:root {
  color-scheme: light;
  --ink: #252a32;
  --muted: #697582;
  --paper: #f6f8f9;
  --surface: #ffffff;
  --line: #d6dde3;
  --accent: #356f9b;
  --accent-dark: #252a32;
  --accent-soft: #e5eff6;
  --public: #386b4d;
  --public-bg: #e8f2eb;
  --case: #7a622a;
  --case-bg: #f6f0df;
  --private: #5d6670;
  --private-bg: #edf0f2;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI",
    "Noto Sans JP", "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--surface);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: none;
}

.project-hero {
  border-top: 4px solid var(--accent);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.hero-inner,
.shell,
footer {
  width: min(1040px, calc(100% - 2rem));
  margin-inline: auto;
}

.hero-inner {
  padding-block: clamp(0.85rem, 1.5vw, 1rem);
}

.hero-topline {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 760;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.eyebrow span {
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: #fafbfc;
}

.tier-badge {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin: 0 0 1rem;
  padding: 0.25rem 0.6rem;
  border-radius: 0.35rem;
  background: var(--private-bg);
  color: var(--private);
  font-size: 0.75rem;
  font-weight: 780;
}

.hero-topline .tier-badge {
  flex: 0 0 auto;
  margin: 0;
}

.tier-public_code .tier-badge {
  background: var(--public-bg);
  color: var(--public);
}

.tier-public_case_study .tier-badge {
  background: var(--case-bg);
  color: var(--case);
}

.project-hero h1 {
  max-width: 1040px;
  margin: 0;
  font-size: clamp(1.75rem, 3.2vw, 2.4rem);
  font-weight: 760;
  letter-spacing: -0.025em;
  line-height: 1.12;
}

.project-hero h1 span {
  display: block;
}

.project-hero h1 [lang="en"] {
  margin-top: 0.25rem;
  color: #4d5966;
  font-size: 0.52em;
  font-weight: 580;
  letter-spacing: -0.01em;
}

.copy-pair p {
  margin: 0;
}

.copy-pair .translation {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9em;
}

.hero-summary {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(21rem, 0.85fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
  margin-top: 0.85rem;
}

.project-hero .lede {
  max-width: 680px;
  font-size: clamp(0.92rem, 1.35vw, 1rem);
  line-height: 1.58;
}

.hero-facts {
  padding-left: 1.1rem;
  border-left: 1px solid var(--line);
}

.project-meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 6.5rem;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--line);
  gap: 1px;
}

.project-meta div {
  padding: 0.45rem 0.55rem;
  background: #fafbfc;
}

.project-meta dt {
  color: var(--muted);
  font-size: 0.6rem;
  font-weight: 780;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.project-meta dd {
  margin: 0.08rem 0 0;
  font-size: 0.85rem;
  font-weight: 680;
  line-height: 1.28;
}

.project-meta dd span {
  display: block;
}

.project-meta dd [lang="en"] {
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 500;
}

.method-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.6rem;
  font-weight: 780;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.method-block {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  align-items: start;
  margin-top: 0.65rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line);
}

.method-list {
  display: block;
  margin: 0;
  padding: 0;
  list-style: none;
  line-height: 1.45;
}

.method-list li {
  display: inline;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.68rem;
}

.method-list li + li::before {
  color: var(--muted);
  content: " / ";
}

.shell {
  padding-block: clamp(2.75rem, 6vw, 5rem);
}

.shell section + section {
  margin-top: clamp(3.5rem, 7vw, 6rem);
}

.section-heading {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.7rem;
  align-items: baseline;
  margin-bottom: 1.35rem;
}

.section-heading > p {
  margin: 0;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 800;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  font-weight: 740;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.section-heading h2 [lang="en"] {
  display: block;
  margin-top: 0.1rem;
  color: var(--muted);
  font-size: 0.52em;
  font-weight: 580;
  letter-spacing: 0;
}

.evidence-figure figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--surface);
}

.evidence-figure img {
  display: block;
  width: 100%;
  max-height: 32rem;
  padding: clamp(0.65rem, 2.5vw, 1.25rem);
  object-fit: contain;
  background: #fff;
}

.evidence-figure figcaption {
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
}

.evidence-figure figcaption span {
  display: block;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.highlight {
  position: relative;
  min-height: 11rem;
  padding: 3.1rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--surface);
}

.highlight-number {
  position: absolute;
  top: 0.9rem;
  left: 1.15rem;
  display: grid;
  width: 1.65rem;
  height: 1.65rem;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-card {
  position: relative;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 0.35rem;
  background: var(--surface);
}

.flow-card::before {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--accent);
  content: attr(data-step);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 800;
}

.flow-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.flow-card h3 span {
  display: block;
}

.flow-card h3 [lang="en"] {
  color: var(--muted);
  font-size: 0.72em;
  font-weight: 580;
}

.limitations > ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.limitations > ul > li {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: var(--surface);
}

.limitations > ul > li + li {
  margin-top: 0.65rem;
}

.publication-panel {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--surface);
}

.publication-panel .tier-badge {
  margin-bottom: 0.75rem;
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 0.8rem;
}

.cta {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  min-height: 4.6rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 0.45rem;
  background: var(--surface);
  color: var(--accent-dark);
  text-decoration: none;
  transition: border-color 150ms ease, background 150ms ease;
}

.cta:hover,
.cta:focus-visible {
  border-color: var(--accent-dark);
  background: var(--accent-soft);
}

.cta strong,
.cta > span[lang="en"] {
  display: block;
  grid-column: 1;
}

.cta > span[lang="en"] {
  color: var(--muted);
  font-size: 0.76rem;
}

.cta > span[aria-hidden="true"] {
  grid-column: 2;
  grid-row: 1 / 3;
  color: var(--accent);
  font-size: 1.1rem;
}

.cta.is-disabled {
  border-color: var(--line);
  background: #f0f2f4;
  color: var(--muted);
  cursor: not-allowed;
}

.cta small {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
  font-size: 0.63rem;
  line-height: 1.35;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
}

footer p {
  margin: 0;
}

@media (max-width: 820px) {
  .highlight-grid,
  .flow-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .hero-topline {
    flex-wrap: wrap;
    margin-bottom: 0.6rem;
  }

  .project-hero h1 {
    font-size: clamp(1.55rem, 7.3vw, 1.95rem);
    line-height: 1.14;
  }

  .hero-summary {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-top: 0.7rem;
  }

  .project-hero .lede {
    max-width: none;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .copy-pair .translation {
    font-size: 0.82em;
  }

  .hero-facts {
    padding-top: 0.75rem;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .method-block {
    grid-template-columns: 1fr;
    gap: 0.2rem;
    margin-top: 0.6rem;
    padding-top: 0.5rem;
  }
}

@media (max-width: 560px) {
  .hero-inner,
  .shell,
  footer {
    width: min(100% - 1.25rem, 1040px);
  }

  .hero-inner {
    padding-block: 0.9rem 1.15rem;
  }

  .highlight-grid,
  .flow-grid,
  .cta-grid {
    grid-template-columns: 1fr;
  }

  .project-meta {
    grid-template-columns: minmax(0, 1fr) 5.75rem;
  }

  .section-heading {
    grid-template-columns: 1.8rem 1fr;
  }
}

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

  .cta {
    transition: none;
  }
}

@media print {
  body {
    background: #fff;
  }

  .highlight,
  .flow-card,
  .publication-panel,
  .project-meta {
    break-inside: avoid;
  }

  .cta[href]::after {
    grid-column: 1 / -1;
    content: " " attr(href);
    font-size: 0.55rem;
  }
}