:root {
  --bg: #f6f2ea;
  --paper: #fffdf8;
  --ink: #262321;
  --soft-ink: #59544d;
  --line: rgba(52, 46, 41, 0.14);
  --line-strong: rgba(52, 46, 41, 0.24);
  --deep: #3b3733;
  --deep-soft: #4a453f;
  --max: 1180px;
  --radius: 28px;
  --shadow: 0 22px 60px rgba(40, 33, 28, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", Meiryo, system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.78;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible {
  outline: 3px solid #111;
  outline-offset: 4px;
}
svg { display: block; width: 100%; height: auto; }
img { max-width: 100%; height: auto; display: block; }
section[id] { scroll-margin-top: 96px; }

.shell {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  min-height: 78px;
  padding: 14px clamp(18px, 3vw, 42px);
  border-bottom: 1px solid rgba(255,255,255,.12);
  background: rgba(59,55,51,.92);
  backdrop-filter: blur(14px);
}
.site-header > * {
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  font-weight: 800;
  letter-spacing: .08em;
  color: #fff;
}
.brand-mark {
  display: inline-block;
  width: 42px;
  min-width: 42px;
  flex: 0 0 42px;
}
.brand-mark img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}
.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1;
}
.brand-ja {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
}
.brand-en {
  font-family: "Inter", "Noto Sans JP", sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  color: rgba(255,255,255,.82);
}

.nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(12px, 1.8vw, 24px);
  color: rgba(255,255,255,.82);
  font-size: 14px;
  font-weight: 700;
}
.nav a {
  position: relative;
  padding: 8px 0;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: #fff;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}
.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-contact,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .04em;
  transition: transform .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}
.header-contact {
  color: var(--ink);
  background: #f8f4ec;
}
.button:hover,
.header-contact:hover {
  transform: translateY(-1px);
}
.button.primary {
  color: #fff;
  background: var(--deep);
  border: 1px solid var(--deep);
}
.button.secondary {
  color: #fff;
  border: 1px solid rgba(255,255,255,.42);
  background: transparent;
}
.button.invert {
  color: #111;
  background: #fff;
  border-color: #fff;
}

.menu-button {
  display: none;
  color: #fff;
  border: 0;
  background: transparent;
}
.menu-button span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 0 auto 4px;
  background: currentColor;
}
.menu-button b {
  font-size: 10px;
  letter-spacing: .08em;
}
.mobile-nav-contact { display: none; }

.hero {
  position: relative;
  overflow: hidden;
  min-height: calc(100svh - 78px);
  padding: clamp(72px, 10vw, 120px) 0 48px;
  color: #fff;
  background:
    linear-gradient(135deg, transparent 0 40%, rgba(255,255,255,.05) 40% 40.8%, transparent 40.8% 100%),
    radial-gradient(circle at 78% 32%, rgba(255,255,255,.04), transparent 28%),
    linear-gradient(180deg, #4a453f 0%, #38342f 100%);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.035) 0 48%, transparent 48% 100%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 780px);
  gap: 0;
  align-items: center;
}
.hero-copy,
.hero-visual {
  min-width: 0;
}
.eyebrow,
.section-no {
  margin: 0 0 14px;
  font-family: "Inter", "Noto Sans JP", sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
}
.hero h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.08;
  letter-spacing: -.06em;
}
.hero h1 span {
  display: inline-block;
  margin-top: 8px;
  padding: .02em .2em .08em;
  color: var(--ink);
  background: #f4ede2;
}
.hero-lead {
  max-width: 720px;
  margin: 28px 0 34px;
  color: rgba(255,255,255,.82);
  font-size: clamp(15px, 1.3vw, 18px);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}
.hero-disc {
  width: min(100%, 420px);
  margin-inline: auto;
  filter: drop-shadow(0 28px 60px rgba(0,0,0,.22));
}
.hero-disc img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
}
.hero-caption {
  position: absolute;
  right: 0;
  bottom: 4%;
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(255,255,255,.94);
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.09);
  backdrop-filter: blur(8px);
}
.trust-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 42px 0 0;
  padding: 0;
  list-style: none;
}
.trust-strip li {
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: #f8f3eb;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.section {
  position: relative;
  padding: clamp(74px, 9vw, 118px) 0;
}
.section-light { background: var(--paper); }
.section-dark {
  color: var(--ink);
  background: #e7e0d4;
}
.section-accent {
  background: linear-gradient(135deg, #f3eee6 0 58%, #ddd4c6 58% 100%);
}
.section-heading {
  margin-bottom: 34px;
}
.section-heading h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.12;
  letter-spacing: -.05em;
}
.section-heading .lead {
  max-width: 840px;
  margin: 18px 0 0;
  color: var(--soft-ink);
  font-size: 17px;
}
.section-dark .lead,
.section-dark .section-no,
.section-dark .section-heading h2 {
  color: var(--ink);
}
.section-dark .lead { color: var(--soft-ink); }

.request-list,
.service-grid,
.feature-list,
.process-list,
.company-list,
.contact-info ul {
  margin: 0;
  padding: 0;
}

