/* AIRIA Systems — institutional site
   Notable departures from the initial design source:
   - Single accent (civic navy). The 4-accent picker is dropped.
   - Single rhythm. The density toggle is dropped.
   - The Tweaks panel is dropped; theme toggle lives in the topbar.
   - :focus-visible outlines added per the original a11y checklist.
   - Language switching is server-side (URL routes), not CSS-driven.
*/

:root {
  /* Surfaces — warm paper */
  --paper:        #f3f1ec;
  --paper-2:      #ebe7df;
  --paper-3:      #e2ddd1;
  --rule:         #d8d4ca;
  --rule-2:       #c7c2b6;

  /* Ink */
  --ink:          #16161a;
  --ink-2:        #3b3833;
  --muted:        #7a766d;
  --muted-2:      #a09b90;

  /* Accent — civic navy. Used sparingly: links, solution chip on hover,
     em-highlight in hero and mission, focus rings. */
  --ox:           oklch(0.34 0.090 255);
  --ox-soft:      oklch(0.93 0.025 255);

  /* Type stack */
  --f-sans:       "Helvetica Neue", Helvetica, Arial, sans-serif;
  --f-mono:       ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Rhythm */
  --max:          1320px;
  --pad-x:        clamp(24px, 5vw, 80px);
  --section-y:    clamp(72px, 9vw, 140px);
  --gap:          clamp(20px, 2.5vw, 32px);
}

[data-theme="dark"] {
  --paper:   #0e0e10;
  --paper-2: #16161a;
  --paper-3: #1d1d22;
  --rule:    #2a2a30;
  --rule-2:  #393940;
  --ink:     #f3f1ec;
  --ink-2:   #d8d4ca;
  --muted:   #8c8880;
  --muted-2: #5e5a52;
  --ox:      oklch(0.72 0.110 255);
  --ox-soft: oklch(0.26 0.040 255);
}

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

body {
  font-family: var(--f-sans);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "kern" 1;
  text-rendering: optimizeLegibility;
}

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

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

:focus-visible {
  outline: 2px solid var(--ox);
  outline-offset: 2px;
}

/* ─── Layout primitives ─────────────────────────────────────────── */

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

.section {
  padding-top: var(--section-y);
  padding-bottom: var(--section-y);
  border-top: 1px solid var(--rule);
}
.section.first { border-top: 0; }
.section.tint  { background: var(--paper-2); }
.section.deep  { background: var(--ink); color: var(--paper); }
.section.deep  .eyebrow { color: var(--muted-2); }
.section.deep  .rule    { background: var(--rule-2); opacity: .25; }

/* ─── Type ──────────────────────────────────────────────────────── */

.eyebrow {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 24px; height: 1px;
  background: currentColor;
  opacity: .6;
}

.display {
  font-size: clamp(40px, 6.2vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  font-weight: 500;
  margin: 0;
  text-wrap: balance;
}
.display em { font-style: normal; color: var(--ox); }

.h1 {
  font-size: clamp(32px, 4.6vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 500;
  margin: 0 0 12px;
  text-wrap: balance;
}

.h2 {
  font-size: clamp(24px, 2.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  font-weight: 500;
  margin: 0 0 12px;
  text-wrap: balance;
}

.h3 {
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: -0.005em;
  font-weight: 500;
  margin: 0 0 8px;
}

.lead {
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.45;
  color: var(--ink-2);
  max-width: 62ch;
  text-wrap: pretty;
}

p { margin: 0 0 1em; text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

.meta {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.rule {
  height: 1px;
  background: var(--rule);
  border: 0;
  margin: 0;
}

/* ─── Top nav ───────────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--paper) 90%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 64px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
}

/* The collapse wrapper is transparent on desktop — its children (.nav, .topbar-right)
   participate directly in .topbar-inner's grid. On mobile (≤880px), it becomes a
   drop-down panel anchored below the topbar (see media query at the bottom). */
.topbar-collapse {
  display: contents;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.brand img { height: 28px; width: auto; }

/* Theme-aware logo swap. Both <img>s are stamped; CSS shows one.
   Class names describe the mark colour: .logo-ink = dark mark (used on
   the light/paper theme); .logo-paper = light mark (used on the dark/ink theme). */
.logo-swap { display: inline-flex; align-items: center; }
.logo-swap > .logo-ink   { display: block; }
.logo-swap > .logo-paper { display: none; }
[data-theme="dark"] .logo-swap > .logo-ink   { display: none; }
[data-theme="dark"] .logo-swap > .logo-paper { display: block; }

