/* Page Header */
.page-header {
  height: 300px;
  background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
    url('https://images.unsplash.com/photo-1522335789203-aabd1fc54bc9?auto=format&fit=crop&q=80') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0;
  position: relative;
}

.page-header-content {
  text-align: center;
  color: var(--color-secondary);
  padding-top: 74px;
}

.page-title {
  font-size: 3rem;
  font-weight: 400;
  letter-spacing: 4px;
  margin-bottom: 0.5rem;
  margin-top: 15px;
}

.page-subtitle {
  font-size: 1rem;
  letter-spacing: 2px;
  opacity: 0.9;
}

/* Columns Section */
.columns-section {
  padding: 10rem 2rem;
  background: linear-gradient(to bottom, var(--color-secondary), #fafafa);
}

.columns-container {
  max-width: 1200px;
  margin: 0 auto;
}

.columns-header {
  text-align: center;
  margin-bottom: 5rem;
}

.columns-description {
  font-size: 1rem;
  letter-spacing: 1px;
  opacity: 0.7;
  margin-top: 1.5rem;
  font-weight: 300;
}

/* Controls */
.columns-controls {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 6rem;
  align-items: center;
  background: white;
  padding: 3rem;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.search-box {
  display: flex;
  gap: 1rem;
  width: 100%;
  max-width: 600px;
}

.search-input {
  flex: 1;
  padding: 1rem 1.8rem;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 50px;
  font-size: 0.95rem;
  font-family: 'Noto Serif JP', serif;
  letter-spacing: 0.5px;
  transition: all 0.3s ease;
  background: #fafafa;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(201, 160, 99, 0.1);
  background: white;
}

.search-btn {
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  color: var(--color-secondary);
  border: none;
  border-radius: 50px;
  font-size: 0.9rem;
  font-family: 'Noto Serif JP', serif;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.4s ease;
  box-shadow: 0 4px 15px rgba(201, 160, 99, 0.3);
}

.search-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 160, 99, 0.4);
}

.filter-box {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.filter-btn {
  padding: 0.7rem 1.8rem;
  border: 1px solid rgba(201, 160, 99, 0.3);
  background: white;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-family: 'Noto Serif JP', serif;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 50px;
  font-weight: 300;
}

.filter-btn:hover,
.filter-btn.active {
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  color: var(--color-secondary);
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(201, 160, 99, 0.25);
}

/* Loading State */
.loading-state {
  text-align: center;
  padding: 8rem 2rem;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(201, 160, 99, 0.15);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  margin: 0 auto 2rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-state p {
  font-size: 0.95rem;
  letter-spacing: 1px;
  opacity: 0.6;
  font-weight: 300;
}

/* No Results */
.no-results {
  text-align: center;
  padding: 6rem 2rem;
  color: var(--color-primary);
  opacity: 0.6;
  font-size: 1rem;
  letter-spacing: 1px;
  font-weight: 300;
}

/* Columns Grid */
.columns-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 5rem;
}

.column-card {
  background: white;
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  cursor: pointer;
  position: relative;
}

.column-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(201, 160, 99, 0.05), transparent);
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 1;
  pointer-events: none;
}

.column-card:hover::before {
  opacity: 1;
}

.column-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.column-card-image {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: linear-gradient(135deg, #f5f5f5, #e8e8e8);
  position: relative;
}

.column-card-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(0, 0, 0, 0.3));
  opacity: 0;
  transition: opacity 0.5s ease;
}

.column-card:hover .column-card-image::after {
  opacity: 1;
}

.column-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.column-card:hover .column-card-image img {
  transform: scale(1.08);
}

.column-card-content {
  padding: 2.5rem;
  position: relative;
  z-index: 2;
}

.column-card-category {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  color: var(--color-secondary);
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  border-radius: 50px;
  margin-bottom: 1.3rem;
  font-weight: 400;
  text-transform: uppercase;
}

.column-card-title {
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.5px;
  line-height: 1.7;
  margin-bottom: 1.3rem;
  color: var(--color-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 3.4rem;
}

.column-card-date {
  font-size: 0.85rem;
  letter-spacing: 1px;
  opacity: 0.5;
  color: var(--color-primary);
  font-weight: 300;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 4rem;
}

.pagination-btn {
  min-width: 45px;
  height: 45px;
  padding: 0 1rem;
  border: 1px solid rgba(201, 160, 99, 0.3);
  background: white;
  color: var(--color-primary);
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 50px;
  font-family: 'Noto Serif JP', serif;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 300;
}