.request-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
}
.request-list li,
.service-card,
.model-grid article,
.process-list li,
.company-panel,
.contact-panel,
.contact-form {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.request-list li {
  padding: 24px 24px 22px;
  border: 1px solid var(--line-strong);
  background: #fff;
}
.request-list strong,
.service-card h3,
.feature-list h3,
.model-grid h3,
.process-list h3,
.contact-panel h2 {
  display: block;
  margin: 0 0 10px;
  font-size: clamp(22px, 2.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.04em;
}
.request-list small {
  color: var(--soft-ink);
  font-size: 14px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.service-card {
  padding: 28px 24px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(255,255,255,.88), rgba(250,246,239,.94));
}
.service-card ul {
  margin: 18px 0 0;
  padding-left: 18px;
}
.service-card li + li { margin-top: 8px; }

.feature-list {
  border-top: 1px solid var(--line-strong);
}
.feature-list article {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.feature-list span,
.process-list span {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .18em;
}
.feature-list p,
.model-grid p,
.process-list p,
.process-note,
.company-list dd,
.contact-copy,
.contact-info,
.contact-info li {
  color: var(--soft-ink);
}

.modeling-layout {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 24px;
  align-items: start;
}
.model-grid {
  display: grid;
  gap: 16px;
}
.model-grid article {
  padding: 24px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  background: rgba(255,253,248,.88);
  backdrop-filter: blur(8px);
}
.model-grid p { color: var(--soft-ink); }

.process-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
}
.process-list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line-strong);
  background: #fff;
}
.process-note {
  margin: 22px 0 0;
  font-size: 14px;
}

.company-contact {
  padding-top: 0;
}
.company-contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 22px;
}
.company-panel,
.contact-panel {
  padding: 34px 28px;
  background: #fff;
  border: 1px solid var(--line-strong);
}
.company-list {
  border-top: 1px solid var(--line-strong);
}
.company-list div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 10px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.company-list dt {
  font-size: 14px;
  font-weight: 800;
}
.company-list a,
.contact-panel a {
  text-decoration: underline;
  text-underline-offset: 4px;
}
.contact-panel {
  color: var(--ink);
  background: #efe7db;
  border-color: var(--line-strong);
}
.contact-panel .section-no,
.contact-panel h2 { color: var(--ink); }
.contact-copy { color: var(--soft-ink); }
.contact-form {
  margin-top: 26px;
  padding: 22px;
  border: 1px solid var(--line-strong);
  background: rgba(255,253,248,.82);
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}
.field-wide {
  grid-column: 1 / -1;
}
.field span {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
}
.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
  font: inherit;
  line-height: 1.7;
  padding: 14px 15px;
  border-radius: 0;
  appearance: none;
}
.field input::placeholder,
.field textarea::placeholder {
  color: rgba(38,35,33,.46);
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: #8a8175;
  background: #fff;
}
.field textarea {
  min-height: 120px;
  resize: vertical;
}
.form-actions {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}
.form-submit {
  width: 100%;
  cursor: pointer;
}
.contact-panel .button.invert {
  color: #fff;
  background: var(--deep);
  border-color: var(--deep);
}
.form-mail-link,
.form-note {
  color: var(--soft-ink);
  font-size: 13px;
}
.form-mail-link {
  text-decoration: underline;
  text-underline-offset: 4px;
}
.form-note {
  margin: 14px 0 0;
}

.site-footer {
  padding: 24px 0 40px;
  color: #fff;
  background: var(--deep);
  border-top: 1px solid rgba(255,255,255,.12);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.footer-copy {
  margin: 0;
  color: rgba(255,255,255,.6);
  font-size: 14px;
}

@media (max-width: 980px) {
  .hero-grid,
  .modeling-layout,
  .company-contact-grid {
    grid-template-columns: 1fr;
  }
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 16px;
    min-height: 68px;
    padding-inline: 16px;
  }
  .brand-mark {
    width: 38px;
    min-width: 38px;
    flex-basis: 38px;
  }
  .brand-ja {
    font-size: 12px;
  }
  .brand-en {
    font-size: 10px;
  }
  .menu-button {
    display: inline-block;
  }
  .header-contact { display: none; }
  .nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 16px 18px;
    background: rgba(59,55,51,.98);
    border-bottom: 1px solid rgba(255,255,255,.1);
  }
  .nav.is-open { display: flex; }
  .nav a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .mobile-nav-contact { display: block; }
  .trust-strip,
  .request-list,
  .service-grid,
  .process-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .shell { width: min(calc(100% - 28px), var(--max)); }
  section[id] { scroll-margin-top: 78px; }
  .hero { min-height: auto; padding-top: 56px; }
  .hero-disc {
    width: min(100%, 300px);
  }
  .hero-lead,
  .section-heading .lead,
  .contact-copy { font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .button,
  .header-contact { width: 100%; }
  .hero-caption {
    position: static;
    margin-top: 14px;
  }
  .request-list li,
  .service-card,
  .model-grid article,
  .process-list li,
  .company-panel,
  .contact-panel,
  .contact-form {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  }
  .feature-list article,
  .process-list li,
  .company-list div,
  .form-grid {
    grid-template-columns: 1fr;
  }
  .field-wide {
    grid-column: auto;
  }
  .company-list div { gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button,
  .header-contact,
  .nav a::after { transition: none; }
}