:root {
  color-scheme: light;
  --ink: #182126;
  --muted: #5e6a70;
  --paper: #fbfaf7;
  --line: #d9dedb;
  --teal: #007f78;
  --teal-deep: #005b59;
  --amber: #d8902a;
  --clay: #b5573d;
  --charcoal: #101416;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(16, 20, 22, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    Inter, "Noto Sans JP", "Noto Sans SC", "Hiragino Sans", "Yu Gothic", Arial,
    sans-serif;
  line-height: 1.6;
}

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

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  gap: 24px;
  align-items: center;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(251, 250, 247, 0.92);
  border-bottom: 1px solid rgba(217, 222, 219, 0.85);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--white);
  background: var(--teal-deep);
  border-radius: 8px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
  line-height: 1.2;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.main-nav {
  display: flex;
  gap: 22px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

.main-nav a {
  transition:
    color 180ms ease,
    transform 180ms ease;
}

.main-nav a:hover {
  color: var(--teal-deep);
}

.language-switcher {
  display: inline-grid;
  grid-template-columns: repeat(3, minmax(48px, 1fr));
  gap: 4px;
  padding: 4px;
  background: #ece8df;
  border: 1px solid rgba(217, 222, 219, 0.9);
  border-radius: 8px;
}

.lang-button {
  min-height: 32px;
  padding: 0 10px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

.lang-button.is-active {
  color: var(--ink);
  background: var(--white);
  box-shadow: 0 3px 12px rgba(16, 20, 22, 0.08);
}

.hero {
  position: relative;
  min-height: 82vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: var(--charcoal);
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(12, 17, 18, 0.88) 0%, rgba(12, 17, 18, 0.62) 42%, rgba(12, 17, 18, 0.18) 100%),
    linear-gradient(0deg, rgba(12, 17, 18, 0.28), rgba(12, 17, 18, 0.08));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(700px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 88px);
  padding: 54px 0;
  color: var(--white);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(46px, 8vw, 92px);
  line-height: 1;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(18px, 2.2vw, 25px);
}

.hero-actions,
.contact-section {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 36px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

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

.button.primary {
  color: var(--white);
  background: var(--teal);
  box-shadow: 0 12px 30px rgba(0, 91, 89, 0.24);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.08);
}

.intro-band {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.intro-grid article {
  padding: 28px clamp(18px, 3vw, 34px);
  border-left: 1px solid var(--line);
}

.intro-grid article:last-child {
  border-right: 1px solid var(--line);
}

.intro-grid span {
  display: block;
  color: var(--teal-deep);
  font-size: 22px;
  font-weight: 900;
}

.intro-grid p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.section {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(68px, 9vw, 110px) 0;
}

.section-heading {
  max-width: 760px;
}

h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow),
.feature-panel p:not(.eyebrow),
.contact-section p:not(.eyebrow) {
  max-width: 700px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.solution-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.solution-card {
  min-height: 260px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(16, 20, 22, 0.06);
}

.card-icon {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  margin-bottom: 26px;
  color: var(--teal-deep);
  background: #e7f2ef;
  border-radius: 8px;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.solution-card h3,
.feature-item h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.25;
}

.solution-card p,
.feature-item p,
.process-list p {
  margin: 12px 0 0;
  color: var(--muted);
}

.split-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(34px, 6vw, 74px);
  align-items: start;
  border-top: 1px solid var(--line);
}

.feature-panel {
  position: sticky;
  top: 104px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-item {
  min-height: 205px;
  padding: 28px;
  background: var(--white);
}

.feature-item span {
  display: block;
  margin-bottom: 44px;
  color: var(--clay);
  font-weight: 900;
}

.process-section {
  border-top: 1px solid var(--line);
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  overflow: hidden;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.process-list li {
  min-height: 190px;
  padding: 26px;
  background: #f7f3eb;
}

.process-list strong {
  display: block;
  color: var(--teal-deep);
  font-size: 18px;
}

.contact-section {
  justify-content: space-between;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto clamp(54px, 8vw, 86px);
  padding: clamp(34px, 6vw, 58px);
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(0, 91, 89, 0.98), rgba(16, 20, 22, 0.98)),
    var(--teal-deep);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact-section h2,
.contact-section p {
  color: var(--white);
}

.contact-section p {
  opacity: 0.82;
}

.contact-details {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.contact-details p {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  max-width: 760px;
  margin: 0;
  font-size: 15px;
  opacity: 0.92;
}

.contact-details span {
  color: rgba(255, 255, 255, 0.66);
  font-weight: 800;
}

.contact-details a {
  color: var(--white);
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.38);
  text-underline-offset: 4px;
}

.contact-button {
  background: var(--amber) !important;
  box-shadow: none !important;
  white-space: nowrap;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(18px, 4vw, 56px);
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
}

@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .main-nav {
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .language-switcher {
    width: min(100%, 340px);
  }

  .hero {
    min-height: 76vh;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(12, 17, 18, 0.9), rgba(12, 17, 18, 0.62)),
      linear-gradient(0deg, rgba(12, 17, 18, 0.32), rgba(12, 17, 18, 0.1));
  }

  .intro-grid,
  .solution-list,
  .split-section,
  .process-list {
    grid-template-columns: 1fr;
  }

  .intro-grid article,
  .intro-grid article:last-child {
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .feature-panel {
    position: static;
  }

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

@media (max-width: 620px) {
  .site-header {
    position: static;
  }

  .brand {
    align-items: flex-start;
  }

  .main-nav {
    gap: 16px;
    font-size: 13px;
  }

  .hero {
    min-height: 70vh;
  }

  .hero-content {
    width: min(100% - 32px, 560px);
    margin: 0 auto;
  }

  .hero-actions,
  .contact-section {
    align-items: stretch;
  }

  .button,
  .contact-button {
    width: 100%;
  }

  .solution-card,
  .feature-item,
  .process-list li {
    min-height: 0;
  }

  .contact-section {
    display: block;
  }

  .contact-details p {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .contact-button {
    margin-top: 26px;
  }

  .site-footer {
    display: block;
  }

  .site-footer p + p {
    margin-top: 8px;
  }
}