:root {
  --ink: #101923;
  --ink-soft: #263443;
  --muted: #647180;
  --line: #dce1e6;
  --line-dark: #b8c1ca;
  --paper: #f4f5f2;
  --surface: #eef2f5;
  --white: #fff;
  --blue: #0f4d91;
  --blue-deep: #102f5e;
  --yellow: #f2d849;
  --green: #16834b;
  --font-sans: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

img {
  max-width: 100%;
}

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

button,
input,
textarea,
select {
  font: inherit;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.site-container,
.column-container,
.article-header-inner,
.article-shell,
.article-cta-inner,
.related-articles-inner,
.article-bottom-back {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 8px 12px;
  transform: translateY(-150%);
  color: var(--white);
  background: var(--ink);
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(16, 25, 35, 0.12);
  background: rgba(255, 255, 255, 0.98);
}

.header-inner {
  display: grid;
  width: min(1380px, calc(100% - 32px));
  min-height: 76px;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  margin-inline: auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: block;
  width: 40px;
  height: 40px;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand-name {
  color: var(--blue-deep);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 20px;
  font-weight: 800;
}

.brand-meta {
  color: var(--muted);
  font-size: 8px;
  font-weight: 700;
}

.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
}

.desktop-nav a {
  padding-block: 25px;
  border-bottom: 2px solid transparent;
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  border-bottom-color: var(--blue);
}

.header-cta,
.mobile-nav-cta {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 10px 15px;
  gap: 8px;
  color: var(--white);
  background: var(--green);
  font-size: 11px;
  font-weight: 800;
}

.mobile-menu-button,
.mobile-nav,
.mobile-line-dock {
  display: none;
}

.column-hero {
  padding-block: 82px 76px;
  border-bottom: 6px solid var(--yellow);
  color: var(--white);
  background: var(--blue-deep);
}

.column-hero-grid {
  display: grid;
  grid-template-columns: 0.35fr 1.65fr;
  gap: 70px;
}

.column-hero-label {
  margin-top: 8px;
  color: var(--yellow);
  font-size: 11px;
  font-weight: 800;
}

.column-hero h1 {
  margin-bottom: 22px;
  color: var(--white);
  font-size: 46px;
  font-weight: 900;
  line-height: 1.4;
}

.column-hero-copy {
  display: block;
  max-width: 700px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.post-index {
  padding-block: 72px 96px;
  background: var(--white);
}

.post-list {
  border-top: 1px solid var(--ink);
}

.post-item {
  display: grid;
  grid-template-columns: 70px 1fr 100px 32px;
  align-items: center;
  padding-block: 31px;
  border-bottom: 1px solid var(--line-dark);
  gap: 30px;
}

.post-number {
  align-self: start;
  color: var(--blue);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 22px;
  font-weight: 700;
}

.post-meta {
  display: flex;
  margin-bottom: 8px;
  gap: 8px;
}

.post-meta span {
  color: var(--blue);
  font-size: 10px;
  font-weight: 800;
}

.post-copy h2 {
  margin-bottom: 8px;
  font-size: 22px;
  line-height: 1.55;
}

.post-copy h2 a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.post-copy > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

.post-item time {
  color: var(--muted);
  font-size: 10px;
}

.post-arrow {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 20px;
}

.column-empty-state {
  display: flex;
  min-height: 110px;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line-dark);
  gap: 30px;
}

.column-empty-state h2 {
  margin-bottom: 4px;
  font-size: 20px;
}

.column-empty-state p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 13px;
}

.article-header {
  padding-block: 46px 72px;
  border-bottom: 6px solid var(--yellow);
  color: var(--white);
  background: var(--blue-deep);
}

.article-top-back,
.article-bottom-back a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  font-weight: 800;
}

.article-top-back {
  margin-bottom: 50px;
  color: rgba(255, 255, 255, 0.72);
}

.preview-banner {
  width: max-content;
  margin-bottom: 18px;
  padding: 4px 8px;
  color: var(--ink);
  background: var(--yellow);
  font-size: 10px;
  font-weight: 800;
}

.article-heading {
  display: grid;
  grid-template-columns: 0.28fr 1.72fr;
  gap: 50px;
}

