:root { --bg: #ffffff; --text: #111111; --muted: #6b7280; --card: #eceef2; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #121212; --text: #ffffff; --muted: #9ca3af; --card: #2a2b2f; }
}
[hidden] { display: none !important; }
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.card { width: min(92vw, 380px); text-align: center; padding: 32px 24px; }
.logo { width: 76px; height: auto; }
h1 { margin: 16px 0 4px; font-size: 30px; font-weight: 600; }
.tagline { margin: 0 0 28px; color: var(--muted); font-size: 14px; }
.msg { margin: 0 0 24px; font-size: 16px; }
.btn {
  display: block;
  margin: 10px 0;
  padding: 14px 20px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
}
.primary { color: #ffffff; background: linear-gradient(90deg, #0aa5ff, #0b45f5); }
.secondary { color: var(--text); background: var(--card); }
.note { color: var(--muted); font-size: 14px; }