:root {
  --bg: #0E0E10;
  --surface: #17171b;
  --accent: #0E7C86;
  --text: #f4f4f5;
  --muted: #a1a1aa;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100%;
}
.pwa-container { max-width: 640px; margin: 0 auto; padding: 24px; }
.pwa-offline-banner { display: none; background: var(--accent); color: #fff; text-align: center; padding: 8px; }
.is-offline .pwa-offline-banner { display: block; }
#pwa-install {
  background: var(--accent); color: #fff; border: 0; border-radius: 8px;
  padding: 12px 20px; font-size: 16px; cursor: pointer;
}
.offline-card { background: var(--surface); border-radius: 12px; padding: 32px; text-align: center; margin-top: 15vh; }
.offline-card h1 { font-size: 22px; margin: 0 0 8px; }
.offline-card p { color: var(--muted); margin: 0; }