/* vrlab.com — component CSS on design-system tokens (/css/tokens.css, generated). Paper and ink, square corners,
   hairlines not shadows, brass and signal rationed. The signature element is the evidence frame: an archival
   duotone photograph with a brass corner tick and its Slate (style guide §6–§7). */

/* ---------- base ---------- */
.site { min-height: 100vh; display: flex; flex-direction: column; background: var(--paper-000); color: var(--ink); font-family: var(--font-sans); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.stack { display: flex; flex-direction: column; gap: 16px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper-000); padding: 8px 12px; }
.skip:focus { left: 8px; z-index: 10; }
img { max-width: 100%; height: auto; }

a { color: var(--link); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }                       /* not opacity: dimming drops link contrast below 4.5:1 */
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }

/* ---------- type ---------- */
h1, h2, h3, .h3 { font-family: var(--font-serif); font-weight: 600; margin: 0; letter-spacing: -0.005em; }
.display { font-size: clamp(40px, 5.4vw, 64px); line-height: 1.04; letter-spacing: -0.015em; }
h1 { font-size: clamp(32px, 4vw, 44px); line-height: 1.1; }
h2 { font-size: clamp(24px, 2.6vw, 30px); line-height: 1.18; }
h3, .h3 { font-size: 21px; line-height: 1.3; }
h3 a { color: var(--ink); }
.lede { font-size: 20px; line-height: 31px; max-width: 34em; margin: 0; }
.body { font-size: 17px; line-height: 27px; margin: 0; max-width: 40em; }
.small { font-size: 15px; line-height: 23px; margin: 0; }
.muted { color: var(--ink-muted); }
.label { font: 500 14px/18px var(--font-sans); letter-spacing: .01em; }
a.label { display: inline-flex; align-items: center; gap: .4em; min-height: 40px; }
.mono-13 { font-family: var(--font-mono); font-size: 13px; }
.prose > * + * { margin-top: 16px; }
.prose ul { padding-left: 20px; margin: 0; }
.prose li + li { margin-top: 6px; }
.prose h2 { margin-top: 32px; }
ul.plain { list-style: none; margin: 0; padding: 0; }
ul.plain li { font-size: 15px; line-height: 24px; }

/* ---------- header ---------- */
.site-header { border-bottom: 1px solid var(--hairline); }
.site-header .row { min-height: 88px; }
.brand { display: inline-flex; text-decoration: none; }
.brand img { height: 52px; width: auto; display: block; }
.brand img.only-ink { display: none; }
[data-theme="ink"] .brand img.only-paper { display: none; }
[data-theme="ink"] .brand img.only-ink { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="paper"]) .brand img.only-paper { display: none; }
  :root:not([data-theme="paper"]) .brand img.only-ink { display: block; }
}
.nav { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--ink); text-decoration: underline; text-underline-offset: 6px; }
.nav a[aria-current="page"] { text-decoration-thickness: 2px; text-decoration-color: var(--brass); }
.theme-toggle { background: transparent; border: 0; cursor: pointer; padding: 8px 0; min-height: 40px; }
nav a { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; min-width: 40px; }   /* 40×40 targets (spec §5.8) */

/* ---------- slate ---------- */
.slate { font-family: var(--font-mono); font-size: 12px; line-height: 17px; letter-spacing: .04em; color: var(--brass-text); display: inline-flex; flex-wrap: wrap; align-items: center; column-gap: .7ch; row-gap: 2px; }
.slate .sl { white-space: nowrap; }                      /* a Slate wraps between segments, never inside one */
.slate .dot, .slate .cursor { margin-right: 2px; }
.slate-h { margin: 0; font: inherit; letter-spacing: inherit; }
.d { font-family: var(--font-mono); font-size: .95em; letter-spacing: 0; line-height: 0; }   /* numerals of record inside prose (style guide §4) */
.slate.on-ink { color: var(--brass); }
.slate.on-ink a { color: inherit; }
.slate .dot { width: 6px; height: 6px; border-radius: var(--radius-pill); background: var(--signal); display: inline-block; }
.cursor { display: inline-block; width: 8px; height: 14px; background: var(--signal); vertical-align: -2px; animation: vr-blink 1s steps(1) infinite; }
@keyframes vr-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; } }

/* ---------- buttons ---------- */
.btn { font: 500 15px/18px var(--font-sans); letter-spacing: .01em; padding: 12px 18px; min-height: 44px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper-000); text-decoration: none; display: inline-flex; align-items: center; gap: 8px; box-sizing: border-box; border-radius: var(--radius-0); }
.btn.secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn:hover { text-decoration: underline; text-underline-offset: 3px; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ---------- sections ---------- */
section { padding: 80px 0; border-top: 1px solid var(--hairline); }
section.first { border-top: 0; padding-top: 72px; }
.section-head { display: flex; flex-direction: column; gap: 14px; max-width: 46em; }
.section-body { display: flex; flex-direction: column; gap: 40px; }

