:root {
  color: #162033;
  background: #f3f7fb;
  font-family: "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
}

.app-shell {
  width: min(100%, 560px);
  padding: clamp(32px, 8vw, 64px);
  text-align: center;
  background: #fff;
  border: 1px solid #dce5ef;
  border-radius: 20px;
  box-shadow: 0 16px 42px rgba(33, 60, 94, 0.12);
}

.app-logo {
  width: clamp(88px, 20vw, 132px);
  height: auto;
  margin-bottom: 20px;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 6vw, 40px);
  letter-spacing: 0.04em;
}

p {
  margin: 16px 0 0;
  color: #5d6d82;
  font-size: clamp(16px, 3.5vw, 19px);
}