:root {
    --bg: #ffffff;
    --fg: #111111;
    --muted: #666;
    --link: #1a73e8;
    --sidebar: #f4f5f7;
    --border: #ddd;
}

@media (prefers-color-scheme: dark) {
    :root {
      --bg: #0f1115;
      --fg: #f1f3f7;
      --muted: #b3b8c3;
      --link: #8ab4f8;
      --sidebar: #1c1f27;
      --border: #2a2f3a;
    }
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, sans-serif;
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 220px;
    background: var(--sidebar);
    border-right: 1px solid var(--border);
    padding: 20px 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.sidebar h2 {
    font-size: 16px;
    margin: 0 0 10px 10px;
    color: var(--muted);
}
.tab {
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    border: none;
    background: none;
    text-align: left;
    font-size: 15px;
    color: var(--fg);
}
.tab:hover {
    background: rgba(0,0,0,0.05);
}
.tab[aria-selected="true"] {
    background: var(--link);
    color: white;
}

/* Content area */
.content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}
.panel {
    display: block;
}
h1, h2 {
    margin-top: 0;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 24px; }
.hero { display:grid; grid-template-columns: 120px 1fr; gap: 24px; align-items:center; }
.avatar {
    width:120px; height:120px; border-radius:50%; object-fit:cover; background:#ddd; border:1px solid var(--border);
}
h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 6px; line-height:1.2; }
.title { color: var(--muted); margin: 0 0 12px; }
.links { display:flex; flex-wrap:wrap; gap:12px; }
.badge {
  display:inline-block; padding:6px 10px; background:var(--card); border:1px solid var(--border);
  border-radius:999px; font-size:14px;
}
.muted { color: var(--muted); }