/* AMATERASU theme
   Celestial teal sanctuary. Two-ink structural system: Polar White and Cosmic
   Violet carry all structure; Aurora Teal appears only in the atmospheric hero.
   Palette, type scale, radius, and spacing follow the Amaterasu style spec.
   The spec names TWK Lausanne and Neo Sans Pro, both licensed. This site uses
   Inter, differentiating the three roles by weight, tracking, and case.
   Two deliberate substitutions, both for legibility:
     - muted text uses Storm Shadow, not Silver Slate (3.62:1 fails AA on white)
     - small caps labels sit at 11px, not the 10px caption token */

:root {
  /* palette */
  --cosmic: #1b2978;
  --indigo: #19366c;
  --teal: #75cdd6;
  --white: #ffffff;
  --obsidian: #000000;
  --silver: #7488a5;
  --cerulean: #579dc0;
  --storm: #466187;

  /* roles */
  --paper: var(--white);
  --text: var(--obsidian);
  --heading: var(--cosmic);
  --body: #22262e;
  --muted: var(--storm);
  --line: rgba(116, 136, 165, .34);
  --line-strong: rgba(27, 41, 120, .22);
  --accent: var(--cosmic);

  /* type */
  --font-sans: Inter, "TWK Lausanne", "Helvetica Neue", system-ui, sans-serif;
  --track-display: -0.04em;
  --track-heading: -0.025em;
  --track-label: 0.28em;

  /* type scale, major third from 16px */
  --fs-caption: 11px;
  --fs-body: 16px;
  --fs-subheading: 20px;
  --fs-heading-sm: 26px;
  --fs-heading: 40px;
  --fs-display-sm: 50px;
  --fs-display: 60px;
  --fs-display-lg: 80px;

  /* spacious density */
  --gap-el: 20px;
  --pad-card: 40px;
  --gap-section: 60px;

  --r: 20px;
  --wrap: 1200px;
  --measure: 68ch;
  --pad: clamp(20px, 5vw, 60px);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
picture { display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: var(--cosmic); text-decoration: none; }
a:hover { color: var(--indigo); }
::selection { background: var(--teal); color: var(--cosmic); }
:focus-visible { outline: 2px solid var(--cosmic); outline-offset: 3px; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 20;
  background: var(--cosmic); color: var(--white);
  font-size: var(--fs-caption); text-transform: uppercase; letter-spacing: var(--track-label);
  padding: 14px 20px; border-radius: 0 0 var(--r) 0;
}
.skip-link:focus { left: 0; color: var(--white); }

/* --- type roles --- */
/* all-caps labels: extreme tracking turns tiny text into a spatial marker */
.mono, .kicker, .eyebrow, .meta, .project-meta, .site-nav a, .site-footer {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  font-weight: 500;
}
.kicker, .eyebrow { font-size: var(--fs-caption); line-height: 1.4; color: var(--muted); margin: 0; }
.meta, .project-meta, .site-footer { font-size: var(--fs-caption); line-height: 1.4; color: var(--muted); }
.serif, h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 300;
  letter-spacing: var(--track-heading);
  color: var(--heading);
}
p { line-height: 1.6; color: var(--body); }

