/**
 * problems.css
 * 過去問題アーカイブ (PROBLEMS) ページのカスタムスタイル
 */

.problems-page {
  max-width: 1152px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  flex: 1;
}

/* フィルタータブ */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.filter-tab {
  font-family: 'Silkscreen', cursive;
  font-size: 0.7rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--nav-link-color);
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.filter-tab:hover {
  color: var(--text-color);
  border-color: var(--text-color);
}

.filter-tab.active {
  background: var(--btn-bg);
  color: var(--btn-text);
  border-color: var(--btn-bg);
}

.problems-search-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.problems-search-input {
  flex: 1;
  min-width: 250px;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  background-color: var(--panel-bg);
  color: var(--text-color);
  border-radius: 4px;
}

.problems-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

.problems-table th {
  font-family: 'Silkscreen', cursive;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--nav-link-color);
  text-align: center;
  padding: 0.95rem 1.1rem;
  border-bottom: 2px solid var(--border-color);
  font-weight: bold;
  white-space: nowrap;
}

.problems-table th:first-child {
  text-align: left;
}

.problems-table td {
  padding: 0.95rem 1.1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
  color: var(--text-color);
  text-align: center;
  white-space: nowrap;
}

.problems-table td:first-child {
  text-align: left;
}

.problems-table tr:hover td {
  background-color: rgba(128, 128, 128, 0.05);
}

.prob-cell-link {
  font-family: 'Silkscreen', cursive;
  font-size: 0.95rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: opacity 0.2s;
}

.prob-cell-link:hover {
  opacity: 0.7;
  text-decoration: underline;
}

.prob-contest-link {
  font-family: 'Silkscreen', cursive;
  font-size: 0.95rem;
  color: var(--text-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

.prob-contest-link:hover {
  opacity: 0.7;
  text-decoration: underline;
}