:root {
  --paper: #f5fbfc;
  --white: #ffffff;
  --ink: #0a3142;
  --ink-2: #173f4f;
  --teal: #0e8b8f;
  --teal-deep: #087176;
  --mist: #dcebed;
  --line: rgba(10, 49, 66, .16);
  --muted: #647d87;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; }

.site-header {
  position: absolute;
  z-index: 20;
  inset: 0 0 auto;
  height: 78px;
  padding: 0 max(28px, calc((100vw - var(--max)) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(10,49,66,.12);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font: 700 20px/1 "DM Sans", sans-serif; letter-spacing: -.04em; }
.brand img { width: 29px; height: 31px; object-fit: contain; }
.site-header nav { display: flex; align-items: center; gap: 30px; }
.site-header nav a { font: 600 10px/1 "DM Sans", sans-serif; letter-spacing: .13em; }
.header-contact { padding: 12px 17px; border: 1px solid rgba(10,49,66,.3); }

.hero {
  position: relative;
  height: min(880px, 100svh);
  min-height: 700px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  position: absolute;
  inset: 78px 0 0;
  background:
    linear-gradient(90deg, transparent 0 calc(50% - 1px), rgba(10,49,66,.05) calc(50% - 1px) 50%, transparent 50%),
    repeating-linear-gradient(90deg, transparent 0 calc(8.333% - 1px), rgba(10,49,66,.045) calc(8.333% - 1px) 8.333%);
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}
#signal {
  position: absolute;
  z-index: 1;
  inset: 78px 0 0;
  width: 100%;
  height: calc(100% - 78px);
  pointer-events: none;
  opacity: .9;
}
.hero-content {
  position: relative;
  z-index: 3;
  max-width: var(--max);
  height: 100%;
  margin: auto;
  padding: 142px 0 74px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.overline, .section-label {
  margin: 0;
  color: var(--teal);
  font: 600 10px/1.3 "Roboto Mono", monospace;
  letter-spacing: .14em;
}
.hero h1 {
  margin: auto 0;
  width: min-content;
  font: 600 clamp(72px, 9.2vw, 134px)/.78 "DM Sans", sans-serif;
  letter-spacing: -.085em;
}
.hero h1 span { display: block; }
.hero h1 span:last-child { color: var(--teal); margin-left: .58em; }
.hero-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.hero-ja { margin: 0; font-size: clamp(20px, 2vw, 28px); font-weight: 500; letter-spacing: .04em; }
.hero-description { max-width: 560px; margin: 0; color: var(--ink-2); font-size: 14px; line-height: 2; }
.actions { margin-top: 25px; display: flex; align-items: center; gap: 30px; }
.button {
  display: inline-flex;
  min-height: 48px;
  padding: 0 22px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  font-size: 13px;
  font-weight: 600;
}
.primary { color: var(--paper); background: var(--ink); }
.text-link { font-size: 13px; font-weight: 600; }
.text-link span { margin-left: 10px; color: var(--teal); }
.hero-index { position: absolute; right: 28px; bottom: 72px; margin: 0; color: var(--muted); font: 500 8px/1.7 "Roboto Mono", monospace; letter-spacing: .12em; }

.section-shell { width: min(calc(100% - 88px), var(--max)); margin-inline: auto; }
.intro { padding: 130px 0 120px; display: grid; grid-template-columns: 180px 1fr; gap: 20px; }
.intro-main { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; }
.intro-main h2, .method-heading h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.38;
  letter-spacing: -.04em;
  font-weight: 500;
}
.intro-main > p, .method-heading > p { margin: 8px 0 0; color: var(--ink-2); font-size: 14px; line-height: 2.05; }
.scope-list { grid-column: 2; margin: 84px 0 0; border-top: 1px solid var(--line); }
.scope-list div { display: grid; grid-template-columns: 72px 1fr; border-bottom: 1px solid var(--line); padding: 24px 0; }
.scope-list dt { color: var(--teal); font: 500 10px/1 "Roboto Mono", monospace; }
.scope-list dd { margin: 0; display: flex; justify-content: space-between; gap: 20px; }
.scope-list b { font-size: 18px; font-weight: 500; }
.scope-list span { color: var(--muted); font-size: 12px; }