/* --- header --- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: var(--gap-el);
  max-width: var(--wrap); margin: 0 auto;
  padding: var(--gap-el) var(--pad); border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .88); backdrop-filter: blur(12px);
}
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 13px; font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase; color: var(--cosmic);
}
.brand:hover { color: var(--indigo); }
.brand em { font-style: normal; color: var(--cerulean); }
.brand-mark {
  width: 18px; height: 18px; flex: none; border-radius: 4px;
  background: url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%2032%2032%22%3E%3Cdefs%3E%3CclipPath%20id%3D%22c%22%3E%3Crect%20width%3D%2232%22%20height%3D%2232%22%20rx%3D%227%22%2F%3E%3C%2FclipPath%3E%3C%2Fdefs%3E%3Crect%20width%3D%2232%22%20height%3D%2232%22%20rx%3D%227%22%20fill%3D%22%231b2978%22%2F%3E%3Cg%20clip-path%3D%22url%28%23c%29%22%20fill%3D%22none%22%20stroke%3D%22%2375cdd6%22%20stroke-width%3D%221.55%22%3E%3Cpath%20d%3D%22M-2%2010.5C6%207%2026%207%2034%2010.5M-2%2016C6%2012.5%2026%2012.5%2034%2016M-2%2021.5C6%2018%2026%2018%2034%2021.5M-2%2027C6%2023.5%2026%2023.5%2034%2027M8.5-2C6%206%206%2026%208.5%2034M16-2C15%206%2015%2026%2016%2034M23.5-2C26%206%2026%2026%2023.5%2034%22%2F%3E%3C%2Fg%3E%3Ccircle%20cx%3D%2215.6%22%20cy%3D%2216%22%20r%3D%223.7%22%20fill%3D%22%231b2978%22%2F%3E%3Ccircle%20cx%3D%2215.6%22%20cy%3D%2216%22%20r%3D%222.5%22%20fill%3D%22%23ffffff%22%2F%3E%3C%2Fsvg%3E") center / contain no-repeat;
}

.site-nav { display: flex; gap: 28px; font-size: var(--fs-caption); }
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--cosmic); }
.site-nav a[aria-current="page"] { color: var(--cosmic); }

.nav-toggle {
  display: none; width: 44px; height: 44px; margin-right: -10px;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  padding: 0; border: 0; background: none; cursor: pointer; border-radius: var(--r);
}
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: var(--cosmic); transition: transform .2s, opacity .2s; }

/* --- homepage sections --- */
.wrap > section { padding: clamp(50px, 7vw, 60px) 0; border-top: 0; }

/* the hero is the only painted moment: teal lives here and nowhere else */
#top {
  position: relative; isolation: isolate; overflow: hidden;
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(48px, 8vw, 96px) clamp(28px, 5vw, 64px) clamp(44px, 6vw, 72px);
  border-radius: var(--r);
  background:
    radial-gradient(120% 90% at 82% 8%, rgba(117, 205, 214, .42) 0%, rgba(117, 205, 214, 0) 58%),
    radial-gradient(90% 70% at 12% 92%, rgba(87, 157, 192, .34) 0%, rgba(87, 157, 192, 0) 62%),
    linear-gradient(207deg, #1b2978 8%, #19366c 54%, #12204f 100%);
}
#top h1 {
  font-size: clamp(2.6rem, 6.6vw, 5rem); line-height: 1.02;
  font-weight: 300; letter-spacing: var(--track-display);
  color: var(--white); margin: 0; max-width: 17ch;
}
#top .kicker { margin-bottom: 28px; color: var(--teal); }
#top .cols p { font-size: var(--fs-subheading); line-height: 1.5; margin: 0; max-width: 46ch; color: rgba(255, 255, 255, .82); }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 5vw, 60px); }
#top .cols { margin-top: clamp(32px, 5vw, 48px); align-items: end; }

dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap-el); margin: 0; }
dt { font-size: var(--fs-caption); line-height: 1.4; text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; color: var(--teal); }
dd { margin: 10px 0 0; font-size: var(--fs-heading-sm); line-height: 1.1; font-weight: 300; letter-spacing: var(--track-heading); color: var(--white); }

.head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--gap-el); margin-bottom: 32px; }
.head a { font-size: var(--fs-caption); text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; }

/* --- homepage cards --- */
.card { color: inherit; display: block; }
.card img {
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--white); object-fit: contain; width: 100%; height: auto;
}
.card h3 { margin: 0 0 10px; line-height: 1.15; font-size: var(--fs-heading-sm); }
.card p { margin: 0 0 10px; }
.card:hover h3 { color: var(--indigo); }
.card:hover img { border-color: var(--line-strong); }

.feature { margin-bottom: 28px; }
.feature img { aspect-ratio: 21/9; }
.feature .cols { padding: var(--gap-el) 0 28px; }
.feature h3 { font-size: clamp(1.9rem, 4vw, 2.5rem); line-height: 1.1; letter-spacing: var(--track-heading); }

