/* Default / unset → dark (night). Light only when explicitly requested. */
:root,
[data-theme='dark'] {
  --bg: #0b1220;
  --surface: #111827;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --link: #93c5fd;
  --accent: #60a5fa;
  --border: #1f2937;
  --danger: #fca5a5;
}

[data-theme='light'] {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --link: #1d4ed8;
  --accent: #2563eb;
  --border: #e5e7eb;
  --danger: #b91c1c;
}