.brand .legal {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding-left: 10px;
  margin-left: 4px;
  border-left: 1px solid var(--rule);
}

.nav {
  justify-self: center;
  display: flex;
  gap: 28px;
  font-size: 13.5px;
  letter-spacing: 0.005em;
}
.nav a {
  color: var(--ink-2);
  position: relative;
  padding: 6px 0;
}
.nav a:hover { color: var(--ink); }
.nav a.active { color: var(--ink); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--ink);
}

/* Topbar right cluster: language switcher */
.topbar-right {
  display: inline-flex;
  align-items: center;
  gap: 16px;
}

/* Hamburger button — hidden on desktop, surfaced via media query on mobile */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--rule);
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
  justify-self: end;
}
.nav-hamburger:hover { background: var(--paper-2); border-color: var(--rule-2); }
.nav-hamburger-bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 220ms ease, opacity 180ms ease;
}
.nav-hamburger[aria-expanded="true"] .nav-hamburger-bar:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] .nav-hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-hamburger[aria-expanded="true"] .nav-hamburger-bar:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* Language switcher — compact dropdown. Trigger shows the current language;
   the menu opens with the alternates. Sharp edges, mono type, paper/ink palette. */
.lang-dropdown {
  position: relative;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 10px;
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
  text-transform: uppercase;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, color 120ms ease;
}
.lang-toggle:hover { border-color: var(--rule-2); background: var(--paper-2); }
.lang-dropdown.open .lang-toggle { border-color: var(--ink); }
.lang-chevron { transition: transform 200ms ease; color: var(--muted); }
.lang-toggle:hover .lang-chevron,
.lang-dropdown.open .lang-chevron { color: var(--ink); }
.lang-dropdown.open .lang-chevron { transform: rotate(180deg); }

.lang-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 100%;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  z-index: 60;
}
.lang-dropdown.open .lang-menu { display: block; }
.lang-menu li { display: block; }
.lang-menu a {
  display: block;
  padding: 8px 14px;
  color: var(--muted);
  text-transform: uppercase;
  white-space: nowrap;
}
.lang-menu a:hover { color: var(--ink); background: var(--paper-2); }
.lang-menu a.active { color: var(--paper); background: var(--ink); }

/* Mobile topbar — collapse panel below the sticky header, toggled by the hamburger.
   Anchored to .topbar (position: sticky → containing block) so the panel sticks too. */
@media (max-width: 880px) {
  .topbar-inner {
    grid-template-columns: 1fr auto;
    gap: 16px;
  }
  .nav-hamburger { display: inline-flex; }

  .topbar-collapse {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: color-mix(in oklab, var(--paper) 98%, transparent);
    backdrop-filter: saturate(140%) blur(8px);
    -webkit-backdrop-filter: saturate(140%) blur(8px);
    border-bottom: 1px solid var(--rule);
    padding: 0 var(--pad-x);
    max-height: 0;
    overflow: hidden;
    transition: max-height 280ms ease, padding 240ms ease;
    z-index: 49;
  }
  .topbar-collapse.open {
    max-height: calc(100vh - 64px);
    padding: 8px var(--pad-x) 20px;
    overflow-y: auto;
  }

  .nav {
    justify-self: stretch;
    display: flex;
    flex-direction: column;
    gap: 0;
    font-size: 16px;
  }
  .nav a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--rule);
    color: var(--ink);
  }
  .nav a.active::after { display: none; }
  .nav a.active { color: var(--ox); }

  .topbar-right {
    padding: 16px 0 4px;
    justify-content: flex-start;
  }
  .lang-dropdown { display: inline-flex; }
}

@media (max-width: 560px) {
  /* Keep the brand lockup compact: drop the legal-form pill on the smallest screens. */
  .brand .legal { display: none; }
}

/* ─── Hero ─────────────────────────────────────────────────────── */

.hero {
  padding-top: clamp(72px, 9vw, 140px);
  padding-bottom: clamp(56px, 7vw, 110px);
}
.hero .display em { font-style: normal; color: var(--ox); }

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.hero-meta .item .k {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.hero-meta .item .v {
  font-size: 14px;
  color: var(--ink);
}

@media (max-width: 880px) {
  .hero-meta { grid-template-columns: 1fr 1fr; }
}

/* ─── Mission band ─────────────────────────────────────────────── */

.mission {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--gap);
  align-items: start;
}
.mission .label { padding-top: 6px; }
.mission .copy { font-size: clamp(22px, 2.4vw, 34px); line-height: 1.25; letter-spacing: -0.012em; }
.mission .copy em { font-style: normal; color: var(--ox); }
@media (max-width: 880px) { .mission { grid-template-columns: 1fr; } }