.pair { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(20px, 4vw, 40px); }
.pair img { aspect-ratio: 4/3; margin-bottom: var(--gap-el); }

.strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--gap-el); margin-top: clamp(28px, 4vw, 40px); }
.strip img { aspect-ratio: 3/4; border-radius: var(--r); }
.strip p { margin: 12px 0 0; font-size: var(--fs-caption); line-height: 1.4; color: var(--muted); }

/* --- homepage about --- */
#about .lede { font-size: clamp(1.75rem, 3.4vw, 3.125rem); line-height: 1.1; font-weight: 300; letter-spacing: var(--track-display); margin: 0; color: var(--cosmic); text-wrap: pretty; }
#about .kicker { margin-bottom: var(--gap-el); }
#about p { margin: 0 0 18px; max-width: 52ch; }
.facts {
  display: grid; gap: 12px; margin-bottom: 28px;
  font-size: var(--fs-caption); line-height: 1.4;
  text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; color: var(--muted);
}
.facts li { border-top: 1px solid var(--line); padding-top: 12px; }

/* hairline outlined pills, never filled blocks */
.btns { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 26px;
  font-size: var(--fs-caption); text-transform: uppercase; letter-spacing: var(--track-label);
  font-weight: 500; border-radius: var(--r);
  border: 1px solid var(--line); background: transparent; color: var(--muted);
  transition: border-color .18s, color .18s;
}
.btn:hover { border-color: var(--cosmic); background: transparent; color: var(--cosmic); }
.btn-accent { border-color: var(--cosmic); color: var(--cosmic); }
.btn-accent:hover { border-color: var(--indigo); color: var(--indigo); }

/* --- interior pages --- */
.page { max-width: var(--wrap); margin: 0 auto; padding: clamp(48px, 7vw, 80px) var(--pad) clamp(60px, 9vw, 104px); }

.page-heading { max-width: var(--measure); margin-bottom: clamp(40px, 6vw, 60px); }
.page-heading .eyebrow { margin-bottom: var(--gap-el); }
.page-heading h1 { font-size: clamp(2.5rem, 6vw, 3.75rem); line-height: 1.05; font-weight: 300; letter-spacing: var(--track-display); margin: 0 0 22px; }
.page-heading p:not(.eyebrow) { font-size: var(--fs-subheading); line-height: 1.5; margin: 0; max-width: 50ch; color: var(--muted); text-wrap: pretty; }

.section-heading { max-width: var(--measure); padding-top: clamp(48px, 6vw, 60px); border-top: 0; margin-bottom: clamp(32px, 5vw, 48px); }
.section-heading .eyebrow { margin-bottom: 18px; }
.section-heading h2 { font-size: clamp(2rem, 4.4vw, 2.5rem); line-height: 1.1; font-weight: 300; letter-spacing: var(--track-display); margin: 0 0 var(--gap-el); }
.section-heading p { margin: 0; max-width: 52ch; color: var(--muted); text-wrap: pretty; }
.project-stack-heading { margin-top: clamp(56px, 8vw, 96px); }

/* --- project cards --- */
.project-stack { display: grid; gap: clamp(40px, 5vw, 60px); }
.project-feature {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(24px, 4vw, 48px); align-items: center;
  padding-bottom: 0; border-bottom: 0;
}
.project-feature-image { display: block; }
.project-feature-image img {
  width: 100%; height: auto; border: 1px solid var(--line);
  border-radius: var(--r); background: var(--white); object-fit: contain;
}
.project-feature-image:hover img { border-color: var(--line-strong); }
.project-meta { margin: 0 0 var(--gap-el); letter-spacing: .16em; }
.project-feature h2 { font-size: clamp(1.75rem, 2.9vw, 2.25rem); line-height: 1.1; font-weight: 300; letter-spacing: var(--track-heading); margin: 0 0 14px; }
.project-feature > div > p { margin: 0 0 var(--gap-el); max-width: 52ch; text-wrap: pretty; }
.project-feature { scroll-margin-top: 96px; }
.wrap > section { scroll-margin-top: 96px; }
.project-action { margin: 0 !important; font-size: var(--fs-body); text-transform: none; letter-spacing: 0; font-weight: 400; }
.project-action a { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.project-action a { color: var(--cosmic); }
.project-action a:hover { color: var(--indigo); }