.pagination-btn:hover,
.pagination-btn.active {
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  color: var(--color-secondary);
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(201, 160, 99, 0.25);
}

.pagination-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.pagination-btn:disabled:hover {
  background: white;
  color: var(--color-primary);
  box-shadow: none;
}

/* Article Detail Page */
.error-state {
  text-align: center;
  padding: 10rem 2rem;
  background-color: var(--color-secondary);
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content h2 {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 2px;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.error-content p {
  font-size: 1rem;
  letter-spacing: 0.5px;
  opacity: 0.6;
  margin-bottom: 3rem;
  font-weight: 300;
}

.article-content {
  background: linear-gradient(to bottom, var(--color-secondary), #fafafa);
  padding: 10rem 2rem 5rem;
}

.article-header {
  max-width: 900px;
  margin: 0 auto 3rem;
  text-align: center;
  position: relative;
}

.article-header::after {
  content: '';
  position: absolute;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.article-category {
  margin-bottom: 1.5rem;
}

.category-tag {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  color: var(--color-secondary);
  font-size: 0.8rem;
  letter-spacing: 2px;
  border-radius: 50px;
  text-transform: uppercase;
  font-weight: 400;
}

.article-title {
  font-size: 2.8rem;
  font-weight: 300;
  letter-spacing: 1px;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-size: 0.95rem;
  letter-spacing: 1px;
  opacity: 0.5;
  font-weight: 300;
}

.article-eyecatch {
  max-width: 1100px;
  margin: 0 auto 3rem;
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.eyecatch-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  max-width: 850px;
  margin: 0 auto;
  background: white;
  padding: 3rem;
  border-radius: 12px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

.article-text {
  font-size: 1.1rem;
  line-height: 2.2;
  letter-spacing: 0.3px;
  color: var(--color-primary);
  font-weight: 300;
}

.article-text h2 {
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 1px;
  margin: 3rem 0 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-accent);
  color: var(--color-primary);
}

.article-text h2:first-child {
  margin-top: 0;
}

.article-text h3 {
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: 0.5px;
  margin: 2.5rem 0 1rem;
  color: var(--color-accent);
}

.article-text p {
  margin-bottom: 1.5rem;
}

/* Lists */
.article-text ul,
.article-text ol {
  margin: 1.5rem 0;
  padding-left: 2.5rem;
}

.article-text ul {
  list-style-type: disc;
}

.article-text ol {
  list-style-type: decimal;
}

.article-text li {
  margin-bottom: 1rem;
  line-height: 2;
  padding-left: 0.5rem;
}

.article-text li:last-child {
  margin-bottom: 0;
}

/* Nested lists */
.article-text ul ul,
.article-text ol ul {
  list-style-type: circle;
  margin: 0.8rem 0;
  padding-left: 2rem;
}

.article-text ul ul ul,
.article-text ol ul ul {
  list-style-type: square;
}

.article-text ol ol,
.article-text ul ol {
  list-style-type: lower-alpha;
  margin: 0.8rem 0;
  padding-left: 2rem;
}

.article-text ol ol ol,
.article-text ul ol ol {
  list-style-type: lower-roman;
}

.article-text li > ul,
.article-text li > ol {
  margin-top: 0.5rem;
}

.article-text img {
  width: 100%;
  height: auto;
  margin: 2rem 0;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.article-text a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 160, 99, 0.3);
  transition: all 0.3s ease;
  padding-bottom: 2px;
}

.article-text a:hover {
  border-bottom-color: var(--color-accent);
}

.article-text blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-left: 4px solid var(--color-accent);
  background: #fafafa;
  font-style: italic;
  opacity: 0.9;
}

.article-text code {
  background: #f5f5f5;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.95em;
  color: #c92a2a;
}

.article-text pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 2rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 2rem 0;
}

.article-text pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* Tables */
.article-text table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.article-text thead {
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
}

.article-text thead th {
  color: var(--color-secondary);
  font-weight: 500;
  text-align: left;
  padding: 1.2rem 1.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
}

.article-text tbody tr {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background-color 0.2s ease;
}

.article-text tbody tr:last-child {
  border-bottom: none;
}

.article-text tbody tr:hover {
  background: rgba(201, 160, 99, 0.03);
}

.article-text td {
  padding: 1.2rem 1.5rem;
  color: var(--color-primary);
  vertical-align: top;
}

