:root {
  --navy: #123c6d;
  --gray: #7a8290;
  --ink: #1c2733;
  --bg: #f4f6f9;
  --card: #ffffff;
  --line: #e1e6ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1420;
    --card: #121d2d;
    --line: #223247;
    --ink: #e8edf3;
    --gray: #9aa5b4;
  }
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 24px;
  color: var(--ink);
  background: var(--bg);
  background-image: radial-gradient(60% 50% at 50% 0%, rgba(18, 60, 109, .10), transparent 70%);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
}

.card {
  width: 100%;
  max-width: 520px;
  padding: clamp(32px, 6vw, 56px) clamp(24px, 6vw, 48px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  text-align: center;
  box-shadow: 0 16px 48px rgba(18, 60, 109, .10);
}

.logo {
  width: clamp(96px, 24vw, 140px);
  height: auto;
  display: block;
  margin: 0 auto 20px;
}

h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(34px, 8vw, 48px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: .04em;
}

@media (prefers-color-scheme: dark) {
  h1 {
    color: #8fb4e6;
  }
}

.sub {
  margin: 8px 0 0;
  color: var(--gray);
  font-size: clamp(12px, 2.6vw, 14px);
  letter-spacing: .28em;
  text-transform: uppercase;
}

.tag {
  margin: 24px 0 0;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.55;
}

.foot {
  margin-top: 28px;
  color: var(--gray);
  font-size: 12px;
  opacity: .8;
}