:root {
  --column-serif: "Yu Mincho", "Hiragino Mincho ProN", "Hiragino Mincho Pro", "Noto Serif JP", serif;
  --column-paper: #fffdfa;
  --column-cream: #f6f2e9;
  --column-mist: #edf3f1;
  --column-gold-line: rgba(188, 142, 50, 0.48);
  --column-reading: 760px;
}

.column-page {
  background: var(--column-paper);
}

.column-page .site-header {
  background: rgba(255, 253, 250, 0.96);
}

.column-page .desktop-nav a[aria-current="page"] {
  color: var(--green);
}

.column-page .desktop-nav .column-header-cta {
  margin-left: 2px;
  padding: 9px 16px;
  border-radius: 4px;
  color: var(--white);
  background: var(--green);
}

.column-page .desktop-nav .column-header-cta::after {
  display: none;
}

.column-page main {
  overflow: hidden;
}

.column-page .section-kicker {
  color: var(--gold);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}

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

.column-hero {
  position: relative;
  padding: clamp(78px, 10vw, 132px) 0 clamp(70px, 9vw, 116px);
  background:
    radial-gradient(circle at 82% 30%, rgba(44, 129, 167, 0.12), transparent 23rem),
    linear-gradient(125deg, var(--column-paper) 0%, #f8f5ef 46%, var(--column-mist) 100%);
}

.column-hero::after {
  position: absolute;
  right: clamp(20px, 8vw, 130px);
  bottom: 0;
  width: min(34vw, 420px);
  height: 1px;
  content: "";
  background: var(--column-gold-line);
}

.column-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: clamp(50px, 8vw, 110px);
  align-items: end;
}

.column-hero-copy {
  max-width: 800px;
}

.column-hero h1 {
  max-width: 14em;
  margin: 15px 0 28px;
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: clamp(2.45rem, 4.5vw, 4.05rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.16;
}

.column-hero-last-phrase {
  white-space: nowrap;
}

.column-hero-copy > p:last-child {
  max-width: 660px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.25vw, 1.1rem);
  line-height: 2;
}

.column-hero-note {
  border-top: 1px solid var(--column-gold-line);
  border-bottom: 1px solid var(--column-gold-line);
  padding: 25px 0 27px;
}

.column-hero-note strong {
  color: var(--green);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.5rem, 6vw, 5.6rem);
  font-weight: 400;
  line-height: 0.95;
}

.column-hero-note > span {
  margin-left: 8px;
  color: var(--navy);
  font-size: 0.84rem;
  font-weight: 800;
}

.column-hero-note p {
  margin: 17px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.8;
}

.column-start {
  padding-top: clamp(74px, 9vw, 116px);
  padding-bottom: clamp(80px, 10vw, 132px);
}

.column-section-head {
  max-width: 760px;
  margin-bottom: 36px;
}

.column-section-head h2,
.column-library-head h2,
.article-category-head h2,
.column-contact-band h2,
.article-side-consult h2 {
  margin: 8px 0 12px;
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: clamp(1.9rem, 3.5vw, 3rem);
  font-weight: 700;
  line-height: 1.35;
}

.column-section-head > p:last-child,
.article-category-head > p,
.column-library-head > p {
  color: var(--muted);
}

.featured-article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--column-gold-line);
  border-bottom: 1px solid var(--column-gold-line);
}

.article-card {
  min-width: 0;
}

.featured-article-grid .article-card {
  border-left: 1px solid rgba(18, 46, 89, 0.14);
}

.featured-article-grid .article-card:first-child {
  border-left: 0;
}

.article-card > a {
  position: relative;
  display: flex;
  height: 100%;
  min-height: 315px;
  flex-direction: column;
  padding: 30px;
  background: transparent;
  transition:
    background 180ms ease,
    transform 180ms ease;
}

.article-card > a:hover,
.article-card > a:focus-visible {
  background: rgba(237, 243, 241, 0.66);
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.article-card-number {
  color: var(--gold);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.article-card-category {
  padding: 3px 9px;
  border: 1px solid rgba(20, 112, 90, 0.19);
  border-radius: 999px;
  color: var(--green);
  background: rgba(20, 112, 90, 0.05);
  font-size: 0.7rem;
  font-weight: 800;
}

