/* ============================================================
   CHEMISTRY — SITE FOUNDATION
   Shared across homepage, /work, /sectors, /approach.
   Owns the type system, nav, footer, and global rhythm.
   Page-specific styles live in each HTML file.
   ============================================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body { font-family: 'Fraunces', Georgia, serif; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }

:root {
  --gutter: clamp(24px, 4vw, 64px);
  --max: 1600px;
  --col-gap: 24px;
  --rhythm: clamp(96px, 12vw, 192px);

  --display: 'Fraunces', Georgia, serif;
  --italic:  'Fraunces', Georgia, serif;
  --body:    'Fraunces', Georgia, serif;
  --mono:    'JetBrains Mono', ui-monospace, monospace;
}

/* ============================================================
   TYPE
   ============================================================ */

em {
  font-variation-settings: "opsz" 144, "SOFT" 50;
  font-feature-settings: "ss01";
}

/* Override legacy families from colors_and_type.css */
body, html { font-family: 'Fraunces', Georgia, serif !important; }
.body, .prose, .lede, .h-hero, .h-display, .h-1, .h-2, .h-3 {
  font-family: 'Fraunces', Georgia, serif;
}

.mono { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); font-feature-settings: "tnum"; }
.mono-dim { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); font-feature-settings: "tnum"; }

.idx { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; color: var(--fg-3); }
.idx::before { content: "("; }
.idx::after  { content: ")"; }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.lede {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(20px, 1.6vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-wrap: pretty;
}
.lede em { font-family: var(--italic); font-style: italic; font-weight: 400; color: var(--terracotta); letter-spacing: -0.005em; }

.body-sm {
  font-family: var(--display);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.55;
  color: var(--fg-2);
  letter-spacing: -0.005em;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ============================================================
   NAV — fixed, small, quiet
   ============================================================ */

header.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  padding: 20px 0;
  background: color-mix(in oklab, var(--paper) 85%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--rule);
  transition: background 300ms, border-color 300ms, color 300ms;
}
header.nav.on-dark {
  background: color-mix(in oklab, var(--ink) 82%, transparent);
  border-bottom-color: rgba(240,232,216,0.14);
  color: var(--bone);
}
header.nav.on-dark .nav-center,
header.nav.on-dark .nav-logo,
header.nav.on-dark .btn-contact { color: var(--bone); }
header.nav.on-dark .btn-contact { border-color: rgba(240,232,216,0.4); }
header.nav.on-dark .btn-contact:hover { background: var(--bone); color: var(--ink); border-color: var(--bone); }
header.nav.on-dark .nav-right .loc { color: rgba(240,232,216,0.55); }

.nav-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}
.nav-logo {
  display: flex; align-items: baseline; gap: 8px;
  font-family: var(--display); font-weight: 400;
  font-size: 18px; letter-spacing: -0.02em;
}
.nav-logo .mark {
  width: 22px; height: 22px;
  display: inline-grid; place-items: center;
  background: var(--ink); color: var(--paper);
  font-family: var(--italic); font-style: italic; font-weight: 400;
  font-size: 14px; border-radius: 50%;
  transform: translateY(2px);
  font-variation-settings: "opsz" 144, "SOFT" 50;
  transition: background 300ms, color 300ms;
}
header.nav.on-dark .nav-logo .mark { background: var(--bone); color: var(--ink); }

.nav-center {
  display: flex; gap: 32px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink);
}
.nav-center a { position: relative; padding-bottom: 2px; }
.nav-center a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 100%;
  height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left;
  transition: transform 300ms cubic-bezier(.65,.05,.36,1);
}
.nav-center a:hover::after,
.nav-center a[aria-current="page"]::after { transform: scaleX(1); }
.nav-center a[aria-current="page"] { color: var(--terracotta); }

.nav-right {
  display: flex; align-items: center; gap: 20px; justify-self: end;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
}
.nav-right .loc { color: var(--fg-3); }

.btn-contact {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink);
  transition: background 300ms, color 300ms, border-color 300ms;
}
.btn-contact::after {
  content: "↗"; font-family: var(--display); letter-spacing: 0; font-size: 12px;
  transition: transform 300ms cubic-bezier(.65,.05,.36,1);
}
.btn-contact:hover { background: var(--ink); color: var(--paper); }
.btn-contact:hover::after { transform: translate(2px, -2px); }

/* ============================================================
   FOOTER
   ============================================================ */
footer.site-foot {
  background: var(--ink);
  color: rgba(240,232,216,0.55);
  padding: 56px 0 40px;
  border-top: 1px solid rgba(240,232,216,0.14);
}
footer.site-foot .foot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 64px;
}
footer.site-foot .foot-col { display: flex; flex-direction: column; gap: 12px; }
footer.site-foot .foot-col .label {
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(240,232,216,0.4);
}
footer.site-foot .foot-col a, footer.site-foot .foot-col span {
  font-family: var(--display);
  font-weight: 300;
  font-size: 16px;
  color: var(--bone);
  letter-spacing: -0.005em;
  line-height: 1.4;
}
footer.site-foot .foot-col a em,
footer.site-foot .foot-col span em {
  font-family: var(--italic); font-style: italic; color: var(--terracotta-soft); font-weight: 400;
}
footer.site-foot .foot-col a:hover { color: var(--terracotta-soft); }

footer.site-foot .sector-line {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 12px 36px;
  padding: 32px 0;
  border-top: 1px solid rgba(240,232,216,0.14);
  border-bottom: 1px solid rgba(240,232,216,0.14);
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  color: rgba(240,232,216,0.55);
  margin-bottom: 40px;
}
footer.site-foot .sector-line .sep { color: rgba(240,232,216,0.3); }

footer.site-foot .foot-base {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px; align-items: center;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(240,232,216,0.4);
}
footer.site-foot .foot-base .right { justify-self: end; display: flex; gap: 20px; }
footer.site-foot .foot-base .right a:hover { color: var(--bone); }
footer.site-foot .foot-base .center { justify-self: center; }

/* ============================================================
   REVEAL
   ============================================================ */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 900ms cubic-bezier(.65,.05,.36,1), transform 900ms cubic-bezier(.65,.05,.36,1); }
.reveal.is-in { opacity: 1; transform: translateY(0); }

/* ============================================================
   RESPONSIVE CHROME
   ============================================================ */
@media (max-width: 1024px) {
  footer.site-foot .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-inner { grid-template-columns: auto 1fr auto; }
  footer.site-foot .foot-grid { grid-template-columns: 1fr; }
  footer.site-foot .foot-base { grid-template-columns: 1fr; gap: 8px; }
  footer.site-foot .foot-base .right, footer.site-foot .foot-base .center { justify-self: start; }
}