/* --- map challenge gallery --- */
.map-grid {
  display: grid; align-items: start;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: clamp(28px, 3vw, 40px);
}
.map-card { display: block; color: inherit; scroll-margin-top: 96px; }
.map-card img {
  width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; padding: 20px;
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--white); margin-bottom: var(--gap-el);
}
.map-card:hover img { border-color: var(--line-strong); }
.map-card .project-meta,
.card .project-meta { letter-spacing: .16em; }
.map-card .project-meta { margin: 0 0 10px; min-height: 2.8em; }
.map-card h3 { font-size: var(--fs-subheading); line-height: 1.2; margin: 0 0 10px; }
.map-card:hover h3 { color: var(--indigo); }
.map-card p:last-child { margin: 0; font-size: var(--fs-body); line-height: 1.55; }

.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.tag-row span {
  font-size: var(--fs-caption); line-height: 1.4;
  text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500;
  color: var(--cosmic); border: 1px solid var(--line-strong); border-radius: var(--r);
  padding: 7px 16px; background: transparent;
}

/* --- reading pages: narrower canvas, centred text column --- */
.about-page { max-width: 960px; }
.post-page > .post-article > *,
.about-page > .page-heading, .about-page > .prose {
  margin-inline: auto;
}

/* --- post pages --- */
.post-page { max-width: 960px; margin: 0 auto; padding: clamp(40px, 6vw, 72px) var(--pad) clamp(60px, 9vw, 104px); }
.post-header { max-width: var(--measure); margin-bottom: clamp(32px, 5vw, 48px); }
.post-header .eyebrow { margin-bottom: var(--gap-el); }
.post-header h1 { font-size: clamp(2.4rem, 5.6vw, 3.75rem); line-height: 1.05; font-weight: 300; letter-spacing: var(--track-display); margin: 0 0 22px; }
.post-deck { font-size: var(--fs-subheading); line-height: 1.5; margin: 0; max-width: 50ch; color: var(--muted); text-wrap: pretty; }

.post-meta-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: var(--gap-el) 28px; margin-top: clamp(28px, 4vw, 40px);
  padding-top: 28px; border-top: 1px solid var(--line);
}
.post-meta-grid span {
  display: block; margin-bottom: 8px;
  font-size: var(--fs-caption); line-height: 1.4;
  text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; color: var(--muted);
}
.post-meta-grid strong { display: block; font-weight: 400; font-size: var(--fs-body); line-height: 1.45; color: var(--cosmic); }

.post-hero-image { margin: 0 0 clamp(32px, 5vw, 48px); }
.post-hero-image img {
  width: 100%; height: auto; margin: 0 auto;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--white);
}
.post-hero-image figcaption { margin-top: 14px; font-size: var(--fs-caption); line-height: 1.6; letter-spacing: .04em; color: var(--muted); max-width: var(--measure); }

.post-content { max-width: var(--measure); }
.post-content h2 { font-size: var(--fs-heading-sm); line-height: 1.2; font-weight: 300; letter-spacing: var(--track-heading); margin: clamp(40px, 5vw, 56px) 0 var(--gap-el); }
.post-content p { margin: 0 0 20px; font-size: var(--fs-body); line-height: 1.7; text-wrap: pretty; }
.post-content a { color: var(--cosmic); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.post-content ul { display: grid; gap: 12px; margin: 0 0 24px; }
.post-content li { padding-left: 22px; position: relative; line-height: 1.6; color: var(--body); }
.post-content li::before { content: ""; position: absolute; left: 0; top: .72em; width: 10px; height: 1px; background: var(--cerulean); }
.post-content code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .88em;
  background: transparent; border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px;
}
.post-content table {
  width: 100%; border-collapse: collapse; margin: 0 0 20px;
  font-size: var(--fs-body); line-height: 1.45;
}
.post-content caption {
  text-align: left; color: var(--muted); font-size: var(--fs-caption);
  text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; padding-bottom: 14px;
}
.post-content th, .post-content td {
  text-align: left; padding: 12px 14px 12px 0; border-bottom: 1px solid var(--line);
}
.post-content thead th {
  font-size: var(--fs-caption); line-height: 1.4;
  text-transform: uppercase; letter-spacing: var(--track-label); color: var(--muted); font-weight: 500;
}
.post-content td:last-child, .post-content th:last-child {
  text-align: right; padding-right: 0; font-variant-numeric: tabular-nums;
}

.source-note {
  margin-top: clamp(32px, 4vw, 44px) !important; padding-top: 20px;
  border-top: 1px solid var(--line); font-size: var(--fs-caption) !important;
  line-height: 1.6; letter-spacing: .04em; color: var(--muted);
}

/* --- prose (about) --- */
.prose { max-width: var(--measure); }
.prose h2 { font-size: var(--fs-heading-sm); line-height: 1.2; font-weight: 300; letter-spacing: var(--track-heading); margin: clamp(40px, 5vw, 56px) 0 var(--gap-el); }
.prose p { margin: 0 0 20px; font-size: var(--fs-body); line-height: 1.7; text-wrap: pretty; }
.prose a { color: var(--cosmic); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.prose ul { display: grid; gap: 12px; margin: 0 0 24px; }
.prose li { padding-left: 22px; position: relative; line-height: 1.6; color: var(--body); }
/* prose tables reuse the post-content treatment */
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 20px; font-size: var(--fs-body); line-height: 1.45; }
.prose caption { text-align: left; color: var(--muted); font-size: var(--fs-caption); text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500; padding-bottom: 14px; }
.prose th, .prose td { text-align: left; padding: 12px 14px 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose thead th { font-size: var(--fs-caption); line-height: 1.4; text-transform: uppercase; letter-spacing: var(--track-label); color: var(--muted); font-weight: 500; }
.prose h3 { font-size: var(--fs-subheading); line-height: 1.25; font-weight: 400; letter-spacing: var(--track-heading); margin: clamp(28px, 3vw, 36px) 0 6px; }
.prose h3 + .meta { margin: 0 0 12px; }
.prose .meta { color: var(--muted); }

/* progressive disclosure for the long course list; no script needed */
.prose details { margin: 0 0 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 4px 0; }
.prose summary {
  cursor: pointer; padding: 16px 0; list-style: none;
  font-size: var(--fs-caption); text-transform: uppercase;
  letter-spacing: var(--track-label); font-weight: 500; color: var(--cosmic);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.prose summary::-webkit-details-marker { display: none; }
.prose summary::after { content: "+"; font-size: 18px; line-height: 1; letter-spacing: 0; }
.prose details[open] summary::after { content: "\2013"; }
.prose summary:hover { color: var(--indigo); }
.prose summary:focus-visible { outline: 2px solid var(--cosmic); outline-offset: 3px; }
.prose details > *:last-child { margin-bottom: 20px; }

.prose li::before { content: ""; position: absolute; left: 0; top: .72em; width: 10px; height: 1px; background: var(--cerulean); }

/* --- 404 --- */
.not-found { min-height: 52vh; display: grid; align-content: center; justify-items: start; }
.not-found h1 { font-size: clamp(2.5rem, 6.6vw, 3.75rem); line-height: 1.05; font-weight: 300; letter-spacing: var(--track-display); margin: 18px 0 18px; }
.not-found p { margin: 0 0 28px; }

/* --- footer --- */
.site-footer {
  display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: baseline;
  max-width: var(--wrap); margin: 0 auto;
  padding: 28px var(--pad) 52px; border-top: 1px solid var(--line);
  color: var(--muted);
}
.site-footer p { margin: 0; font-size: inherit; line-height: inherit; color: inherit; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--cosmic); }