.article-heading .category {
  margin: 5px 0 0;
  color: var(--yellow);
  font-size: 11px;
  font-weight: 800;
}

.article-heading h1 {
  margin-bottom: 22px;
  color: var(--white);
  font-size: 42px;
  font-weight: 900;
  line-height: 1.5;
}

.article-heading .description {
  max-width: 720px;
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 10px;
}

.article-shell {
  display: grid;
  grid-template-columns: 170px minmax(0, 760px);
  justify-content: center;
  padding-block: 80px 96px;
  gap: 70px;
}

.article-rail {
  align-self: start;
  padding-top: 8px;
  border-top: 1px solid var(--ink);
}

.article-rail span {
  display: block;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: 800;
}

.article-rail p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 10px;
}

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

.article-cover {
  margin: 0 0 44px;
}

.article-cover img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.article-body {
  color: var(--ink-soft);
}

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

.article-body h2 {
  margin: 58px 0 20px;
  padding-top: 16px;
  border-top: 1px solid var(--ink);
  color: var(--ink);
  font-size: 27px;
  line-height: 1.55;
}

.article-body p,
.article-body li {
  line-height: 2.05;
}

.article-body ul {
  margin-block: 24px 34px;
  padding-left: 1.5em;
}

.article-note {
  margin-block: 32px;
  padding: 22px 24px;
  border-left: 4px solid var(--yellow);
  background: var(--surface);
}

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

.article-internal-link {
  display: grid;
  margin-block: 36px;
  padding: 24px;
  border: 1px solid #c7d6e5;
  border-left: 5px solid var(--blue);
  background: #f3f7fb;
  gap: 14px;
}

.article-internal-link p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.article-internal-link a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--blue-deep);
  gap: 18px;
}

.article-internal-link a:hover strong,
.article-internal-link a:focus-visible strong {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.related-articles {
  padding-block: 68px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.related-articles-head {
  display: grid;
  grid-template-columns: 0.35fr 1.65fr;
  align-items: end;
  margin-bottom: 34px;
  gap: 40px;
}

.related-articles-head p {
  margin: 0;
  color: var(--blue);
  font-size: 10px;
  font-weight: 800;
}

.related-articles-head h2 {
  margin: 0;
  font-size: 27px;
}

.related-article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.related-article-grid.related-count-1 {
  grid-template-columns: minmax(0, 1fr);
}

.related-article-grid.related-count-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.related-article-grid > a {
  position: relative;
  display: grid;
  min-height: 245px;
  padding: 24px 42px 24px 20px;
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  gap: 11px;
  background: var(--white);
}

.related-article-grid > a:first-child {
  border-left: 1px solid var(--line-dark);
}

.related-article-grid span {
  color: var(--blue);
  font-size: 9px;
  font-weight: 800;
}

.related-article-grid strong {
  align-self: start;
  font-size: 16px;
  line-height: 1.65;
}

.related-article-grid small {
  align-self: end;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}

.related-article-grid b {
  position: absolute;
  top: 20px;
  right: 18px;
  color: var(--blue);
}

.related-article-grid > a:hover strong,
.related-article-grid > a:focus-visible strong {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-cta {
  padding-block: 68px;
  background: var(--blue);
}

.article-cta-inner {
  display: grid;
  grid-template-columns: 1fr 290px;
  align-items: center;
  gap: 64px;
}

.article-cta-inner > div > p {
  margin-bottom: 10px;
  color: var(--yellow);
  font-size: 10px;
  font-weight: 800;
}

.article-cta h2 {
  margin-bottom: 12px;
  color: var(--white);
  font-size: 26px;
  line-height: 1.55;
}

.article-cta-inner > div > span {
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
}

.article-service-link {
  display: block;
  width: max-content;
  max-width: 100%;
  margin-top: 17px;
  color: var(--white);
  font-size: 11px;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-cta-inner > a {
  display: grid;
  min-height: 90px;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 20px;
  gap: 12px;
  color: var(--white);
  background: var(--green);
  font-size: 13px;
}

.article-bottom-back {
  padding-block: 34px 72px;
}

.site-footer {
  padding-block: 72px 24px;
  color: rgba(255, 255, 255, 0.72);
  background: var(--ink);
}