.article-card h3 {
  margin: 0;
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: clamp(1.15rem, 1.55vw, 1.42rem);
  font-weight: 700;
  line-height: 1.65;
}

.article-card p {
  margin: 16px 0 24px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.85;
}

.article-card-link {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 900;
}

.column-library {
  padding: clamp(76px, 9vw, 116px) 0 clamp(92px, 10vw, 140px);
  background: var(--column-mist);
}

.column-library-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.column-search {
  position: relative;
  width: min(100%, 360px);
}

.column-search svg {
  position: absolute;
  top: 50%;
  left: 16px;
  width: 19px;
  height: 19px;
  color: var(--green);
  transform: translateY(-50%);
  pointer-events: none;
}

.column-search input {
  width: 100%;
  min-height: 52px;
  border: 1px solid rgba(18, 46, 89, 0.19);
  border-radius: 3px;
  outline: none;
  padding: 12px 16px 12px 47px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.84);
}

.column-search input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(20, 112, 90, 0.11);
}

.column-category-nav {
  display: flex;
  overflow-x: auto;
  gap: 7px;
  margin-top: 38px;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.column-category-nav a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid rgba(18, 46, 89, 0.16);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.66);
  font-size: 0.78rem;
  font-weight: 800;
}

.column-category-nav a[aria-current="true"],
.column-category-nav a:hover,
.column-category-nav a:focus-visible {
  border-color: var(--green);
  color: var(--white);
  background: var(--green);
}

.column-result {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.article-category-section {
  scroll-margin-top: 100px;
  margin-top: 80px;
}

.article-category-section[hidden] {
  display: none;
}

.article-category-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 470px);
  gap: 44px;
  align-items: end;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--column-gold-line);
  padding-bottom: 20px;
}

.article-category-head h2 {
  margin-bottom: 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.article-category-head > p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
}

.article-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: rgba(18, 46, 89, 0.13);
}

.article-card-grid .article-card {
  background: var(--column-paper);
}

.article-card-grid .article-card[hidden] {
  display: none;
}

.article-card-grid .article-card > a {
  min-height: 300px;
  padding: 27px;
}

.column-empty {
  margin-top: 58px;
  padding: 50px 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.74);
}

.column-empty button {
  border: 0;
  border-bottom: 1px solid currentColor;
  padding: 5px 0;
  color: var(--green);
  background: transparent;
  font-weight: 800;
  cursor: pointer;
}

.column-contact-band {
  padding: clamp(72px, 9vw, 112px) 0;
  color: var(--white);
  background:
    radial-gradient(circle at 80% 10%, rgba(44, 129, 167, 0.24), transparent 25rem),
    var(--navy);
}

.column-contact-band-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: clamp(46px, 8vw, 110px);
  align-items: end;
}

.column-contact-band h2 {
  color: var(--white);
  font-size: clamp(2rem, 3.8vw, 3.35rem);
}

.column-contact-band-inner > div:last-child > p {
  margin: 0 0 24px;
  color: #d8e3eb;
}

.column-contact-band .button {
  min-width: 230px;
  background: #177a62;
}

.column-site-footer .footer-grid {
  grid-template-columns: 1.1fr 0.8fr 1fr;
}

.column-site-footer a:hover,
.column-site-footer a:focus-visible {
  color: var(--green);
}

/* Article detail */
.article-breadcrumb {
  display: flex;
  overflow: hidden;
  align-items: center;
  gap: 10px;
  padding-top: 24px;
  padding-bottom: 24px;
  color: var(--muted);
  font-size: 0.76rem;
  white-space: nowrap;
}

.article-breadcrumb a:hover,
.article-breadcrumb a:focus-visible {
  color: var(--green);
}

