@charset "UTF-8";
@view-transition {
  navigation: auto;
}
:root {
  --color-top: #2ea3e0;
  --color-about: #f23159;
  --card: #ffffff;
  --text: #111111;
  --text-muted: #aaaaaa;
  --vt-duration: 1400ms;
}

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

body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--text);
}

main {
  width: 100%;
  min-height: 100vh;
  padding: clamp(16px, 4vw, 32px);
  display: grid;
  place-items: center;
}
main.top {
  background: var(--color-top);
}
main.about {
  background: var(--color-about);
}

.card {
  width: min(400px, 100%);
  margin-inline: auto;
  padding: clamp(24px, 5vw, 40px) clamp(24px, 5vw, 40px) clamp(24px, 4vw, 32px);
  display: grid;
  row-gap: 24px;
  border-radius: 24px;
  background: var(--card);
}

.card__above {
  display: grid;
  gap: 16px;
}

.card__title {
  font-size: clamp(2rem, 4vw, 2.4rem);
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

.card__desc {
  margin: 0;
  font-size: 0.95rem;
  color: #555;
  line-height: 1.6;
}

.card__nav {
  display: grid;
  gap: 16px;
}

.card__below {
  padding-top: 16px;
  border-top: 1px solid #eee;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

.nav-btn {
  display: block;
  padding: 14px 20px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  transition: opacity 0.2s;
}
.nav-btn:hover {
  opacity: 0.75;
}
.nav-btn.is-active {
  background: #f2f2f2;
  color: #111;
}
.nav-btn:not(.is-active) {
  background: #111;
  color: #fff;
}

/* View Transition Animations */
::view-transition-old(root) {
  animation: fade-out var(--vt-duration) ease both;
}

::view-transition-new(root) {
  animation: fade-in var(--vt-duration) ease both;
}

@keyframes fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}
@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}