*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  color-scheme: dark;
  --bg-top: #1d2551; 
  --glow-color: rgba(0, 102, 204, 0.5); /* the bottom blue glow */
  --text-color: #ffffff;
  --muted-line: rgba(255, 255, 255, 0.35);
  --font-body: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  background:
    radial-gradient(
      80% 60% at 50% 120%,
      var(--glow-color) 0%,
      transparent 60%
    ),
    var(--bg-top);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page {
  width: 100%;
  padding: 24px 16px;
}

.content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.logo {
  display: block;
  margin: 0 auto 40px auto;
  max-width: 420px;
  width: 65vw;
  height: auto;
}

.info {
  font-size: 0.98rem;
  line-height: 1.6;
  margin-bottom: 32px;
}

.info p + p {
  margin-top: 4px;
}

.separator {
  width: 320px;
  max-width: 80vw;
  height: 1px;
  margin: 24px auto 24px auto;
  background: var(--muted-line);
}

.email {
  font-size: 0.98rem;
}

.email a {
  color: var(--text-color);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  padding-bottom: 2px;
}

.email a:hover,
.email a:focus-visible {
  border-bottom-color: #ffffff;
}

/* ---------- RESPONSIVE ADJUSTMENTS ---------- */

@media (min-width: 768px) {
  .page {
    padding: 32px 24px;
  }

  .logo {
    max-width: 480px;
    margin-bottom: 48px;
  }

  .info,
  .email {
    font-size: 1.05rem;
  }

  .separator {
    margin: 32px auto 28px auto;
  }
}

@media (min-width: 1200px) {
  .page {
    padding: 40px 24px;
  }

  .logo {
    max-width: 520px;
    margin-bottom: 56px;
  }

  .info,
  .email {
    font-size: 1.1rem;
  }
}