/* ─── Principle grid ───────────────────────────────────────────── */

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.principle {
  background: var(--paper);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 240px;
}
.principle .n {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 16px;
}
.principle p { color: var(--ink-2); font-size: 14.5px; }
@media (max-width: 880px) { .principles { grid-template-columns: 1fr; } }

/* ─── Solution cards ───────────────────────────────────────────── */

.solutions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}
@media (max-width: 880px) { .solutions { grid-template-columns: 1fr; } }

/* Product rows — prose + facts in the 5fr column (product-main, natural flow,
   independent of the photo's height), photo + step table in the 7fr column.
   At ≤880px product-main dissolves so its children join the single-column
   grid, and `order` stacks them: lead → media (photo + steps) → facts. */
.product-row {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--gap);
  align-items: start;
}
@media (max-width: 880px) {
  .product-row { grid-template-columns: 1fr; }
  .product-main { display: contents; }
  .product-lead  { order: 1; }
  .product-media { order: 2; }
  .product-facts { order: 3; }
}

.solution {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--rule);
  background: var(--paper);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: border-color 120ms ease, transform 120ms ease;
}
.solution:hover { border-color: var(--ink); }
.solution .thumb {
  aspect-ratio: 16 / 10;
  background: var(--paper-3);
  position: relative;
  overflow: hidden;
}
.solution .body { padding: 24px 24px 28px; display: flex; flex-direction: column; gap: 8px; }
.solution .body .head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.solution .body .head .domain { color: var(--ink); }
.solution .body .head .chip {
  padding: 2px 8px;
  border: 1px solid var(--rule-2);
  border-radius: 100px;
  color: var(--ink-2);
}
.solution .body .head .chip.live { background: var(--ox); border-color: var(--ox); color: oklch(0.98 0.01 85); }
.solution .body .head .chip.dev  { background: transparent; }
.solution:hover .body .head .domain { color: var(--ox); }
.solution .body h3 { font-size: 28px; letter-spacing: -0.018em; margin: 4px 0 6px; font-weight: 500; }
.solution .body p { color: var(--ink-2); margin: 0; }
.solution .body .more {
  margin-top: 16px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: inline-flex; align-items: center; gap: 8px;
}

/* AI placeholder thumb — replace with real images before launch */
.ai-placeholder {
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(135deg,
      transparent 0 14px,
      color-mix(in oklab, var(--ink) 6%, transparent) 14px 15px);
  display: grid;
  place-items: center;
  color: var(--ink-2);
}
.ai-placeholder .ai-label {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  max-width: 70%;
  text-align: center;
  text-wrap: balance;
}
.ai-placeholder .ai-label::before {
  content: "AI image · ";
  color: var(--muted);
}

/* ─── Platform teaser (dark) ───────────────────────────────────── */

.platform-card {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--gap);
  align-items: end;
}
@media (max-width: 880px) { .platform-card { grid-template-columns: 1fr; } }
.platform-card .h1 { color: var(--paper); }
.platform-card .lead { color: var(--rule); }
.platform-card .stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--rule-2);
  opacity: .95;
  border: 1px solid var(--rule-2);
}
.platform-card .stack .row {
  padding: 16px 20px;
  background: var(--ink);
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 20px;
  align-items: center;
  color: var(--paper);
}
@media (max-width: 560px) {
  .platform-card .stack .row {
    grid-template-columns: 1fr auto;
    grid-template-areas: "name status" "desc status";
    gap: 3px 12px;
  }
  .platform-card .stack .row .name { grid-area: name; }
  .platform-card .stack .row .desc { grid-area: desc; }
  .platform-card .stack .row .status { grid-area: status; align-self: center; }
}
.platform-card .stack .row .name {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper);
}
.platform-card .stack .row .desc { color: var(--rule); font-size: 13.5px; }
.platform-card .stack .row .status {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  padding: 2px 8px;
  border: 1px solid var(--rule-2);
  border-radius: 100px;
}