.ai-system { color: var(--paper); background: var(--ink); padding: 118px 0 110px; }
.light { color: #64c3c3; }
.system-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: end; }
.system-heading h2 { margin: 24px 0 0; font-size: clamp(44px, 5.5vw, 72px); font-weight: 500; letter-spacing: -.055em; }
.system-heading > p { max-width: 540px; margin: 0; color: #c1d1d6; font-size: 14px; line-height: 2; }
.system-rail { margin-top: 90px; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.23); }
.rail-step {
  position: relative;
  border: 0;
  border-right: 1px solid rgba(255,255,255,.17);
  padding: 27px 22px 31px 0;
  text-align: left;
  background: transparent;
  cursor: pointer;
}
.rail-step:last-child { border-right: 0; }
.rail-step::before { content: ""; position: absolute; top: -2px; left: 0; height: 3px; width: 0; background: #64c3c3; transition: width .35s ease; }
.rail-step.is-active::before, .rail-step:hover::before { width: calc(100% - 22px); }
.rail-step span { display: block; color: #64c3c3; font: 500 9px/1 "Roboto Mono", monospace; letter-spacing: .12em; }
.rail-step b { display: block; margin-top: 17px; font-size: 17px; font-weight: 500; }
.rail-step small { display: block; margin-top: 7px; color: #9db1ba; font-size: 11px; }
.rail-caption { min-height: 26px; margin: 17px 0 0; color: #b8cacd; font-size: 12px; }
.possible { margin-top: 92px; }
.possible-list { margin-top: 28px; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid rgba(255,255,255,.18); }
.possible-list span { padding: 17px 0; border-bottom: 1px solid rgba(255,255,255,.18); color: #e4edef; font-size: 13px; }
.possible-list span:nth-child(odd) { padding-right: 50px; border-right: 1px solid rgba(255,255,255,.18); }
.possible-list span:nth-child(even) { padding-left: 50px; }
.service-jump { margin-top: 72px; padding: 31px 0; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid rgba(255,255,255,.35); border-bottom: 1px solid rgba(255,255,255,.35); }
.service-jump p { margin: 0; display: flex; align-items: baseline; gap: 26px; }
.service-jump b { font-size: 24px; font-weight: 500; }
.service-jump p span { color: #aebfc4; font-size: 12px; }
.service-jump a { color: #64c3c3; font-size: 13px; font-weight: 600; }

.method { padding: 125px 0 135px; }
.method-heading { margin-top: 36px; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; }
.method-list { margin: 80px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.method-list li { display: grid; grid-template-columns: 70px .75fr 1.25fr; gap: 30px; padding: 28px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.method-list li > span { color: var(--teal); font: 500 10px/1 "Roboto Mono", monospace; }
.method-list b { font-size: 17px; font-weight: 500; }
.method-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

.company { padding: 120px 0; background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.company-grid { display: grid; grid-template-columns: .9fr 1.35fr; gap: 120px; align-items: start; }
.company h2 { margin: 24px 0 0; font: 600 46px/1.1 "DM Sans", "Noto Sans JP", sans-serif; letter-spacing: -.05em; }
.company-description { margin: 28px 0 0; max-width: 250px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.company-data { margin: 0; }
.company-data div { display: grid; grid-template-columns: 78px 1fr; gap: 18px; padding: 0 0 20px; margin-bottom: 20px; border-bottom: 1px solid var(--line); }
.company-data dt { color: var(--muted); font-size: 11px; }
.company-data dd { margin: 0; font-size: 13px; line-height: 1.8; }
.company-data small { color: var(--muted); font-size: 10px; }
.contact-band { padding: 110px 0; color: var(--paper); background: var(--teal-deep); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; }
.contact-grid h2 { margin: 26px 0 0; font-size: clamp(36px, 4vw, 52px); line-height: 1.3; font-weight: 500; letter-spacing: -.04em; }
.contact-grid > div > p:not(.section-label) { max-width: 500px; margin: 24px 0 30px; color: #d4e7e7; font-size: 13px; line-height: 1.9; }
.reverse { border-color: var(--paper); color: var(--ink); background: var(--paper); }
.download-panel { padding: 34px 38px; border: 1px solid rgba(255,255,255,.3); }
.download-panel h3 { margin: 28px 0 0; font-size: 24px; font-weight: 500; }
.download-panel a { display: flex; justify-content: space-between; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.24); font-size: 13px; font-weight: 600; }

