:root {
  --blue: #2e6fb3;
  --yellow: #edbd01;
  --green: #61bc6d;
  --red: #c9422e;
  --white: #ffffff;
  --black: #000000;
  --page-padding: clamp(1.25rem, 4vw, 4rem);
  --content-width: 74rem;
  --line: 1px solid var(--black);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 20rem;
  margin: 0;
  background: var(--white);
  color: var(--black);
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--blue); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; }

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-weight: 700; line-height: 1.15; letter-spacing: -0.045em; }

.site-shell { width: min(100% - (var(--page-padding) * 2), var(--content-width)); margin-inline: auto; }

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  padding: 0.5rem 0.75rem;
  background: var(--yellow);
  color: var(--black);
  transform: translateY(-200%);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header { border-bottom: var(--line); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.5rem;
  gap: 1.5rem;
}

.wordmark {
  flex: 0 0 auto;
  color: var(--black);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.07em;
  text-decoration: none;
}

.wordmark:hover { color: var(--black); }
.wordmark span { color: var(--blue); }

.site-nav { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.5rem); }
.site-nav a { font-size: 0.875rem; font-weight: 650; text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--blue); }

.menu-toggle {
  display: none;
  padding: 0;
  border: 0;
  background: none;
  color: var(--black);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
}

.section-space { padding-block: clamp(4.5rem, 9vw, 8.5rem); }
.section-bordered { border-top: var(--line); }

.intro { padding-top: clamp(4.5rem, 9vw, 8rem); }

.intro-grid {
  display: grid;
  grid-template-columns: minmax(9rem, 0.6fr) minmax(0, 1.55fr) minmax(9rem, 0.55fr);
  gap: 2rem;
  align-items: start;
}

.eyebrow {
  display: flex;
  gap: 0.8rem;
  align-items: baseline;
  margin-bottom: 1rem;
  color: var(--blue);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.eyebrow span { color: var(--black); font-variant-numeric: tabular-nums; }

.intro h1 { max-width: 13ch; margin-bottom: 1.5rem; font-size: clamp(2.8rem, 7vw, 6rem); }

.lead { max-width: 39rem; margin-bottom: 1.75rem; font-size: clamp(1rem, 1.7vw, 1.18rem); line-height: 1.9; }

.intro-note { padding-top: 0.35rem; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; line-height: 1.4; text-transform: uppercase; }
.intro-note p { margin-bottom: 0.5rem; }
.intro-note p:last-child { color: var(--green); }

.color-rule { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; height: 0.4rem; margin-top: clamp(3.5rem, 8vw, 7rem); }
.color-rule span:nth-child(1), .project-mark span:nth-child(1) { background: var(--blue); }
.color-rule span:nth-child(2), .project-mark span:nth-child(2) { background: var(--yellow); }
.color-rule span:nth-child(3), .project-mark span:nth-child(3) { background: var(--green); }
.color-rule span:nth-child(4), .project-mark span:nth-child(4) { background: var(--red); }

.section-heading { max-width: 39rem; }
.section-heading h2, .contact-band h2 { margin-bottom: 0; font-size: clamp(2rem, 4vw, 3.8rem); }

.project-list { border-top: var(--line); }
.project-list-featured { margin-top: clamp(2.5rem, 6vw, 5rem); }

.project-entry {
  position: relative;
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: start;
  min-height: 18rem;
  padding: clamp(2rem, 4vw, 3.25rem) 0;
  border-bottom: var(--line);
}

.project-number { color: var(--blue); font-size: 0.75rem; font-weight: 750; letter-spacing: 0.08em; }
.project-category { margin-bottom: 0.6rem; color: var(--blue); font-size: 0.75rem; font-weight: 750; letter-spacing: 0.08em; text-transform: uppercase; }
.project-main h3 { margin-bottom: 1rem; font-size: clamp(2rem, 4vw, 3.75rem); }
.project-main > p:last-child { max-width: 43rem; margin-bottom: 0; }
.project-action { align-self: end; margin-bottom: 0.25rem; }

.project-mark { position: absolute; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(4, 1fr); width: 7rem; height: 0.38rem; }

.button-link {
  display: inline-flex;
  gap: 0.7rem;
  align-items: center;
  padding: 0.7rem 1rem;
  border: var(--line);
  background: var(--white);
  color: var(--black);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 130ms ease, color 130ms ease;
}

