/* ============================================
  Column (コラム) スタイル
  記事一覧 + 記事個別ページ共通
============================================ */

/* ---------- ページヘッダー ---------- */
.column-hero {
  background: linear-gradient(135deg, var(--color-navy, #0F1F4C) 0%, #1E3A8A 100%);
  color: #FFFFFF;
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}

.column-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(135deg, transparent, transparent 30px, rgba(255,255,255,0.02) 30px, rgba(255,255,255,0.02) 32px);
  pointer-events: none;
}

.column-hero .container {
  position: relative;
}

.column-hero-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.7);
  margin-bottom: 16px;
}

.column-hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
  color: #FFFFFF;
}

.column-hero-lead {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  line-height: 1.95;
  max-width: 680px;
}

@media (max-width: 768px) {
  .column-hero {
    padding: 80px 0 48px;
  }
  .column-hero-title {
    font-size: 1.75rem;
  }
  .column-hero-lead {
    font-size: 0.875rem;
  }
}

/* ---------- パンくず ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: #FFFFFF;
}

.breadcrumb .sep {
  opacity: 0.5;
}

/* 記事ページのパンくずは記事ヘッダー内なので別カラー */
.article-hero .breadcrumb {
  color: var(--color-text-muted, #6B7280);
}

.article-hero .breadcrumb a {
  color: var(--color-text-muted, #6B7280);
}

.article-hero .breadcrumb a:hover {
  color: var(--color-navy, #0F1F4C);
}

/* ---------- フィルター ---------- */
.column-filter-section {
  background: #FFFFFF;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border, #E5E7EB);
}

.column-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--color-bg-soft, #F5F6F8);
  border: 1px solid var(--color-border, #E5E7EB);
  color: var(--color-text-muted, #6B7280);
  padding: 10px 20px;
  border-radius: 999px;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  background: #FFFFFF;
  border-color: var(--color-navy, #0F1F4C);
  color: var(--color-navy, #0F1F4C);
}

.filter-btn.active {
  background: var(--color-navy, #0F1F4C);
  border-color: var(--color-navy, #0F1F4C);
  color: #FFFFFF;
}

/* ---------- 記事一覧 ---------- */
.column-list-section {
  padding: 64px 0 96px;
  background: var(--color-bg-soft, #F5F6F8);
}

.column-list-section .container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 1024px) {
  .column-list-section .container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .column-list-section .container {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ---------- 記事カード ---------- */
.column-card {
  background: #FFFFFF;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(15, 31, 76, 0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.column-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(15, 31, 76, 0.12);
}

.column-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.column-card-image {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.column-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.column-card:hover .column-card-image img {
  transform: scale(1.05);
}

.column-card-category {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #FFFFFF;
  backdrop-filter: blur(4px);
}

.column-card-category.sales {
  background: rgba(37, 99, 235, 0.92);
}

.column-card-category.backoffice {
  background: rgba(16, 185, 129, 0.92);
}

.column-card-category.management {
  background: rgba(15, 31, 76, 0.92);
}

.column-card-body {
  padding: 24px;
}

.column-card-date {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-muted, #6B7280);
  margin-bottom: 12px;
}

.column-card-title {
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: 1.55;
  color: var(--color-navy, #0F1F4C);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
  /* 2行で省略 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.column-card-excerpt {
  font-size: 0.8125rem;
  color: var(--color-text-muted, #6B7280);
  line-height: 1.75;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.column-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border, #E5E7EB);
  font-size: 0.6875rem;
  color: var(--color-text-muted, #6B7280);
}

.column-card-author::before {
  content: "✎ ";
}

.column-card-readtime::before {
  content: "⏱ ";
}

/* ---------- 空状態 ---------- */
.column-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 0;
  color: var(--color-text-muted, #6B7280);
}


/* ============================================
  記事個別ページ
============================================ */

.article-hero {
  background: #FFFFFF;
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--color-border, #E5E7EB);
}

.article-hero .container {
  max-width: 800px;
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.article-category {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #FFFFFF;
}

.article-category.sales { background: var(--color-blue, #2563EB); }
.article-category.backoffice { background: var(--color-teal-500, #10B981); }
.article-category.management { background: var(--color-navy, #0F1F4C); }

.article-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.8125rem;
  color: var(--color-text-muted, #6B7280);
  letter-spacing: 0.05em;
}

.article-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--color-navy, #0F1F4C);
  letter-spacing: 0.02em;
  margin-bottom: 32px;
}

.article-lead {
  font-size: 1rem;
  color: var(--color-text-muted, #6B7280);
  line-height: 1.95;
  padding: 20px 24px;
  background: var(--color-bg-soft, #F5F6F8);
  border-left: 3px solid var(--color-blue, #2563EB);
  border-radius: 0 8px 8px 0;
  margin-bottom: 32px;
}

.article-author-strip {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--color-border, #E5E7EB);
}

.article-author-photo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  overflow: hidden;
  background: #1F2937;
  flex-shrink: 0;
  border: 2px solid #FFFFFF;
  outline: 1px solid var(--color-border, #E5E7EB);
}

