/* ============ Plates — design tokens (Phase 2 §1) ============ */
:root {
  --paper: #F4F1EA;
  --ink: #131210;
  --hairline: #D6D0C6;

  --s1: 8px;  --s2: 16px; --s3: 24px;
  --s4: 48px; --s5: 96px; --s6: 160px;

  --max: 1360px;
  --margin: 72px;
  --gutter: 24px;
  --header-h: 64px;

  --t1: clamp(2.5rem, 6vw, 4.5rem);
  --t2-size: 11px;
  --t3-size: 14px;
  --body-size: 17px;
}
@media (max-width: 1023px) { :root { --margin: 48px; } }
@media (max-width: 767px)  { :root { --margin: 20px; --gutter: 16px; --header-h: 56px; } }

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: var(--body-size);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; width: 100%; height: auto; }
figure { margin: 0; }
picture { display: block; }
a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }

.t1 { font-size: var(--t1); font-weight: 500; letter-spacing: -0.01em; line-height: 1.02; margin: 0; }
.t2 { font-size: var(--t2-size); font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; }
.t3 { font-size: var(--t3-size); font-weight: 400; line-height: 1.5; }
.measure { max-width: 64ch; }

.wrap { max-width: calc(var(--max) + var(--margin) * 2); margin-inline: auto; padding-inline: var(--margin); }
.rule { border: 0; border-top: 1px solid var(--hairline); margin: 0; }

/* ============ Header / footer ============ */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--hairline);
  padding-top: env(safe-area-inset-top);
}
.site-header .bar {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
}
.site-nav { display: flex; gap: var(--s3); }
.site-nav a { padding: var(--s1) 0; }

.menu-btn {
  display: none;
  min-width: 44px; min-height: 44px;
  background: none; border: 0; font: inherit; color: var(--ink);
  cursor: pointer; padding: 0;
}
@media (max-width: 767px) {
  .site-nav { display: none; }
  .menu-btn { display: inline-flex; align-items: center; }
}
.mobile-menu {
  position: fixed; inset: 0; z-index: 30;
  background: var(--paper);
  padding: calc(env(safe-area-inset-top) + var(--s3)) var(--margin)
           calc(env(safe-area-inset-bottom) + var(--s3));
  display: none; flex-direction: column;
}
.mobile-menu.open { display: flex; }
.mobile-menu .mm-head { display: flex; justify-content: space-between; align-items: center; }
.mobile-menu nav { margin-top: var(--s5); display: flex; flex-direction: column; gap: var(--s3); }
.mobile-menu nav a { font-size: clamp(2rem, 8vw, 3rem); font-weight: 500; letter-spacing: -0.01em; }
body.menu-open { overflow: hidden; }

.site-footer { border-top: 1px solid var(--hairline); padding: var(--s4) 0 calc(var(--s4) + env(safe-area-inset-bottom)); }
.site-footer .cols { display: flex; justify-content: space-between; gap: var(--s3); flex-wrap: wrap; }

/* ============ Sections ============ */
.masthead { padding: var(--s6) 0; }
.masthead .t2 { margin: 0 0 var(--s3); }
.masthead p.statement { margin: var(--s3) 0 0; }
@media (max-width: 767px) { .masthead { padding: var(--s5) 0; } }

.section-label { display: flex; flex-direction: column; gap: var(--s2); margin-bottom: var(--s4); }
.section { padding-bottom: var(--s6); }
@media (max-width: 767px) { .section { padding-bottom: var(--s5); } }

/* ============ Plate system (Phase 2 §2) ============ */
.plates { display: flex; flex-direction: column; gap: 112px; }
@media (max-width: 767px) { .plates { gap: 72px; } }

.plate-grid { display: grid; grid-template-columns: repeat(12, 1fr); column-gap: var(--gutter); }

.plate--a .pl-img { grid-column: 1 / -1; }

/* B pairs: one row, equal rendered heights; widths derived from aspect ratios
   in the markup so neither member can collapse or float. */
.plate--b .pl-row { display: flex; gap: 24px; align-items: flex-start; }

.plate--c6 .pl-img { grid-column: 4 / span 6; }
.plate--c7 .pl-img { grid-column: 3 / span 7; }
.plate--c8 .pl-img { grid-column: 3 / span 8; }

