:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --text: #222222;
  --text-sub: #595959;
  --border: #dcdfe3;
  --accent: #c8102e;
  --accent-soft: #fdecef;
  --link: #0057a3;
}

html[data-theme="dark"] {
  --bg: #121212;
  --surface: #1d1d1d;
  --text: #e8e8e8;
  --text-sub: #aaaaaa;
  --border: #3a3a3a;
  --accent: #ff5d6c;
  --accent-soft: #2a1a1c;
  --link: #6cb4ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

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

.icon {
  width: 1.2em;
  height: 1.2em;
  flex: none;
  vertical-align: -0.2em;
}

/* ヘッダー */
.site-header {
  background: var(--surface);
  border-bottom: 3px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-row {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
}

.logo small {
  display: block;
  font-size: 0.65rem;
  color: var(--text-sub);
  font-weight: 500;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
}

.theme-icon-moon { display: none; }
html[data-theme="dark"] .theme-icon-sun { display: none; }
html[data-theme="dark"] .theme-icon-moon { display: block; }

.date-bar {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-sub);
  padding: 12px 16px 0;
}

main {
  display: block;
}

.grid-2 {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 16px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.col-main, .col-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.panel-title {
  font-size: 1rem;
  font-weight: 800;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.panel-note {
  font-size: 0.78rem;
  color: var(--text-sub);
  margin: 8px 0 0;
}

.empty-state {
  color: var(--text-sub);
  font-size: 0.9rem;
  padding: 8px 0;
}

/* 見出し行（リンク） */
.headline-row {
  display: flex;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

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

.headline-thumb {
  flex: none;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.headline-thumb .icon {
  width: 1.4em;
  height: 1.4em;
}

.headline-title {
  font-size: 0.95rem;
  color: var(--link);
  font-weight: 600;
  margin: 0 0 4px;
}

.headline-meta {
  font-size: 0.78rem;
  color: var(--text-sub);
  margin: 0;
}

.topic-tag {
  display: inline-block;
  background: var(--accent);
  color: white;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 3px;
  margin-right: 6px;
}

/* カテゴリーチップ */
.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--bg);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.category-pill.is-empty {
  opacity: 0.45;
}

/* ランキング・新着 */
.ranking-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

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

.rank-num {
  flex: none;
  font-weight: 800;
  color: var(--accent);
  font-size: 1rem;
  width: 22px;
}

.rank-title {
  font-size: 0.88rem;
  color: var(--link);
  font-weight: 600;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 2fr 1fr;
  }
}

/* 記事詳細ページ */
.article-detail {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.article-detail h1 {
  font-size: 1.5rem;
  margin: 12px 0;
}

.article-meta {
  color: var(--text-sub);
  font-size: 0.9rem;
}

.article-summary {
  font-size: 1.02rem;
}

.article-source {
  margin-top: 24px;
  font-size: 0.9rem;
}

.back-link {
  margin-top: 32px;
}

.back-link a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--link);
  font-weight: 600;
}

.site-footer {
  text-align: center;
  color: var(--text-sub);
  font-size: 0.78rem;
  padding: 24px 16px 40px;
}

/* フォーカス可視化（アクセシビリティ） */
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}