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

.article-hero {
  padding: clamp(50px, 7vw, 90px) 0 clamp(56px, 8vw, 94px);
  background:
    radial-gradient(circle at 85% 20%, rgba(44, 129, 167, 0.1), transparent 24rem),
    linear-gradient(135deg, #f8f5ef 0%, var(--column-paper) 58%, var(--column-mist) 100%);
}

.article-hero-inner {
  max-width: 920px;
}

.article-hero-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.article-hero-number {
  color: var(--gold);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.article-hero-meta a {
  padding: 4px 10px;
  border: 1px solid rgba(20, 112, 90, 0.18);
  border-radius: 999px;
  color: var(--green);
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.72rem;
  font-weight: 800;
}

.article-hero h1 {
  margin: 0;
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: clamp(2.05rem, 4.4vw, 4rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.34;
  text-wrap: pretty;
  word-break: auto-phrase;
}

.article-hero-inner > p {
  max-width: 800px;
  margin: 27px 0 0;
  color: var(--muted);
  font-size: clamp(0.96rem, 1.15vw, 1.05rem);
  line-height: 1.95;
}

.article-reading-guide {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 28px;
  border-top: 1px solid var(--column-gold-line);
  padding-top: 19px;
  color: var(--muted);
  font-size: 0.78rem;
}

.article-reading-guide strong {
  margin-right: 5px;
  color: var(--green);
  font-size: 0.92rem;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--column-reading)) minmax(240px, 290px);
  gap: clamp(50px, 7vw, 90px);
  justify-content: center;
  align-items: start;
  padding-top: clamp(62px, 8vw, 100px);
  padding-bottom: clamp(80px, 10vw, 130px);
}

.article-content {
  min-width: 0;
  color: #25364a;
  font-size: clamp(1rem, 1.08vw, 1.06rem);
  line-height: 2.05;
}

.article-audience-note {
  margin: 0 0 clamp(30px, 4vw, 44px);
  padding: clamp(18px, 3vw, 24px);
  border-left: 4px solid var(--green);
  background: var(--column-mist);
}

.article-audience-note p {
  margin: 0;
}

.article-audience-note p + p {
  margin-top: 8px;
}

.article-audience-label {
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.article-content > h2 {
  position: relative;
  scroll-margin-top: 104px;
  margin: 3.3em 0 1.3em;
  border-top: 1px solid var(--column-gold-line);
  padding: 1.1em 0 0;
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: clamp(1.62rem, 2.7vw, 2.2rem);
  font-weight: 700;
  line-height: 1.5;
}

.article-content > h2::before {
  position: absolute;
  top: -2px;
  left: 0;
  width: 74px;
  height: 3px;
  content: "";
  background: var(--green);
}

.article-content > h3 {
  scroll-margin-top: 104px;
  margin: 2.4em 0 0.85em;
  padding-left: 17px;
  border-left: 3px solid var(--green);
  color: #173e60;
  font-size: clamp(1.18rem, 1.7vw, 1.42rem);
  line-height: 1.65;
}

.article-content > h4 {
  margin: 2em 0 0.7em;
  color: var(--green);
  font-size: 1.08rem;
}

.article-content p {
  margin: 0 0 1.45em;
}

.article-content strong {
  color: #123f35;
}

.article-content a {
  color: #16698f;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.article-content a:hover,
.article-content a:focus-visible {
  color: var(--green);
}

.article-content ul,
.article-content ol {
  margin: 1.3em 0 1.8em;
  padding: 20px 25px 20px 48px;
  background: var(--column-mist);
}

.article-content li {
  margin: 0.48em 0;
  padding-left: 0.2em;
}

.article-content code {
  border-radius: 3px;
  padding: 0.12em 0.35em;
  color: #8a4035;
  background: #f6ebe8;
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 0.9em;
}

.article-content blockquote {
  margin: 1.8em 0;
  border-left: 3px solid var(--gold);
  padding: 16px 22px;
  color: var(--muted);
  background: #fbf6ea;
}

.article-content .table-scroll {
  overflow-x: auto;
  margin: 1.7em 0 2.1em;
  border: 1px solid var(--line);
}

.article-content table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 0.88rem;
  line-height: 1.75;
}

