:root {
  --bg: #f7fbff;
  --card: #ffffff;
  --accent: #0b76ef;
  --muted: #6b7280;
}
*{box-sizing:border-box}
html,body{height:100%}
body {
  margin: 0;
  font-family: 'Lato', system-ui, -apple-system, "Segoe UI", Roboto, Arial;
  background: var(--bg);
  color: #0f172a;
}
.container {
  max-width: 900px;
  margin: 3rem auto;
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 6px 24px rgba(15,23,42,0.06);
}
header{display:flex;align-items:center;gap:1rem}
header h1{font-size:1.4rem;margin:0}
.content{margin-top:1rem}
.images img{margin-right:0.5rem;margin-top:0.5rem;vertical-align:middle}
.controls{margin-top:1rem}
button {
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 0;
  cursor: pointer;
  margin-right: 0.5rem;
}
footer{margin-top:1.5rem;color:var(--muted)}
/* fallback page styles (used by fallback.html) */
.offline-shell {
  text-align: center;
  padding: 2rem;
}
.offline-shell h2 { margin-top: 0.5rem; font-size: 1.6rem; }
.offline-shell p { color: var(--muted); margin: 1rem 0 1.45rem; }
.offline-shell button { font-size: 1rem; padding: 0.6rem 1.1rem; }