.button-link:hover { background: var(--blue); color: var(--white); }
.text-link { display: inline-flex; gap: 0.5rem; align-items: center; color: var(--blue); font-size: 0.875rem; font-weight: 750; text-decoration: none; }
.text-link:hover { color: var(--red); }
.text-link span { font-size: 1.1em; }
.section-footer-link { margin: 2.25rem 0 0; }

.split-section { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr); gap: clamp(3rem, 10vw, 11rem); }
.body-copy { padding-top: 0.15rem; }
.body-copy p { max-width: 39rem; margin-bottom: 1.5rem; }
.body-copy p:last-of-type { margin-bottom: 2rem; }

.contact-band { border-top: var(--line); border-bottom: var(--line); background: var(--blue); color: var(--white); }
.contact-band-inner { display: flex; align-items: end; justify-content: space-between; gap: 2rem; padding-block: clamp(2.5rem, 5vw, 4rem); }
.contact-band .eyebrow { color: var(--white); }
.contact-band .eyebrow span { color: var(--yellow); }
.button-link-light { border-color: var(--white); background: var(--blue); color: var(--white); }
.button-link-light:hover { background: var(--white); color: var(--blue); }

.site-footer { padding-block: 1.4rem; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-inner p { margin: 0; font-size: 0.7rem; font-weight: 650; }

.page-intro { padding-block: clamp(4.5rem, 9vw, 8.5rem); }
.page-intro h1 { margin-bottom: 1.5rem; font-size: clamp(3rem, 7vw, 6rem); }
.page-intro .lead { margin-bottom: 0; }
.page-intro-about { padding-bottom: clamp(4.5rem, 9vw, 8.5rem); }
.projects-section { padding-block: 0; }
.projects-section .project-entry { min-height: 21rem; }
.next-step { background: var(--yellow); }
.next-step .eyebrow { color: var(--black); }

.definition-list { margin: clamp(2.5rem, 6vw, 5rem) 0 0; border-top: var(--line); }
.definition-list > div { display: grid; grid-template-columns: minmax(12rem, 0.65fr) minmax(0, 1fr); gap: 2rem; padding-block: 1.5rem; border-bottom: var(--line); }
.definition-list dt { color: var(--blue); font-size: 0.82rem; font-weight: 750; letter-spacing: 0.05em; }
.definition-list dd { margin: 0; }

.contact-intro { background: var(--green); }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr); gap: clamp(3rem, 10vw, 11rem); }
.contact-placeholder { padding: 1.6rem; border-left: 0.45rem solid var(--yellow); background: var(--black); color: var(--white); }
.contact-placeholder p { margin-bottom: 0.75rem; font-weight: 700; }
.contact-placeholder .small-text { margin-bottom: 0; color: var(--white); font-size: 0.875rem; font-weight: 500; }

@media (max-width: 48rem) {
  .intro-grid { grid-template-columns: 1fr; gap: 2rem; }
  .intro .eyebrow { order: 0; }
  .intro-copy { order: 1; }
  .intro-note { order: 2; display: flex; gap: 1.25rem; padding-top: 0; }
  .intro-note p { margin: 0; }
  .project-entry { grid-template-columns: 3rem minmax(0, 1fr); min-height: 0; gap: 1rem; }
  .project-action { grid-column: 2; align-self: start; margin-top: 0.5rem; }
  .split-section, .contact-layout { grid-template-columns: 1fr; gap: 2.25rem; }
  .definition-list > div { grid-template-columns: 1fr; gap: 0.6rem; }
}

@media (max-width: 38rem) {
  body.menu-open { overflow: hidden; }
  .header-inner { position: relative; min-height: 4rem; }
  .menu-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; z-index: 10; top: 100%; right: 0; left: 0; padding: 1.2rem var(--page-padding) 1.5rem; border-bottom: var(--line); background: var(--white); }
  .site-nav.is-open { display: grid; gap: 0.35rem; }
  .site-nav a { display: block; padding-block: 0.6rem; font-size: 1rem; }
  .intro h1 { font-size: clamp(2.6rem, 14vw, 4.25rem); }
  .contact-band-inner { display: grid; align-items: start; }
  .project-entry { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .project-main h3 { font-size: 2rem; }
  .project-mark { width: 4.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}