/* ============================================================
   Allusion — site stylesheet
   After Mazois, Les Ruines de Pompei (1812)
   Five-token palette · Newsreader + Hanken Grotesk
   ============================================================ */

:root {
  --petrol:       #1F3539;
  --petrol-deep:  #152428;
  --bone:         #ECEAE2;
  --paper:        #F4F2EA;
  --ochre:        #C8932E;
  --ink:          #0F0E0C;
  --slate:        #6F7C8A;

  /* Heritage carve-outs (semantic warn only — not for chrome) */
  --pompeian-red: #9D472F;

  --serif: 'Newsreader', 'Times New Roman', Georgia, serif;
  --sans:  'Hanken Grotesk', -apple-system, system-ui, sans-serif;

  --rule: 1px solid rgba(15, 14, 12, 0.12);
  --rule-on-petrol: 1px solid rgba(236, 234, 226, 0.16);

  --max: 1140px;
  --pad: clamp(1.5rem, 5vw, 4rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bone);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ----- structural ------------------------------------------- */

.inner { max-width: var(--max); margin: 0 auto; }
.section { padding: clamp(4rem, 9vw, 7rem) var(--pad); position: relative; }
.section.dark { background: var(--petrol); color: var(--bone); }
.section.paper { background: var(--paper); }
.section.bone { background: var(--bone); }

.rule { border: 0; border-top: var(--rule); margin: 2.5rem 0; }
.section.dark .rule { border-top: var(--rule-on-petrol); }

/* ----- type system ----------------------------------------- */

.eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  display: inline-block;
  margin-bottom: 1rem;
}
.section.dark .eyebrow { color: var(--bone); opacity: 0.66; }

.display {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.018em;
  line-height: 1;
}
h1.display { font-size: clamp(54px, 9vw, 124px); margin-bottom: 1.5rem; }
h2.display { font-size: clamp(40px, 5.6vw, 72px); margin-bottom: 1.25rem; }
h3.display { font-size: clamp(28px, 3.4vw, 40px); margin-bottom: 0.75rem; }

.subhead {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--slate);
}

.lede {
  font-family: var(--serif);
  font-size: clamp(20px, 1.6vw, 24px);
  line-height: 1.5;
  max-width: 680px;
  margin-bottom: 1.5rem;
  font-weight: 400;
}

p { max-width: 640px; margin-bottom: 1.25rem; }
p + p { margin-top: -0.25rem; }

.italic { font-style: italic; }
.ochre  { color: var(--ochre); }
.petrol { color: var(--petrol); }
.slate  { color: var(--slate); }

::selection { background: var(--ochre); color: var(--ink); }

/* ----- navigation ----------------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--bone);
  border-bottom: var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.nav.on-petrol {
  background: var(--petrol);
  color: var(--bone);
  border-bottom: var(--rule-on-petrol);
}
.nav .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem var(--pad);
  max-width: none;
}
.nav .brand {
  font-family: var(--serif);
  font-style: italic;
  font-size: 22px;
  letter-spacing: -0.01em;
  text-transform: none;
  font-weight: 400;
  color: inherit;
}
.nav .brand .dot { color: var(--ochre); }
.nav ul {
  list-style: none;
  display: flex;
  gap: clamp(1rem, 3vw, 2.25rem);
}
.nav a { color: inherit; opacity: 0.86; }
.nav a:hover { opacity: 1; }
.nav a.active { opacity: 1; border-bottom: 1px solid var(--ochre); padding-bottom: 2px; }
.nav .hamburger { display: none; cursor: pointer; font-size: 18px; line-height: 1; }

@media (max-width: 680px) {
  .nav .hamburger { display: inline-block; }
  .nav ul {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--bone);
    border-bottom: var(--rule);
    padding: 1rem var(--pad);
    gap: 0.75rem;
  }
  .nav.on-petrol ul { background: var(--petrol); border-bottom-color: rgba(236, 234, 226, 0.16); }
  .nav.open ul { display: flex; }
}

/* ----- hero --------------------------------------------- */

.hero {
  background: var(--petrol);
  color: var(--bone);
  min-height: 88vh;
  padding: clamp(3rem, 8vw, 6rem) var(--pad) clamp(3rem, 6vw, 5rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.hero .topmark {
  display: flex; justify-content: space-between; gap: 1rem;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bone);
  opacity: 0.66;
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
}
.hero .center { margin: auto 0; max-width: var(--max); margin-left: auto; margin-right: auto; width: 100%; }
.hero h1 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(48px, 8vw, 124px);
  line-height: 1.04;
  color: var(--bone);
  letter-spacing: -0.02em;
  max-width: 14ch;
}
.hero h1 .accent { color: var(--ochre); }
.hero .sub {
  font-family: var(--serif);
  font-size: clamp(20px, 1.8vw, 24px);
  color: var(--bone);
  max-width: 640px;
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  opacity: 0.92;
}
.hero .bottom {
  display: flex; justify-content: space-between; align-items: end;
  gap: 1rem; flex-wrap: wrap;
  max-width: var(--max); margin: 0 auto; width: 100%;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone);
  opacity: 0.66;
}

/* ----- CTA / links ------------------------------------- */

.cta {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--ochre);
  border-bottom: 1px solid var(--ochre);
  padding-bottom: 4px;
  display: inline-block;
  transition: color 0.18s ease;
}
.cta:hover { color: var(--bone); border-bottom-color: var(--bone); }
.section.bone .cta:hover, .section.paper .cta:hover { color: var(--ink); border-bottom-color: var(--ink); }

.text-link {
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: opacity 0.2s ease;
}
.text-link:hover { opacity: 0.7; }

/* ----- pillar grid (home) ------------------------------ */

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: var(--rule);
}
.pillars > a {
  padding: clamp(2rem, 4vw, 3rem) clamp(1.5rem, 2vw, 2rem);
  border-right: var(--rule);
  border-bottom: var(--rule);
  background: var(--bone);
  transition: background 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 280px;
}
.pillars > a:last-child { border-right: 0; }
.pillars > a:hover { background: var(--paper); }
.pillars .num {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.5rem;
}
.pillars h3 {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.1;
  margin-bottom: 1rem;
  font-weight: 400;
}
.pillars p {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.55;
  margin: 0;
}
.pillars .arrow {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ochre);
  margin-top: 1.5rem;
}

@media (max-width: 880px) {
  .pillars { grid-template-columns: 1fr; }
  .pillars > a { border-right: 0; }
}

/* ----- two-col layout ---------------------------------- */

.two-col {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.two-col aside {
  position: sticky; top: 84px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}
@media (max-width: 800px) {
  .two-col { grid-template-columns: 1fr; }
  .two-col aside { position: static; }
}

/* ----- portfolio grid --------------------------------- */

.filter-bar {
  display: flex; flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 2.5rem 0 2rem;
  padding-bottom: 1rem;
  border-bottom: var(--rule);
}
.filter-bar button {
  background: transparent; border: 0; padding: 0; cursor: pointer;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
}
.filter-bar button .count { color: var(--ink); margin-left: 0.5em; }
.filter-bar button.active { color: var(--ink); }
.filter-bar button.active .count { color: var(--ochre); }
.filter-bar button:hover { color: var(--ink); }

.portfolio {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 0;
  border-top: var(--rule);
  border-left: var(--rule);
}
.portfolio article {
  border-right: var(--rule);
  border-bottom: var(--rule);
  padding: clamp(2rem, 3vw, 2.5rem);
  background: var(--bone);
  display: flex; flex-direction: column;
  min-height: 360px;
}
.portfolio article .num {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
}
.portfolio article .num .sector { color: var(--slate); }
.portfolio article .monogram {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 56px;
  line-height: 1;
  color: var(--petrol);
  margin-bottom: 1.25rem;
}
.portfolio article h3 {
  font-family: var(--serif);
  font-style: normal;
  font-weight: 500;
  font-size: 22px;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}
.portfolio article .tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 17px;
  line-height: 1.45;
  color: var(--petrol);
  margin-bottom: 1rem;
}
.portfolio article .thesis {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 1.25rem;
}
.portfolio article .meta {
  margin-top: auto;
  padding-top: 1rem;
  border-top: var(--rule);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}
.portfolio article .meta .label { display: block; opacity: 0.7; margin-bottom: 2px; }
.portfolio article .meta .value { color: var(--ink); font-family: var(--serif); text-transform: none; letter-spacing: 0; font-size: 13px; font-style: italic; }
.portfolio article .visit {
  margin-top: 1rem;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ochre);
}
.portfolio article .visit:hover { color: var(--ink); }
.portfolio article[hidden] { display: none; }

