:root {
  --navy: #183b5b;
  --navy-deep: #102d47;
  --navy-soft: #2a5276;
  --gold: #caa35f;
  --gold-pale: #eadfc9;
  --ink: #171c24;
  --muted: #647181;
  --line: #dbe0e5;
  --paper: #f7f7f5;
  --white: #ffffff;
  --header-height: 78px;
  --page-pad: clamp(24px, 6vw, 88px);
  --max-width: 1440px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "Helvetica Neue", "Noto Sans JP", "Noto Sans SC", "Yu Gothic", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

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

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

button {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 1000;
  padding: 10px 14px;
  background: var(--white);
  color: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(23, 28, 36, 0.1);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: min(100%, var(--max-width));
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--page-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  width: 158px;
  flex: 0 0 auto;
}

.brand img,
.footer-brand img {
  width: 100%;
  mix-blend-mode: multiply;
}

.primary-navigation {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.2vw, 34px);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.primary-navigation > a {
  position: relative;
  padding: 28px 0 26px;
  white-space: nowrap;
}

.primary-navigation > a:not(.nav-contact)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 19px;
  width: 100%;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

.primary-navigation > a:hover::after,
.primary-navigation > a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-contact {
  padding: 10px 18px !important;
  color: var(--white);
  background: var(--navy);
  transition: background 180ms ease;
}

.nav-contact:hover,
.nav-contact:focus-visible {
  background: var(--navy-soft);
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #a2a8ae;
}

.language-switcher button {
  padding: 4px 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
}

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

.menu-button {
  display: none;
}

.hero {
  position: relative;
  min-height: calc(100svh - var(--header-height));
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
  isolation: isolate;
}

.hero::before {
  content: "ARCSET";
  position: absolute;
  right: -0.06em;
  bottom: -0.24em;
  z-index: -1;
  color: rgba(255, 255, 255, 0.035);
  font-size: clamp(9rem, 24vw, 24rem);
  font-weight: 800;
  letter-spacing: -0.08em;
  line-height: 1;
}

.hero-inner {
  width: min(100%, var(--max-width));
  min-height: calc(100svh - var(--header-height) - 62px);
  margin: 0 auto;
  padding: clamp(72px, 10vh, 126px) var(--page-pad) 80px;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.65fr);
  align-items: center;
  gap: clamp(60px, 10vw, 150px);
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--gold);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.3;
}

.eyebrow-dark {
  color: #a97d36;
}

.hero h1,
.section h2,
.execution-section h2,
.contact h2 {
  margin: 0;
  font-size: clamp(3.1rem, 6vw, 6.8rem);
  font-weight: 650;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.heading-line {
  display: block;
  width: max-content;
  max-width: 100%;
  white-space: nowrap;
}

.hero h1 {
  max-width: 950px;
}

.hero-lead {
  max-width: 760px;
  margin: 36px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  line-height: 1.75;
}

.hero-actions {
  margin-top: 42px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 28px;
}

.button {
  min-height: 52px;
  padding: 14px 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  transition: transform 180ms ease, background 180ms ease;
}

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

.button-gold {
  color: var(--navy-deep);
  background: var(--gold);
}

.button-gold:hover,
.button-gold:focus-visible {
  background: #d9b875;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
  font-size: 0.88rem;
  font-weight: 700;
}

.hero-model {
  position: relative;
  padding: 36px 0 20px 32px;
  border-left: 1px solid rgba(255, 255, 255, 0.28);
}

.model-label {
  margin: 0 0 26px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.hero-model ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-model li {
  min-height: 67px;
  display: grid;
  grid-template-columns: 42px 1fr;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-model li:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-model li span {
  color: var(--gold);
  font-size: 0.7rem;
}

.hero-model li strong {
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  font-weight: 600;
}

.hero-bottom {
  width: min(100%, var(--max-width));
  height: 62px;
  margin: 0 auto;
  padding: 0 var(--page-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: rgba(255, 255, 255, 0.48);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.hero-arc {
  position: absolute;
  z-index: -1;
  border: clamp(32px, 4vw, 64px) solid rgba(255, 255, 255, 0.055);
  border-radius: 50%;
}

