:root {
  --ink: #07111f;
  --ink-soft: #344154;
  --muted: #6b7280;
  --line: #d9e0e8;
  --paper: #f7f8fa;
  --white: #ffffff;
  --navy: #0f2438;
  --blue: #0b5d87;
  --steel: #657487;
  --sand: #c8b27c;
  --shadow: 0 18px 48px rgba(15, 36, 56, 0.12);
  --container: min(1180px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "IBM Plex Sans JP", system-ui, sans-serif;
  line-height: 1.7;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(11, 93, 135, 0.4);
  outline-offset: 4px;
}

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

.skip-link:focus {
  position: fixed;
  z-index: 100;
  top: 14px;
  left: 14px;
  width: auto;
  height: auto;
  padding: 10px 14px;
  color: var(--white);
  background: var(--blue);
  clip: auto;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  width: 100%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--white);
  transition: background 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.site-header.is-scrolled,
body.nav-open .site-header {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
  border-color: var(--line);
  box-shadow: 0 10px 30px rgba(7, 17, 31, 0.08);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  width: min(214px, 30vw);
  min-width: 176px;
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.36);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 28px rgba(7, 17, 31, 0.14);
}

.site-header.is-scrolled .brand,
body.nav-open .brand {
  border-color: rgba(217, 224, 232, 0.86);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: none;
}

.brand-logo {
  width: 100%;
  height: auto;
  max-height: 58px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  min-height: 40px;
  padding: 8px 13px;
  border-radius: 4px;
  color: currentColor;
  font-size: 14px;
  font-weight: 600;
  transition: background 180ms ease, color 180ms ease;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.16);
}

.site-header.is-scrolled .site-nav a:hover,
body.nav-open .site-nav a:hover {
  background: #edf2f7;
}

.site-nav .nav-contact {
  margin-left: 8px;
  color: var(--white);
  background: var(--blue);
}

.site-nav .nav-contact:hover {
  color: var(--white);
  background: #074b70;
}

.language-switcher {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
}

.site-header.is-scrolled .language-switcher,
body.nav-open .language-switcher {
  border-color: var(--line);
  background: #f1f5f9;
}

.nav-language-switcher {
  display: none;
}

.lang-button {
  min-width: 42px;
  min-height: 32px;
  padding: 5px 9px;
  border: 0;
  border-radius: 3px;
  color: currentColor;
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  transition: background 180ms ease, color 180ms ease;
}

.lang-button:hover {
  background: rgba(255, 255, 255, 0.14);
}

.site-header.is-scrolled .lang-button:hover,
body.nav-open .lang-button:hover {
  background: #e2e8f0;
}

.lang-button.is-active {
  color: var(--white);
  background: var(--blue);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid currentColor;
  border-radius: 4px;
  color: currentColor;
  background: transparent;
  cursor: pointer;
}

.nav-toggle-line,
.nav-toggle-line::before,
.nav-toggle-line::after {
  display: block;
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: currentColor;
  content: "";
  transition: transform 180ms ease, opacity 180ms ease;
}

.nav-toggle-line::before {
  transform: translateY(-7px);
}

.nav-toggle-line::after {
  transform: translateY(5px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line {
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line::before {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line::after {
  transform: translateY(-2px) rotate(-90deg);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(5, 14, 26, 0.94) 0%, rgba(5, 14, 26, 0.72) 43%, rgba(5, 14, 26, 0.22) 100%),
    linear-gradient(0deg, rgba(5, 14, 26, 0.75) 0%, rgba(5, 14, 26, 0) 48%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 170px 0 46px;
}

.section-kicker {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero .section-kicker {
  color: #d5c38e;
}

.hero h1,
.intro-grid h2,
.section-heading h2,
.quality-layout h2,
.contact-card h2 {
  margin: 0;
  font-family: "Noto Serif JP", serif;
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 850px;
  font-size: clamp(40px, 5.3vw, 76px);
}

.hero-copy {
  max-width: 650px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(16px, 1.8vw, 19px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-weight: 700;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--white);
  background: var(--blue);
}

.button-primary:hover {
  background: #074b70;
}

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.48);
  background: rgba(255, 255, 255, 0.08);
}

.button-secondary:hover {
  border-color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.14);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 820px;
  margin: 64px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.28);
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-facts div {
  min-height: 96px;
  padding: 19px 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
}

