:root {
  --bg: #ffffff;
  --text: #1f1f1f;
  --subtext: #555;
  --primary: #0a84ff;
  --font: 'Helvetica Neue', sans-serif;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1.5rem;
}

.card {
  padding: 2.5rem 2rem;
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
  max-width: 480px;
  width: 100%;
  background-color: #fff;
  border-width: 1px;
  border-style: solid;
  border-color: #e6e6e6;
}

.logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 0.8rem;
}

h1 {
  text-align: center;
  font-size: 1.75rem;
  margin: 0 0 1rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

p {
  color: var(--subtext);
  font-size: 1rem;
  line-height: 1.6;
  margin: 0.5rem 0;
}

.highlight {
  color: #0a84ff;
}

.sub {
  text-align: center;
  letter-spacing: 0.2rem;
}

.footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.8rem;
  color: #666;
}

.contact {
  display: inline-block;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.contact:hover {
  color: #005bb5;
}

@media (max-width: 480px) {
  .card {
    padding: 2rem 1.25rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  .logo {
    width: 52px;
    height: 52px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #222;
    --text: #fff;
    --subtext: #aaa;
    --primary: #0a84ff;
  }
  .card {
    background-color: #353535;
    border-color: #484848;
  }
}