/* ---------- the evidence frame (signature) ---------- */
figure.evidence { margin: 0; display: flex; flex-direction: column; gap: 10px; }
.evidence .frame { position: relative; display: block; border: 1px solid var(--hairline); background: var(--paper-200); line-height: 0; }
.evidence .frame::before { content: ""; position: absolute; top: -1px; left: -1px; width: 12px; height: 12px; background: var(--brass); z-index: 1; }
.evidence .frame img { display: block; width: 100%; height: auto; }
.evidence figcaption { display: flex; flex-direction: column; gap: 4px; }
.evidence .cap { font-size: 14px; line-height: 21px; color: var(--ink-muted); max-width: 38em; }
.evidence .cap strong { color: var(--ink); font-weight: 600; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: 5fr 7fr; gap: 56px; align-items: start; }
.hero-text { display: flex; flex-direction: column; gap: 22px; padding-top: 8px; }
.diptych { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: start; }
.diptych .pin-2 { margin-top: 72px; }
.docket { list-style: none; margin: 56px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.docket li + li { border-left: 1px solid var(--hairline); }
.docket a { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px; text-decoration: none; color: var(--ink); min-height: 40px; }
.docket .k { text-decoration: underline; text-underline-offset: 3px; }
.docket a:hover .k { text-decoration-thickness: 2px; }
.docket .n { font-family: var(--font-mono); font-weight: 700; font-size: 30px; line-height: 34px; }
.docket .k { font-size: 14px; line-height: 20px; color: var(--ink-muted); }

/* ---------- capabilities and case files ---------- */
.capabilities { display: flex; flex-direction: column; }
.capability { display: grid; grid-template-columns: 4fr 8fr; gap: 40px; padding: 32px 0; border-top: 1px solid var(--hairline); align-items: start; }
.capability:last-child { border-bottom: 1px solid var(--hairline); }
.cap-text { display: flex; flex-direction: column; gap: 10px; }
.case { display: grid; grid-template-columns: 5fr 7fr; gap: 24px; align-items: start; align-content: start; }
.case-large { grid-template-columns: 7fr 5fr; }
.case.case-text { grid-template-columns: 1fr; border-left: 2px solid var(--brass); padding-left: 20px; }   /* outranks .case-large: a text-only case file has one column */
.case-body { display: flex; flex-direction: column; gap: 8px; }
.case .credit { margin-top: 2px; }
.project-list { display: flex; flex-direction: column; gap: 48px; }
.project-list .case { padding-bottom: 48px; border-bottom: 1px solid var(--hairline); }
.featured-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 32px; align-items: start; }
.featured-grid .case { grid-template-columns: 1fr; }
.featured-grid .case-large { grid-column: 1 / -1; grid-template-columns: 7fr 5fr; }

/* ---------- the record strip (homepage) ---------- */
.record-section .strip-wrap { overflow-x: auto; scroll-snap-type: x proximity; scroll-padding-inline: max(24px, calc((100vw - 1120px) / 2 + 24px)); padding: 8px 0 16px; scrollbar-width: thin; scrollbar-color: var(--hairline) transparent; }
.strip { list-style: none; margin: 0; display: flex; gap: 20px; padding: 0 24px 0 max(24px, calc((100vw - 1120px) / 2 + 24px)); width: max-content; }
.frame-item { width: 240px; scroll-snap-align: start; }
.frame-item a { display: flex; flex-direction: column; gap: 10px; color: var(--ink); text-decoration: none; }
.frame-item .frame { display: block; position: relative; aspect-ratio: 4 / 3; border: 1px solid var(--hairline); background: var(--paper-200); overflow: hidden; }
.frame-item .frame::before { content: ""; position: absolute; top: -1px; left: -1px; width: 10px; height: 10px; background: var(--brass); z-index: 1; }
.frame-item .frame img { width: 100%; height: 100%; object-fit: cover; display: block; }
/* a frame with no photograph is a slate card: ink ground, the date in brass (the same in both themes) */
.frame-item .frame-date { display: flex; flex-direction: column; justify-content: space-between; padding: 16px; box-sizing: border-box; background: #0b0b0c; border-color: #0b0b0c; }
.frame-item .frame-date .fd { font-family: var(--font-mono); font-weight: 700; font-size: 24px; line-height: 28px; color: #c9a227; }
.frame-item .frame-date .fw { font-family: var(--font-mono); font-size: 12px; line-height: 16px; letter-spacing: .04em; color: #f3eee3; }
.frame-what { font-size: 15px; line-height: 22px; text-decoration: underline; text-underline-offset: 3px; }
.frame-item a:hover .frame-what { text-decoration-thickness: 2px; }
.strip-more { margin: 28px 0 0; }

