:root {
  --bg: #f5f7fb;
  --text: #1c2430;
  --primary: #0c7ff2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 70%);
  color: var(--text);
}

.container {
  width: min(90%, 720px);
  margin: 10vh auto;
  text-align: center;
}

h1 {
  margin-bottom: 12px;
}

p {
  margin-bottom: 28px;
}

.button {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  background: var(--primary);
}

.button:hover {
  filter: brightness(1.05);
}