:root {
  --bg: #07060f;
  --card: rgba(18, 14, 38, 0.75);
  --text: #e9e6ff;
  --sub: #9a94c4;
  --pink: #ff2fd6;
  --cyan: #22f3ff;
  --purple: #9b5cff;
  --lime: #b6ff3b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "M PLUS Rounded 1c", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 10%, rgba(255, 47, 214, 0.18), transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(34, 243, 255, 0.15), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(155, 92, 255, 0.2), transparent 50%),
    var(--bg);
  overflow-x: hidden;
}
/* 背景のグリッド */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(155, 92, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 92, 255, 0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: -1;
}

/* ===== ヘッダー ===== */
header {
  text-align: center;
  padding: 72px 16px 40px;
}
.logo {
  font-family: "Orbitron", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 7vw, 3.6rem);
  letter-spacing: 0.08em;
  margin: 0;
  color: #fff;
  text-shadow:
    0 0 6px #fff,
    0 0 14px var(--pink),
    0 0 28px var(--pink),
    0 0 56px var(--pink);
  animation: flicker 4s infinite;
}
.subtitle {
  margin: 16px 0 0;
  color: var(--cyan);
  letter-spacing: 0.15em;
  text-shadow: 0 0 8px var(--cyan);
}
@keyframes flicker {
  0%, 18%, 22%, 25%, 53%, 57%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: 0.4; }
}

/* ===== カード一覧 ===== */
main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}
.card {
  --neon: var(--cyan);
  position: relative;
  background: var(--card);
  border: 2px solid var(--neon);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(6px);
  box-shadow:
    0 0 10px var(--neon),
    inset 0 0 12px rgba(255, 255, 255, 0.05);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:nth-child(3n+2) { --neon: var(--pink); }
.card:nth-child(3n+3) { --neon: var(--purple); }
.card:hover {
  transform: translateY(-6px);
  box-shadow:
    0 0 18px var(--neon),
    0 0 42px var(--neon);
}

.thumb {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.06), transparent 70%),
    #0d0a1f;
  border-bottom: 2px solid var(--neon);
  overflow: hidden;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.thumb svg {
  width: 60%;
  height: auto;
  filter: drop-shadow(0 0 6px var(--neon)) drop-shadow(0 0 14px var(--neon));
}

.card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.card h2 {
  margin: 0 0 10px;
  font-size: 1.25rem;
  color: #fff;
  text-shadow: 0 0 8px var(--neon);
}
.card p {
  margin: 0 0 20px;
  color: var(--sub);
  line-height: 1.7;
  flex: 1;
}
.play {
  display: block;
  text-align: center;
  font-family: "Orbitron", sans-serif;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--neon);
  text-decoration: none;
  padding: 12px;
  border: 2px solid var(--neon);
  border-radius: 10px;
  text-shadow: 0 0 8px var(--neon);
  box-shadow: 0 0 8px var(--neon), inset 0 0 8px var(--neon);
  transition: background 0.2s, color 0.2s;
}
.play:hover {
  background: var(--neon);
  color: #0d0a1f;
  text-shadow: none;
}
/* 遊び方・ルール（紹介ページ）へのリンク */
.detail {
  display: block;
  margin-top: 12px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--sub);
  text-decoration: none;
}
.detail:hover { color: var(--neon); text-decoration: underline; }

/* Coming soon */
.card.soon { --neon: #5a5480; box-shadow: 0 0 6px rgba(90, 84, 128, 0.6); }
.card.soon:hover { transform: none; box-shadow: 0 0 10px rgba(90, 84, 128, 0.8); }
.soon .thumb span {
  font-family: "Orbitron", sans-serif;
  font-size: 3.5rem;
  font-weight: 800;
  color: #5a5480;
  text-shadow: 0 0 10px rgba(155, 92, 255, 0.5);
  animation: pulse 2.4s ease-in-out infinite;
}
.soon .play {
  cursor: default;
  color: #7d77a8;
  text-shadow: none;
  box-shadow: none;
  border-style: dashed;
}
.soon .play:hover { background: transparent; color: #7d77a8; }
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

footer {
  text-align: center;
  color: var(--sub);
  padding: 56px 16px 32px;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}
/* フッターのリンク（プライバシーポリシー・お問い合わせ） */
.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 12px;
}
.footer-links a { color: var(--sub); text-decoration: none; }
.footer-links a:hover { color: var(--cyan); text-decoration: underline; }