:root {
  --bg-top: #f9fbfc;
  --bg-bottom: #eef3f6;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #506170;
  --accent: #5da9dd;
  --accent-soft: #d8ecf9;
  --border: #d9e3ea;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

.card {
  width: min(700px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  box-shadow: 0 8px 20px rgba(34, 60, 80, 0.08);
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.7rem, 3.2vw, 2.2rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #15202b;
}

p {
  margin: 0.8rem 0;
  font-size: clamp(1.05rem, 2.1vw, 1.15rem);
  line-height: 1.65;
  color: var(--muted);
}

a {
  color: #247eb5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease;
  background-color: var(--accent-soft);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
}

a:hover,
a:focus-visible {
  color: #195f8b;
  border-color: #195f8b;
  outline: none;
}

@media (max-width: 520px) {
  .card {
    border-radius: 10px;
  }
}