:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: rgba(15, 23, 42, 0.72);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --border: rgba(148, 163, 184, 0.35);
  --accent: #38bdf8;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 32rem),
    linear-gradient(135deg, #020617, var(--bg));
  color: var(--text);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.card {
  width: min(100%, 34rem);
  padding: 3rem 2rem;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: var(--card);
  box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
}

.mark {
  display: inline-grid;
  place-items: center;
  width: 4.5rem;
  height: 4.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(56, 189, 248, 0.55);
  border-radius: 1.2rem;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

.status {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.25rem);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #e0f2fe;
    --card: rgba(255, 255, 255, 0.78);
    --text: #0f172a;
    --muted: #475569;
    --border: rgba(15, 23, 42, 0.12);
  }

  body {
    background:
      radial-gradient(circle at top left, rgba(56, 189, 248, 0.3), transparent 32rem),
      linear-gradient(135deg, #f8fafc, var(--bg));
  }
}