footer {
  padding: 55px max(28px, calc((100vw - var(--max)) / 2)) 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  align-items: start;
}
footer p { margin: 25px 0 40px; color: var(--muted); font-size: 11px; line-height: 1.8; }
footer nav { justify-self: end; display: flex; gap: 24px; font: 600 9px/1 "DM Sans", sans-serif; letter-spacing: .12em; }
footer small { color: var(--muted); font: 500 9px/1 "Roboto Mono", monospace; }

.subpage-hero {
  padding: 166px 0 88px;
  border-bottom: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, transparent 0 calc(8.333% - 1px), rgba(10,49,66,.04) calc(8.333% - 1px) 8.333%);
}
.subpage-hero-grid {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 80px;
  align-items: end;
}
.subpage-hero h1 {
  margin: 28px 0 0;
  font: 600 clamp(62px, 8vw, 104px)/.85 "DM Sans", sans-serif;
  letter-spacing: -.075em;
}
.subpage-hero h1 span { color: var(--teal); }
.subpage-intro { max-width: 520px; margin: 0; color: var(--ink-2); font-size: 14px; line-height: 2; }

.journal { padding: 34px 0 120px; }
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 0 28px;
  border-bottom: 1px solid var(--line);
}
.filter {
  padding: 9px 13px;
  border: 1px solid transparent;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: 11px;
}
.filter[aria-selected="true"] { border-color: var(--ink); color: var(--paper); background: var(--ink); }
.journal-list { border-top: 1px solid var(--line); }
.journal-row {
  display: grid;
  grid-template-columns: 120px 120px 1fr 26px;
  gap: 24px;
  align-items: center;
  min-height: 118px;
  border-bottom: 1px solid var(--line);
  transition: padding .3s ease, background .3s ease;
}
.journal-row:hover { padding-inline: 16px; background: rgba(255,255,255,.55); }
.journal-date, .journal-category { color: var(--muted); font: 500 10px/1.5 "Roboto Mono", monospace; }
.journal-category { color: var(--teal); }
.journal-title { font-size: 16px; font-weight: 500; line-height: 1.7; }
.journal-arrow { color: var(--teal); }

.contact-section { padding: 104px 0 125px; }
.contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; align-items: start; }
.contact-note h2 { margin: 28px 0 0; font-size: clamp(29px, 2.8vw, 36px); line-height: 1.45; font-weight: 500; letter-spacing: -.04em; }
.contact-note > p:not(.section-label) { max-width: 430px; margin: 24px 0 0; color: var(--muted); font-size: 13px; line-height: 2; }
.contact-email { display: inline-block; margin-top: 34px; padding-bottom: 5px; border-bottom: 1px solid var(--teal); color: var(--teal); font: 600 13px/1.4 "DM Sans", sans-serif; }
.contact-company { margin-top: 64px; padding-top: 25px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; line-height: 2; }
.contact-form { display: grid; gap: 28px; }
.field { display: grid; gap: 9px; }
.field > span { color: var(--muted); font-size: 11px; }
.field em { margin-left: 7px; color: var(--teal); font-size: 9px; font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(10,49,66,.32);
  border-radius: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font: 400 15px/1.7 "Noto Sans JP", sans-serif;
}
.field input, .field select { height: 52px; }
.field textarea { min-height: 170px; padding: 14px 0; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--teal); }
.form-note { margin: -7px 0 0; color: var(--muted); font-size: 10px; line-height: 1.8; }
.submit-row { display: flex; align-items: center; gap: 20px; }
.submit-row .button { cursor: pointer; }

