* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", sans-serif;
  background: lightskyblue;
  color: #0f172a;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 90%;
  max-width: 520px;
}

h1 {
  font-family: "Noto Sans JP", sans-serif;
  text-align: center;
  margin-bottom: 8px;
  text-shadow:
    2px 2px 0 #FFF,
    -2px 2px 0 #FFF,
    2px -2px 0 #FFF,
    -2px -2px 0 #FFF,
    0 2px 0 #FFF,
    0 -2px 0 #FFF,
    2px 0 0 #FFF,
    -2px 0 0 #FFF,
    1px 3px 0 #FFF,
    -1px 3px 0 #FFF,
    3px 1px 0 #FFF,
    -3px 1px 0 #FFF,
    0 3px 0 #FFF,
    3px 0 0 #FFF,
    -3px 0 0 #FFF;
}

.card {
  background: #ffffff;
  border-radius: 18px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow:
    0 12px 24px rgba(0,0,0,0.20),
    0 32px 64px rgba(0,0,0,0.25);
}

.card h2 {
  font-family: "Noto Serif JP", serif;
  margin-top: 0;
  margin-bottom: 16px;
}

.music-item {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

audio {
  width: 100%;
}

/* ===== ゲームボタン ===== */

.game-button {
  display: block;
  text-align: center;
  padding: 16px;
  border-radius: 14px;
  background: linear-gradient(145deg, #38bdf8, #0ea5e9);
  color: #ffffff;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;

  /* 立体感 */
  box-shadow: 0 8px 0 #0369a1;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

/* ホバー */
.game-button:hover {
  filter: brightness(1.05);
}

/* 押したとき（ガチャッ） */
.game-button:active {
  transform: translateY(4px);
  box-shadow: 0 4px 0 #0369a1;
}