/* PIVOT 構造化インプット 共通スタイル
   読みやすさ最優先 / max 720px / 日本語フォント / ダークモード対応
*/

:root {
  --bg: #fafaf8;
  --bg-elevated: #ffffff;
  --text: #1a1a1a;
  --text-muted: #5a5a5a;
  --text-faint: #888;
  --border: #e5e5e3;
  --border-strong: #c8c8c5;
  --link: #0a4d8c;
  --link-hover: #0a6ec3;
  --quote-bg: #f3f1ec;
  --quote-border: #c5b78e;
  --code-bg: #f0eee8;
  --table-bg-alt: #f6f5f0;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15151a;
    --bg-elevated: #1d1d24;
    --text: #e5e5e3;
    --text-muted: #a8a8a8;
    --text-faint: #777;
    --border: #2c2c34;
    --border-strong: #3d3d47;
    --link: #6cb8ff;
    --link-hover: #99cfff;
    --quote-bg: #22222a;
    --quote-border: #8b7e5a;
    --code-bg: #25252d;
    --table-bg-alt: #1a1a20;
    --shadow: 0 1px 2px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.3);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "游ゴシック", "Yu Gothic", "Noto Sans JP",
               -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

article {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 96px;
}

/* ヘッダー */
header.article-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.breadcrumb {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 16px;
}

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

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

.cat-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  color: white;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

article h1 {
  font-size: 26px;
  line-height: 1.5;
  font-weight: 700;
  margin: 8px 0 16px;
  letter-spacing: 0.01em;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  align-items: center;
}

.meta .meta-item::before {
  content: "·";
  margin-right: 16px;
  color: var(--text-faint);
}

.meta .meta-item:first-child::before { content: ""; margin-right: 0; }

.meta a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.meta a:hover { border-bottom-color: var(--link); }

/* 本文 */
.body h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-strong);
  position: relative;
}

.body h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text);
}

.body h2 .anchor,
.body h3 .anchor {
  opacity: 0;
  margin-left: 8px;
  font-size: 0.7em;
  color: var(--text-faint);
  text-decoration: none;
  transition: opacity 0.15s;
}

.body h2:hover .anchor,
.body h3:hover .anchor { opacity: 1; }

.body p {
  margin: 12px 0;
}

.body ul, .body ol {
  margin: 12px 0;
  padding-left: 24px;
}

.body li {
  margin: 6px 0;
}

.body strong {
  color: var(--text);
  font-weight: 700;
  background: linear-gradient(transparent 60%, color-mix(in srgb, var(--quote-border) 50%, transparent) 60%);
  padding: 0 1px;
}

.body a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
}

.body a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

.body blockquote {
  margin: 20px 0;
  padding: 12px 20px;
  background: var(--quote-bg);
  border-left: 4px solid var(--quote-border);
  color: var(--text-muted);
  font-style: italic;
  border-radius: 0 6px 6px 0;
}

.body blockquote p { margin: 4px 0; }

.body code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SF Mono", Monaco, Consolas, monospace;
  font-size: 0.9em;
}

.body pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
}

.body pre code {
  background: none;
  padding: 0;
}

/* テーブル */
.body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
  background: var(--bg-elevated);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.body th {
  background: color-mix(in srgb, var(--quote-border) 25%, var(--bg-elevated));
  text-align: left;
  padding: 10px 14px;
  font-weight: 700;
  border-bottom: 2px solid var(--border-strong);
}

.body td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.body tr:nth-child(even) td {
  background: var(--table-bg-alt);
}

.body tr:last-child td { border-bottom: none; }

/* 区切り */
.body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

/* フッター */
footer.article-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-faint);
  text-align: center;
}

footer.article-footer a {
  color: var(--text-muted);
  text-decoration: none;
}

footer.article-footer a:hover { color: var(--link); }

/* スマホ */
@media (max-width: 600px) {
  body { font-size: 15px; }
  article { padding: 20px 16px 64px; }
  article h1 { font-size: 22px; }
  .body h2 { font-size: 18px; }
  .body h3 { font-size: 16px; }
  .body table { font-size: 13px; }
  .body th, .body td { padding: 8px 10px; }
}