.grid-bg { display: none !important; }
body:has(.article-page) header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
body:has(.article-page) .hdr-wrap {
  width: min(calc(100% - 88px), var(--max));
  height: 78px;
  margin-inline: auto;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
body:has(.article-page) .logo-link { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
body:has(.article-page) .logo-link img { width: 29px; height: 31px; object-fit: contain; }
body:has(.article-page) .logo-link span { font: 700 20px/1 "DM Sans", sans-serif; letter-spacing: -.04em; }
body:has(.article-page) .main-nav { display: flex; align-items: center; gap: 30px; }
body:has(.article-page) .nav-link,
body:has(.article-page) .nav-contact {
  padding: 8px 0;
  border: 0;
  border-radius: 0;
  color: var(--ink);
  background: transparent;
  font: 600 10px/1 "DM Sans", sans-serif;
  letter-spacing: .13em;
}
body:has(.article-page) .nav-contact { padding: 12px 17px; border: 1px solid rgba(10,49,66,.3); }
.article-shell { width: min(calc(100% - 48px), 760px); margin-inline: auto; }
.breadcrumb { max-width: 760px; margin-inline: auto; padding: 46px 0 0; color: var(--muted); font-size: 10px; }
.article-head { max-width: 760px; margin-inline: auto; padding: 64px 0 54px; border-bottom: 1px solid var(--line); }
.article-meta { display: flex; gap: 20px; color: var(--muted); font: 500 10px/1.5 "Roboto Mono", monospace; }
.article-meta .article-cat { color: var(--teal); }
.article-title { margin: 24px 0 0; font-size: clamp(32px, 5vw, 50px); line-height: 1.42; font-weight: 500; letter-spacing: -.045em; }
.article-title-rule { display: none; }
.article-body { max-width: 760px; margin-inline: auto; padding: 52px 0 20px; }
.article-body h2 { margin: 54px 0 17px; font-size: 23px; line-height: 1.6; font-weight: 500; letter-spacing: -.025em; }
.article-body p, .article-body li { color: var(--ink-2); font-size: 15px; line-height: 2.1; }
.article-body p { margin: 0 0 23px; }
.article-body ul { margin: 0 0 24px; padding-left: 1.4em; }
.article-cta, .cta-box { max-width: 760px; margin: 58px auto 0; padding: 34px; border-radius: 0; color: var(--paper); background: var(--ink); text-align: left; }
.article-cta p, .cta-box p { margin: 0 0 22px; color: #d4e1e4; font-size: 13px; line-height: 1.9; }
.article-cta a, .cta-box .btn-light { display: inline-flex; min-height: 44px; padding: 0 18px; border-radius: 0; align-items: center; color: var(--ink); background: var(--paper); font-size: 12px; font-weight: 600; }
.ai-disclosure { max-width: 760px; margin: 38px auto 90px; padding: 20px 0 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; line-height: 1.8; }

@media (max-width: 900px) {
  .hero-content { padding-inline: 38px; }
  .hero-bottom, .intro-main, .system-heading, .method-heading, .company-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: clamp(68px, 12vw, 105px); }
  .hero-bottom { gap: 18px; }
  .intro { grid-template-columns: 120px 1fr; }
  .scope-list { grid-column: 2; }
  .company-grid { gap: 50px; }
  .company-description { max-width: 500px; }
  .map-wrap { aspect-ratio: 2; }
  .subpage-hero-grid, .contact-layout { grid-template-columns: 1fr; }
  .subpage-hero-grid { gap: 38px; }
  .contact-layout { gap: 70px; }
}