@media (max-width: 767px) {
  .plate-grid { display: block; }
  .plate--b .pl-row { display: block; }
  .plate--b .pl-row .pl-img { width: 100% !important; }
  .plate--b .pl-row .pl-img + .pl-img { margin-top: var(--s2); }
  /* C keeps visible extra margin so the size hierarchy survives on iPhone */
  .plate--c6 .pl-img, .plate--c7 .pl-img, .plate--c8 .pl-img,
  .folio.fol-c6, .folio.fol-c7, .folio.fol-c8 { padding-inline: 32px; }
}

/* folio stays attached to its plate: 16px below, aligned to the image's left edge */
.folio { margin-top: var(--s2); color: var(--ink); }
.folio.fol-a  { grid-column: 1 / -1; }
.folio.fol-c6 { grid-column: 4 / span 6; }
.folio.fol-c7 { grid-column: 3 / span 7; }
.folio.fol-c8 { grid-column: 3 / span 8; }

/* image settle — the site's single motion effect */
.pl-img img { opacity: 0; transition: opacity 180ms ease-out; }
.pl-img img.is-visible, .no-js .pl-img img { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  .pl-img img { opacity: 1; transition: none; }
}

/* ============ Project index (Phase 2 §6) ============ */
.pindex { display: grid; grid-template-columns: repeat(12, 1fr); column-gap: var(--gutter); }
.pindex-list { grid-column: 1 / span 7; border-top: 1px solid var(--hairline); }
.pindex-preview {
  grid-column: 9 / span 4;
  position: sticky; top: calc(var(--header-h) + var(--s3));
  align-self: start;
}
.pindex-preview .pv { display: none; }
.pindex-preview .pv.active { display: block; }

.prow { display: block; border-bottom: 1px solid var(--hairline); padding: var(--s3) 0; }
.prow:hover { text-decoration: none; }
.prow .pr-num { display: block; margin-bottom: var(--s1); }
.prow .pr-title { font-size: 28px; font-weight: 500; letter-spacing: -0.01em; line-height: 1.1; }
.prow:hover .pr-title, .prow:focus-visible .pr-title { text-decoration: underline; text-underline-offset: 4px; }
.prow .pr-desc { display: block; margin-top: var(--s1); color: var(--ink); }
.prow .pr-cover { display: none; }

@media (max-width: 767px) {
  .pindex { display: block; }
  .pindex-preview { display: none; }
  /* Cover always visible inline; the whole row is ONE link — one tap opens the project */
  .prow .pr-cover { display: block; margin-bottom: var(--s2); }
}

/* ============ Client marquee (Phase 2 §7) ============ */
.marquee-band {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  display: flex; align-items: center; gap: var(--s3);
  min-height: 48px; overflow: hidden;
}
.marquee-label { flex: 0 0 auto; white-space: nowrap; padding-block: var(--s2); }
.marquee-viewport { flex: 1 1 auto; overflow: hidden; }
.marquee-track {
  display: inline-flex; white-space: nowrap; gap: var(--s3);
  animation: marquee 55s linear infinite;
  will-change: transform;
}
.marquee-track span { padding-block: var(--s2); }
.marquee-band:hover .marquee-track,
.marquee-band:focus-within .marquee-track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (max-width: 767px) {
  .marquee-band { flex-direction: column; align-items: flex-start; gap: 0; }
  .marquee-track { animation-duration: 70s; }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; white-space: normal; display: inline; }
  .marquee-viewport { overflow: visible; }
}

/* ============ Project pages ============ */
.chapter-head { padding: var(--s5) 0 var(--s5); }
.chapter-head .t2 { margin-bottom: var(--s3); }
.chapter-head .desc { margin: var(--s3) 0 0; }
.chapter-head .meta { margin: var(--s2) 0 0; color: var(--ink); }

.chapter-sub { margin: var(--s6) 0 var(--s5); }
.chapter-sub .rule { margin-bottom: var(--s2); }
@media (max-width: 767px) { .chapter-sub { margin: var(--s5) 0; } }

.end-matter { margin-top: var(--s6); }
.end-matter .rule { margin-bottom: var(--s3); }
.end-matter .links { display: flex; justify-content: space-between; gap: var(--s3); padding-bottom: var(--s4); }
.end-matter .t2 { display: block; margin-bottom: var(--s1); }

/* ============ About ============ */
.about-grid { display: grid; grid-template-columns: repeat(12, 1fr); column-gap: var(--gutter); }
.about-grid .bio { grid-column: 1 / span 7; }
.about-grid .contact { grid-column: 9 / span 4; display: flex; flex-direction: column; gap: var(--s1); }
@media (max-width: 767px) {
  .about-grid { display: block; }
  .about-grid .contact { margin-top: var(--s4); }
}