.article-author-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 15%;
}

.article-author-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.article-author-role {
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted, #6B7280);
}

.article-author-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-navy, #0F1F4C);
}

.article-readtime {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--color-text-muted, #6B7280);
}

.article-readtime::before {
  content: "⏱ ";
}

@media (max-width: 768px) {
  .article-hero {
    padding: 48px 0 32px;
  }
  .article-title {
    font-size: 1.5rem;
  }
  .article-lead {
    font-size: 0.875rem;
    padding: 16px 20px;
  }
}

/* ---------- 記事本文 ---------- */
.article-body-section {
  padding: 64px 0 96px;
  background: #FFFFFF;
}

.article-body-section .container {
  max-width: 800px;
}

.article-body {
  font-size: 1rem;
  line-height: 2.0;
  color: var(--color-text, #1F2937);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-navy, #0F1F4C);
  margin: 56px 0 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-navy, #0F1F4C);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

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

.article-body h3 {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--color-navy, #0F1F4C);
  margin: 40px 0 16px;
  padding-left: 16px;
  border-left: 4px solid var(--color-blue, #2563EB);
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body strong {
  font-weight: 700;
  color: var(--color-navy, #0F1F4C);
  background: linear-gradient(transparent 65%, rgba(37, 99, 235, 0.15) 65%);
  padding: 0 2px;
}

.article-body ul,
.article-body ol {
  margin: 24px 0;
  padding-left: 0;
  list-style: none;
}

.article-body ul li {
  padding-left: 24px;
  position: relative;
  margin-bottom: 12px;
  line-height: 1.85;
}

.article-body ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 8px;
  background: var(--color-blue, #2563EB);
  border-radius: 50%;
}

.article-body ol {
  counter-reset: ol-counter;
}

.article-body ol li {
  padding-left: 36px;
  position: relative;
  margin-bottom: 12px;
  line-height: 1.85;
  counter-increment: ol-counter;
}

.article-body ol li::before {
  content: counter(ol-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  background: var(--color-blue, #2563EB);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
}

.article-body blockquote {
  margin: 32px 0;
  padding: 24px 28px;
  background: var(--color-bg-soft, #F5F6F8);
  border-left: 4px solid var(--color-blue, #2563EB);
  border-radius: 0 12px 12px 0;
  font-style: normal;
  color: var(--color-text, #1F2937);
}

.article-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 0.9375rem;
}

.article-body table th,
.article-body table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border, #E5E7EB);
}

.article-body table th {
  background: var(--color-bg-soft, #F5F6F8);
  font-weight: 700;
  color: var(--color-navy, #0F1F4C);
  font-size: 0.875rem;
}

.article-body a:not(.btn) {
  color: var(--color-blue, #2563EB);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:not(.btn):hover {
  text-decoration-thickness: 2px;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 32px 0;
}

/* 記事内CTAボックス */
.article-cta-box {
  margin: 48px 0;
  padding: 32px;
  background: linear-gradient(135deg, var(--color-navy, #0F1F4C) 0%, #1E3A8A 100%);
  border-radius: 16px;
  color: #FFFFFF;
  text-align: center;
}

.article-cta-box h4 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.article-cta-box p {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 20px;
}

.article-cta-box .btn {
  display: inline-flex;
}

@media (max-width: 768px) {
  .article-body {
    font-size: 0.9375rem;
    line-height: 1.95;
  }
  .article-body h2 {
    font-size: 1.25rem;
    margin: 40px 0 20px;
  }
  .article-body h3 {
    font-size: 1.0625rem;
    margin: 32px 0 14px;
  }
  .article-cta-box {
    padding: 24px;
  }
}

/* ---------- 関連記事 ---------- */
.article-related-section {
  padding: 64px 0;
  background: var(--color-bg-soft, #F5F6F8);
  border-top: 1px solid var(--color-border, #E5E7EB);
}

.article-related-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-navy, #0F1F4C);
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 900px) {
  .article-related-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 記事下CTA ---------- */
.article-bottom-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--color-navy, #0F1F4C) 0%, #1E3A8A 100%);
  color: #FFFFFF;
  text-align: center;
}

.article-bottom-cta h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.article-bottom-cta p {
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  font-size: 0.9375rem;
  line-height: 1.85;
}

.article-bottom-cta .cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .article-bottom-cta {
    padding: 56px 0;
  }
  .article-bottom-cta h3 {
    font-size: 1.25rem;
  }
}

/* ---------- 戻るリンク ---------- */
.article-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-blue, #2563EB);
  text-decoration: none;
  padding: 12px 20px;
  border: 1px solid var(--color-border, #E5E7EB);
  border-radius: 999px;
  transition: all 0.2s ease;
  background: #FFFFFF;
}

.article-back-link:hover {
  background: var(--color-blue, #2563EB);
  color: #FFFFFF;
  border-color: var(--color-blue, #2563EB);
}