.hero-arc-one {
  width: 36vw;
  height: 36vw;
  min-width: 420px;
  min-height: 420px;
  right: -11vw;
  top: -20vw;
}

.hero-arc-two {
  width: 18vw;
  height: 18vw;
  min-width: 260px;
  min-height: 260px;
  left: -8vw;
  bottom: -12vw;
  border-color: rgba(202, 163, 95, 0.08);
}

.proof-strip {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 var(--page-pad);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.proof-item {
  min-height: 126px;
  padding: 28px clamp(20px, 3vw, 44px);
  display: flex;
  align-items: center;
  gap: 18px;
  border-left: 1px solid var(--line);
}

.proof-item:last-child {
  border-right: 1px solid var(--line);
}

.proof-item span {
  color: var(--gold);
  font-size: 0.75rem;
  font-weight: 800;
}

.proof-item strong {
  font-size: clamp(0.95rem, 1.4vw, 1.18rem);
  line-height: 1.35;
}

.section {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: clamp(96px, 12vw, 180px) var(--page-pad);
}

.section-grid,
.experience-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.25fr);
  gap: clamp(60px, 10vw, 150px);
}

.hero-inner > *,
.section-grid > *,
.section-intro > *,
.execution-inner > *,
.experience-layout > *,
.company > * {
  min-width: 0;
}

.section h2,
.execution-section h2,
.contact h2 {
  font-size: clamp(2.7rem, 5vw, 5.6rem);
}

.section-body {
  max-width: 720px;
}

.about h2 {
  font-size: clamp(2.5rem, 3.7vw, 4.6rem);
}

.section-body > p {
  color: var(--muted);
}

.section-body .large-copy {
  margin: 0 0 32px;
  color: var(--ink);
  font-size: clamp(1.25rem, 2.2vw, 1.9rem);
  line-height: 1.55;
}

.not-list {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.not-list p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.not-list ul {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

.not-list li {
  padding: 7px 12px;
  background: var(--paper);
  color: #596471;
  font-size: 0.85rem;
}

.services {
  background: var(--paper);
}

.section-intro {
  margin-bottom: clamp(60px, 8vw, 110px);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(280px, 0.75fr);
  align-items: end;
  gap: clamp(50px, 9vw, 130px);
}

.section-intro > p {
  max-width: 550px;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.2rem);
}

.service-list {
  border-top: 1px solid #bfc6cc;
}

.service-item {
  min-height: 178px;
  padding: 32px 0;
  display: grid;
  grid-template-columns: 90px minmax(260px, 0.85fr) minmax(280px, 1.15fr);
  align-items: start;
  gap: 38px;
  border-bottom: 1px solid #bfc6cc;
}

.service-number {
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 800;
}

.service-title p,
.experience-list article > div > p {
  margin: 0 0 9px;
  color: #a97d36;
  font-size: 0.69rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.service-title h3,
.experience-list h3 {
  margin: 0;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  line-height: 1.3;
}

.service-description {
  max-width: 640px;
  margin: 2px 0 0;
  color: var(--muted);
}

.execution-section {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--navy-deep);
}

.execution-section::after {
  content: "A";
  position: absolute;
  left: -0.1em;
  bottom: -0.31em;
  color: rgba(255, 255, 255, 0.035);
  font-size: min(60vw, 760px);
  font-weight: 800;
  line-height: 1;
}

.execution-inner {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: clamp(100px, 12vw, 170px) var(--page-pad);
  display: grid;
  grid-template-columns: minmax(300px, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(70px, 10vw, 150px);
}

.execution-copy > p:last-child {
  max-width: 620px;
  margin: 36px 0 0;
  color: rgba(255, 255, 255, 0.7);
}

.execution-copy h2 {
  font-size: clamp(2.4rem, 3.8vw, 4.6rem);
}

.execution-pillars {
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.execution-pillars > div {
  padding: 30px 0;
  display: grid;
  grid-template-columns: 48px minmax(180px, 0.7fr) 1fr;
  align-items: start;
  gap: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}

.execution-pillars span {
  color: var(--gold);
  font-size: 0.72rem;
  font-weight: 800;
}

.execution-pillars h3 {
  margin: -3px 0 0;
  font-size: 1.08rem;
  line-height: 1.4;
}

.execution-pillars p {
  margin: 0;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.92rem;
}

.process-list {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.process-list li {
  min-height: 270px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.process-list span {
  display: block;
  margin-bottom: 64px;
  color: var(--gold);
  font-size: 0.76rem;
  font-weight: 800;
}

.process-list h3 {
  margin: 0 0 12px;
  font-size: 1.16rem;
  line-height: 1.35;
}

.process-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.experience {
  background: var(--paper);
}

.experience-heading {
  position: sticky;
  top: calc(var(--header-height) + 60px);
  align-self: start;
}

.experience-heading > p:last-child {
  max-width: 470px;
  margin-top: 34px;
  color: var(--muted);
  font-size: 0.88rem;
}

.experience-heading h2 {
  font-size: clamp(2.5rem, 4vw, 4.6rem);
}

.experience-list {
  border-top: 1px solid #bfc6cc;
}

.experience-list article {
  padding: 32px 0;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  border-bottom: 1px solid #bfc6cc;
}

.experience-list article > span {
  color: var(--gold);
  font-size: 0.76rem;
  font-weight: 800;
}

.experience-list article > div > p:last-child {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.company {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(0, 1.3fr);
  gap: clamp(60px, 10vw, 150px);
}

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

.company-details > div {
  min-height: 86px;
  padding: 22px 0;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 30px;
  border-bottom: 1px solid var(--line);
}

.company-details dt {
  color: var(--muted);
  font-size: 0.79rem;
  font-weight: 700;
}

.company h2 {
  font-size: clamp(2.45rem, 4.2vw, 4.8rem);
}

.company-details dd {
  margin: 0;
  font-size: 0.98rem;
}

.company-details a {
  color: var(--navy);
  border-bottom: 1px solid var(--navy);
}

.contact {
  position: relative;
  min-height: 610px;
  overflow: hidden;
  color: var(--white);
  background: var(--navy);
}

.contact-inner {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: clamp(100px, 12vw, 160px) var(--page-pad);
}

.contact h2 {
  max-width: 900px;
}

.contact-inner > p:not(.eyebrow) {
  max-width: 650px;
  margin: 34px 0 38px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.05rem;
}

.contact-mark {
  position: absolute;
  right: -0.12em;
  bottom: -0.32em;
  color: rgba(255, 255, 255, 0.045);
  font-size: min(66vw, 760px);
  font-weight: 800;
  line-height: 1;
}

.site-footer {
  width: min(100%, var(--max-width));
  min-height: 190px;
  margin: 0 auto;
  padding: 52px var(--page-pad);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 50px;
}

.footer-brand {
  width: 210px;
}

.footer-brand p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.73rem;
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 30px;
  color: var(--muted);
  font-size: 0.73rem;
}

.footer-meta p {
  margin: 0;
}

.footer-meta a {
  color: var(--ink);
}

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

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

@media (max-width: 1120px) {
  .primary-navigation {
    gap: 16px;
  }

  .primary-navigation > a:not(.nav-contact) {
    display: none;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
    gap: 60px;
  }

  .execution-pillars > div {
    grid-template-columns: 42px 1fr;
  }

  .execution-pillars p {
    grid-column: 2;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: 68px;
  }

  .brand {
    width: 138px;
  }

  .menu-button {
    height: 42px;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 0;
    background: transparent;
    color: var(--ink);
    font-size: 0.73rem;
    font-weight: 700;
    cursor: pointer;
  }

  .menu-icon {
    width: 26px;
    display: grid;
    gap: 6px;
  }

  .menu-icon span {
    width: 100%;
    height: 1px;
    display: block;
    background: var(--ink);
    transition: transform 200ms ease;
  }

  .menu-button[aria-expanded="true"] .menu-icon span:first-child {
    transform: translateY(3.5px) rotate(45deg);
  }