.article-content th,
.article-content td {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
}

.article-content tr:last-child td {
  border-bottom: 0;
}

.article-content th:last-child,
.article-content td:last-child {
  border-right: 0;
}

.article-content th {
  color: var(--navy);
  background: var(--column-mist);
}

.article-summary {
  position: relative;
  margin-bottom: 54px;
  border-top: 4px solid var(--gold);
  padding: clamp(27px, 4vw, 42px);
  background: #fbf6e9;
}

.article-summary h2 {
  margin: 0 0 20px;
  color: #765817;
  font-family: var(--column-serif);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  line-height: 1.4;
}

.article-summary > p:last-child {
  margin-bottom: 0;
}

.article-summary > p:first-of-type {
  color: var(--navy);
  font-size: clamp(1.04rem, 1.4vw, 1.14rem);
  line-height: 1.95;
}

.article-points {
  margin: 0 0 64px;
  border: 1px solid rgba(18, 46, 89, 0.13);
  padding: 25px 30px 28px;
}

.article-points h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: 1rem;
  font-weight: 900;
}

.article-points ul {
  margin: 0;
  padding: 0;
  background: transparent;
  list-style: none;
}

.article-points li {
  position: relative;
  margin: 0.4em 0;
  padding-left: 1.3em;
}

.article-points li::before {
  position: absolute;
  top: 0.7em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  content: "";
  background: var(--green);
}

.article-reference-heading {
  color: var(--muted) !important;
  font-size: 1.35rem !important;
}

.article-disclaimer {
  margin-top: 55px;
  border: 1px solid var(--line);
  padding: 22px 24px;
  color: var(--muted);
  background: #fafbfa;
  font-size: 0.8rem;
  line-height: 1.8;
}

.article-disclaimer p {
  margin: 0;
}

.article-disclaimer p + p {
  margin-top: 7px;
}

.article-side {
  position: sticky;
  top: 98px;
  display: grid;
  gap: 24px;
}

.article-toc {
  border-top: 3px solid var(--green);
  padding: 20px 0 0;
}

.article-toc > p {
  margin: 0 0 13px;
  color: var(--navy);
  font-size: 0.82rem;
  font-weight: 900;
}

.article-toc ol {
  max-height: 48vh;
  overflow-y: auto;
  margin: 0;
  padding: 0 8px 0 1.4em;
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.65;
  scrollbar-width: thin;
}

.article-toc li {
  margin: 0.65em 0;
  padding-left: 0.25em;
}

.article-toc a:hover,
.article-toc a:focus-visible {
  color: var(--green);
}

.article-side-consult {
  padding: 25px;
  color: var(--white);
  background: var(--navy);
}

.article-side-consult .section-kicker {
  margin: 0;
  font-size: 0.62rem;
}

.article-side-consult h2 {
  margin: 10px 0 13px;
  color: var(--white);
  font-size: 1.35rem;
  line-height: 1.45;
}

.article-side-consult > p:not(.section-kicker) {
  margin: 0 0 18px;
  color: #d5e0e8;
  font-size: 0.78rem;
  line-height: 1.75;
}

.article-side-consult a {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  padding-top: 13px;
  color: #f0c971;
  font-size: 0.82rem;
  font-weight: 900;
}

.article-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--column-gold-line);
  border-bottom: 1px solid var(--column-gold-line);
}

.article-pager a {
  display: grid;
  gap: 8px;
  min-height: 132px;
  align-content: center;
  padding: 25px 30px;
  transition: background 180ms ease;
}

.article-pager a:hover,
.article-pager a:focus-visible {
  background: var(--column-mist);
}

.article-pager a + a {
  border-left: 1px solid rgba(18, 46, 89, 0.14);
}

.article-pager span {
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 900;
}

.article-pager strong {
  color: var(--navy);
  font-family: var(--column-serif);
  font-size: 1rem;
  line-height: 1.6;
}

.article-pager-next {
  text-align: right;
}

.related-articles {
  padding: clamp(80px, 10vw, 128px) 0;
  background: var(--column-mist);
}