.footer-lead {
  display: grid;
  grid-template-columns: 0.5fr 1.5fr;
  padding-bottom: 42px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  gap: 50px;
}

.footer-wordmark {
  margin: 0;
  color: var(--white);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 30px;
  font-weight: 800;
}

.footer-lead > p:last-child {
  max-width: 620px;
  margin: 0;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  padding-block: 38px;
  gap: 54px;
}

.footer-grid h2 {
  margin-bottom: 13px;
  color: var(--yellow);
  font-size: 10px;
  text-transform: uppercase;
}

.footer-grid p,
.footer-grid a {
  display: block;
  margin: 7px 0;
  font-size: 11px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.42);
  font-size: 9px;
}

@media (max-width: 1100px) {
  .desktop-nav {
    gap: 14px;
  }

  .desktop-nav a {
    font-size: 10px;
  }

  .header-cta {
    max-width: 180px;
  }
}

@media (max-width: 900px) {
  .header-inner {
    min-height: 68px;
    grid-template-columns: 1fr auto;
  }

  .desktop-nav,
  .header-cta {
    display: none;
  }

  .mobile-menu-button {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border: 0;
    color: var(--blue-deep);
    background: transparent;
    cursor: pointer;
    font-size: 25px;
  }

  .mobile-nav {
    position: fixed;
    z-index: 45;
    inset: 68px 0 auto;
    max-height: calc(100svh - 68px);
    overflow-y: auto;
    padding: 20px 16px 26px;
    border-top: 1px solid var(--line);
    background: var(--white);
  }

  .mobile-nav:not([hidden]) {
    display: grid;
  }

  .mobile-nav > a:not(.mobile-nav-cta) {
    padding: 15px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 13px;
    font-weight: 800;
  }

  .mobile-nav-cta {
    margin-top: 18px;
  }

  .mobile-line-dock {
    position: fixed;
    z-index: 40;
    right: 12px;
    bottom: 12px;
    left: 12px;
    display: flex;
    min-height: 52px;
    align-items: center;
    justify-content: center;
    color: var(--white);
    background: var(--green);
    box-shadow: 0 8px 28px rgba(16, 25, 35, 0.24);
    font-size: 13px;
    font-weight: 800;
  }
}

@media (max-width: 760px) {
  .site-container,
  .column-container,
  .article-header-inner,
  .article-shell,
  .article-cta-inner,
  .related-articles-inner,
  .article-bottom-back {
    width: calc(100% - 32px);
  }

  .column-hero {
    padding-block: 54px 48px;
  }

  .column-hero-grid,
  .article-heading,
  .article-shell,
  .article-cta-inner,
  .related-articles-head,
  .footer-lead,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .column-hero-grid {
    gap: 25px;
  }

  .column-hero h1 {
    font-size: 34px;
  }

  .post-index {
    padding-block: 54px 80px;
  }

  .post-item {
    grid-template-columns: 36px 1fr 24px;
    padding-block: 25px;
    gap: 14px;
  }

  .post-number {
    font-size: 16px;
  }

  .post-copy h2 {
    font-size: 17px;
  }

  .post-copy > p:last-child {
    display: none;
  }

  .post-item time {
    grid-column: 2;
    grid-row: 2;
  }

  .post-arrow {
    grid-column: 3;
    grid-row: 1 / 3;
  }

  .article-header {
    padding-block: 34px 56px;
  }

  .article-top-back {
    margin-bottom: 38px;
  }

  .article-heading,
  .article-shell,
  .article-cta-inner {
    gap: 26px;
  }

  .article-heading h1 {
    font-size: 33px;
  }

  .article-shell {
    padding-block: 56px 70px;
  }

  .article-rail {
    display: none;
  }

  .article-body h2 {
    font-size: 24px;
  }

  .article-cta {
    padding-block: 54px;
  }

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

  .related-article-grid > a {
    min-height: 0;
    border-left: 1px solid var(--line-dark);
  }

  .article-cta h2 {
    font-size: 22px;
  }

  .footer-lead,
  .footer-grid {
    gap: 28px;
  }

  .footer-bottom {
    padding-bottom: 68px;
  }
}