/* ----- approach (sparring partner) -------------------- */

.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 4rem;
  margin-top: 2rem;
}
.approach-grid > div { border-top: var(--rule); padding-top: 1.5rem; }
.section.dark .approach-grid > div { border-top: var(--rule-on-petrol); }
.approach-grid h4 {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ochre);
  margin-bottom: 0.75rem;
}
.approach-grid p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.55;
  margin: 0;
}
@media (max-width: 720px) {
  .approach-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ----- team ------------------------------------------- */

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0;
  border-top: var(--rule);
  border-left: var(--rule);
}
.team-grid article {
  border-right: var(--rule);
  border-bottom: var(--rule);
  padding: 2rem 2rem 2.5rem;
  background: var(--bone);
}
.team-grid .role {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 1rem;
}
.team-grid h3 {
  font-family: var(--serif);
  font-style: italic;
  font-size: 28px;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  font-weight: 400;
}
.team-grid p {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
}

/* ----- logo concepts (about page) --------------------- */

.logo-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: var(--rule);
  border-left: var(--rule);
  margin: 2.5rem 0;
}
.logo-trio figure {
  border-right: var(--rule);
  border-bottom: var(--rule);
  background: var(--bone);
  padding: 0;
  display: flex;
  flex-direction: column;
}
.logo-trio .swatch {
  height: 240px;
  display: flex; align-items: center; justify-content: center;
  background: var(--petrol);
  padding: 1.5rem;
}
.logo-trio .swatch svg { max-width: 80%; max-height: 100%; }
.logo-trio .swatch.invert { background: var(--bone); }
.logo-trio figcaption { padding: 1.5rem 2rem 2rem; }
.logo-trio .badge {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ochre);
  margin-bottom: 0.5rem;
  display: block;
}
.logo-trio h4 {
  font-family: var(--serif);
  font-style: italic;
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 0.75rem;
}
.logo-trio p {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
}
@media (max-width: 900px) {
  .logo-trio { grid-template-columns: 1fr; }
  .logo-trio figure { border-right: 0; }
}

/* ----- contact ---------------------------------------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 2.5rem;
}
.contact-grid h4 {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.5rem;
}
.contact-grid .big {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(28px, 3vw, 36px);
  line-height: 1.2;
  margin-bottom: 0.75rem;
  font-weight: 400;
}
.contact-grid p { margin-bottom: 0.75rem; }
@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ----- footer ----------------------------------------- */

.footer {
  background: var(--petrol);
  color: var(--bone);
  padding: 4rem var(--pad) 2.5rem;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.footer .inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  align-items: start;
  margin: 0 auto;
}
.footer .brand {
  font-family: var(--serif);
  font-style: italic;
  font-size: 32px;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--bone);
  margin-bottom: 1rem;
  font-weight: 400;
}
.footer .brand .dot { color: var(--ochre); }
.footer h5 {
  color: var(--bone);
  opacity: 0.66;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  margin-bottom: 0.75rem;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 0.5rem; }
.footer a { color: var(--bone); opacity: 0.86; }
.footer a:hover { color: var(--ochre); opacity: 1; }
.footer .colophon {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: var(--rule-on-petrol);
  display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
  color: var(--bone); opacity: 0.5;
  font-size: 10px;
  letter-spacing: 0.22em;
  max-width: var(--max); margin-left: auto; margin-right: auto;
}
@media (max-width: 880px) {
  .footer .inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer .inner { grid-template-columns: 1fr; }
}

/* ----- utility ---------------------------------------- */

.spacer-sm { height: 1rem; }
.spacer-md { height: 2rem; }
.spacer-lg { height: 4rem; }
.maxw-680 { max-width: 680px; }
.maxw-540 { max-width: 540px; }