:root {
  color-scheme: dark;
  --canvas: #071015;
  --canvas-deep: #040a0e;
  --surface: #0b171e;
  --surface-raised: #10212a;
  --ink: #eef7f8;
  --muted: #9babb4;
  --faint: #708690;
  --line: rgba(169, 201, 214, 0.16);
  --line-strong: rgba(169, 201, 214, 0.28);
  --mint: #78f6cf;
  --blue: #5aa9ff;
  --page-width: 1320px;
  --page-x: clamp(24px, 5vw, 72px);
  --font: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 82% 8%, rgba(90, 169, 255, 0.13), transparent 24%),
    radial-gradient(circle at 18% 48%, rgba(120, 246, 207, 0.05), transparent 28%),
    linear-gradient(145deg, var(--canvas-deep), var(--canvas) 48%, #08131a);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(rgba(153, 190, 203, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(153, 190, 203, 0.035) 1px, transparent 1px);
  background-size: 54px 54px;
  content: "";
  pointer-events: none;
  mask-image: linear-gradient(to bottom, #000, rgba(0, 0, 0, 0.4) 70%, transparent);
}

::selection {
  background: rgba(120, 246, 207, 0.24);
}

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

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

.skip-link {
  position: fixed;
  z-index: 2000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border: 1px solid var(--mint);
  background: var(--canvas-deep);
  color: var(--ink);
  font-size: 13px;
  font-weight: 650;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 12, 17, 0.86);
  backdrop-filter: blur(18px) saturate(140%);
}

.header-wrap {
  display: flex;
  width: min(100%, var(--page-width));
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-inline: auto;
  padding-inline: var(--page-x);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.03em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(120, 246, 207, 0.56);
  border-radius: 50%;
  color: var(--mint);
  font-size: 10px;
}

.brand small {
  margin-left: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 450;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-contact {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 12px;
  font-weight: 650;
}

main,
footer {
  width: min(100%, var(--page-width));
  margin-inline: auto;
}

.case-hero {
  display: grid;
  min-height: 620px;
  grid-template-columns: minmax(0, 0.9fr) minmax(400px, 1.1fr);
  align-items: center;
  gap: clamp(48px, 7vw, 110px);
  padding: 76px var(--page-x) 72px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--mint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.3;
}

.case-hero h1 {
  margin: 0;
  font-size: clamp(52px, 6vw, 86px);
  font-weight: 620;
  letter-spacing: -0.06em;
  line-height: 1.02;
}

.lead {
  max-width: 650px;
  margin: 28px 0 0;
  color: #b6c5cc;
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.85;
}

.case-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.case-actions a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border: 1px solid var(--line-strong);
  font-size: 12px;
  font-weight: 700;
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.case-actions .primary-action {
  border-color: var(--mint);
  background: var(--mint);
  color: var(--canvas-deep);
}

.case-actions a:hover,
.case-actions a:focus-visible {
  border-color: var(--mint);
  background: transparent;
  color: var(--mint);
  transform: translateY(-2px);
}

.case-visual {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: #020609;
  box-shadow: 0 32px 70px rgba(0, 0, 0, 0.38);
}

.case-visual::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(4, 10, 14, 0.76), transparent 62%);
  content: "";
}

.case-visual img {
  width: 100%;
  aspect-ratio: 16 / 10;
  filter: saturate(0.78) contrast(1.06) brightness(0.82);
  object-fit: cover;
  transition:
    filter 220ms ease,
    transform 420ms ease;
}

.case-visual:hover img,
.case-visual:focus-visible img {
  filter: saturate(1) contrast(1.03) brightness(0.94);
  transform: scale(1.025);
}

.play-mark {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border: 1px solid rgba(238, 247, 248, 0.5);
  border-radius: 50%;
  background: rgba(4, 10, 14, 0.76);
  color: var(--mint);
  font-size: 17px;
  transform: translate(-50%, -50%);
}

.visual-label {
  position: absolute;
  z-index: 2;
  right: 18px;
  bottom: 15px;
  color: var(--ink);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0 var(--page-x);
  padding: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.fact-grid div {
  min-width: 0;
  padding: 22px;
  border-right: 1px solid var(--line);
}

.fact-grid div:last-child {
  border-right: 0;
}

.fact-grid dt {
  color: var(--faint);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.fact-grid dd {
  margin: 7px 0 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 610;
  line-height: 1.5;
}

.case-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: clamp(48px, 9vw, 130px);
  margin-inline: var(--page-x);
  padding-block: 104px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 76px;
}

.section-label span {
  display: block;
  margin-bottom: 14px;
  color: var(--mint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.section-label h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 610;
  letter-spacing: -0.045em;
  line-height: 1.2;
}

.section-copy p,
.result-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}

.section-copy .large-copy {
  margin-bottom: 28px;
  color: #d2dee2;
  font-size: clamp(21px, 2.2vw, 31px);
  line-height: 1.7;
}

.responsibility-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
}

.responsibility-grid article {
  min-height: 210px;
  padding: 27px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.responsibility-grid article:nth-child(2n) {
  border-right: 0;
}

.responsibility-grid h3,
.design-points h3 {
  margin: 0 0 13px;
  font-size: 20px;
  font-weight: 610;
  letter-spacing: -0.025em;
  line-height: 1.4;
}

.responsibility-grid p,
.design-points p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.85;
}

.design-points {
  display: grid;
  gap: 38px;
}

.design-points article {
  display: grid;
  grid-template-columns: 100px minmax(180px, 0.8fr) minmax(260px, 1.2fr);
  align-items: start;
  gap: 25px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.design-points article:last-child {
  border-bottom: 0;
}

.design-points strong {
  color: var(--mint);
  font-size: 10px;
  letter-spacing: 0.14em;
}

.result-number {
  margin-bottom: 30px !important;
  color: var(--ink) !important;
  font-size: clamp(48px, 7vw, 92px) !important;
  font-weight: 620;
  letter-spacing: -0.06em;
  line-height: 0.95 !important;
}

.result-number span {
  display: block;
  margin-top: 13px;
  color: var(--mint);
  font-size: 10px;
  letter-spacing: 0.18em;
  line-height: 1.2;
}

.result-copy .note {
  margin-top: 18px;
  color: var(--faint);
  font-size: 11px;
}

.references {
  margin-inline: var(--page-x);
  padding-block: 90px;
}

.references h2 {
  margin: 0 0 35px;
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 610;
  letter-spacing: -0.045em;
}

.reference-links {
  border-top: 1px solid var(--line-strong);
}

.reference-links a {
  display: grid;
  min-height: 86px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.reference-links span {
  color: var(--muted);
  font-size: 14px;
}

.reference-links strong {
  font-size: 13px;
  font-weight: 650;
}

.reference-links a:hover strong,
.reference-links a:focus-visible strong {
  color: var(--mint);
}

.contact-panel {
  position: relative;
  margin: 0 var(--page-x) 80px;
  padding: clamp(48px, 6vw, 82px);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(circle at 84% 24%, rgba(90, 169, 255, 0.18), transparent 30%),
    linear-gradient(130deg, rgba(11, 27, 35, 0.96), rgba(6, 15, 20, 0.98));
}

.contact-panel h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(33px, 4.2vw, 58px);
  font-weight: 610;
  letter-spacing: -0.05em;
  line-height: 1.2;
}

.contact-panel > p:not(.eyebrow) {
  max-width: 680px;
  margin: 23px 0 30px;
  color: var(--muted);
}

.contact-panel a {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  padding: 12px 18px;
  border: 1px solid var(--mint);
  background: var(--mint);
  color: var(--canvas-deep);
  font-size: 13px;
  font-weight: 700;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 36px var(--page-x) 52px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 12px;
}

footer p {
  margin: 0;
}

footer a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 0.28em;
}

*:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}

@media (max-width: 900px) {
  .case-hero {
    grid-template-columns: 1fr;
  }

  .case-visual {
    max-width: 720px;
  }

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

  .fact-grid div {
    border-bottom: 1px solid var(--line);
  }

  .fact-grid div:nth-child(2n) {
    border-right: 0;
  }

  .fact-grid div:last-child {
    border-bottom: 0;
  }

  .case-section {
    grid-template-columns: 1fr;
  }

  .design-points article {
    grid-template-columns: 84px minmax(180px, 0.8fr) minmax(240px, 1.2fr);
  }
}

@media (max-width: 640px) {
  :root {
    --page-x: 20px;
  }

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

  .brand {
    gap: 10px;
    font-size: 13px;
  }

  .brand-mark {
    width: 31px;
    height: 31px;
  }

  .brand small {
    display: none;
  }

  .header-contact {
    padding-inline: 10px;
    font-size: 11px;
  }

  .header-actions {
    gap: 9px;
  }

  .header-actions .language-switcher {
    padding-inline: 9px;
  }

  .case-hero {
    min-height: 0;
    gap: 42px;
    padding-block: 58px 52px;
  }

  .case-hero h1 {
    font-size: clamp(42px, 14vw, 62px);
  }

  .lead {
    font-size: 16px;
  }

  .case-actions {
    display: grid;
  }

  .case-visual img {
    aspect-ratio: 16 / 11;
  }

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

  .fact-grid div,
  .fact-grid div:nth-child(2n) {
    display: grid;
    grid-template-columns: 90px minmax(0, 1fr);
    align-items: center;
    padding: 14px 0;
    border-right: 0;
  }

  .fact-grid dd {
    margin: 0;
  }

  .case-section {
    gap: 36px;
    padding-block: 72px;
  }

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

  .responsibility-grid article,
  .responsibility-grid article:nth-child(2n) {
    min-height: 0;
    padding: 24px 0;
    border-right: 0;
  }

  .design-points {
    gap: 26px;
  }

  .design-points article {
    display: block;
    padding-bottom: 27px;
  }

  .design-points h3 {
    margin-top: 9px;
  }

  .references {
    padding-block: 70px;
  }

  .reference-links a {
    display: block;
    padding-block: 20px;
  }

  .reference-links strong {
    display: block;
    margin-top: 7px;
  }

  .contact-panel {
    margin-inline: 0;
    padding-inline: var(--page-x);
    border-right: 0;
    border-left: 0;
  }

  footer {
    display: block;
  }

  footer a {
    display: inline-block;
    margin-top: 8px;
  }
}

@media (max-width: 380px) {
  .header-contact {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}