.hero-facts dt {
  margin-bottom: 6px;
  color: rgba(255, 255, 255, 0.64);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-facts dd {
  margin: 0;
  color: var(--white);
  font-weight: 700;
}

.intro-band {
  padding: 58px 0;
  color: var(--white);
  background: var(--navy);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(280px, 1fr);
  gap: 56px;
  align-items: start;
}

.intro-grid h2 {
  max-width: 520px;
  font-size: clamp(28px, 3.2vw, 44px);
}

.intro-grid p:last-child {
  max-width: 660px;
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.77);
  font-size: 17px;
}

.section {
  padding: 92px 0;
}

.split,
.company-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.36fr) minmax(0, 1fr);
  gap: 62px;
}

.section-heading h2,
.quality-layout h2,
.contact-card h2 {
  font-size: clamp(30px, 3.5vw, 48px);
}

.section-heading-wide {
  max-width: 780px;
  margin-bottom: 34px;
}

.section-heading-wide p:last-child {
  margin: 18px 0 0;
  color: var(--ink-soft);
}

.business-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.service-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 0.7fr) minmax(280px, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 28px;
  background: var(--white);
}

.service-number {
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.service-item h3,
.product-card h3,
.quality-list h3 {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}

.service-item p,
.quality-list p {
  margin: 0;
  color: var(--ink-soft);
}

.products-section {
  background: var(--white);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  min-height: 510px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.86);
}

.product-body {
  padding: 26px;
}

.product-illustration {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.16) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(rgba(255, 255, 255, 0.13) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(135deg, #10283d 0%, #19384f 48%, #eff3f7 48%, #d9e2ea 100%);
}

.product-illustration::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 36%;
  background: linear-gradient(180deg, rgba(7, 17, 31, 0), rgba(7, 17, 31, 0.22));
  content: "";
}

.box {
  position: absolute;
  display: block;
  border: 1px solid rgba(92, 62, 28, 0.22);
  background:
    linear-gradient(90deg, transparent 46%, rgba(78, 53, 26, 0.16) 47%, rgba(78, 53, 26, 0.16) 53%, transparent 54%),
    #c49255;
  box-shadow: 0 18px 30px rgba(7, 17, 31, 0.24);
}

.box-large {
  right: 18%;
  bottom: 18%;
  width: 34%;
  height: 34%;
}

.box-medium {
  right: 42%;
  bottom: 19%;
  width: 26%;
  height: 27%;
  background-color: #d2a365;
}

.box-small {
  right: 30%;
  bottom: 48%;
  width: 23%;
  height: 22%;
  background-color: #b98245;
}

.film-roll {
  position: absolute;
  display: block;
  border-radius: 999px;
  background:
    radial-gradient(circle at 50% 50%, #8a6b3b 0 14%, #f2f6f8 15% 28%, transparent 29%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.84), rgba(202, 214, 222, 0.76), rgba(255, 255, 255, 0.9));
  box-shadow: 0 20px 30px rgba(7, 17, 31, 0.22);
}

.film-roll-one {
  left: 12%;
  bottom: 20%;
  width: 24%;
  height: 18%;
  transform: rotate(-9deg);
}

.film-roll-two {
  left: 24%;
  bottom: 35%;
  width: 16%;
  height: 32%;
  transform: rotate(4deg);
}

.tape-roll {
  position: absolute;
  right: 12%;
  bottom: 58%;
  width: 17%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, #f8fafc 0 22%, #9f6c2f 23% 36%, transparent 37%),
    conic-gradient(from 40deg, #efe3b8, #c8b27c, #f8edc8, #b99b5f, #efe3b8);
  box-shadow: 0 16px 24px rgba(7, 17, 31, 0.2);
}

.product-label {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.product-card ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
}

.product-card li {
  position: relative;
  padding-left: 18px;
}

.product-card li::before {
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 6px;
  height: 6px;
  background: var(--sand);
  content: "";
}

.product-card-dark {
  justify-content: center;
  gap: 0;
  padding: 10px;
  color: var(--white);
  background: var(--navy);
  border-color: var(--navy);
}

.product-spec {
  padding: 28px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.product-spec:last-child {
  border-bottom: 0;
}

.product-spec span {
  display: block;
  margin-bottom: 8px;
  color: #d5c38e;
  font-size: 13px;
  font-weight: 700;
}

.product-spec strong {
  display: block;
  font-size: 22px;
  line-height: 1.45;
}

.quality-section {
  padding: 96px 0;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(7, 17, 31, 0.94), rgba(7, 17, 31, 0.82)),
    url("https://images.unsplash.com/photo-1587293852726-70cdb56c2866?auto=format&fit=crop&w=2200&q=82") center / cover;
}

.quality-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1fr);
  gap: 72px;
}

.quality-list {
  display: grid;
  gap: 16px;
}

.quality-list article {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
}

.quality-list h3 {
  color: var(--white);
}

.quality-list p {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.74);
}

.company-section {
  background: var(--paper);
}

.company-table {
  margin: 0;
  border-top: 1px solid var(--line);
}

.company-table div {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 30px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.company-table dt {
  color: var(--muted);
  font-weight: 700;
}

.company-table dd {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
}

.company-table a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.contact-section {
  padding: 30px 0 86px;
  background: var(--paper);
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(330px, 0.72fr);
  gap: 46px;
  align-items: center;
  padding: 42px;
  color: var(--white);
  background: var(--navy);
  box-shadow: var(--shadow);
}

.contact-card p:not(.section-kicker) {
  max-width: 640px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.76);
}

.contact-methods {
  display: grid;
  gap: 12px;
}

.contact-methods a {
  display: block;
  padding: 19px 20px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  transition: background 180ms ease, transform 180ms ease;
}

.contact-methods a:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.1);
}

.contact-methods span {
  display: block;
  margin-bottom: 4px;
  color: #d5c38e;
  font-size: 13px;
  font-weight: 700;
}

.contact-methods strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: clamp(18px, 2.5vw, 24px);
}

.site-footer {
  padding: 24px 0;
  color: rgba(255, 255, 255, 0.68);
  background: #050e1a;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 900px) {
  :root {
    --container: min(100vw - 28px, 760px);
  }

  .header-inner {
    min-height: 68px;
  }

  .nav-toggle {
    order: 3;
    flex: 0 0 auto;
    margin-left: auto;
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: fixed;
    top: 68px;
    right: 14px;
    left: 14px;
    display: none;
    padding: 10px;
    border: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .language-switcher {
    order: 2;
    margin-left: auto;
  }

  .brand {
    order: 1;
  }

  body.nav-open .site-nav {
    display: grid;
  }

  .site-nav a {
    padding: 12px;
    color: var(--ink);
  }

  .site-nav .nav-contact {
    margin-left: 0;
    text-align: center;
  }

  .hero {
    min-height: 860px;
  }

  .hero-content {
    padding: 136px 0 36px;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(5, 14, 26, 0.95) 0%, rgba(5, 14, 26, 0.78) 64%, rgba(5, 14, 26, 0.42) 100%),
      linear-gradient(0deg, rgba(5, 14, 26, 0.72) 0%, rgba(5, 14, 26, 0) 52%);
  }

  .intro-grid,
  .split,
  .quality-layout,
  .company-grid,
  .contact-card {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .section {
    padding: 68px 0;
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .product-card {
    min-height: auto;
  }

  .company-table div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .contact-card {
    padding: 30px 24px;
  }
}

@media (max-width: 560px) {
  .header-inner {
    position: relative;
    gap: 6px;
  }

  .brand {
    width: 146px;
    min-width: 0;
    padding: 5px 7px;
  }

  .header-inner > .language-switcher {
    display: none;
  }

  .nav-language-switcher {
    display: flex;
    justify-content: stretch;
    padding: 2px;
  }

  .nav-language-switcher .lang-button {
    flex: 1 1 0;
  }

  .lang-button {
    min-width: 26px;
    min-height: 28px;
    padding: 4px 5px;
    font-size: 11px;
  }

  .nav-toggle {
    position: absolute;
    top: 14px;
    right: 0;
    z-index: 2;
    width: 40px;
    height: 40px;
  }

  .hero {
    min-height: 780px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .button {
    width: 100%;
  }

  .hero-facts {
    grid-template-columns: 1fr;
    margin-top: 44px;
  }

  .intro-band,
  .quality-section {
    padding: 58px 0;
  }

  .product-spec strong {
    font-size: 19px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}