.study-card-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;background:rgba(255,255,255,.02);border-bottom:1px solid var(--border)}.study-card-body{padding:1.5rem}.btn-ghost{padding:.5rem .875rem;background:transparent;color:var(--text-muted);border:1px solid var(--border);border-radius:8px;cursor:pointer;font-size:.8125rem;font-weight:500;transition:color .15s,border-color .15s}.btn-ghost:hover{color:var(--text);border-color:var(--text-muted)}.btn-primary{padding:.5rem 1rem;background:var(--accent);color:white;border:none;border-radius:8px;font-weight:600;font-size:.8125rem;cursor:pointer;transition:background .15s,opacity .15s}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-success{background:var(--success)}.btn-success:hover:not(:disabled){background:#16a34a}.topic-questions .study-card-body::-webkit-scrollbar{width:6px}.topic-questions .study-card-body::-webkit-scrollbar-track{background:transparent}.topic-questions .study-card-body::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.topic-questions .study-card-body::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}aside nav a{transition:color .15s}aside nav a:hover{color:var(--accent)!important}