@font-face {
  font-family: "Klee Sub";
  src: url("/styles/klee-subset.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}

:root {
  --ground: #f1f1ee;
  --ink: #2a2d34;
  --ink-soft: #62666f;
  --night: #2e3a59;
  --night-deep: #232c45;
  --wisteria: #8c80b0;
  --dawn: #f2d3b6;
  --line: #d6d5d0;
  --dusk: linear-gradient(90deg, var(--dawn) 0%, var(--wisteria) 55%, var(--night) 100%);
  --hand: "Klee Sub", "Klee One", "UD デジタル 教科書体 N-B", "UD Digi Kyokasho N-B", "YuKyokasho", sans-serif;
  --text: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--text);
  font-size: 16px;
  line-height: 2.05;
  letter-spacing: 0.04em;
  font-feature-settings: "palt" 0;
}

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

a { color: var(--night); text-underline-offset: 0.25em; text-decoration-thickness: 1px; }
a:hover { color: var(--wisteria); }

:focus-visible { outline: 2px solid var(--wisteria); outline-offset: 3px; }

[data-ui="skip"] {
  position: absolute; left: -9999px; top: 0;
  background: var(--night); color: #fff; padding: 8px 16px;
}
[data-ui="skip"]:focus { left: 16px; }

/* ヘッダー：夜藍の帯と、朝→夜のグラデーション線 */
[data-ui="masthead"] {
  background: var(--night);
  color: #f4f2ee;
  position: relative;
}
[data-ui="masthead"]::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--dusk);
}
[data-ui="masthead-inner"] {
  max-width: 980px;
  margin: 0 auto;
  padding: 26px 20px 28px;
}
[data-ui="masthead-name"] {
  margin: 0;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 1.4;
  letter-spacing: 0.08em;
}
[data-ui="masthead-name"] a { color: inherit; text-decoration: none; }
[data-ui="masthead-catch"] {
  margin: 6px 0 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: #c9c6d9;
  letter-spacing: 0.12em;
}

[data-ui="frame"] {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}

/* TOP：番組表のような縦のタイムライン */
[data-ui="lead"] {
  max-width: 760px;
  margin: 48px auto 8px;
  padding-left: 40px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

[data-ui="timeline"] {
  list-style: none;
  max-width: 760px;
  margin: 24px auto 72px;
  padding: 8px 0 8px 40px;
  position: relative;
}
[data-ui="timeline"]::before {
  content: "";
  position: absolute; left: 11px; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--dawn), var(--wisteria) 50%, var(--night));
}
[data-ui="timeline-item"] {
  position: relative;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: start;
  padding: 0 0 56px;
}
[data-ui="timeline-item"]:last-child { padding-bottom: 8px; }
[data-ui="timeline-item"]::before {
  /* 半月の印 */
  content: "";
  position: absolute; left: -37px; top: 6px;
  width: 15px; height: 15px;
  border-radius: 50%;
  border: 1px solid var(--night);
  background: linear-gradient(90deg, var(--ground) 50%, var(--night) 50%);
}
[data-ui="tl-media"] { display: block; text-decoration: none; }
[data-ui="tl-date"] {
  display: block;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
}
[data-ui="tl-title"] {
  margin: 6px 0 10px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.6;
  letter-spacing: 0.05em;
}
[data-ui="tl-title"] a { color: var(--ink); text-decoration: none; }
[data-ui="tl-title"] a:hover { color: var(--night); text-decoration: underline; }
[data-ui="tl-excerpt"] {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.9;
  color: var(--ink-soft);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 画像のアーチ形 */
[data-ui="arch"] {
  border-radius: 50% 50% 0 0 / 30% 30% 0 0;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: var(--line);
}
[data-ui="arch"] img { width: 100%; height: 100%; object-fit: cover; }

/* 写真のない記事のアイキャッチ（文字と色） */
[data-ui="textcard"] {
  display: flex;
  align-items: flex-end;
  height: 100%;
  padding: 10% 9% 9%;
  background: linear-gradient(160deg, var(--dawn) 0%, #c7b9cf 38%, var(--wisteria) 62%, var(--night) 100%);
  color: #fff;
  font-family: var(--hand);
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0.06em;
  font-size: clamp(0.9rem, 3.4vw, 1.5rem);
}
[data-ui="tl-media"] [data-ui="textcard"],
[data-ui="related-item"] [data-ui="textcard"] { font-size: 0.85rem; }

/* パンくず */
[data-ui="crumbs"] {
  margin: 28px 0 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-soft);
}
[data-ui="crumbs"] ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; }
[data-ui="crumbs"] li + li::before { content: "〉"; margin: 0 0.5em; color: var(--wisteria); }

/* 記事ページ：PCでは左に追従する目次 */
[data-ui="story"] {
  display: grid;
  grid-template-columns: minmax(0, 680px);
  justify-content: center;
  padding-bottom: 64px;
}
[data-ui="story-side"] { display: none; }

@media (min-width: 1040px) {
  [data-ui="story"] {
    grid-template-columns: 220px minmax(0, 680px);
    column-gap: 56px;
  }
  [data-ui="story-side"] { display: block; }
  [data-ui="story-side"] > nav {
    position: sticky;
    top: 28px;
    margin-top: 150px;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
  }
  [data-ui="toc-fold"] { display: none; }
}

[data-ui="story-date"] {
  display: block;
  margin: 28px 0 0;
  font-size: 0.8rem;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
}
[data-ui="story-title"] {
  margin: 8px 0 28px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.75rem;
  line-height: 1.55;
  letter-spacing: 0.05em;
}
[data-ui="story-eye"] { max-width: 640px; margin: 0 auto; }

