:root {
  --bg: #f6f8f8;
  --ink: #10233f;
  --accent: #0f766e;
  --card: #ffffff;
  --line: #d5e4e2;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.75;
}

main {
  width: min(40rem, calc(100% - 2rem));
  margin: 2.5rem auto;
  padding: 2rem 1.5rem 2.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 6px solid var(--accent);
  border-radius: 12px;
}

.version {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0 0 1.25rem;
  color: var(--ink);
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  line-height: 1.3;
}

.lead {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 700;
}

p {
  margin: 0 0 1rem;
}

.status {
  margin: 1.5rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--accent);
  font-weight: 700;
}

@media (max-width: 480px) {
  main {
    width: calc(100% - 1.25rem);
    margin: 0.75rem auto 1.5rem;
    padding: 1.35rem 1.1rem 1.5rem;
  }
}