/* ==========================================================================
   NEWS PORTAL（仮） 共通スタイル（業務用ツール風UI）
   ========================================================================== */

:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-row-hover: #f0f2f5;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #d0d5dd;
  --color-primary: #1f4e8c;
  --color-primary-dark: #17396a;
  --color-danger: #c0392b;
  --color-danger-dark: #a5311f;
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --radius: 3px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- ヘッダー（アプリバー） ---------- */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  padding: 0.55rem 1.25rem;
}

.brand {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

.site-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--color-text);
}

.site-title .tentative {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 400;
  margin-left: 0.25em;
}

.site-date {
  margin: 0;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.site-nav {
  border-top: 1px solid var(--color-border);
  overflow-x: auto;
}

.nav-list {
  display: flex;
  gap: 0;
  padding: 0 1.25rem;
  max-width: 1120px;
  margin: 0 auto;
}

.nav-link {
  display: inline-block;
  padding: 0.55rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-row-hover);
}

.nav-link.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---------- レイアウト ---------- */

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding: 1.5rem 1.25rem 3rem;
}

.content {
  min-width: 0;
}

.section-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.category-count {
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-left: 0.35em;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }
}

/* ---------- カテゴリバッジ ---------- */

.category-badge {
  display: inline-block;
  flex: 0 0 auto;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
  background: #eef2f8;
  border: 1px solid #c7d5e8;
  border-radius: 2px;
  padding: 0.1rem 0.45rem;
}

.category-badge[data-category="国内"] {
  color: #1e40af;
  background: #eef2ff;
  border-color: #c7d2fe;
}

.category-badge[data-category="国際"] {
  color: #0e7490;
  background: #ecfeff;
  border-color: #a5f3fc;
}

.category-badge[data-category="経済"] {
  color: #15803d;
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.category-badge[data-category="テクノロジー"] {
  color: #6d28d9;
  background: #f5f3ff;
  border-color: #ddd6fe;
}

.category-badge[data-category="スポーツ"] {
  color: #c2410c;
  background: #fff7ed;
  border-color: #fed7aa;
}

.category-badge[data-category="文化"] {
  color: #be185d;
  background: #fdf2f8;
  border-color: #fbcfe8;
}

/* ---------- 記事リスト（罫線区切りの行） ---------- */

.article-list {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.article-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  column-gap: 0.75rem;
  row-gap: 0.2rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

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

.article-row:hover {
  background: var(--color-row-hover);
}

.article-row-date {
  flex: 0 0 auto;
  width: 5.6em;
  font-size: 0.76rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.article-row-title {
  flex: 1 1 260px;
  min-width: 120px;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.article-row-lead {
  flex: 1 1 100%;
  margin-left: calc(5.6em + 0.75rem);
  font-size: 0.78rem;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.latest-label {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  border-radius: 2px;
  padding: 0.05rem 0.35rem;
  margin-right: 0.4rem;
  vertical-align: middle;
}

.empty-message {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

/* ---------- サイドバー ---------- */

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.widget {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.widget-title {
  margin: 0;
  padding: 0.5rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-text);
  background: #eef0f3;
  border-bottom: 1px solid var(--color-border);
}

.ranking-list {
  padding: 0.25rem 0.9rem 0.4rem;
}

.ranking-list li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.85rem;
}

.ranking-list li:last-child {
  border-bottom: none;
}

.ranking-list a:hover {
  color: var(--color-primary);
}

.rank-number {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--color-primary);
  min-width: 1.4em;
  font-variant-numeric: tabular-nums;
}

.category-list {
  padding: 0.2rem 0.9rem 0.35rem;
}

.category-list li {
  border-bottom: 1px solid var(--color-border);
}

.category-list li:last-child {
  border-bottom: none;
}

.category-list a {
  display: block;
  padding: 0.5rem 0.1rem;
  font-size: 0.85rem;
}

.category-list a:hover {
  color: var(--color-primary);
}

/* ---------- 記事詳細ページ ---------- */

.article-detail {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.breadcrumb {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 0.9rem;
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  margin: 0 0.4em;
  color: var(--color-text-muted);
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 0.7rem;
}

.article-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 1.2rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

.article-meta-row time {
  font-variant-numeric: tabular-nums;
}

.article-id {
  font-variant-numeric: tabular-nums;
}

.article-body p {
  margin: 0 0 1.1rem;
  font-size: 0.92rem;
}

.not-found {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.not-found a {
  color: var(--color-primary);
  font-weight: 700;
}

/* ---------- サイト概要ページ ---------- */

.prose {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem 1.75rem 2rem;
  max-width: 720px;
  margin: 0 auto;
}

.prose h2 {
  font-size: 1rem;
  margin: 1.5rem 0 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

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

.prose p {
  margin: 0 0 0.9rem;
}

.prose ul {
  list-style: disc;
  padding-left: 1.4rem;
  margin: 0 0 0.9rem;
}

.prose li {
  margin-bottom: 0.35rem;
}

/* ---------- フッター ---------- */

.site-footer {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

.footer-inner {
  padding: 1.25rem;
  text-align: center;
}

.footer-brand {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-text);
  margin: 0 0 0.5rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 0.6rem;
  font-size: 0.82rem;
}

.footer-nav a:hover {
  color: var(--color-primary);
}

.footer-copy {
  font-size: 0.75rem;
  margin: 0 0 0.3rem;
}

.footer-note {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  opacity: 0.8;
  margin: 0;
}