.article-text tbody tr:nth-child(even) {
  background: #fafafa;
}

.article-text tbody tr:nth-child(even):hover {
  background: rgba(201, 160, 99, 0.05);
}

/* Table wrapper for responsive design */
.article-text table {
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

@media (max-width: 768px) {
  .article-text table {
    font-size: 0.9rem;
  }

  .article-text th,
  .article-text td {
    padding: 1rem;
  }
}

.article-footer {
  max-width: 850px;
  margin: 5rem auto 0;
  padding-top: 3rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.article-navigation {
  display: flex;
  justify-content: center;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 2.5rem;
  border: 1px solid rgba(0, 0, 0, 0.2);
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 1px;
  transition: all 0.4s ease;
  border-radius: 50px;
  font-weight: 300;
}

.back-btn:hover {
  background: linear-gradient(135deg, var(--color-accent), #b38f53);
  border-color: var(--color-accent);
  color: var(--color-secondary);
  box-shadow: 0 4px 15px rgba(201, 160, 99, 0.3);
  transform: translateX(-5px);
}

/* Related Section */
.related-section {
  padding: 8rem 2rem;
  background: linear-gradient(to bottom, #fafafa, white);
}

.related-container {
  max-width: 1200px;
  margin: 0 auto;
}

.related-header {
  text-align: center;
  margin-bottom: 5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .columns-grid,
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .page-header {
    height: 300px;
  }

  .page-title {
    font-size: 2.5rem;
    letter-spacing: 4px;
  }

  .columns-section {
    padding: 6rem 1.5rem;
  }

  .columns-controls {
    padding: 2rem 1.5rem;
    gap: 2rem;
  }

  .search-box {
    flex-direction: column;
    max-width: 100%;
  }

  .search-btn {
    width: 100%;
  }

  .filter-box {
    gap: 0.5rem;
  }

  .filter-btn {
    font-size: 0.8rem;
    padding: 0.6rem 1.3rem;
  }

  .columns-grid,
  .related-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .article-content {
    padding: 8rem 1.5rem 4rem;
  }

  .article-title {
    font-size: 1.8rem;
    letter-spacing: 0.5px;
  }

  .article-header {
    margin-bottom: 2.5rem;
  }

  .article-eyecatch {
    margin-bottom: 2.5rem;
  }

  .article-body {
    padding: 2.5rem 2rem;
  }

  .article-text {
    font-size: 1.05rem;
    line-height: 2;
  }

  .article-text h2 {
    font-size: 1.6rem;
    margin: 3rem 0 1.5rem;
  }

  .article-text h3 {
    font-size: 1.4rem;
  }

  .article-text blockquote {
    padding: 1.5rem 2rem;
  }
}

@media (max-width: 480px) {
  .page-title {
    font-size: 1.8rem;
    letter-spacing: 2px;
  }

  .page-subtitle {
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.5rem;
    letter-spacing: 2px;
  }

  .column-card-content {
    padding: 2rem;
  }

  .column-card-title {
    font-size: 1.2rem;
  }

  .pagination-btn {
    min-width: 40px;
    height: 40px;
    font-size: 0.85rem;
  }

  /* Article Detail Page */
  .article-content {
    padding: 7rem 1rem 3rem;
  }

  .article-header {
    margin-bottom: 2rem;
  }

  .article-category {
    margin-bottom: 1.5rem;
  }

  .article-title {
    font-size: 1.5rem;
    letter-spacing: 0.5px;
    margin-bottom: 1.5rem;
  }

  .article-meta {
    font-size: 0.85rem;
    gap: 1rem;
  }

  .article-eyecatch {
    margin-bottom: 2rem;
    border-radius: 8px;
  }

  .article-body {
    padding: 2rem 1.5rem;
  }

  .article-text {
    font-size: 1rem;
    line-height: 2;
  }

  .article-text h2 {
    font-size: 1.3rem;
    margin: 2.5rem 0 1.5rem;
    padding-bottom: 0.8rem;
  }

  .article-text h3 {
    font-size: 1.15rem;
    margin: 2rem 0 1rem;
  }

  .article-text blockquote {
    padding: 1.5rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
  }

  .article-text ul,
  .article-text ol {
    padding-left: 1.5rem;
    margin: 1.5rem 0;
  }

  .article-text img {
    margin: 2rem 0;
  }

  .related-articles {
    padding: 3rem 1.5rem;
  }

  .related-articles h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
  }
}