.related-articles .article-card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.related-all-link {
  margin: 30px 0 0;
  text-align: right;
}

.related-all-link a {
  border-bottom: 1px solid currentColor;
  padding-bottom: 4px;
  color: var(--green);
  font-weight: 900;
}

@media (max-width: 980px) {
  .article-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-layout {
    grid-template-columns: minmax(0, var(--column-reading));
  }

  .article-side {
    position: static;
    grid-row: 1;
  }

  .article-side-consult {
    display: none;
  }

  .article-toc {
    border: 1px solid var(--line);
    padding: 22px 25px;
    background: #fafbf9;
  }

  .article-toc ol {
    max-height: none;
    columns: 2;
    column-gap: 38px;
  }
}

@media (max-width: 760px) {
  .column-page .desktop-nav {
    display: none;
  }

  .column-page .menu-button {
    display: grid;
    grid-column: 3;
  }

  .column-page .mobile-nav.is-open {
    display: grid;
  }

  .column-hero-grid,
  .column-contact-band-inner {
    grid-template-columns: 1fr;
  }

  .column-hero {
    padding-top: 64px;
  }

  .column-hero h1 {
    font-size: clamp(2rem, 9vw, 2.6rem);
  }

  .column-hero-note {
    max-width: 330px;
  }

  .featured-article-grid {
    grid-template-columns: 1fr;
  }

  .featured-article-grid .article-card,
  .featured-article-grid .article-card:first-child {
    border-top: 1px solid rgba(18, 46, 89, 0.14);
    border-left: 0;
  }

  .featured-article-grid .article-card:first-child {
    border-top: 0;
  }

  .article-card > a,
  .article-card-grid .article-card > a {
    min-height: 0;
  }

  .column-library-head {
    align-items: stretch;
    flex-direction: column;
  }

  .column-library-head,
  .article-category-head {
    display: flex;
    gap: 22px;
    flex-direction: column;
    align-items: stretch;
  }

  .column-search {
    width: 100%;
  }

  .article-card-grid,
  .related-articles .article-card-grid {
    grid-template-columns: 1fr;
  }

  .article-category-section {
    margin-top: 62px;
  }

  .column-contact-band h2 br {
    display: none;
  }

  .column-site-footer .footer-grid {
    grid-template-columns: 1fr;
  }

  .article-hero {
    padding-top: 45px;
  }

  .article-hero h1 {
    font-size: clamp(1.75rem, 7.8vw, 2.8rem);
  }

  .article-layout {
    gap: 42px;
    width: min(100% - 32px, var(--column-reading));
  }

  .article-toc ol {
    columns: 1;
  }

  .article-summary {
    margin-right: -4px;
    margin-left: -4px;
    padding: 24px 21px;
  }

  .article-points {
    padding: 22px 20px;
  }

  .article-content ul,
  .article-content ol {
    padding: 17px 18px 17px 39px;
  }

  .article-pager {
    grid-template-columns: 1fr;
    width: min(100% - 32px, var(--container));
  }

  .article-pager a + a {
    border-top: 1px solid rgba(18, 46, 89, 0.14);
    border-left: 0;
  }

  .article-pager-next {
    text-align: left;
  }
}

@media (max-width: 440px) {
  .column-page .header-inner {
    width: min(100% - 24px, 1200px);
  }

  .column-page .brand img {
    width: 165px;
  }

  .column-page .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .column-hero-copy > p:last-child {
    font-size: 0.95rem;
  }

  .article-card > a,
  .article-card-grid .article-card > a {
    padding: 24px 21px;
  }

  .article-card h3 {
    font-size: 1.18rem;
  }

  .article-reading-guide {
    display: grid;
    gap: 6px;
  }

  .article-layout {
    width: min(100% - 28px, var(--column-reading));
  }

  .article-content {
    font-size: 0.98rem;
    line-height: 2;
  }

  .article-content > h2 {
    font-size: 1.55rem;
  }

  .article-toc {
    padding: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-card > a {
    transition: none;
  }
}