/* 記事一覧・詳細ページ */
:root {
  --bg-color: #ffffff;
  --bg-subtle: #f7f8fa;
  --text-color: #1a1a1a;
  --text-muted: #5c5c5c;
  --text-light: #888888;
  --primary-color: #2c5282;
  --primary-light: #ebf2fa;
  --secondary-color: #777777;
  --border-color: #e4e7ec;
  --border-strong: #d0d5dd;
  --container-width: 1140px;
  --article-width: 680px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 16px;
  line-height: 1.85;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  z-index: 1000;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.main-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--primary-color);
  background: var(--primary-light);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-align: center;
  color: var(--text-color);
  letter-spacing: 0.04em;
}

.page-intro {
  text-align: center;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.9;
  font-size: 0.95rem;
}

/* Main */
.main-content {
  padding-top: 120px;
  flex: 1;
  padding-bottom: 60px;
  background-color: var(--bg-color);
}

/* Breadcrumb */
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin-bottom: 36px;
  font-size: 0.82rem;
  max-width: var(--article-width);
  margin-left: auto;
  margin-right: auto;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  margin-left: 8px;
  color: #aaa;
}

.breadcrumb-item a {
  color: var(--secondary-color);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: var(--primary-color);
}

.breadcrumb-item.is-current {
  color: var(--text-color);
}

/* Category filter */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
  justify-content: center;
}

.category-filter a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 50px;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s ease;
  background: #fff;
}

.category-filter a:hover,
.category-filter a.is-active {
  background: var(--primary-light);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Article grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.article-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--bg-subtle);
}

.article-card-thumb--empty {
  background: var(--bg-subtle);
}

.article-card-body {
  padding: 22px 20px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.article-card h3 {
  font-size: 1.05rem;
  line-height: 1.55;
  margin-bottom: 8px;
  color: var(--text-color);
  font-weight: 700;
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 14px;
  flex: 1;
}

.article-card-date {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* Article detail */
.article-detail {
  max-width: var(--article-width);
  margin: 0 auto;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 20px;
  font-size: 0.82rem;
  color: var(--text-light);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
}

.article-meta-item + .article-meta-item::before {
  content: '·';
  margin: 0 10px;
  color: #ccc;
  font-weight: 400;
}

.article-category {
  display: inline;
  font-size: inherit;
  font-weight: 600;
  color: var(--primary-color);
  background: none;
  border: none;
  padding: 0;
  border-radius: 0;
  text-decoration: none;
}

.article-category:hover {
  text-decoration: underline;
  background: none;
}

.article-status-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 3px;
}

.article-status-badge--draft {
  color: #8a6d00;
  background: #fef9e7;
  border: 1px solid #f0e0a0;
}

.preview-banner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1100;
  padding: 10px 20px;
  background: #fef9e7;
  border-bottom: 1px solid #f0e0a0;
  color: #8a6d00;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

body.has-preview-banner .main-header {
  top: 40px;
}

body.has-preview-banner .main-content {
  padding-top: 160px;
}

.article-detail-title {
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  line-height: 1.45;
  margin-bottom: 16px;
  color: var(--text-color);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.article-lead {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.article-eyecatch-wrap {
  margin: 28px 0 0;
}

.article-eyecatch {
  width: 100%;
  border-radius: 4px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-top: 4px;
}

.article-tag {
  font-size: 0.82rem;
  padding: 0;
  border-radius: 0;
  background: none;
  border: none;
  color: var(--text-light);
  text-decoration: none;
}

.article-tag:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* 本文 */
.article-body {
  font-size: 1rem;
  line-height: 2;
  color: #333;
  letter-spacing: 0.02em;
}

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

.article-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-color);
  margin: 3em 0 1em;
  padding: 1.25em 0 0;
  border-top: 1px solid var(--border-strong);
  line-height: 1.5;
  letter-spacing: 0.03em;
}

.article-body h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.article-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-color);
  margin: 2em 0 0.75em;
  padding-left: 12px;
  border-left: 3px solid var(--primary-color);
  line-height: 1.5;
}

.article-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-color);
  margin: 1.75em 0 0.6em;
  line-height: 1.5;
}

.article-body p {
  margin-bottom: 1.5em;
}

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

.article-body ul,
.article-body ol {
  margin: 0 0 1.5em;
  padding-left: 1.4em;
}

.article-body li {
  margin-bottom: 0.5em;
}

.article-body li::marker {
  color: var(--primary-color);
}

.article-body a {
  color: var(--primary-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-body a:hover {
  color: #1a365d;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 2em 0;
  display: block;
}

.article-body blockquote {
  border-left: 3px solid var(--border-strong);
  padding: 4px 0 4px 20px;
  margin: 2em 0;
  background: none;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2.5em 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-size: 0.92rem;
}

.article-body th,
.article-body td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

.article-body th {
  background: var(--bg-subtle);
  font-weight: 600;
}

.article-body strong {
  font-weight: 700;
  color: var(--text-color);
}

/* 著者 */
.authors-section {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 2px solid var(--border-color);
}

.authors-section-title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-light);
  letter-spacing: 0.06em;
}

.author-card {
  background: none;
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: 0;
  padding: 0 0 24px;
  margin-bottom: 24px;
}

.author-card:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.author-card-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 12px;
}

.author-card-inner {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.author-card-photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-card-photo--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  color: #bbb;
  font-size: 1.25rem;
}

.author-card-sns {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--primary-color);
  text-decoration: none;
}

.author-card-name {
  font-size: 1rem;
  margin-bottom: 2px;
  color: var(--text-color);
  font-weight: 700;
}

.author-card-role,
.author-card-qualification {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.author-card-profile {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-top: 10px;
  color: var(--text-muted);
}

/* 関連記事 */
.related-articles {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 2px solid var(--border-color);
  max-width: var(--article-width);
  margin-left: auto;
  margin-right: auto;
}

.related-articles h2 {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
  text-align: left;
  color: var(--text-light);
  letter-spacing: 0.06em;
}

.article-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.back-link:hover {
  color: var(--primary-color);
  text-decoration: none;
}

/* Status messages */
.articles-loading,
.articles-coming-soon,
.articles-empty,
.articles-error {
  text-align: center;
  padding: 40px 24px;
  border-radius: 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
}

.articles-coming-soon-main {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-color);
}

.articles-coming-soon-main i {
  color: #e6a800;
}

.articles-loading {
  color: var(--secondary-color);
}

.articles-empty-sub {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.articles-error {
  color: #c62828;
}

.articles-error a {
  color: var(--primary-color);
}

/* Footer */
footer {
  padding: 30px 0;
  background-color: var(--bg-subtle);
  text-align: center;
  border-top: 1px solid var(--border-color);
}

footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 10px;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 10px;
}

footer a:hover {
  color: var(--text-color);
}

footer span {
  color: #bbb;
}

@media (max-width: 768px) {
  .page-title {
    font-size: 1.8rem;
  }

  .nav-links {
    display: none;
  }

  .author-card-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .author-card-sns {
    justify-content: center;
  }
}