:root {
  color-scheme: light;
  --column-bg: #f5f2ea;
  --column-paper: #fffdf8;
  --column-ink: #25231f;
  --column-muted: #686257;
  --column-line: #d9d1c3;
  --column-accent: #a14f2a;
  --column-accent-dark: #71371f;
  --column-sage: #dce1d5;
  --column-width: 1120px;
  --column-reading: 780px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.column-page {
  margin: 0;
  min-width: 320px;
  background: var(--column-bg);
  color: var(--column-ink);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

.column-page a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.column-page a:focus-visible,
.column-page [tabindex="0"]:focus-visible {
  outline: 3px solid #d58a61;
  outline-offset: 4px;
}

.column-container {
  width: min(calc(100% - 40px), var(--column-width));
  margin-inline: auto;
}

.column-skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 16px;
  background: var(--column-ink);
  color: #fff;
  transform: translateY(-150%);
}

.column-skip-link:focus {
  transform: translateY(0);
}

.column-site-header {
  border-bottom: 1px solid var(--column-line);
  background: rgba(255, 253, 248, 0.96);
}

.column-site-header__inner {
  width: min(calc(100% - 40px), var(--column-width));
  min-height: 76px;
  margin-inline: auto;
  display: flex;
  align-items: center;
}

.column-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--column-ink);
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-weight: 700;
  line-height: 1.35;
  text-decoration: none;
  letter-spacing: 0.03em;
}

.column-brand small {
  display: block;
  color: var(--column-muted);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.column-brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--column-accent);
  color: var(--column-accent-dark);
  font-size: 20px;
}

.column-main {
  min-height: 70vh;
}

.column-kicker {
  margin: 0 0 14px;
  color: var(--column-accent-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.column-index-hero {
  padding-block: clamp(64px, 9vw, 112px) clamp(44px, 6vw, 72px);
  border-bottom: 1px solid var(--column-line);
}

.column-index-hero h1,
.column-article-hero h1 {
  margin: 0;
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-weight: 700;
  letter-spacing: 0.015em;
  line-height: 1.35;
}

.column-index-hero h1 {
  max-width: 820px;
  font-size: clamp(32px, 5.2vw, 60px);
}

.column-lead {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--column-muted);
  font-size: clamp(16px, 2vw, 19px);
}

.column-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  padding-block: clamp(48px, 7vw, 88px);
}

.column-card {
  overflow: hidden;
  border: 1px solid var(--column-line);
  background: var(--column-paper);
  box-shadow: 0 14px 38px rgba(58, 48, 36, 0.06);
}

.column-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid var(--column-line);
}

.column-card__body {
  padding: clamp(24px, 4vw, 38px);
}

.column-card h2 {
  margin: 0;
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: clamp(23px, 3vw, 32px);
  line-height: 1.5;
}

.column-card h2 a {
  text-decoration: none;
}

.column-card h2 a::after {
  position: absolute;
  inset: 0;
  content: "";
}

.column-card {
  position: relative;
}

.column-card__body > p:not(.column-kicker) {
  margin: 18px 0 0;
  color: var(--column-muted);
}

.column-card__read-more {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 24px;
  color: var(--column-accent-dark);
  font-size: 14px;
  font-weight: 700;
}

.column-card__read-more span {
  transition: transform 160ms ease;
}

.column-card:hover .column-card__read-more span {
  transform: translateX(4px);
}

.column-breadcrumb {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding-block: 22px;
  overflow: hidden;
  color: var(--column-muted);
  font-size: 12px;
  white-space: nowrap;
}

.column-breadcrumb > span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
}

.column-article {
  width: min(calc(100% - 40px), var(--column-reading));
}

.column-article-hero {
  padding-block: clamp(36px, 6vw, 68px) 44px;
}

.column-article-hero h1 {
  font-size: clamp(31px, 5.2vw, 52px);
}

.column-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 20px;
  color: var(--column-muted);
  font-size: 12px;
}

.column-article-visual {
  margin: 36px 0 0;
}

.column-article-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--column-line);
}

.column-article-body {
  padding: clamp(34px, 6vw, 64px);
  border: 1px solid var(--column-line);
  background: var(--column-paper);
}

