:root {
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #eef2f7;
  --color-text: #11151c;
  --color-text-soft: #556070;
  --color-border: rgba(17, 21, 28, 0.1);
  --color-line: rgba(86, 103, 122, 0.18);
  --color-accent: #cfe1ff;
  --color-accent-strong: #7ea7f6;
  --color-shadow: 0 24px 80px rgba(17, 21, 28, 0.08);
  --font-display: "Inter", sans-serif;
  --font-body: "Noto Sans JP", sans-serif;
  --container-width: min(1180px, calc(100% - 48px));
  --header-height: 82px;
  --transition: 220ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(207, 225, 255, 0.88), transparent 28%),
    linear-gradient(180deg, #fbfcfe 0%, #f3f6fb 100%);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
}

body.menu-open {
  overflow: hidden;
}

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

button {
  font: inherit;
}

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

.container {
  width: var(--container-width);
  margin: 0 auto;
}

.section-spacing {
  padding: 120px 0;
}

.section-eyebrow {
  margin: 0 0 20px;
  color: #68758a;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-heading {
  display: grid;
  gap: 18px;
}

.section-heading h2 {
  margin: 0;
  max-width: 12ch;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.75rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(18px);
  background: rgba(245, 247, 251, 0.78);
  border-bottom: 1px solid rgba(17, 21, 28, 0.06);
}

.header-inner {
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-logo-mark {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, #11151c, #9db9f4);
  box-shadow: 0 0 0 6px rgba(126, 167, 246, 0.15);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 26px;
}

.site-nav a,
.footer-links a,
.footer-policy a {
  position: relative;
  color: var(--color-text-soft);
  transition: color var(--transition);
}

.site-nav a::after,
.footer-links a::after,
.footer-policy a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.site-nav a:hover,
.footer-links a:hover,
.footer-policy a:hover {
  color: var(--color-text);
}

.site-nav a:hover::after,
.footer-links a:hover::after,
.footer-policy a:hover::after {
  transform: scaleX(1);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 20px;
}

.language-switch {
  display: flex;
  gap: 8px;
  color: #7a879a;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.language-switch .is-active {
  color: var(--color-text);
}

.menu-toggle,
.menu-close {
  display: none;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-toggle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
}

.menu-toggle span {
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu-inner {
  width: min(100%, 680px);
  min-height: min(78vh, 720px);
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(238, 242, 247, 0.95));
  box-shadow: var(--color-shadow);
}

.mobile-menu-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
}

.mobile-menu-label {
  color: #6b788b;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.menu-close {
  display: inline-flex;
  color: var(--color-text);
  padding: 0;
}

.mobile-nav {
  display: grid;
  gap: 16px;
}

.mobile-nav a {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.hero-section {
  padding: 88px 0 80px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
  min-height: calc(100vh - var(--header-height) - 88px);
}

.hero-copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(4rem, 9vw, 8.8rem);
  line-height: 0.88;
  letter-spacing: -0.07em;
}

.hero-lead {
  max-width: 30rem;
  margin: 24px 0 0;
  color: var(--color-text-soft);
  font-size: clamp(1.02rem, 2vw, 1.28rem);
}

.hero-actions,
.section-actions {
  display: flex;
  gap: 14px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: #11151c;
  color: #ffffff;
}

.button-primary:hover {
  background: #1b2330;
}

.button-secondary {
  border-color: var(--color-border);
  background: rgba(255, 255, 255, 0.7);
  color: var(--color-text);
}

.button-secondary:hover {
  border-color: rgba(17, 21, 28, 0.22);
  background: #ffffff;
}

.hero-visual {
  position: relative;
  min-height: 620px;
  border-radius: 32px;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.88), rgba(232, 239, 249, 0.96)),
    var(--color-surface);
  border: 1px solid rgba(126, 167, 246, 0.16);
  box-shadow: var(--color-shadow);
}

.hero-orbit,
.hero-grid-lines,
.hero-dot {
  position: absolute;
}

.hero-orbit {
  border-radius: 50%;
  border: 1px solid rgba(126, 167, 246, 0.34);
}

.hero-orbit-large {
  inset: 12% 10% auto auto;
  width: 380px;
  height: 380px;
}

.hero-orbit-small {
  left: 10%;
  bottom: 18%;
  width: 180px;
  height: 180px;
}

.hero-grid-lines {
  inset: 0;
  background-image:
    linear-gradient(rgba(17, 21, 28, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 21, 28, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 88%);
}

.hero-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #11151c;
}

.hero-dot-1 {
  left: 16%;
  top: 20%;
}

.hero-dot-2 {
  right: 16%;
  bottom: 16%;
  background: #7ea7f6;
}

.hero-card {
  position: absolute;
  left: 48px;
  bottom: 44px;
  width: min(320px, calc(100% - 96px));
  padding: 22px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(17, 21, 28, 0.06);
  backdrop-filter: blur(16px);
}

.hero-card-label {
  display: inline-block;
  margin-bottom: 14px;
  color: #68758a;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-card p,
.message-copy p,
.careers-copy p,
.contact-panel h2 {
  margin: 0;
}

.message-layout,
.careers-layout {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 48px;
  align-items: start;
}

.message-copy {
  display: grid;
  gap: 22px;
  color: var(--color-text-soft);
  font-size: 1.03rem;
}

.message-lead {
  color: var(--color-text);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.5;
}

.business-grid,
.works-grid,
.sustainability-grid {
  display: grid;
  gap: 20px;
}

.business-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 52px;
}

.business-card,
.sustainability-card {
  display: grid;
  gap: 18px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.82);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.business-card:hover,
.sustainability-card:hover,
.work-card:hover {
  transform: translateY(-4px);
  border-color: rgba(17, 21, 28, 0.16);
  box-shadow: 0 16px 40px rgba(17, 21, 28, 0.06);
}

.business-card h3,
.sustainability-card h3,
.work-body h3,
.footer-links h3 {
  margin: 0;
  font-family: var(--font-display);
}

.business-card p,
.sustainability-card p,
.work-body p,
.footer-brand p,
.company-table td,
.company-table th {
  margin: 0;
  color: var(--color-text-soft);
}

.business-card a {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
}

.business-card a::after {
  content: "→";
}

.works-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 52px;
}

.work-card {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.work-image {
  overflow: hidden;
}

.image-placeholder {
  position: relative;
  min-height: 320px;
  background: linear-gradient(135deg, #dfe8f7, #f7f9fc);
}

.image-placeholder::before,
.image-placeholder::after {
  content: "";
  position: absolute;
  inset: auto;
  border-radius: 50%;
  filter: blur(10px);
}

.image-placeholder::before {
  top: 18%;
  right: 12%;
  width: 110px;
  height: 110px;
  background: rgba(126, 167, 246, 0.22);
}

.image-placeholder::after {
  left: 12%;
  bottom: 14%;
  width: 150px;
  height: 150px;
  background: rgba(17, 21, 28, 0.08);
}

.image-placeholder span {
  position: absolute;
  left: 24px;
  bottom: 22px;
  color: #6b788b;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.image-blue {
  background:
    linear-gradient(135deg, rgba(222, 234, 255, 0.94), rgba(255, 255, 255, 1)),
    linear-gradient(45deg, #f7fbff, #e7f0ff);
}

.image-gray {
  background:
    linear-gradient(135deg, rgba(236, 240, 245, 0.94), rgba(255, 255, 255, 1)),
    linear-gradient(45deg, #ffffff, #edf1f5);
}

.image-silver {
  background:
    linear-gradient(135deg, rgba(231, 236, 244, 0.96), rgba(246, 248, 252, 1)),
    linear-gradient(45deg, #f5f8fd, #dfe8f6);
}

.image-white {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(236, 242, 248, 1)),
    linear-gradient(45deg, #ffffff, #eaf1f8);
}

.image-office {
  min-height: 480px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.02)),
    radial-gradient(circle at 20% 20%, rgba(126, 167, 246, 0.28), transparent 22%),
    radial-gradient(circle at 76% 36%, rgba(17, 21, 28, 0.12), transparent 20%),
    linear-gradient(160deg, #dde7f7, #f7f9fc);
}

.work-card:hover .image-placeholder {
  transform: scale(1.04);
}

.image-placeholder {
  transition: transform 420ms ease;
}

.work-body {
  padding: 24px 24px 28px;
  display: grid;
  gap: 10px;
}

.work-category,
.news-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #6b788b;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.news-header {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  align-items: end;
}

.news-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.news-filter {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: #617084;
  cursor: pointer;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.news-filter.is-active,
.news-filter:hover {
  background: #11151c;
  border-color: #11151c;
  color: #ffffff;
}

.news-list {
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
}

.news-item {
  display: grid;
  grid-template-columns: 120px 110px 1fr;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-border);
}

.news-item a {
  font-size: 1.02rem;
}

.news-item.is-hidden {
  display: none;
}

.sustainability-section {
  background: rgba(238, 242, 247, 0.88);
}

.sustainability-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 52px;
}

.careers-layout {
  align-items: center;
}

.careers-copy {
  display: grid;
  gap: 24px;
}

.careers-copy h2,
.contact-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 4.2rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.careers-visual {
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.company-table-wrap {
  margin-top: 52px;
  border: 1px solid var(--color-border);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.9);
  overflow: hidden;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table tr + tr {
  border-top: 1px solid var(--color-border);
}

.company-table th,
.company-table td {
  padding: 24px 28px;
  text-align: left;
  vertical-align: top;
}

.company-table th {
  width: 180px;
  color: var(--color-text);
  font-weight: 700;
}

.contact-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  padding: 42px;
  border: 1px solid var(--color-border);
  border-radius: 28px;
  background:
    radial-gradient(circle at top right, rgba(207, 225, 255, 0.85), transparent 28%),
    rgba(255, 255, 255, 0.88);
}

.site-footer {
  padding: 40px 0 24px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  padding-bottom: 32px;
}

.footer-brand {
  display: grid;
  gap: 18px;
  max-width: 420px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 28px;
}

.footer-links div {
  display: grid;
  gap: 12px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-soft);
  font-size: 0.94rem;
}

.footer-policy {
  display: flex;
  gap: 18px;
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .site-nav {
    display: none;
  }

  .menu-toggle,
  .menu-close {
    display: inline-flex;
  }

  .hero-grid,
  .message-layout,
  .careers-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 520px;
  }

  .business-grid,
  .works-grid,
  .sustainability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .news-item {
    grid-template-columns: 110px 100px 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --container-width: min(100% - 32px, 100%);
    --header-height: 74px;
  }

  .section-spacing {
    padding: 88px 0;
  }

  .header-inner {
    grid-template-columns: auto auto;
    justify-content: space-between;
    gap: 16px;
  }

  .language-switch {
    display: none;
  }

  .hero-section {
    padding-top: 52px;
  }

  .hero-grid {
    min-height: auto;
    gap: 28px;
  }

  .hero-copy h1 {
    font-size: clamp(3.2rem, 17vw, 5rem);
  }

  .hero-visual {
    min-height: 420px;
  }

  .hero-card {
    left: 20px;
    right: 20px;
    width: auto;
    bottom: 20px;
  }

  .business-grid,
  .works-grid,
  .sustainability-grid {
    grid-template-columns: 1fr;
    margin-top: 36px;
  }

  .news-header,
  .contact-panel,
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .company-table th,
  .company-table td {
    display: block;
    width: auto;
    padding: 16px 20px;
  }

  .company-table td {
    padding-top: 0;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }
}