/* ==========================================================================
   東京大学OPAC Plus "言選Web" メインスタイルシート
   ========================================================================== */

:root {
  --primary-color: #0d6efd;
  --primary-dark: #0a58ca;
  --secondary-color: #6c757d;
  --accent-green: #198754;
  --bg-light: #f8f9fa;
  --border-color: #dee2e6;
  --text-dark: #212529;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text-dark);
  background-color: #f5f7fb;
  line-height: 1.6;
}

/* ヘッダー */
.site-header {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  color: #ffffff;
  padding: 2.5rem 0 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.site-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-subtitle {
  font-size: 1.05rem;
  opacity: 0.9;
  font-weight: 300;
}

/* メインコンテナ */
.main-card {
  border: none;
  border-radius: 12px;
  background-color: #ffffff;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  padding: 2rem;
  margin-bottom: 2rem;
}

/* 説明文 */
.guide-box {
  background-color: #eef4fc;
  border-left: 4px solid var(--primary-color);
  padding: 1rem 1.25rem;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.guide-box ol {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.guide-box li {
  margin-bottom: 0.35rem;
}

/* 入力エリア */
.search-form-area {
  margin-bottom: 1.5rem;
}

.input-group-custom {
  position: relative;
}

.keyword-input {
  border-radius: 8px !important;
  font-size: 1.15rem;
  padding: 0.75rem 1rem;
  border: 2px solid #cbd5e1;
  transition: all 0.2s ease;
}

.keyword-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
}

.char-counter {
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 0.35rem;
}

.btn-search {
  padding: 0.75rem 1.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(13, 110, 253, 0.3);
}

.btn-clear {
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
}

/* サンプルキーワード */
.sample-words-area {
  font-size: 0.9rem;
  color: #64748b;
}

.sample-tag {
  display: inline-block;
  background-color: #f1f5f9;
  color: #334155;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-right: 0.4rem;
  text-decoration: none;
  transition: all 0.15s ease;
  border: 1px solid #e2e8f0;
}

.sample-tag:hover {
  background-color: #e2e8f0;
  color: var(--primary-dark);
}

/* オプション */
.search-options-area {
  background-color: #f8fafc;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-top: 1.25rem;
  border: 1px solid #e2e8f0;
  font-size: 0.95rem;
}

/* 進行状況カード */
.status-card {
  display: none;
  border: none;
  border-radius: 10px;
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  margin-bottom: 2rem;
  padding: 1.5rem;
}

/* シソーラスカード */
.thesaurus-card {
  border-radius: 10px;
  overflow: hidden;
}

.thesaurus-card .card-header {
  font-size: 1.05rem;
}

.thesaurus-row {
  line-height: 1.8;
  padding: 0.25rem 0;
  border-bottom: 1px dashed #e2e8f0;
}

.thesaurus-row:last-child {
  border-bottom: none;
}

.thesaurus-word-link {
  color: #0f172a;
  border-bottom: 1px dotted #94a3b8;
  padding: 0 2px;
  transition: color 0.15s;
}

.thesaurus-word-link:hover {
  color: var(--accent-green);
  border-bottom-style: solid;
}

.expand-search-btn {
  font-size: 0.8rem;
  padding: 0.15rem 0.5rem;
  vertical-align: middle;
}

/* 用語リスト */
.terms-card {
  border: none;
  border-radius: 12px;
  background-color: #ffffff;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  padding: 1.75rem;
}

.term-item {
  transition: background-color 0.15s ease;
  border-color: #edf2f7;
}

.term-item:hover {
  background-color: #f8fafc;
}

.action-icon-btn {
  display: inline-block;
  line-height: 1;
  transition: transform 0.15s ease;
}

.action-icon-btn:hover {
  transform: scale(1.1);
}

.action-icon {
  height: 22px;
  width: auto;
  vertical-align: middle;
}

.simmular-icon {
  height: 18px;
  width: auto;
  vertical-align: middle;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.simmular-icon:hover {
  transform: scale(1.2);
}

/* 用語サイズの階層 */
.term-name-link {
  transition: color 0.15s ease;
  line-height: 1.4;
}

.term-name-link:hover {
  color: var(--primary-dark);
  text-decoration: underline !important;
}

.size-level-3 {
  font-size: 1.45rem;
  color: #0369a1;
}

.size-level-2 {
  font-size: 1.25rem;
  color: #0284c7;
}

.size-level-1 {
  font-size: 1.1rem;
  color: #0ea5e9;
}

.size-level-0 {
  font-size: 0.98rem;
  color: #38bdf8;
}

/* フッター */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
  padding: 2rem 0;
  margin-top: 4rem;
  font-size: 0.88rem;
  color: #64748b;
}

.footer-links a {
  color: #475569;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* レスポンシブ調整 */
@media (max-width: 768px) {
  .site-title {
    font-size: 1.5rem;
  }
  .main-card {
    padding: 1.25rem;
  }
  .size-level-3 {
    font-size: 1.25rem;
  }
  .size-level-2 {
    font-size: 1.15rem;
  }
}