/* ============================================================
   Base
   ============================================================ */

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--color-ink);
  background-color: var(--color-bg);
  background-image: url("/assets/img/brand/grain.svg");
  background-attachment: fixed;
  background-repeat: repeat;
  letter-spacing: var(--tracking-body);
}

h1,
h2,
h3,
h4 {
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
}

a {
  color: var(--color-accent);
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent-hover);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================================
   Utilities
   ============================================================ */

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-ink-60);
  margin-bottom: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
}

.eyebrow::after {
  content: "";
  display: inline-block;
  width: 32px;
  height: 1px;
  background: var(--color-ink-40);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--fs-small);
}

.link-arrow::after {
  content: "→";
  transition: transform var(--transition-base);
}

.link-arrow:hover {
  color: var(--color-accent-hover);
}

.link-arrow:hover::after {
  transform: translateX(3px);
}

/* ============================================================
   Header
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding-block: 0.75rem;
}

.site-header__brand {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: var(--tracking-brand);
}

.site-header__brand:hover {
  color: var(--color-ink);
}

/* Nav */

.site-nav__list {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.site-nav__list a {
  color: var(--color-ink);
  font-size: var(--fs-small);
  font-weight: 500;
}

.site-nav__list a:hover {
  color: var(--color-accent);
}

.site-nav__toggle {
  display: none;
}

@media (max-width: 640px) {
  .site-nav__toggle {
    display: block;
    width: 40px;
    height: 40px;
    position: relative;
  }

  .site-nav__list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
  }

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

  .site-nav__list li {
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav__list li:last-child {
    border-bottom: 0;
  }

  .site-nav__list a {
    display: block;
    padding: 1rem 1.25rem;
  }

  .hamburger,
  .hamburger::before,
  .hamburger::after {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-ink);
    position: absolute;
    left: 9px;
    transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base);
  }

  .hamburger {
    top: 19px;
  }

  .hamburger::before,
  .hamburger::after {
    content: "";
    left: 0;
  }

  .hamburger::before {
    top: -6px;
  }

  .hamburger::after {
    top: 6px;
  }

  .site-nav__toggle[aria-expanded="true"] .hamburger {
    background: transparent;
  }

  .site-nav__toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
  }

  .site-nav__toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
  }
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding-block: clamp(4rem, 12vw, 9rem);
}

.hero__headline {
  font-family: var(--font-sans);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: var(--tracking-display);
  max-width: 18ch;
  margin-bottom: 1.75rem;
  animation: fadeUp 600ms var(--ease-refined) both;
}

.hero__lead {
  font-size: var(--fs-lead);
  color: var(--color-ink-60);
  max-width: 42ch;
  line-height: var(--lh-relaxed);
  margin-bottom: 2.5rem;
  animation: fadeUp 600ms var(--ease-refined) 150ms both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  animation: fadeUp 600ms var(--ease-refined) 300ms both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__headline,
  .hero__lead,
  .hero__actions {
    animation: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   Section
   ============================================================ */

.page-hero {
  padding-block: clamp(3.5rem, 9vw, 6rem);
}

.page-hero__title {
  font-family: var(--font-serif);
  font-size: var(--fs-hero);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: var(--tracking-display);
  margin-bottom: 1.25rem;
}

.page-hero__lead {
  font-size: var(--fs-lead);
  color: var(--color-ink-60);
  max-width: 42ch;
  line-height: var(--lh-relaxed);
}

@media (min-width: 640px) {
  .page-hero__lead {
    max-width: none;
  }
}

.page-hero__meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.75rem;
}

.page-hero__category {
  font-size: var(--fs-small);
  color: var(--color-ink-60);
  margin: 0;
}

.badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg);
  color: var(--color-ink-60);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section__text {
  font-size: var(--fs-body);
  color: var(--color-ink);
  line-height: var(--lh-normal);
  max-width: 64ch;
  margin-top: 1.5rem;
}

@media (min-width: 640px) {
  .section__text {
    max-width: none;
  }
}

.section {
  padding-block: clamp(4rem, 10vw, 7.5rem);
  border-top: 1px solid var(--color-border);
}

.section__title {
  font-family: var(--font-serif);
  font-size: var(--fs-h1);
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: var(--tracking-display);
}

.section__lead {
  font-size: var(--fs-lead);
  color: var(--color-ink-60);
  max-width: 56ch;
  line-height: var(--lh-relaxed);
  margin-bottom: 2.5rem;
}

.section__lead + .section__lead {
  margin-top: -1rem;
}

.section__links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 2rem;
}

@media (min-width: 640px) {
  .hero__headline,
  .hero__lead,
  .section__lead {
    max-width: none;
  }
}

