:root {
  --primary-color: #2f5d8a;      /* 落ち着いた空色 */
  --secondary-color: #1f3f5a;    /* 濃い青 */
  --accent-color: #c7d8ea;       /* 薄い雲色 */
  --text-primary: #22313f;
  --text-secondary: #4a5a6a;
  --bg-primary: #ffffff;
  --bg-secondary: #f4f7fb;
  --border-light: rgba(0,0,0,0.08);
  --shadow-medium: 0 10px 30px rgba(0,0,0,0.12);
}

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

body.castle-theme {
  font-family: 'Zen Kaku Gothic New','Hiragino Kaku Gothic ProN','Yu Gothic',sans-serif;
  background:
    linear-gradient(
      to bottom,
      #eaf3fb 0%,
      #f7fbff 40%,
      #ffffff 100%
    );
  color: var(--text-primary);
  padding: 20px;
}

/* ===== コンテナ ===== */

.container {
  max-width: 900px;
  margin: 0 auto;
  background: rgba(255,255,255,0.96);
  border-radius: 18px;
  box-shadow: var(--shadow-medium);
  overflow: hidden;
  border: 1px solid rgba(180,200,220,0.4);
}

/* ===== ヘッダー ===== */

.header {
  background:
    linear-gradient(
      135deg,
      rgba(47,93,138,0.95),
      rgba(31,63,90,0.95)
    );
  color: #ffffff;
  padding: 60px 40px;
  text-align: center;
}

.app-title {
  font-family: 'Shippori Mincho','Yu Mincho',serif;
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  letter-spacing: 0.15em;
}

.app-subtitle {
  margin-top: 18px;
  font-size: 1rem;
  letter-spacing: 0.18em;
  opacity: 0.9;
}

/* ===== コンテンツ ===== */

.content {
  padding: 50px;
}

.section {
  margin-bottom: 50px;
}

/* 見出し */

.section-title {
  font-family: 'Shippori Mincho','Yu Mincho',serif;
  font-size: 1.6rem;
  margin-bottom: 25px;
  padding-left: 18px;
  border-left: 5px solid var(--primary-color);
  color: var(--secondary-color);
}

/* ===== アプリ説明ブロック ===== */

.app-info {
  background:
    linear-gradient(
      to bottom,
      #ffffff,
      #f6f9fc
    );
  padding: 35px;
  border-radius: 14px;
  border: 1px solid rgba(180,200,220,0.45);
}

.description-content h4 {
  font-family: 'Shippori Mincho','Yu Mincho',serif;
  color: var(--primary-color);
  margin-top: 26px;
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 3px solid var(--accent-color);
}

/* ===== 特徴リスト ===== */

.features-list {
  list-style: none;
  margin-top: 25px;
}

.features-list li {
  position: relative;
  padding-left: 42px;
  margin: 12px 0;
  color: var(--text-secondary);
}

.features-list li::before {
  content: "🏯";
  position: absolute;
  left: 0;
  top: 0;
}

/* ===== 運営情報・問い合わせ ===== */

.company-info,
.contact-info {
  background:
    linear-gradient(
      to bottom,
      #f8fbff,
      #eef5fb
    );
  padding: 35px;
  border-radius: 14px;
  border: 1px solid rgba(180,200,220,0.45);
}

.company-info h3,
.contact-info h3 {
  font-family: 'Shippori Mincho','Yu Mincho',serif;
  color: var(--secondary-color);
  margin-bottom: 18px;
}

/* ===== 日付 ===== */

.date-info {
  margin-top: 40px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ===== モバイル対応 ===== */

@media (max-width: 768px) {
  .content {
    padding: 30px;
  }

  .header {
    padding: 45px 25px;
  }

  .app-title {
    letter-spacing: 0.12em;
  }
}