* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  background: #f3e6d8; /* warm paper */
  color: #18120e;      /* near-black */
  line-height: 1.6;
}

html[data-lang="en"] [data-lang="ja"] {
  display: none;
}
html[data-lang="ja"] [data-lang="en"] {
  display: none;
}

a {
  color: #8b1b1b; /* deep red accent */
  text-decoration: none;
}
a:hover,
a:focus {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid rgba(0,0,0,0.12);
  background: rgba(243,230,216,0.96);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid #8b1b1b;
  color: #8b1b1b;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}
.brand-text {
  display: flex;
  flex-direction: column;
}
.brand-name {
  font-size: 0.95rem;
  letter-spacing: 0.03em;
}
.brand-tagline {
  font-size: 0.72rem;
  opacity: 0.7;
}

.main-nav {
  margin-left: auto;
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
}
.nav-link {
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
}
.nav-link:hover,
.nav-link:focus {
  border-color: rgba(0,0,0,0.4);
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1rem;
}
.lang-btn {
  border: none;
  background: none;
  padding: 0.15rem 0.4rem;
  font-size: 0.8rem;
  color: #32251c;
  cursor: pointer;
}
.lang-btn.is-active {
  border-bottom: 1px solid #8b1b1b;
  color: #8b1b1b;
}
.lang-btn:focus-visible {
  outline: 2px solid #8b1b1b;
  outline-offset: 2px;
}
.lang-sep {
  font-size: 0.75rem;
  opacity: 0.6;
}

.hero {
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 2.75rem;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.1fr);
  gap: 3rem;
}
.hero-copy h1 {
  font-size: clamp(1.8rem, 2.5vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 0.75rem;
}
.hero-lead {
  margin: 0 0 0.75rem;
  font-size: 0.98rem;
}
.hero-meta {
  margin: 0.25rem 0 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-panel {
  background: #171921; /* dark secondary panel */
  color: #f7f2ea;
  padding: 1.75rem 1.5rem;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(0,0,0,0.28);
}
.hero-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.82rem;
}
.field-label {
  opacity: 0.85;
}
.field-input {
  padding: 0.55rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.25);
  background: rgba(2,4,11,0.4);
  color: #f7f2ea;
  font-size: 0.85rem;
}
.field-input::placeholder {
  color: rgba(247,242,234,0.45);
}
.field-input:focus-visible {
  outline: 2px solid #e45a5a;
  outline-offset: 1px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 0.75rem;
}

.btn-primary {
  margin-top: 0.25rem;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1px solid #e45a5a;
  background: #e45a5a;
  color: #fff8ef;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: #c54040;
  border-color: #c54040;
}

.btn-outline {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid #8b1b1b;
  background: transparent;
  color: #8b1b1b;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-outline:hover,
.btn-outline:focus-visible {
  background: #8b1b1b;
  color: #fdf7ee;
}

.hint {
  font-size: 0.75rem;
  opacity: 0.75;
}

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 0;
}
.section:last-of-type {
  padding-bottom: 3rem;
}
.section-head {
  margin-bottom: 1.5rem;
}
.section-head h2 {
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
}
.section-intro {
  margin: 0;
  font-size: 0.9rem;
  max-width: 40rem;
}

.section-grid {
  display: grid;
  gap: 1.5rem;
}
.section-grid.two {
  grid-template-columns: repeat(2, minmax(0,1fr));
}
.section-grid.three {
  grid-template-columns: repeat(3, minmax(0,1fr));
}

.card {
  background: rgba(255,255,255,0.65);
  border-radius: 16px;
  padding: 1.25rem 1.25rem 1.35rem;
  border: 1px solid rgba(0,0,0,0.1);
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 0.96rem;
}
.card p {
  margin: 0 0 0.75rem;
  font-size: 0.86rem;
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.84rem;
}
.link-list li + li {
  margin-top: 0.25rem;
}
.link-list.inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}
.link-list.two-col {
  columns: 2;
  column-gap: 1.25rem;
}

.dealer-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.dealer-form-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}
.field.small .field-input {
  max-width: 6rem;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(0,0,0,0.08);
}
.step-item {
  padding: 1.3rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.step-item h3 {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
}
.step-item p {
  margin: 0;
  font-size: 0.86rem;
}

.section-brand {
  margin-top: 1.5rem;
}
.brand-copy {
  font-size: 0.9rem;
}
.bullet-list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.86rem;
}
.bullet-list li + li {
  margin-top: 0.35rem;
}

.site-footer {
  border-top: 1px solid rgba(0,0,0,0.12);
  margin-top: 2.5rem;
}
.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem 1.6rem;
  font-size: 0.78rem;
  color: #4a3729;
}
.footer-brand {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 0.25rem;
}
.footer-note {
  margin: 0;
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 0.5rem;
  }
  .main-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
  .hero-inner {
    grid-template-columns: minmax(0,1fr);
    gap: 2rem;
  }
  .hero-panel {
    order: -1;
  }
  .section-grid.two,
  .section-grid.three {
    grid-template-columns: minmax(0,1fr);
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding-inline: 1rem;
  }
  .hero-inner,
  .section,
  .footer-inner {
    padding-inline: 1rem;
  }
  .dealer-form-row {
    flex-direction: column;
    align-items: stretch;
  }
  .field-grid {
    grid-template-columns: minmax(0,1fr);
  }
}