.footer-right { display: flex; align-items: center; gap: 20px; }
.social-links { display: flex; align-items: center; gap: 14px; }
.social-links a { color: var(--muted); display: inline-flex; }
.social-links a:hover { color: var(--cosmic); }
.social-links svg { width: 16px; height: 16px; display: block; }

/* --- post gallery (slide decks) --- */
.post-gallery { margin: clamp(32px, 5vw, 48px) 0; }
.post-gallery-intro { max-width: var(--measure); margin: 0 0 clamp(20px, 3vw, 28px); }
.post-gallery-intro h2 { font-size: var(--fs-heading-sm); line-height: 1.2; font-weight: 300; letter-spacing: var(--track-heading); margin: 0 0 12px; }
.post-gallery-intro p { margin: 0; font-size: var(--fs-body); line-height: 1.7; color: var(--body); text-wrap: pretty; }
.post-gallery-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap-el); }
.post-gallery figure { margin: 0; }
.post-gallery img {
  width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: contain;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--white);
}
.post-gallery figcaption { margin-top: 10px; font-size: var(--fs-caption); line-height: 1.5; letter-spacing: .04em; color: var(--muted); }
@media (max-width: 640px) { .post-gallery-grid { grid-template-columns: minmax(0, 1fr); } }

/* --- expandable image lightbox --- */
.zoomable { cursor: zoom-in; }
body.lightbox-open { overflow: hidden; }
.lightbox {
  position: fixed; inset: 0; z-index: 50;
  display: none; align-items: center; justify-content: center;
  padding: clamp(16px, 4vw, 52px);
  background: rgba(18, 32, 79, .95);
}
.lightbox[aria-hidden="false"] { display: flex; }
.lightbox-figure {
  margin: 0; max-width: 100%; max-height: 100%;
  display: flex; flex-direction: column; align-items: center;
}
.lightbox-figure img {
  max-width: 100%; max-height: 86vh; width: auto; height: auto;
  object-fit: contain; cursor: zoom-out;
  border: 0; border-radius: var(--r); background: var(--white);
}
.lightbox-caption {
  margin-top: 18px; max-width: 68ch;
  font-size: var(--fs-caption); line-height: 1.6;
  text-transform: uppercase; letter-spacing: var(--track-label); font-weight: 500;
  text-align: center; color: var(--teal);
}
.lightbox-caption[hidden] { display: none; }
.lightbox-close {
  position: absolute; top: clamp(10px, 2vw, 22px); right: clamp(10px, 2vw, 22px);
  width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  padding: 0; border: 1px solid rgba(255, 255, 255, .38); border-radius: var(--r);
  background: transparent; color: var(--white); font-size: 26px; line-height: 1; cursor: pointer;
}
.lightbox-close:hover { border-color: var(--teal); background: transparent; color: var(--teal); }
.lightbox-close:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; }

@media (prefers-reduced-motion: no-preference) {
  .lightbox[aria-hidden="false"] .lightbox-figure { animation: lightbox-in .18s ease-out; }
}
@keyframes lightbox-in { from { opacity: 0; transform: scale(.985); } to { opacity: 1; transform: none; } }

@media (max-width: 860px) {
  .project-feature { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .project-feature-image { order: -1; }
}

@media (max-width: 720px) {
  :root { --track-label: 0.2em; }
  .nav-toggle { display: flex; }
  .site-header { flex-wrap: wrap; padding-top: 16px; padding-bottom: 16px; }
  .site-nav {
    display: none; flex-basis: 100%; flex-direction: column; gap: 0;
    margin: 0 -4px; padding-top: 8px;
  }
  body.nav-open .site-nav { display: flex; }
  .site-nav a { padding: 14px 4px; border-top: 1px solid var(--line); }
  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

  .cols, .pair { grid-template-columns: 1fr; }
  dl { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
  dd { font-size: var(--fs-subheading); }
  .post-meta-grid { grid-template-columns: minmax(0, 1fr); gap: 20px; }
}