/* ─── CTA strip ────────────────────────────────────────────────── */

.cta-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--gap);
  align-items: end;
}
@media (max-width: 720px) { .cta-strip { grid-template-columns: 1fr; } }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 52px;
  padding: 0 22px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--f-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}
.btn:hover { background: var(--ox); border-color: var(--ox); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn .arrow { transition: transform 120ms ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ─── Forms ────────────────────────────────────────────────────── */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 28px;
  max-width: 720px;
}
.field { display: flex; flex-direction: column; gap: 8px; }
.field.wide { grid-column: 1 / -1; }
.field label {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input, .field textarea, .field select {
  font-family: var(--f-sans);
  font-size: 15px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-2);
  padding: 8px 0;
  outline: none;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
                    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 14px) calc(50% - 2px),
                       calc(100% - 9px) calc(50% - 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 28px;
}
.field input:focus, .field textarea:focus, .field select:focus { border-bottom-color: var(--ink); }
.field textarea { resize: vertical; min-height: 96px; line-height: 1.5; }
.field .hint { font-size: 12px; color: var(--muted); }
@media (max-width: 720px) { .form-grid { grid-template-columns: 1fr; } }

.consent {
  grid-column: 1 / -1;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 13px;
  color: var(--ink-2);
}
.consent input { margin-top: 4px; accent-color: var(--ink); }
.consent a { border-bottom: 1px solid var(--rule-2); }

/* Honeypot — kept in the layout for bots, hidden from humans */
.hp {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact-status[data-kind="ok"]    { color: var(--ox); }
.contact-status[data-kind="error"] { color: #b13a2a; }

/* ─── About / team ─────────────────────────────────────────────── */

.split-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--gap) calc(var(--gap) * 1.5);
}
@media (max-width: 880px) { .split-2 { grid-template-columns: 1fr; } }

.team {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.team.team-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 720px;
}
@media (max-width: 880px) { .team { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .team, .team.team-2 { grid-template-columns: 1fr; } }

.member {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.member .portrait {
  aspect-ratio: 4 / 5;
  background: var(--paper-3);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule);
}
.member .portrait.portrait-bw img {
  filter: grayscale(100%) contrast(1.02);
}
.member .name { font-size: 18px; letter-spacing: -0.005em; margin: 6px 0 0; font-weight: 500; }
.member .role { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.member .bio { font-size: 14px; color: var(--ink-2); margin-top: 4px; }

/* ─── Legal pages ──────────────────────────────────────────────── */

.legal-grid {
  display: grid;
  grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
  gap: var(--gap) 64px;
  align-items: start;
}
@media (max-width: 880px) { .legal-grid { grid-template-columns: 1fr; } }

.toc {
  position: sticky;
  top: 96px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.toc h4 { color: var(--muted); margin: 0 0 12px; font-weight: 500; letter-spacing: 0.14em; }
.toc ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.toc a { color: var(--ink-2); padding: 4px 0; display: block; border-left: 1px solid var(--rule); padding-left: 14px; margin-left: -14px; }
.toc a:hover { color: var(--ink); border-color: var(--ink); }

.prose { max-width: 68ch; }
.prose h2 { font-size: 18px; letter-spacing: 0.02em; margin: 32px 0 12px; padding-top: 32px; border-top: 1px solid var(--rule); }
.prose h2:first-child { padding-top: 0; border-top: 0; margin-top: 0; }
.prose h3 { font-size: 14px; font-weight: 500; margin: 20px 0 8px; }
.prose p, .prose li { font-size: 14.5px; color: var(--ink-2); line-height: 1.65; }
.prose ul, .prose ol { padding-left: 20px; margin: 0 0 1em; }
.prose dl { display: grid; grid-template-columns: 180px 1fr; gap: 8px 24px; font-size: 14.5px; margin: 0 0 1em; }
.prose dl dt { color: var(--muted); font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; padding-top: 3px; }
.prose dl dd { margin: 0; color: var(--ink-2); }
.prose table { width: 100%; border-collapse: collapse; font-size: 13.5px; margin: 12px 0 24px; }
.prose table th, .prose table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose table th { font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
.prose code { font-family: var(--f-mono); font-size: 12.5px; background: var(--paper-2); padding: 1px 6px; }
.prose strong { color: var(--ink); font-weight: 500; }

/* ─── Footer ───────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
  margin-top: var(--section-y);
  padding: 56px 0 32px;
}
.footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h5 {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
  font-weight: 500;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; font-size: 13.5px; }
.footer-grid a { color: var(--ink-2); }
.footer-grid a:hover { color: var(--ox); }
.footer-grid .about { font-size: 13.5px; color: var(--ink-2); max-width: 36ch; }
.footer-grid .about img { height: 30px; margin-bottom: 18px; }
.footer-bottom {
  max-width: var(--max);
  margin: 48px auto 0;
  padding: 24px var(--pad-x) 0;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* ─── Skip helpers ─────────────────────────────────────────────── */

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link:focus {
  position: fixed;
  top: 12px; left: 12px;
  z-index: 100;
  width: auto; height: auto;
  padding: 8px 14px;
  clip: auto;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}