:root {
  --color-ink: #101512;
  --color-ink-soft: #2f3935;
  --color-muted: #65706b;
  --color-paper: #f7f6ef;
  --color-surface: #ffffff;
  --color-line: rgba(16, 21, 18, 0.14);
  --color-line-strong: rgba(16, 21, 18, 0.24);
  --color-moss: #2f5b4d;
  --color-steel: #405f78;
  --color-clay: #8a6456;
  --color-gold: #b79b55;
  --color-plum: #4f3e57;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;
  --radius: 8px;
  --max-width: 1180px;
  --header-height: 76px;
  --shadow-soft: 0 22px 70px rgba(16, 21, 18, 0.09);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

canvas,
svg {
  display: block;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-moss);
}

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

:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  left: var(--space-3);
  top: var(--space-3);
  z-index: 100;
  transform: translateY(-160%);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-ink);
  padding: 0.7rem 1rem;
  box-shadow: var(--shadow-soft);
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  height: var(--header-height);
  border-bottom: 1px solid rgba(247, 246, 239, 0.12);
  background: rgba(16, 21, 18, 0.58);
  color: var(--color-paper);
  backdrop-filter: blur(18px);
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-line);
  background: rgba(247, 246, 239, 0.93);
  color: var(--color-ink);
}

.nav-shell {
  width: min(100% - 2rem, var(--max-width));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 650;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border: 1px solid currentColor;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
  font-family: var(--font-serif);
  font-size: 0.86rem;
  line-height: 1;
}

.brand-name {
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  font-size: 0.93rem;
}

.nav-links a {
  position: relative;
  color: currentColor;
  text-decoration: none;
  opacity: 0.84;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.35rem;
  height: 1px;
  background: currentColor;
  opacity: 0;
  transform: scaleX(0.2);
  transform-origin: center;
  transition: transform 180ms ease, opacity 180ms ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: currentColor;
  opacity: 1;
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid currentColor;
  border-radius: 50%;
  background: transparent;
  color: currentColor;
  display: none;
  place-items: center;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 1px;
  background: currentColor;
  grid-area: 1 / 1;
  transition: transform 180ms ease;
}

.nav-toggle span:first-child {
  transform: translateY(-4px);
}

.nav-toggle span:last-child {
  transform: translateY(4px);
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: rotate(42deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: rotate(-42deg);
}

.hero {
  position: relative;
  min-height: 92svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: calc(var(--header-height) + var(--space-8)) 0 var(--space-7);
}

.hero-canvas,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-canvas {
  opacity: 0.9;
}

.hero-shade {
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(16, 21, 18, 0.9), rgba(16, 21, 18, 0.55) 54%, rgba(16, 21, 18, 0.2)),
    linear-gradient(180deg, rgba(16, 21, 18, 0.16), rgba(16, 21, 18, 0.9));
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.eyebrow,
.section-kicker {
  margin: 0 0 var(--space-3);
  color: var(--color-moss);
  font-size: 0.85rem;
  font-weight: 720;
}

.hero .eyebrow {
  color: #d9c47a;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 5.6rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.98;
}

.hero-lede {
  width: min(700px, 100%);
  margin: var(--space-4) 0 0;
  color: rgba(247, 246, 239, 0.86);
  font-size: 1.2rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  padding: 0.78rem 1.08rem;
  font-weight: 670;
  line-height: 1.2;
  text-decoration: none;
}

.button-primary {
  background: var(--color-paper);
  border-color: var(--color-paper);
  color: var(--color-ink);
}

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

.button-secondary {
  border-color: rgba(247, 246, 239, 0.52);
  color: var(--color-paper);
}

.button-secondary:hover {
  border-color: #ffffff;
  color: #ffffff;
}

.hero-next {
  position: absolute;
  left: 50%;
  bottom: var(--space-4);
  z-index: 2;
  width: 1px;
  height: 56px;
  background: rgba(247, 246, 239, 0.2);
}

.hero-next span {
  display: block;
  width: 1px;
  height: 18px;
  background: rgba(247, 246, 239, 0.82);
  animation: scrollCue 2.4s ease-in-out infinite;
}

@keyframes scrollCue {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.35;
  }

  50% {
    transform: translateY(34px);
    opacity: 1;
  }
}

.section {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-line);
}

.section-inner {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-7);
  align-items: start;
}

.two-column.reverse {
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
}

.section-heading {
  max-width: 580px;
}

.section-heading.compact {
  max-width: 780px;
  margin-bottom: var(--space-5);
}

.section h2 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.08;
}

.section h3 {
  margin: 0;
  color: var(--color-ink);
  font-size: 1.18rem;
  line-height: 1.3;
}

.section-copy p,
.section-heading.compact p,
.service-card p,
.research-item p,
.project-card p,
.contact-panel p {
  color: var(--color-ink-soft);
}

.section-copy p:first-child {
  margin-top: 0;
  font-size: 1.16rem;
}

.principle-list {
  margin: var(--space-5) 0 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--color-line);
  background: var(--color-line);
}

.principle-list div {
  display: grid;
  grid-template-columns: 0.36fr 0.64fr;
  gap: var(--space-4);
  background: var(--color-paper);
  padding: var(--space-4);
}

