/* ====== 基本設定 ====== */
body {
  font-family: "Rounded Mplus 1c", "Hiragino Maru Gothic ProN", sans-serif;
  margin: 0;
  background: #fffaf5;
  color: #333;
  text-align: center;
}

h1, h2 {
  margin: 0;
}

/* ====== ヘッダー ====== */
header {
  background: linear-gradient(90deg, #ffb6c1, #ffe066, #87cefa);
  padding: 80px 20px 40px; /* 上に余白を多めにとる（ボタン分） */
  text-align: center;      /* タイトルとキャッチを中央揃え */
  position: relative;
}

header h1 {
  font-size: 2.5rem;
  margin: 0;
}

header .catch {
  font-size: 1.2rem;
  margin-top: 10px;
}

/* ✅ 右上固定ボタン */
.back-btn {
  position: absolute;  /* headerの中で右上に配置 */
  top: 20px;
  right: 20px;
  background: #ff7b54;
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.back-btn:hover {
  background: #ff6338;
}


/* ====== メイン画像 ====== */
.main-image img {
  max-width: 90%;
  border-radius: 20px;
  margin-top: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* ====== あそびかた ====== */
.howto h2, .features h2, .download h2 {
  font-size: 1.8rem;
  margin-top: 40px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 20px;
}
.step {
  background: #ffe8a3;
  padding: 12px;
  border-radius: 15px;
  font-size: 1.2rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* ====== 特徴 ====== */
.cards {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin: 20px;
}
.card {
  background: #d8f3dc;
  padding: 15px;
  border-radius: 15px;
  font-size: 1.1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* ====== ダウンロード ====== */
.btn {
  display: inline-block;
  margin: 10px;
  padding: 15px 25px;
  border-radius: 30px;
  font-size: 1.2rem;
  text-decoration: none;
  color: white;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
.btn.google {
  background: #34a853;
}
.btn.apple {
  background: #333;
}

/* ====== play ====== */

.play-btn {
  display: inline-block;
  background: #ff7b54;
  color: white;
  padding: 15px 30px;
  font-size: 1.3rem;
  border-radius: 30px;
  text-decoration: none;
  margin-top: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.play-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}


/* ====== フッター ====== */
footer {
  background: #fafafa;
  padding: 15px;
  margin-top: 40px;
  font-size: 0.9rem;
  color: #666;
}

/* ====== レスポンシブ対応 ====== */
@media (min-width: 768px) {
  .steps, .cards {
    flex-direction: row;
    justify-content: center;
  }
  .step, .card {
    flex: 1;
    margin: 0 10px;
  }
}