/* ============================================================
   Button
   ============================================================ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: var(--fs-small);
  font-weight: 500;
  transition: background var(--transition-base), color var(--transition-base),
    border-color var(--transition-base);
  white-space: nowrap;
}

.button--primary {
  background: var(--color-accent);
  color: var(--color-surface);
}

.button--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-surface);
}

.button--secondary {
  background: var(--color-surface);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.button--secondary:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

/* ============================================================
   Product grid / card
   ============================================================ */

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 720px) {
  .product-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }
}

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

@media (min-width: 720px) {
  .product-card {
    padding: 2.5rem;
  }

  .product-grid > .product-card:only-child {
    display: grid;
    grid-template-columns: minmax(200px, 1fr) minmax(0, 2fr);
    gap: 1rem 3.5rem;
    align-items: start;
    padding: 3rem;
  }

  .product-grid > .product-card:only-child .product-card__badge {
    grid-column: 1;
    grid-row: 1;
  }

  .product-grid > .product-card:only-child .product-card__title {
    grid-column: 1;
    grid-row: 2;
  }

  .product-grid > .product-card:only-child .product-card__category {
    grid-column: 1;
    grid-row: 3;
  }

  .product-grid > .product-card:only-child .product-card__description {
    grid-column: 2;
    grid-row: 1 / span 3;
    margin-top: 0;
  }

  .product-grid > .product-card:only-child > .link-arrow {
    grid-column: 2;
    grid-row: 4;
    padding-top: 0.5rem;
  }
}

.product-card__badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--fs-caption);
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg);
  color: var(--color-ink-60);
  border-radius: 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.product-card__title {
  font-family: var(--font-serif);
  font-size: 1.625rem;
  font-weight: 600;
  letter-spacing: var(--tracking-display);
  margin-top: 0.25rem;
}

.product-card__category {
  font-size: var(--fs-small);
  color: var(--color-ink-60);
}

.product-card__description {
  color: var(--color-ink);
  line-height: var(--lh-normal);
  margin-top: 0.25rem;
  max-width: 64ch;
}

.product-card .link-arrow {
  margin-top: auto;
  padding-top: 0.5rem;
}

/* ============================================================
   Info table (事業者情報)
   ============================================================ */

.info-table {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-border);
}

.info-table__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.375rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.info-table--spaced {
  margin-top: 2rem;
}

.info-table--preserve-case dt {
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--color-ink);
}

@media (min-width: 640px) {
  .info-table--preserve-case dt {
    padding-top: 0;
  }
  .info-table--preserve-case .info-table__row {
    grid-template-columns: 14rem 1fr;
  }
}

.info-table dt {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--color-ink-40);
}

.info-table dd {
  color: var(--color-ink);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
}

.info-table dd a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1px;
}

.info-table dd a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

@media (min-width: 640px) {
  .info-table__row {
    grid-template-columns: 10rem 1fr;
    gap: 2.5rem;
    padding-block: 1.25rem;
    align-items: baseline;
  }

  .info-table dt {
    padding-top: 0.25rem;
  }
}

/* ============================================================
   Active nav state
   ============================================================ */

.site-nav__list a[aria-current="page"] {
  color: var(--color-accent);
}

/* ============================================================
   Feature grid / card
   ============================================================ */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2.5rem;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (min-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

@media (min-width: 960px) {
  .feature-card {
    padding: 2rem;
  }
}

.feature-card__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--tracking-display);
}

.feature-card__description {
  color: var(--color-ink-60);
  line-height: var(--lh-normal);
  font-size: var(--fs-small);
}

/* ============================================================
   Contact CTA
   ============================================================ */

.contact-cta__email {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-bottom: 1rem;
}

.contact-cta__email a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  transition: color var(--transition-base), border-color var(--transition-base);
}

.contact-cta__email a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 3rem 2rem;
  margin-top: 4rem;
}

.site-footer__inner {
  display: grid;
  gap: 2rem;
}

@media (min-width: 640px) {
  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: 3rem;
  }
}

.site-footer__wordmark {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
  letter-spacing: var(--tracking-brand);
}

.site-footer__address {
  font-size: var(--fs-small);
  color: var(--color-ink-60);
  margin-bottom: 0.25rem;
  line-height: 1.6;
}

.site-footer__email a {
  color: var(--color-ink-60);
  font-size: var(--fs-small);
}

.site-footer__email a:hover {
  color: var(--color-accent);
}

.site-footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer__nav a {
  color: var(--color-ink-60);
  font-size: var(--fs-small);
}

.site-footer__nav a:hover {
  color: var(--color-ink);
}

.site-footer__copy {
  grid-column: 1 / -1;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  font-size: var(--fs-caption);
  color: var(--color-ink-40);
  font-family: var(--font-serif);
  letter-spacing: 0.02em;
}