:root {
  --color-bg: #fbfcff;
  --color-surface: #ffffff;
  --color-text: #142033;
  --color-muted: #5c6675;
  --color-border: #dbe5f1;
  --color-accent: #0176d3;
  --color-accent-dark: #014486;
  --color-soft: #eef6ff;
  --shadow-sm: none;
  --radius: 8px;
  --container: 800px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(1, 118, 211, 0.28);
  outline-offset: 3px;
}

p,
h1,
h2,
h3 {
  margin-top: 0;
}

p {
  color: var(--color-muted);
}

h1,
h2,
h3 {
  color: var(--color-text);
  font-weight: 720;
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 1rem;
  font-size: clamp(2.6rem, 7vw, 4.2rem);
}

.page h1 {
  font-size: clamp(2.15rem, 5vw, 3.25rem);
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(219, 229, 241, 0.85);
  background: rgba(251, 252, 255, 0.92);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 760;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.nav-links a {
  transition: color 160ms ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--color-text);
}

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

.section,
.section-lg,
.page {
  padding-block: 4rem;
}

.section + .section {
  padding-top: 0.5rem;
}

.intro {
  padding-top: 6rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--color-border);
}

.eyebrow,
.project-meta {
  margin-bottom: 0.8rem;
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-copy,
.lead {
  max-width: 660px;
  font-size: 1.16rem;
}

.intro-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1rem;
  margin: 1.75rem 0 0;
  padding: 0;
  color: var(--color-muted);
  list-style: none;
}

.intro-meta li {
  position: relative;
  padding-left: 0.85rem;
}

.intro-meta li::before {
  position: absolute;
  left: 0;
  content: "/";
  color: #9baabd;
}

.quiet-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-weight: 680;
  line-height: 1.2;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--color-accent);
  color: #ffffff;
}

.button-primary:hover {
  background: var(--color-accent-dark);
}

.button-secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

.button-secondary:hover {
  border-color: #b8cbe1;
  background: #f7fbff;
}

.button-ghost {
  color: var(--color-accent);
}

.button-ghost:hover {
  background: var(--color-soft);
}

.section-heading {
  margin-bottom: 1.6rem;
}

.card-grid,
.work-list {
  display: grid;
  gap: 0;
}

.project-card,
.work-note,
.project-row,
.article-row {
  border-top: 1px solid var(--color-border);
  background: transparent;
  transition: background 160ms ease;
}

.project-card {
  display: flex;
  min-height: 0;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.4rem 0;
}

.project-card:hover,
.work-note:hover,
.project-row:hover,
.article-row:hover {
  background: rgba(238, 246, 255, 0.58);
}

.text-link {
  color: var(--color-accent);
  font-weight: 680;
  text-decoration: underline;
  text-decoration-color: rgba(1, 118, 211, 0.28);
  text-underline-offset: 0.22em;
}

.text-link:hover {
  color: var(--color-accent-dark);
  text-decoration-color: currentColor;
}

.project-list,
.article-list {
  display: grid;
  padding-bottom: 5rem;
}

.work-note {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 1.5rem;
  padding: 1.35rem 0;
}

.work-note:last-child,
.project-row:last-child,
.article-row:last-child {
  border-bottom: 1px solid var(--color-border);
}

.project-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem 0;
}

.project-row h2,
.article-row h2 {
  margin-bottom: 0.55rem;
  font-size: 1.35rem;
}

.article-row {
  padding: 1.5rem 0;
}

.principle-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.principle-list p {
  margin-bottom: 0;
}

.contact-panel {
  margin-top: 2rem;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding-block: 1.5rem;
}

.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.contact-value {
  color: var(--color-text);
  font-size: 1.2rem;
  font-weight: 680;
}

.copy-button {
  min-height: 38px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  font: inherit;
  font-weight: 680;
  padding: 0.45rem 0.75rem;
  transition: background 160ms ease, border-color 160ms ease;
}

.copy-button:hover {
  border-color: #b8cbe1;
  background: rgba(238, 246, 255, 0.72);
}

.copy-status {
  min-height: 1.5rem;
  margin: 0.75rem 0 0;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.case-hero {
  padding-bottom: 3rem;
}

.case-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0 0;
}

.case-summary div {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  padding: 1rem;
}

.case-summary dt {
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

.case-summary dd {
  margin: 0.3rem 0 0;
  font-weight: 680;
  line-height: 1.35;
}

.case-section {
  padding-block: 2rem;
  border-top: 1px solid var(--color-border);
}

.content-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-muted);
}

.content-list li + li {
  margin-top: 0.7rem;
}

.diagram-placeholder {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-items: center;
  gap: 0.6rem;
  margin: 1.5rem 0;
  border: 1px dashed #9db9d8;
  border-radius: var(--radius);
  background: linear-gradient(180deg, #ffffff, #f1f7ff);
  padding: 1rem;
}

.diagram-placeholder div {
  display: grid;
  min-height: 84px;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: 0.75rem;
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
}

.diagram-placeholder span {
  display: none;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 2rem;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-content p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1rem;
  color: var(--color-muted);
  font-weight: 650;
}

.footer-links a:hover {
  color: var(--color-text);
}

@media (max-width: 760px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    inset: 72px 1rem auto 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    padding: 0.75rem;
    box-shadow: var(--shadow-sm);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 0.85rem;
  }

  .section,
  .section-lg,
  .page {
    padding-block: 3.5rem;
  }

  .intro {
    padding-top: 3.5rem;
  }

  .card-grid,
  .work-list,
  .case-summary,
  .diagram-placeholder {
    grid-template-columns: 1fr;
  }

  .project-card {
    min-height: 0;
  }

  .work-note,
  .project-row {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .project-row .button {
    width: 100%;
  }

  .principle-list {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .footer-content {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}