:root {
  --ppt-primary:#0ea5e9;
  --ppt-text:#0f172a;
  --ppt-muted:#64748b;
}
body { color: var(--ppt-text); background: #fff; }
.container { max-width: 1080px; margin: 0 auto; padding: 1rem; }
.site-header, .site-footer { border-block: 1px solid #e5e7eb; }
.brand { color: var(--ppt-text); text-decoration: none; font-weight: 600; }
.ppt-app { min-height: 200px; border: 1px dashed #cbd5e1; padding: 1rem; margin-block: 1rem; }
.notice { color: var(--ppt-muted); }