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

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

.column-article-body p {
  margin: 0 0 1.5em;
}

.column-article-body h2 {
  margin: 2.5em 0 0.85em;
  padding-bottom: 0.45em;
  border-bottom: 1px solid var(--column-line);
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.5;
}

.column-article-body h3 {
  margin: 2em 0 0.7em;
  color: var(--column-accent-dark);
  font-size: clamp(19px, 3vw, 23px);
  line-height: 1.55;
}

.column-article-body ul,
.column-article-body ol {
  margin: 0 0 1.7em;
  padding-left: 1.4em;
}

.column-article-body li + li {
  margin-top: 0.55em;
}

.column-article-body strong {
  color: var(--column-accent-dark);
}

.column-article-body img {
  width: 100%;
  margin-block: 22px 28px;
  border: 1px solid var(--column-line);
}

.column-article-body table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}

.column-article-body th,
.column-article-body td {
  padding: 14px 16px;
  border: 1px solid var(--column-line);
  text-align: left;
  vertical-align: top;
}

.column-article-body th {
  background: #eee9dd;
  font-weight: 700;
}

.column-table-wrap {
  margin-block: 26px 34px;
  overflow-x: auto;
  border-inline: 1px solid transparent;
  -webkit-overflow-scrolling: touch;
}

.column-lp-cta {
  margin-top: 36px;
  padding: clamp(28px, 5vw, 44px);
  border: 1px solid var(--column-ink);
  background: var(--column-ink);
  color: var(--column-paper);
}

.column-lp-cta h2 {
  margin: 0;
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: clamp(23px, 3.4vw, 30px);
  line-height: 1.55;
}

.column-lp-cta p {
  margin: 12px 0 0;
  color: #e5ded1;
}

.column-page .column-lp-cta__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  margin-top: 24px;
  padding: 12px 24px;
  border: 1px solid var(--column-paper);
  background: var(--column-paper);
  color: var(--column-ink);
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}
.column-area-guides,
.column-sources {
  margin-top: 36px;
  padding: clamp(28px, 5vw, 44px);
  border: 1px solid var(--column-line);
}

.column-area-guides {
  background: var(--column-sage);
}

.column-sources {
  margin-bottom: clamp(64px, 9vw, 104px);
  background: rgba(255, 253, 248, 0.58);
}

.column-area-guides h2,
.column-sources h2 {
  margin: 0;
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: clamp(23px, 3.4vw, 30px);
}

.column-area-guides > p {
  margin: 10px 0 0;
  color: var(--column-muted);
}

.column-area-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.column-area-list a {
  display: block;
  padding: 11px 0;
  border-bottom: 1px solid rgba(37, 35, 31, 0.2);
  color: var(--column-accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.column-area-list a::after {
  float: right;
  content: "→";
}

.column-sources ul {
  margin: 18px 0 0;
  padding-left: 1.2em;
  color: var(--column-muted);
  font-size: 14px;
}

.column-footer {
  border-top: 1px solid var(--column-line);
  background: #2b2925;
  color: #f4efe4;
}

.column-footer .column-container {
  display: flex;
  gap: 28px;
  align-items: baseline;
  justify-content: space-between;
  padding-block: 34px;
}

.column-footer a {
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-weight: 700;
}

.column-footer p {
  margin: 0;
  color: #c9c1b4;
  font-size: 12px;
  text-align: right;
}

@media (max-width: 720px) {
  .column-container,
  .column-article,
  .column-site-header__inner {
    width: min(calc(100% - 32px), var(--column-width));
  }

  .column-site-header__inner {
    min-height: 68px;
  }

  .column-brand__mark {
    width: 38px;
    height: 38px;
  }

  .column-card-grid,
  .column-area-list {
    grid-template-columns: 1fr;
  }

  .column-card-grid {
    gap: 22px;
  }

  .column-article-body {
    padding: 28px 22px;
  }

  .column-article-body table {
    min-width: 560px;
  }

  .column-lp-cta__button {
    width: 100%;
  }

  .column-breadcrumb {
    padding-block: 16px;
  }

  .column-footer .column-container {
    display: block;
  }

  .column-footer p {
    margin-top: 8px;
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .column-card__read-more span {
    transition: none;
  }
}