:root {
  --ink: #0A0A0A;
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --muted: #6E6E6E;
  --hairline: #E6E6E6;
  --accent: #FF3B1F;
  --accent-ink: #FFFFFF;
  --invert-bg: #0A0A0A;
  --invert-ink: #FAFAFA;
  --invert-muted: #9A9A9A;
  --invert-hairline: #1F1F1F;

  --max: 1180px;
  --gutter: clamp(1.25rem, 3vw, 2rem);
  --section-y: clamp(4rem, 9vw, 7.5rem);
  --radius: 2px;

  --font-sans: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --t-quick: 120ms ease;
  --t-base: 220ms cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
*::selection { background: var(--ink); color: var(--bg); }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  line-height: 1.55;
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* ---------- Layout primitives ---------- */

.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--hairline);
}

.section--invert {
  background: var(--invert-bg);
  color: var(--invert-ink);
  border-color: var(--invert-hairline);
}

.section--contact {
  padding-block: clamp(5rem, 10vw, 9rem);
}

.section__head {
  display: grid;
  gap: 0.75rem;
  max-width: 46rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section__title {
  font-size: clamp(1.875rem, 1.2rem + 2.8vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0;
  font-weight: 600;
}

.section__lede {
  color: var(--muted);
  font-size: 1.0625rem;
  max-width: 38rem;
  margin: 0;
}

.section--invert .section__lede { color: var(--invert-muted); }

.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
  font-weight: 500;
}

.eyebrow--invert { color: var(--invert-muted); }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--hairline);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 999px;
}

.brand__name {
  font-size: 1rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--muted);
  transition: color var(--t-quick);
}

.nav-link:hover { color: var(--ink); }

.nav-link--cta {
  color: var(--ink);
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  transition: background var(--t-quick), color var(--t-quick);
}

.nav-link--cta:hover {
  background: var(--ink);
  color: var(--bg);
}

@media (max-width: 540px) {
  .brand__name { display: none; }
  .site-nav { gap: 1rem; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.25rem;
  font: inherit;
  font-weight: 500;
  font-size: 0.9375rem;
  letter-spacing: -0.005em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-quick), background var(--t-quick), color var(--t-quick), border-color var(--t-quick);
  will-change: transform;
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--ink);
  color: var(--bg);
}
.btn--primary:hover { background: var(--accent); color: var(--accent-ink); }

.btn--ghost {
  border-color: var(--ink);
  color: var(--ink);
}
.btn--ghost:hover { background: var(--ink); color: var(--bg); }

.section--invert .btn--primary { background: var(--invert-ink); color: var(--invert-bg); }
.section--invert .btn--primary:hover { background: var(--accent); color: var(--accent-ink); }

.btn--lg {
  padding: 1.1rem 1.6rem;
  font-size: 1.0625rem;
}

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(5rem, 12vw, 9rem) clamp(4rem, 9vw, 7rem);
}

.hero__title {
  font-size: clamp(2.5rem, 1.4rem + 5.6vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 600;
  margin: 1.25rem 0 1.5rem;
  max-width: 18ch;
}

.hero__title .accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}

.hero__lede {
  font-size: clamp(1.0625rem, 0.95rem + 0.6vw, 1.25rem);
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem 2rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  max-width: 44rem;
}

.hero__meta li {
  display: grid;
  gap: 0.25rem;
}

.hero__meta-num {
  font-size: clamp(1.5rem, 1.1rem + 1.2vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero__meta-label {
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

@media (max-width: 540px) {
  .hero__meta { grid-template-columns: 1fr; }
}

/* ---------- Services ---------- */

.services {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

@media (max-width: 720px) {
  .services { grid-template-columns: 1fr; }
}

.service {
  background: var(--surface);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  gap: 1rem;
  transition: background var(--t-base);
}

.service:hover { background: color-mix(in srgb, var(--bg) 60%, var(--surface)); }

.service__head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.service__id {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
}

.service__title {
  font-size: clamp(1.25rem, 1rem + 0.6vw, 1.5rem);
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.service__blurb {
  color: var(--muted);
  margin: 0;
}

.service__bullets {
  display: grid;
  gap: 0.4rem;
}

.service__bullets li {
  font-size: 0.9375rem;
  padding-left: 1.1rem;
  position: relative;
  color: var(--ink);
}

.service__bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.5rem;
  height: 1px;
  background: var(--accent);
}

/* ---------- Philosophy ---------- */

.philosophy {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.philosophy__lead { position: sticky; top: 6rem; }

@media (max-width: 820px) {
  .philosophy { grid-template-columns: 1fr; }
  .philosophy__lead { position: static; }
}
.philosophy__lead .section__title { margin-top: 0.5rem; }

.philosophy__body p {
  font-size: clamp(1.0625rem, 0.95rem + 0.55vw, 1.25rem);
  line-height: 1.55;
  margin: 0 0 1.25rem;
  color: var(--invert-ink);
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--invert-hairline);
  margin-top: 1.5rem;
  border: 1px solid var(--invert-hairline);
}

@media (max-width: 520px) {
  .principles { grid-template-columns: 1fr; }
}

.principles li {
  background: var(--invert-bg);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
}

.principles strong {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.principles span {
  color: var(--invert-muted);
  font-size: 0.9375rem;
}

/* ---------- Contact ---------- */

.contact {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (max-width: 720px) {
  .contact { grid-template-columns: 1fr; }
}

.contact__lede {
  color: var(--muted);
  font-size: 1.0625rem;
  max-width: 32rem;
  margin: 1rem 0 0;
}

.contact__action {
  display: grid;
  gap: 0.75rem;
  justify-items: start;
}

.contact__fine {
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0;
}

/* ---------- Footer ---------- */

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

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  color: var(--muted);
}

.site-footer__tag {
  font-style: italic;
}

/* ---------- Dark mode ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #FAFAFA;
    --bg: #0A0A0A;
    --surface: #111111;
    --muted: #9A9A9A;
    --hairline: #1F1F1F;
    --accent: #FF6B4A;
    --invert-bg: #FAFAFA;
    --invert-ink: #0A0A0A;
    --invert-muted: #6E6E6E;
    --invert-hairline: #E6E6E6;
  }

  .philosophy__body p { color: var(--invert-ink); }
  .principles li { background: var(--invert-bg); }
  .principles span { color: var(--invert-muted); }
  .brand__mark { filter: invert(1); }
}