  .menu-button[aria-expanded="true"] .menu-icon span:last-child {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .primary-navigation {
    position: fixed;
    inset: var(--header-height) 0 auto;
    height: calc(100svh - var(--header-height));
    padding: 28px var(--page-pad) 40px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--white);
    visibility: hidden;
    clip-path: inset(0 0 0 100%);
    pointer-events: none;
    transition: clip-path 280ms ease, visibility 280ms step-end;
    overflow-y: auto;
  }

  .primary-navigation.is-open {
    visibility: visible;
    clip-path: inset(0 0 0 0);
    pointer-events: auto;
    transition: clip-path 280ms ease, visibility 0s step-start;
  }

  .primary-navigation > a:not(.nav-contact) {
    display: block;
  }

  .primary-navigation > a {
    padding: 17px 0;
    border-bottom: 1px solid var(--line);
    font-size: 1.08rem;
  }

  .primary-navigation > a::after {
    display: none;
  }

  .nav-contact {
    margin-top: 28px;
    padding: 14px 18px !important;
    text-align: center;
  }

  .language-switcher {
    margin-top: 28px;
    justify-content: center;
    gap: 12px;
  }

  .language-switcher button {
    padding: 10px 4px;
    font-size: 0.82rem;
  }

  .hero-inner,
  .section-grid,
  .section-intro,
  .experience-layout,
  .company,
  .execution-inner {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    min-height: auto;
    padding-top: 86px;
    gap: 76px;
  }

  .hero-model {
    max-width: 480px;
  }

  .proof-strip {
    grid-template-columns: 1fr;
  }

  .proof-item {
    min-height: 88px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .proof-item:last-child {
    border-bottom: 0;
  }

  .section-intro {
    align-items: start;
  }

  .service-item {
    grid-template-columns: 50px 1fr;
    gap: 18px;
  }

  .service-description {
    grid-column: 2;
  }

  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .experience-heading {
    position: static;
  }

  .site-footer {
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  :root {
    --page-pad: 22px;
  }

  .hero h1 {
    font-size: clamp(2.25rem, 9.8vw, 3.8rem);
  }

  html[lang="ja"] .hero h1,
  html[lang="zh-CN"] .hero h1 {
    font-size: clamp(2.25rem, 9.8vw, 3.8rem);
  }

  .hero-lead {
    margin-top: 28px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
  }

  .text-link {
    align-self: flex-start;
  }

  .hero-model {
    padding-left: 22px;
  }

  .hero-bottom {
    min-height: 70px;
    height: auto;
    padding-top: 12px;
    padding-bottom: 12px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 1px;
  }

  .section {
    padding-top: 92px;
    padding-bottom: 92px;
  }

  .section h2,
  .execution-section h2,
  .contact h2 {
    font-size: clamp(2.1rem, 9.5vw, 3.5rem);
  }

  .contact h2 {
    font-size: clamp(2.05rem, 8.5vw, 3.2rem);
  }

  .experience-heading h2,
  .company h2 {
    font-size: clamp(2.1rem, 9.5vw, 3.35rem);
  }

  .about h2 {
    font-size: clamp(2.05rem, 9.2vw, 3.1rem);
  }

  .execution-copy h2 {
    font-size: clamp(2rem, 8.8vw, 3rem);
  }

  .section-grid,
  .experience-layout {
    gap: 52px;
  }

  .service-item {
    padding: 27px 0;
    grid-template-columns: 40px 1fr;
  }

  .service-description {
    font-size: 0.9rem;
  }

  .execution-inner {
    padding-top: 90px;
    padding-bottom: 90px;
    gap: 64px;
  }

  .execution-pillars > div {
    grid-template-columns: 34px 1fr;
  }

  .process-list {
    grid-template-columns: 1fr;
  }

  .process-list li {
    min-height: 0;
    padding: 26px;
  }

  .process-list span {
    margin-bottom: 32px;
  }

  .company-details > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .contact {
    min-height: 580px;
  }

  .site-footer,
  .footer-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-footer {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .footer-meta {
    gap: 8px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}