/* 目次 */
[data-ui="toc-label"] {
  margin: 0 0 10px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  color: var(--night);
}
[data-ui="toc-list"] {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  position: relative;
  font-size: 0.84rem;
  line-height: 1.6;
}
[data-ui="toc-list"]::before {
  content: "";
  position: absolute; left: 3px; top: 8px; bottom: 8px;
  width: 1px;
  background: var(--line);
}
[data-ui="toc-list"] li { position: relative; padding: 5px 0; }
[data-ui="toc-list"] li::before {
  content: "";
  position: absolute; left: -18px; top: 12px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--wisteria);
}
[data-ui="toc-list"] a { color: var(--ink); text-decoration: none; }
[data-ui="toc-list"] a:hover { color: var(--night); text-decoration: underline; }

[data-ui="toc-fold"] {
  margin: 32px 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}
[data-ui="toc-fold"] summary {
  cursor: pointer;
  padding: 10px 0;
  font-family: var(--hand);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--night);
}
[data-ui="toc-fold"] [data-ui="toc-list"] { margin: 4px 0 14px; }

/* 本文 */
[data-ui="story-body"] { margin-top: 40px; }
[data-ui="story-body"] p { margin: 0 0 1.5em; }
[data-ui="story-body"] h2 {
  position: relative;
  margin: 3.2em 0 1.1em;
  padding-left: 30px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.36rem;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--night-deep);
  scroll-margin-top: 20px;
}
[data-ui="story-body"] h2::before {
  content: "";
  position: absolute; left: 0; top: 0.42em;
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 1px solid var(--night);
  background: linear-gradient(90deg, var(--ground) 50%, var(--night) 50%);
}
[data-ui="story-body"] h2:first-child { margin-top: 0; }
[data-ui="story-body"] h3 {
  position: relative;
  margin: 2.2em 0 0.9em;
  padding-bottom: 8px;
  font-size: 1.06rem;
  line-height: 1.7;
  font-weight: 700;
}
[data-ui="story-body"] h3::after {
  content: "";
  position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--dusk);
}

/* 関連記事：2×2 */
[data-ui="related"] { margin-top: 72px; }
[data-ui="related-label"] {
  margin: 0 0 24px;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  color: var(--night);
}
[data-ui="related-grid"] {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 28px;
}
[data-ui="related-item"] a { display: block; color: var(--ink); text-decoration: none; }
[data-ui="related-item"] a:hover [data-ui="related-title"] { color: var(--night); text-decoration: underline; }
[data-ui="related-title"] {
  display: block;
  margin-top: 12px;
  font-size: 0.9rem;
  line-height: 1.7;
  font-weight: 700;
}

/* プライバシーポリシー */
[data-ui="doc"] { max-width: 680px; margin: 0 auto; padding-bottom: 72px; }
[data-ui="doc"] h2 {
  margin: 2.4em 0 0.6em;
  font-family: var(--hand);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--night-deep);
}
[data-ui="doc"] p, [data-ui="doc"] ul { margin: 0 0 1.3em; }
[data-ui="doc"] [data-ui="story-title"] { margin-top: 28px; }
[data-ui="doc-date"] { font-size: 0.85rem; color: var(--ink-soft); }

/* 404 */
[data-ui="missing"] { max-width: 680px; margin: 0 auto; padding: 56px 0 80px; }
[data-ui="missing"] [data-ui="timeline"] { margin: 32px 0 40px; }
[data-ui="missing"] [data-ui="timeline-item"] { display: block; padding-bottom: 20px; }
[data-ui="missing"] [data-ui="timeline-item"]::before { top: 8px; }

/* フッター */
[data-ui="footnote"] {
  background: var(--night);
  color: #dcd9e6;
  font-size: 0.82rem;
  line-height: 1.9;
  position: relative;
}
[data-ui="footnote"]::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--dusk);
}
[data-ui="footnote-inner"] {
  max-width: 980px;
  margin: 0 auto;
  padding: 36px 20px 28px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px 48px;
}
[data-ui="footnote-note"] { margin: 0; max-width: 620px; }
[data-ui="footnote"] a { color: #fff; }
[data-ui="footnote"] a:hover { color: var(--dawn); }
[data-ui="footnote-base"] {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: #aeb3c6;
}

/* スマホ */
@media (max-width: 640px) {
  body { font-size: 15.5px; line-height: 2; }
  [data-ui="masthead-inner"] { padding: 20px 16px 22px; }
  [data-ui="masthead-name"] { font-size: 1.3rem; }
  [data-ui="frame"] { padding: 0 16px; }
  [data-ui="lead"] { margin-top: 32px; padding-left: 28px; font-size: 0.95rem; }
  [data-ui="timeline"] { padding-left: 28px; margin-bottom: 56px; }
  [data-ui="timeline"]::before { left: 6px; }
  [data-ui="timeline-item"] { grid-template-columns: 1fr; gap: 14px; padding-bottom: 44px; }
  [data-ui="timeline-item"]::before { left: -29px; width: 13px; height: 13px; }
  [data-ui="story-title"] { font-size: 1.4rem; }
  [data-ui="story-body"] h2 { font-size: 1.2rem; padding-left: 26px; }
  [data-ui="related-grid"] { gap: 28px 16px; }
  [data-ui="related-title"] { font-size: 0.84rem; }
  [data-ui="footnote-inner"] { grid-template-columns: 1fr; padding: 32px 16px 24px; }
}