@media (max-width: 640px) {
  .site-header { height: 66px; padding: 0 20px; }
  .site-header nav a:not(.header-contact) { display: none; }
  .header-contact { padding: 10px 13px; }
  .brand { font-size: 18px; }
  .brand img { width: 25px; height: 27px; }
  .hero { min-height: 690px; height: 100svh; }
  .hero-grid { inset: 66px 0 0; }
  #signal { inset: 66px 0 0; height: calc(100% - 66px); opacity: .62; }
  .hero-content { padding: 112px 22px 40px; }
  .overline { max-width: 250px; line-height: 1.7; }
  .hero h1 { margin: auto 0 70px; font-size: clamp(55px, 18vw, 75px); line-height: .83; }
  .hero h1 span:last-child { margin-left: 0; }
  .hero-bottom { gap: 16px; }
  .hero-ja { font-size: 19px; }
  .hero-description { font-size: 12px; line-height: 1.85; }
  .actions { margin-top: 18px; gap: 18px; align-items: flex-start; flex-direction: column; }
  .button { min-height: 44px; padding: 0 17px; font-size: 12px; }
  .hero-index { display: none; }
  .section-shell { width: min(calc(100% - 44px), var(--max)); }
  .intro { padding: 84px 0; display: block; }
  .intro-main { margin-top: 26px; gap: 28px; }
  .intro-main h2, .method-heading h2 { font-size: 31px; }
  .intro-main > p { font-size: 13px; }
  .scope-list { margin-top: 52px; }
  .scope-list div { grid-template-columns: 48px 1fr; }
  .scope-list dd { display: block; }
  .scope-list b { display: block; font-size: 16px; }
  .scope-list span { display: block; margin-top: 7px; }
  .ai-system { padding: 82px 0 78px; }
  .system-heading { gap: 26px; }
  .system-heading h2 { margin-top: 18px; font-size: 38px; }
  .system-heading > p { font-size: 12px; }
  .system-rail { margin-top: 58px; grid-template-columns: 1fr 1fr; }
  .rail-step { min-height: 130px; border-bottom: 1px solid rgba(255,255,255,.17); padding: 21px 15px 21px 0; }
  .rail-step:nth-child(2) { border-right: 0; padding-left: 14px; }
  .rail-step:nth-child(4) { border-right: 0; padding-left: 14px; }
  .rail-step b { font-size: 14px; }
  .rail-step small { font-size: 9px; }
  .possible { margin-top: 65px; }
  .possible-list { grid-template-columns: 1fr; }
  .possible-list span:nth-child(n) { padding: 14px 0; border-right: 0; font-size: 12px; }
  .service-jump { align-items: flex-start; gap: 28px; flex-direction: column; }
  .service-jump p { display: block; }
  .service-jump p span { display: block; margin-top: 10px; line-height: 1.7; }
  .method { padding: 84px 0 90px; }
  .method-heading { margin-top: 27px; gap: 26px; }
  .method-list { margin-top: 55px; }
  .method-list li { grid-template-columns: 42px 1fr; gap: 12px; padding: 22px 0; }
  .method-list p { grid-column: 2; }
  .company { padding: 80px 0; }
  .company h2 { font-size: 38px; }
  .company-data div { grid-template-columns: 65px 1fr; }
  .map-wrap { aspect-ratio: 1.15; }
  .contact-band { padding: 78px 0; }
  .contact-grid { gap: 56px; }
  .contact-grid h2 { font-size: 34px; }
  .download-panel { padding: 27px 24px; }
  footer { display: block; padding: 48px 22px 28px; }
  footer nav { justify-self: auto; flex-wrap: wrap; }
  .subpage-hero { padding: 118px 0 65px; }
  .subpage-hero h1 { font-size: 58px; }
  .subpage-intro { font-size: 12px; }
  .journal { padding: 22px 0 82px; }
  .journal-row { grid-template-columns: 1fr 90px; gap: 7px 14px; padding: 22px 0; }
  .journal-row:hover { padding-inline: 0; }
  .journal-date { grid-column: 1; }
  .journal-category { grid-column: 2; grid-row: 1; text-align: right; }
  .journal-title { grid-column: 1 / -1; font-size: 14px; }
  .journal-arrow { display: none; }
  .contact-section { padding: 78px 0 90px; }
  .contact-note h2 { font-size: 27px; }
  .contact-company { margin-top: 42px; }
  .submit-row .button { width: 100%; }
  .article-shell { width: min(calc(100% - 38px), 760px); }
  body:has(.article-page) .hdr-wrap { width: min(calc(100% - 38px), var(--max)); height: 66px; }
  body:has(.article-page) .main-nav .nav-link:not(.is-current) { display: none; }
  body:has(.article-page) .logo-link span { font-size: 18px; }
  .breadcrumb, .article-head, .article-body, .cta-box, .ai-disclosure { width: min(calc(100% - 38px), 760px); }
  .breadcrumb { padding-top: 32px; }
  .article-head { padding: 44px 0 38px; }
  .article-title { font-size: 30px; }
  .article-body { padding-top: 38px; }
  .article-body h2 { margin-top: 43px; font-size: 20px; }
  .article-body p, .article-body li { font-size: 14px; line-height: 2; }
  .article-cta { padding: 26px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .process-line { animation: none; }
}