/* ---------- community, now, lab ---------- */
.community-block { display: grid; grid-template-columns: 5fr 7fr; gap: 56px; align-items: start; }
.now-section { background: var(--paper-100); }
.now { display: flex; flex-direction: column; gap: 14px; border-left: 2px solid var(--brass); padding-left: 24px; max-width: 46em; }
.lab-blocks { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--hairline); }
.lab-block { display: flex; flex-direction: column; gap: 12px; padding: 20px 20px 4px 0; }
.lab-block + .lab-block { border-left: 1px solid var(--hairline); padding-left: 20px; }
.cap-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px; }
.cap-list li { display: flex; flex-direction: column; gap: 8px; padding: 24px 0; border-top: 1px solid var(--hairline); }

/* ---------- project pages ---------- */
.project-head { display: grid; grid-template-columns: 6fr 6fr; gap: 56px; align-items: start; }
.status { background: var(--paper-200); padding: 8px 12px; border-radius: var(--radius-sm); margin: 0; align-self: flex-start; }
.two-col { display: grid; grid-template-columns: 7fr 4fr; gap: 56px; align-items: start; }
.facts { display: flex; flex-direction: column; gap: 20px; border-top: 2px solid var(--brass); padding-top: 16px; }
.fact { display: flex; flex-direction: column; gap: 6px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 32px 24px; align-items: start; }
.gallery .evidence .frame { aspect-ratio: 4 / 3; overflow: hidden; }
.gallery .evidence .frame img { height: 100%; object-fit: cover; }

/* ---------- register and record ---------- */
.register, .record { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--hairline); }
.reg-item { display: grid; grid-template-columns: 200px 1fr 140px; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--hairline); align-items: start; }
.reg-body { display: flex; flex-direction: column; gap: 6px; }
.reg-thumb img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border: 1px solid var(--hairline); }
.year-block { display: flex; flex-direction: column; gap: 12px; }
.year { font-family: var(--font-mono); font-weight: 700; font-size: 30px; line-height: 34px; letter-spacing: 0; }
.era-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-family: var(--font-mono); }
.record-item { display: grid; grid-template-columns: 220px 1fr 112px; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--hairline); align-items: start; scroll-margin-top: 24px; }
.record-item:target { background: var(--paper-100); box-shadow: -12px 0 0 var(--paper-100), 12px 0 0 var(--paper-100); }
.ri-body { display: flex; flex-direction: column; gap: 4px; }
.ri-body h3 { font-size: 18px; line-height: 26px; }
.ri-thumb { display: block; min-height: 40px; }
.ri-thumb img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border: 1px solid var(--hairline); }
.record.compact .record-item { grid-template-columns: 220px 1fr; }
.nav-404 { display: flex; flex-wrap: wrap; gap: 4px 20px; }

/* ---------- footer ---------- */
.site-footer { margin-top: auto; background: #0b0b0c; color: #f3eee3; padding: 56px 0; }
.site-footer a { color: #f3eee3; }
.footer-grid { display: grid; grid-template-columns: 1fr auto auto; gap: 32px; align-items: end; }
.footer-grid img { height: 52px; width: auto; }
.footer-grid .stack { align-items: flex-start; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }


/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero, .community-block, .project-head, .two-col, .capability, .case, .case-large, .featured-grid, .featured-grid .case-large, .footer-grid { grid-template-columns: 1fr; }
  .hero { gap: 40px; }
  .diptych .pin-2 { margin-top: 40px; }
  .docket { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .docket li:nth-child(3) { border-left: 0; }
  .docket li:nth-child(n+3) { border-top: 1px solid var(--hairline); }
  .lab-blocks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lab-block:nth-child(3) { border-left: 0; padding-left: 0; }
  .cap-list { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  section { padding: 56px 0; }
  section.first { padding-top: 40px; }
  .site-header .row { flex-direction: column; align-items: flex-start; gap: 4px; padding: 12px 0 4px; min-height: 0; }
  .brand img { height: 52px; }
  .nav { flex-wrap: nowrap; overflow-x: auto; width: 100%; gap: 18px; scrollbar-width: none; }
  .nav a, .theme-toggle { flex: 0 0 auto; }
  .diptych { gap: 12px; }
  .diptych .pin-2 { margin-top: 32px; }
  .record-section .strip-wrap { overflow: visible; }
  .strip { flex-direction: column; width: auto; padding: 0 16px; gap: 0; border-top: 1px solid var(--hairline); }
  .frame-item { width: auto; border-bottom: 1px solid var(--hairline); padding: 14px 0; }
  .frame-item a { display: grid; grid-template-columns: 96px 1fr; grid-template-rows: auto auto; gap: 4px 14px; }
  .frame-item .frame { grid-row: 1 / 3; }
  .frame-item .frame-date { font-size: 14px; line-height: 18px; padding: 8px; }
  .reg-item, .record-item { grid-template-columns: 1fr; gap: 8px; }
  .reg-thumb, .ri-thumb { max-width: 220px; }
  .lab-blocks { grid-template-columns: 1fr; }
  .lab-block + .lab-block { border-left: 0; padding-left: 0; border-top: 1px solid var(--hairline); }
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }