/* =====================
   カラーパレット（変数）
   ===================== */
:root {
  --color-bg:        #f0f4fb;
  --color-surface:   #ffffff;
  --color-border:    #a8cce8;
  --color-text:      #5b8fc9;
  --color-text-dark: #2c4a6e;
  --color-heading:   #7ab3e0;
  --color-accent:    #c8e0f4;
  --color-btn-text:  #6a9fd8;
  --color-muted:     #8eaecb;
}

/* =====================
   リセット・ベース
   ===================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-dark);
  font-size: 15px;
  line-height: 1.7;
}

/* =====================
   ヘッダー
   ===================== */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: 24px 16px;
  text-align: center;
}

.site-title {
  font-size: 1.8rem;
  color: var(--color-heading);
  letter-spacing: 0.05em;
}

.site-desc {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

/* =====================
   ナビゲーション
   ===================== */
.site-nav {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-nav ul {
  display: flex;
  list-style: none;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-nav ul li a {
  display: block;
  padding: 12px 20px;
  text-decoration: none;
  color: var(--color-btn-text);
  font-size: 0.95rem;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s;
}

.site-nav ul li a:hover,
.site-nav ul li a.active {
  border-bottom-color: var(--color-heading);
  color: var(--color-text);
}

/* =====================
   メインコンテンツ
   ===================== */
.main-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 16px;
}

/* =====================
   検索エリア
   ===================== */
.search-section {
  margin-bottom: 28px;
}

.search-input {
  width: 100%;
  padding: 12px 18px;
  border: 2px solid var(--color-border);
  border-radius: 999px;
  font-size: 1rem;
  color: var(--color-text-dark);
  background-color: var(--color-surface);
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--color-heading);
}

.search-result-count {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--color-muted);
  padding-left: 8px;
}

/* =====================
   曲カード（アコーディオン）
   ===================== */
.song-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.song-card:hover {
  box-shadow: 0 2px 12px rgba(122, 179, 224, 0.25);
}

.song-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  user-select: none;
}

.song-header:hover {
  background-color: var(--color-accent);
}

.song-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.song-title {
  font-size: 1.05rem;
  font-weight: bold;
  color: var(--color-text);
}

.song-meta {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.accordion-icon {
  font-size: 1.2rem;
  color: var(--color-heading);
  transition: transform 0.25s;
  flex-shrink: 0;
  margin-left: 12px;
}

.song-card.open .accordion-icon {
  transform: rotate(180deg);
}

/* =====================
   アコーディオン本体
   ===================== */
.song-body {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--color-border);
}

.song-card.open .song-body {
  display: block;
}

.song-body .external-link {
  display: inline-block;
  margin: 12px 0;
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  text-decoration: none;
  color: var(--color-btn-text);
  font-size: 0.9rem;
  transition: background-color 0.2s;
}

.song-body .external-link:hover {
  background-color: var(--color-accent);
}

.song-lyrics {
  background-color: var(--color-bg);
  border-radius: 8px;
  padding: 16px;
  font-size: 0.9rem;
  line-height: 2;
  color: var(--color-text-dark);
  margin: 12px 0;
  white-space: pre-wrap;
}

.call-image {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  margin-top: 12px;
}

/* =====================
   ローディング・空状態
   ===================== */
.loading, .no-result {
  text-align: center;
  color: var(--color-muted);
  padding: 48px 0;
  font-size: 0.95rem;
}

/* =====================
   フッター
   ===================== */
.site-footer {
  text-align: center;
  padding: 24px 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.85rem;
  background-color: var(--color-surface);
  margin-top: 40px;
}

/* =====================
   レスポンシブ
   ===================== */
@media (max-width: 600px) {
  .site-title {
    font-size: 1.3rem;
  }
  .site-nav ul li a {
    padding: 10px 12px;
    font-size: 0.85rem;
  }
}