:root {
  --paper: #f8f8f6;
  --ink: #16181d;
  --muted: #6b6f78;
  --line: #e3e2dd;
  --accent: #2f6f5e;
  --accent-soft: #eef3f1;
  --max: 64rem;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--paper);
  color: var(--ink);
  font-family:
    "Inter", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Layout */
.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}
main {
  flex: 1;
  width: 100%;
}
section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}
section + section {
  border-top: 1px solid var(--line);
}

/* Site header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.1) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.05rem;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  font-size: 0.82rem;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}
.brand .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-1px);
}
.nav-links {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  list-style: none;
  align-items: center;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.15s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
}
.nav-links a[aria-current="page"] {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 3px;
}
/* Hamburger button (hidden on desktop) */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}
.nav-burger {
  align-items: flex-start;
}
.nav-burger .bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition:
    transform 0.22s ease,
    opacity 0.18s ease;
}

@media (max-width: 40rem) {
  .nav {
    display: grid;
    grid-template-columns: 42px 1fr 42px;
    align-items: center;
    gap: 0;
  }
  .nav-burger {
    display: inline-flex;
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
  }
  .brand {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
  }
  #primary-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.28s ease;
  }
  .nav.open #primary-nav {
    max-height: 22rem;
  }
  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 0.4rem;
  }
  .nav-links a {
    display: block;
    width: 100%;
    padding: 0.75rem 0;
    font-size: 1.02rem;
    border-bottom: 1px solid var(--line);
  }
  .nav-links li:last-child a {
    border-bottom: none;
  }
  .nav-links a[aria-current="page"] {
    color: var(--accent);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem 0;
  }
  .nav.open .nav-burger .bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav.open .nav-burger .bar:nth-child(2) {
    opacity: 0;
  }
  .nav.open .nav-burger .bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* Type */
.eyebrow {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1rem;
}
h1 {
  font-size: clamp(2.3rem, 6.5vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
  font-weight: 700;
  text-wrap: balance;
}
h1 .accent {
  color: var(--accent);
}
h2 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 700;
  text-wrap: balance;
}
h3 {
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  font-weight: 650;
}
.lede {
  font-size: clamp(1.05rem, 2.2vw, 1.32rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 38rem;
}
p.body {
  color: var(--muted);
  max-width: 40rem;
  font-size: 1.02rem;
}
p.body + p.body {
  margin-top: 1.1rem;
}
.section-head {
  max-width: 42rem;
  margin-bottom: clamp(2rem, 5vw, 3rem);
}
.section-head p {
  color: var(--muted);
  margin-top: 0.9rem;
  font-size: 1.05rem;
}

/* Hero */
.hero {
  padding: clamp(3.5rem, 10vw, 7rem) 0 clamp(3rem, 7vw, 5rem);
}
.hero h1 {
  max-width: 20ch;
}
.hero .lede {
  margin-top: clamp(1.4rem, 3vw, 2rem);
}
.cta-row {
  margin-top: clamp(1.8rem, 4vw, 2.6rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.72rem 1.3rem;
  border-radius: 999px;
  transition:
    transform 0.12s ease,
    background 0.15s ease;
}
.btn:hover {
  background: var(--accent);
  transform: translateY(-1px);
}
.link-arrow {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
  transition: color 0.15s ease;
}
.link-arrow:hover {
  color: var(--accent);
}

/* Card grid */
.grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.6rem 1.5rem;
  transition:
    border-color 0.15s ease,
    transform 0.12s ease;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card .num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.card h3 {
  margin: 0.7rem 0 0.5rem;
}
.card p {
  color: var(--muted);
  font-size: 0.96rem;
}

/* Service detail blocks */
.stack {
  display: grid;
  gap: 1.25rem;
}
.service {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem 2.5rem;
  padding: clamp(1.6rem, 4vw, 2.4rem) 0;
  border-top: 1px solid var(--line);
}
.service:first-child {
  border-top: none;
  padding-top: 0;
}
@media (min-width: 46rem) {
  .service {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 2.5rem;
  }
}
.service .label {
  font-weight: 650;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.service .desc {
  color: var(--muted);
}
.service ul {
  margin-top: 0.9rem;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}
.service ul li {
  font-size: 0.82rem;
  color: var(--ink);
  background: var(--accent-soft);
  border: 1px solid var(--line);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

/* Definition rows (approach / principles) */
.rows {
  display: grid;
  gap: 0;
}
.row {
  display: grid;
  gap: 0.4rem 2.5rem;
  padding: 1.6rem 0;
  border-top: 1px solid var(--line);
}
.row:first-child {
  border-top: none;
}
@media (min-width: 46rem) {
  .row {
    grid-template-columns: 3.5rem 13rem minmax(0, 1fr);
    align-items: baseline;
  }
}
.row .idx {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}
.row .term {
  font-weight: 650;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.row .def {
  color: var(--muted);
}

/* Contact list */
.contact-grid {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  margin-top: 2rem;
}
.contact-item .k {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}
.contact-item .v {
  margin-top: 0.4rem;
  font-size: 1.08rem;
  font-weight: 600;
}
.contact-item a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}
.contact-item a:hover {
  color: var(--accent);
}

/* CTA band */
.band {
  background: var(--ink);
  color: var(--paper);
  border-radius: 18px;
  padding: clamp(2rem, 6vw, 3.5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
}
.band h2 {
  color: var(--paper);
  max-width: 22ch;
}
.band .btn {
  background: var(--paper);
  color: var(--ink);
}
.band .btn:hover {
  background: var(--accent);
  color: var(--paper);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}
.footer-inner {
  padding-block: 2.5rem;
  display: grid;
  gap: 1.75rem;
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  justify-content: space-between;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  list-style: none;
}
.footer-links a {
  color: var(--muted);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--ink);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}