/* ---------- Grid ---------- */
.wrap {
  width: 100%;
  max-width: 92rem;
  margin-inline: auto;
  padding-inline: var(--margin);
}

.cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: var(--gap);
}

@media (min-width: 48rem) {
  .cols {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .cols {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
}

.span-all {
  grid-column: 1 / -1;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--gap);
  min-height: var(--header-h);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  font-variation-settings: 'wdth' 70;
  letter-spacing: -0.01em;
  text-decoration: none;
  line-height: 1;
}

.site-header__tagline {
  display: none;
  font-family: var(--font-display);
  font-size: var(--fs-meta);
  font-weight: 500;
  font-variation-settings: 'wdth' 90;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.menu-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0;
  border: 0;
  background: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.menu-toggle__icon {
  position: relative;
  width: 1.375rem;
  height: 0.625rem;
  border-block: 2px solid currentColor;
  transition: transform var(--dur-fast) var(--ease-out);
}

.menu-toggle[aria-expanded='true'] .menu-toggle__icon {
  border-bottom-color: transparent;
  transform: translateY(0.25rem);
}

.site-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  display: none;
  flex-direction: column;
  gap: var(--space-m);
  padding: var(--space-m) var(--margin) var(--space-l);
  background: var(--paper);
  overflow-y: auto;
}

.site-nav.is-open {
  display: flex;
}

.site-nav__list {
  display: grid;
  border-top: 1px solid var(--ink);
}

.site-nav__list a,
.site-nav__search {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.875rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 8vw, 2.5rem);
  font-weight: 700;
  font-variation-settings: 'wdth' 80;
  line-height: 1.05;
  text-decoration: none;
}

.site-nav__list a span {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--graphite);
}

.site-nav__search {
  justify-content: flex-start;
  font-size: 1.25rem;
  border: 0;
}

.site-nav a[aria-current='page'] {
  color: var(--signal);
}

@media (min-width: 64rem) {
  .site-header__tagline {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .site-nav,
  .site-nav.is-open {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
    margin-left: auto;
    padding: 0;
    background: none;
    overflow: visible;
  }

  .site-nav__list {
    display: flex;
    gap: 1.25rem;
    border: 0;
  }

  .site-nav__list a,
  .site-nav__search {
    padding: 0.375rem 0;
    border: 0;
    font-size: var(--fs-small);
    font-weight: 600;
    font-variation-settings: 'wdth' 92;
    letter-spacing: 0.02em;
    background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size var(--dur-fast) var(--ease-out);
  }

  .site-nav__list a:hover,
  .site-nav__search:hover,
  .site-nav a[aria-current='page'] {
    background-size: 100% 1px;
  }

  .site-nav__list a span {
    display: none;
  }

  .site-nav__search span {
    font-size: var(--fs-small);
  }
}

/* ---------- Page header (shared by index pages) ---------- */
.page-head {
  padding-block: var(--space-l) var(--space-m);
  border-bottom: 1px solid var(--ink);
}

.page-head__row {
  display: grid;
  gap: var(--space-s);
  align-items: end;
}

.page-head__title {
  font-size: var(--fs-display);
  font-weight: 800;
  font-variation-settings: 'wdth' 72;
  letter-spacing: -0.025em;
  line-height: 0.92;
}

.page-head__title span[lang='ja'] {
  display: block;
  margin-top: 0.75rem;
  font-family: var(--font-body);
  font-size: var(--fs-h3);
  font-weight: 500;
  letter-spacing: 0;
}

.page-head__lead {
  max-width: 34em;
  color: var(--graphite);
  line-height: 1.75;
  text-wrap: pretty;
}

@media (min-width: 64rem) {
  .page-head__row {
    grid-template-columns: 7fr 5fr;
    gap: var(--gap);
  }
}

.section {
  padding-block: var(--space-l);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap);
  padding-bottom: var(--space-s);
  margin-bottom: var(--space-m);
  border-bottom: 1px solid var(--ink);
}

.section-head h2 {
  font-size: var(--fs-h2);
  font-variation-settings: 'wdth' 80;
}

.section-head a {
  font-size: var(--fs-small);
  font-weight: 500;
  white-space: nowrap;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-xl);
  background: var(--ink);
  color: var(--paper);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-m);
  padding-block: var(--space-l);
}

.site-footer__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 12vw, 9rem);
  font-variation-settings: 'wdth' 62;
  line-height: 0.85;
  letter-spacing: -0.02em;
}

.site-footer__cols {
  display: grid;
  gap: var(--space-m);
  align-content: end;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
}

.site-footer__links a {
  text-decoration: none;
}

.site-footer__links a:hover {
  text-decoration: underline;
}

.site-footer__note,
.site-footer__env {
  max-width: 36em;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: color-mix(in srgb, var(--paper) 74%, var(--ink));
}

.site-footer :focus-visible {
  outline-color: var(--paper);
}

@media (min-width: 64rem) {
  .site-footer__inner {
    grid-template-columns: 7fr 5fr;
  }
}