*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f5f4f0;
  --surface: #ffffff;
  --border: rgba(0,0,0,0.1);
  --text: #1a1a1a;
  --text-secondary: #666;
}
body { background: var(--bg); font-family: system-ui, sans-serif; color: var(--text); }
.hub { max-width: 960px; margin: 0 auto; padding: 1.5rem; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 0.5px solid var(--border); }
.topbar-title { font-size: 18px; font-weight: 500; }
.topbar-date { font-size: 13px; color: var(--text-secondary); }