/* CSS 変数によるテーマ管理 */
:root {
  --color-bg:         #0f0f0f;
  --color-surface:    #1a1a1a;
  --color-border:     #2e2e2e;
  --color-text:       #e0e0e0;
  --color-text-sub:   #888888;
  --color-accent:     #7c6af7;
  --color-hover:      #252535;
  --color-overlay:    rgba(0, 0, 0, 0.7);

  --radius:    6px;
  --font-base: 1rem;
}

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

html { font-size: 16px; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: var(--font-base);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ヘッダー */
.site-header {
  padding: clamp(1rem, 4%, 2rem) clamp(1rem, 5%, 3rem);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.site-title {
  font-size: clamp(1.4rem, 4vw, 2rem);
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.site-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

.site-notice {
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

/* メインコンテンツ */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: clamp(1rem, 3%, 2rem) clamp(1rem, 5%, 3rem);
  gap: 1rem;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
}

/* 検索セクション */
.search-section {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 0.625rem 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: var(--font-base);
  outline: none;
  transition: border-color 0.2s;
}

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

.song-count {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  white-space: nowrap;
}

/* 曲リストセクション */
.song-list-section {
  flex: 1;
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.song-table {
  width: 100%;
  border-collapse: collapse;
}

.song-table th {
  background-color: var(--color-surface);
  color: var(--color-text-sub);
  font-size: 0.8125rem;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.song-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.song-table tbody tr:last-child td { border-bottom: none; }

.song-table tbody tr {
  cursor: pointer;
  transition: background-color 0.15s;
}

.song-table tbody tr:hover { background-color: var(--color-hover); }

.loading-row td,
.empty-row td {
  text-align: center;
  color: var(--color-text-sub);
  padding: 2rem;
  cursor: default;
}

/* モーダル */
.request-modal {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  padding: clamp(1.25rem, 5%, 2rem);
  width: min(90%, 480px);
  max-height: 90dvh;
  overflow-y: auto;
  /* ブラウザ差異を吸収して確実に中央配置する */
  position: fixed;
  inset: 0;
  margin: auto;
}

.request-modal::backdrop {
  background-color: var(--color-overlay);
}

.modal-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 0;
  right: 0;
  background: none;
  border: none;
  color: var(--color-text-sub);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
}

.modal-close:hover { color: var(--color-text); }

.modal-title {
  font-size: 1.125rem;
  padding-right: 2rem;
}

.modal-song-name {
  font-size: 1rem;
  font-weight: bold;
}

.modal-artist-name {
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

/* リクエストフォーム */
.request-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-label {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

.form-label--checkbox {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  cursor: pointer;
}

.form-input {
  padding: 0.5rem 0.75rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: var(--font-base);
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus { border-color: var(--color-accent); }

.form-checkbox { accent-color: var(--color-accent); }

.form-notice {
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

.list-request-section {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.free-request-section {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.free-request-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.free-request-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.free-request-fields {
  display: flex;
  gap: 0.5rem;
}

.free-request-fields .form-input { flex: 1; }

.submit-button {
  padding: 0.75rem 1.5rem;
  background-color: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: var(--font-base);
  cursor: pointer;
  transition: opacity 0.2s;
}

.submit-button:hover { opacity: 0.85; }

/* リクエスト結果ダイアログ */
.result-dialog {
  border: none;
  border-radius: 12px;
  padding: 2rem 2.5rem;
  text-align: center;
  background: #1e1e2e;
  color: #cdd6f4;
  min-width: 280px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  position: fixed;
  inset: 0;
  margin: auto;
}

.result-dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.result-message {
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.result-message--success { color: #a6e3a1; }
.result-message--error   { color: #f38ba8; }

.result-close-button {
  padding: 0.5rem 1.5rem;
  border: none;
  border-radius: 6px;
  background: #45475a;
  color: #cdd6f4;
  cursor: pointer;
  font-size: 0.875rem;
}

.result-close-button:hover { background: #585b70; }