:root {
  --navy: #101b2d;
  --emerald: #10b981;
  --mint: #6ee7b7;
  --ice: #f8fafc;
  --text: #101b2d;
  --muted: #475569;
  --card: #ffffff;
  --border: #e2e8f0;
  --bg: #f8fafc;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f8fafc;
    --muted: #b6c2d3;
    --card: #1e293b;
    --border: #334155;
    --bg: #101b2d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.6 -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    Inter,
    Roboto,
    sans-serif;
}

main {
  width: 100%;
  max-width: 440px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.3px;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px 24px;
  text-align: center;
}

.icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald);
  font-size: 28px;
  font-weight: 700;
}

.icon.error {
  background: rgba(200, 30, 30, 0.12);
  color: #c81e1e;
}

h1 {
  font-size: 22px;
  margin: 0 0 8px;
}

p {
  margin: 0 0 16px;
  color: var(--muted);
}

.button {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--emerald);
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
  margin-top: 8px;
}

.button:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

.hint {
  font-size: 14px;
  margin-top: 16px;
}

footer {
  margin-top: 20px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}