:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --text: #1d2430;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, #ffffff, var(--bg));
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  padding: 1rem;
}

main {
  width: min(100%, 560px);
  text-align: center;
  background: var(--card);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
}

img {
  width: 100%;
  max-width: 360px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 12px;
}