.principle-list dt {
  color: var(--color-ink);
  font-weight: 720;
}

.principle-list dd {
  margin: 0;
  color: var(--color-muted);
}

.section-consulting,
.section-projects {
  background: var(--color-surface);
}

.service-grid,
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.service-card,
.project-card {
  min-height: 310px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  padding: var(--space-5);
}

.service-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.service-index {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(47, 91, 77, 0.12);
  color: var(--color-moss);
  font-family: var(--font-serif);
}

.service-card h3 {
  margin-top: var(--space-6);
}

.service-card p {
  margin: var(--space-3) 0 0;
}

.research-list {
  display: grid;
  gap: var(--space-3);
}

.research-item {
  border-top: 1px solid var(--color-line-strong);
  padding: var(--space-4) 0 var(--space-3);
}

.research-label {
  margin: 0 0 var(--space-2);
  color: var(--color-clay);
  font-size: 0.84rem;
  font-weight: 720;
}

.research-item p:last-child {
  margin-bottom: 0;
}

.project-card {
  display: flex;
  flex-direction: column;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: var(--space-6);
}

.project-meta span {
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 0.22rem 0.58rem;
  color: var(--color-muted);
  font-size: 0.78rem;
  line-height: 1.3;
}

.project-card p {
  margin-bottom: var(--space-5);
}

.project-card a {
  margin-top: auto;
  color: var(--color-moss);
  font-weight: 720;
  text-decoration: none;
}

.project-card a::after {
  content: " ->";
}

.section-notes {
  background:
    linear-gradient(180deg, rgba(64, 95, 120, 0.06), transparent 58%),
    var(--color-paper);
}

.notes-list {
  display: grid;
  border-top: 1px solid var(--color-line-strong);
}

.note-link {
  min-height: 86px;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: var(--space-4);
  align-items: center;
  border-bottom: 1px solid var(--color-line);
  text-decoration: none;
}

.note-link span {
  color: var(--color-clay);
  font-size: 0.84rem;
  font-weight: 720;
}

.note-link strong {
  color: var(--color-ink);
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1.25;
}

.note-link:hover strong {
  color: var(--color-moss);
}

.section-contact {
  background: var(--color-ink);
  color: var(--color-paper);
}

.section-contact h2,
.section-contact .section-kicker {
  color: var(--color-paper);
}

.contact-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: var(--space-7);
  align-items: start;
}

.contact-panel {
  border: 1px solid rgba(247, 246, 239, 0.18);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.contact-panel p {
  color: rgba(247, 246, 239, 0.76);
}

.contact-email {
  display: inline-flex;
  margin-top: var(--space-3);
  color: var(--color-paper);
  font-family: var(--font-serif);
  font-size: 1.55rem;
  text-decoration: none;
}

.contact-email:hover {
  color: #d9c47a;
}

.contact-chinese {
  margin-bottom: 0;
  font-family: var(--font-serif);
}

.site-footer {
  background: var(--color-ink);
  color: rgba(247, 246, 239, 0.72);
  border-top: 1px solid rgba(247, 246, 239, 0.14);
  padding: var(--space-4) 0;
}

.footer-inner {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: 0.9rem;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer-links a {
  color: inherit;
  text-decoration: none;
}

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

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

@media (max-width: 980px) {
  :root {
    --header-height: 70px;
    --space-8: 4.5rem;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 1rem;
    right: 1rem;
    display: grid;
    gap: 0;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    background: rgba(247, 246, 239, 0.98);
    color: var(--color-ink);
    box-shadow: var(--shadow-soft);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .nav-links.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-links a {
    min-height: 52px;
    display: flex;
    align-items: center;
    padding: 0 var(--space-4);
    border-bottom: 1px solid var(--color-line);
    opacity: 1;
  }

  .nav-links a:last-child {
    border-bottom: 0;
  }

  .nav-links a::after {
    display: none;
  }

  .hero h1 {
    font-size: 4rem;
  }

  .hero-lede {
    font-size: 1.05rem;
  }

  .two-column,
  .two-column.reverse,
  .contact-inner {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .section h2 {
    font-size: 2.45rem;
  }

  .service-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .service-card,
  .project-card {
    min-height: auto;
  }

  .contact-panel {
    width: min(100%, 520px);
  }
}

@media (max-width: 640px) {
  :root {
    --space-7: 3rem;
    --space-8: 3.75rem;
  }

  .nav-shell,
  .section-inner,
  .hero-inner,
  .footer-inner {
    width: min(100% - 1.25rem, var(--max-width));
  }

  .brand-name {
    display: none;
  }

  .hero {
    min-height: 90svh;
    padding-bottom: var(--space-6);
  }

  .hero h1 {
    font-size: 3.1rem;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .section {
    padding: var(--space-7) 0;
  }

  .section h2 {
    font-size: 2.05rem;
  }

  .principle-list div {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .note-link {
    grid-template-columns: 1fr;
    gap: var(--space-1);
    padding: var(--space-4) 0;
  }

  .note-link strong {
    font-size: 1.18rem;
  }

  .contact-email {
    font-size: 1.28rem;
    overflow-wrap: anywhere;
  }

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

  .footer-links {
    flex-wrap: wrap;
  }
}