:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #f3f7f8;
  color: #18323a;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: linear-gradient(145deg, #edf7f6, #f7f9fb 55%, #e7f0f4);
}

.card {
  width: min(100%, 34rem);
  padding: 2.5rem;
  border: 1px solid #d4e2e5;
  border-radius: 1.25rem;
  background: #fff;
  box-shadow: 0 1.25rem 3.5rem rgba(31, 66, 77, .12);
  text-align: center;
}

.brand { color: #167b78; font-size: 1.45rem; font-weight: 750; letter-spacing: .02em; }
.brand span { color: #425e68; font-weight: 600; }
h1 { margin: 1.4rem 0 .75rem; font-size: clamp(1.55rem, 5vw, 2.1rem); }
p { line-height: 1.55; }
.notice { margin-top: 2rem; color: #657a82; font-size: .9rem; }

.spinner {
  width: 2rem;
  height: 2rem;
  margin: 1.5rem auto 0;
  border: .22rem solid #d9e8e8;
  border-top-color: #168b86;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

.spinner[hidden] { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }