:root {
  --blue: #2563eb;
  --blue-deep: #1546bc;
  --ink: #111827;
  --ink-soft: #263244;
  --gray: #6b7280;
  --line: #dfe4ec;
  --paper: #ffffff;
  --wash: #f5f7fb;
  --radius: 1.25rem;
  --shadow: 0 24px 70px rgb(17 24 39 / 10%);
  --shell: min(72rem, calc(100% - 2.5rem));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, Geist, "Helvetica Neue", "Noto Sans JP", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body:lang(ja) {
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", Inter, sans-serif;
  line-break: strict;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 1rem;
  color: white;
  background: var(--ink);
  border-radius: 0.5rem;
  transform: translateY(-200%);
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgb(255 255 255 / 92%);
  border-bottom: 1px solid rgb(223 228 236 / 80%);
  backdrop-filter: blur(18px);
}

.header-inner {
  min-height: 5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  width: 12rem;
  overflow: hidden;
  flex: 0 0 auto;
}

.brand img {
  width: 100%;
  height: auto;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-left: auto;
}

.primary-nav a {
  color: var(--ink-soft);
  font-size: 0.875rem;
  font-weight: 650;
  text-decoration: none;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--blue);
}

.language-switcher {
  display: inline-flex;
  padding: 0.2rem;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.language-switcher button {
  min-height: 2rem;
  padding: 0.25rem 0.65rem;
  color: var(--gray);
  background: transparent;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 750;
}

.language-switcher button[aria-pressed="true"] {
  color: white;
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(5rem, 10vw, 9rem) 0;
  background:
    radial-gradient(circle at 78% 38%, rgb(37 99 235 / 10%), transparent 22rem),
    linear-gradient(180deg, white 0%, #fbfcff 100%);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgb(17 24 39 / 3%) 1px, transparent 1px), linear-gradient(90deg, rgb(17 24 39 / 3%) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: linear-gradient(to bottom, black, transparent 80%);
  content: "";
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(20rem, 0.9fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 14ch;
  margin-bottom: 1.5rem;
  font-size: clamp(2.8rem, 6vw, 5.4rem);
}

body:lang(ja) h1 {
  max-width: 11ch;
  line-height: 1.2;
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.hero-summary {
  max-width: 38rem;
  margin: 0 0 2.25rem;
  color: var(--gray);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
}

.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  color: white;
  background: var(--ink);
  border-radius: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 160ms ease, transform 160ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--blue);
  transform: translateY(-2px);
}

.hero-mark {
  position: relative;
  display: grid;
  min-height: 30rem;
  place-items: center;
}

.mark-frame {
  position: relative;
  z-index: 2;
  overflow: hidden;
  width: min(100%, 26rem);
  background: white;
  border: 1px solid var(--line);
  border-radius: 2rem;
  box-shadow: var(--shadow);
  transform: rotate(-2deg);
}

.mark-frame img {
  width: 100%;
  height: auto;
}

.signal {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.signal span {
  display: block;
  height: 0.42rem;
  border-radius: 999px;
}

.signal-rough {
  z-index: 3;
  top: 17%;
  left: 0;
  align-items: flex-end;
  transform: rotate(-8deg);
}

.signal-rough span {
  width: 4rem;
  background: var(--ink);
}

.signal-rough span:nth-child(2) { width: 6rem; opacity: 0.8; }
.signal-rough span:nth-child(3) { width: 3rem; opacity: 0.55; }
.signal-rough span:nth-child(4) { width: 5rem; opacity: 0.35; }
.signal-rough span:nth-child(5) { width: 2rem; opacity: 0.2; }

.signal-clean {
  right: -1rem;
  bottom: 16%;
}

.signal-clean span {
  width: 7rem;
  background: var(--blue);
}

.signal-clean span:nth-child(2) { width: 5rem; opacity: 0.65; }
.signal-clean span:nth-child(3) { width: 3rem; opacity: 0.3; }

.section {
  padding: clamp(5rem, 9vw, 8rem) 0;
}

.section-heading {
  max-width: 46rem;
  margin-bottom: 3.25rem;
}

.section-heading > p:last-child {
  max-width: 39rem;
  margin-bottom: 0;
  color: var(--gray);
  font-size: 1.1rem;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.service-card {
  min-height: 17rem;
  padding: 2rem;
  background: white;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 160ms ease, transform 160ms ease;
}

.service-card:hover {
  z-index: 1;
  background: var(--wash);
  transform: translateY(-0.35rem);
}

.service-number {
  display: block;
  margin-bottom: 3rem;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.service-card h3 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.service-card p {
  margin: 0;
  color: var(--gray);
}

.method {
  color: white;
  background:
    radial-gradient(circle at 80% 20%, rgb(37 99 235 / 35%), transparent 25rem),
    var(--ink);
}

.method-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: end;
  gap: clamp(3rem, 8vw, 8rem);
}

.section-heading-light {
  margin-bottom: 0;
}

.section-heading-light > p:last-child {
  color: #aeb8c7;
}

.method-steps {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.method-steps li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgb(255 255 255 / 18%);
}

.method-steps li:first-child {
  border-top: 1px solid rgb(255 255 255 / 18%);
}

.method-steps span {
  color: #7e8ca0;
  font-size: 0.75rem;
  font-weight: 750;
}

.method-steps strong {
  font-size: clamp(1.35rem, 3vw, 2.25rem);
  letter-spacing: -0.025em;
}

.principle-inner {
  display: grid;
  grid-template-columns: 0.4fr 1.6fr;
  align-items: start;
  gap: clamp(2rem, 8vw, 7rem);
}

.principle-mark {
  color: var(--blue);
  font-size: clamp(5rem, 12vw, 10rem);
  font-weight: 200;
  line-height: 0.7;
}

.principle h2 {
  max-width: 15ch;
}

.principle p:last-child {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--gray);
  font-size: 1.1rem;
}

.site-footer {
  padding: 2rem 0;
  color: #aeb8c7;
  background: #0b111d;
  border-top: 1px solid rgb(255 255 255 / 10%);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  font-size: 0.85rem;
}

.footer-inner p {
  margin: 0;
}

:focus-visible {
  outline: 3px solid rgb(37 99 235 / 50%);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .primary-nav {
    display: none;
  }

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

  .hero-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .hero-mark {
    min-height: 24rem;
  }

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

  .principle-inner {
    grid-template-columns: 1fr;
  }

  .principle-mark {
    line-height: 0.5;
  }
}

@media (max-width: 580px) {
  :root {
    --shell: min(100% - 1.5rem, 72rem);
  }

  .header-inner {
    min-height: 4.5rem;
    gap: 0.75rem;
  }

  .brand {
    width: 8.5rem;
  }

  .language-switcher button {
    padding-inline: 0.5rem;
    font-size: 0.68rem;
  }

  .hero {
    padding-top: 4.5rem;
  }

  .hero-mark {
    min-height: 19rem;
  }

  .signal {
    display: none;
  }

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

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

  .service-number {
    margin-bottom: 2rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
  }
}

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

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