/* =========================================================================
   Koira — instrument-grade
   Light-first. Near-monochrome neutrals, one saturated signal accent,
   hairline rules, mono for anything that behaves like a part number.

   To reshade the whole site, change --accent in the three palette blocks
   below. Nothing else hard-codes a brand colour.
   ========================================================================= */

/* ---------- palette: light (also the base every other mode overrides) ---- */
:root {
  color-scheme: light;

  --bg:        #FCFCFB;
  --bg-cell:   #FFFFFF;
  --panel:     #F4F3F0;

  --ink:       #0F1012;
  --ink-2:     #43474D;
  --ink-3:     #7C828B;

  --line:      #E2E1DD;
  --line-2:    #C9C7C1;

  --accent:    #CC3D1A;
  --accent-2:  #A8300F;
  --accent-bg: #FBEDE8;

  --btn-bg:    #0F1012;
  --btn-fg:    #FCFCFB;

  --sel-bg:    #0F1012;
  --sel-fg:    #FCFCFB;

  /* type */
  --sans: "Helvetica Neue", Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", SFMono-Regular, Menlo, Consolas,
          "Liberation Mono", monospace;

  /* metrics */
  --wrap: 1240px;
  --pad: clamp(20px, 4.5vw, 44px);
  --ease: cubic-bezier(.22, .68, .32, 1);
}

/* ---------- palette: dark via OS preference ----------------------------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --bg:        #0B0C0E;
    --bg-cell:   #101215;
    --panel:     #16181C;

    --ink:       #EDEDEF;
    --ink-2:     #A8AEB6;
    --ink-3:     #757C86;

    --line:      #23262B;
    --line-2:    #363A41;

    --accent:    #FF7B55;
    --accent-2:  #FF9878;
    --accent-bg: #24160F;

    --btn-bg:    #EDEDEF;
    --btn-fg:    #0B0C0E;

    --sel-bg:    #EDEDEF;
    --sel-fg:    #0B0C0E;
  }
}

/* ---------- palette: dark forced by the toggle -------------------------- */
:root[data-theme="dark"] {
  color-scheme: dark;

  --bg:        #0B0C0E;
  --bg-cell:   #101215;
  --panel:     #16181C;

  --ink:       #EDEDEF;
  --ink-2:     #A8AEB6;
  --ink-3:     #757C86;

  --line:      #23262B;
  --line-2:    #363A41;

  --accent:    #FF7B55;
  --accent-2:  #FF9878;
  --accent-bg: #24160F;

  --btn-bg:    #EDEDEF;
  --btn-fg:    #0B0C0E;

  --sel-bg:    #EDEDEF;
  --sel-fg:    #0B0C0E;
}

/* ---------- base -------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.55;
  letter-spacing: -.004em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--sel-bg); color: var(--sel-fg); }

img, svg { max-width: 100%; }
img { display: block; height: auto; }

h1, h2, h3, h4 { margin: 0 0 .5em; font-weight: 500; letter-spacing: -.028em; line-height: 1.1; }
h1 { font-size: clamp(2.4rem, 5.2vw, 4rem); letter-spacing: -.038em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); letter-spacing: -.032em; }
h3 { font-size: 1.05rem; letter-spacing: -.016em; }
h4 { font-size: .95rem; }
p  { margin: 0 0 1em; }

a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad); }

.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 {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--bg); padding: 10px 16px; font-weight: 500;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- index label (00 —— PHYSICAL AI) ----------------------------- */

.idx {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: .7rem; font-weight: 500;
  letter-spacing: .15em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 1.4rem;
}
.idx-n { color: var(--accent); }
.idx-r { width: 26px; height: 1px; background: var(--line-2); flex: none; }

/* ---------- masthead ---------------------------------------------------- */

.masthead {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .masthead { background: var(--bg); }
}
.masthead.stuck { border-bottom-color: var(--line); }

.masthead-in { display: flex; align-items: center; gap: 24px; height: 64px; }

.brand { display: inline-flex; align-items: center; gap: 9px; flex: none; }
.brand-mark { width: 26px; height: 26px; color: var(--accent); flex: none; }
.brand-word { font-size: 1.16rem; font-weight: 500; letter-spacing: -.035em; }

.nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav a {
  padding: 7px 12px; font-size: .875rem; color: var(--ink-2);
  transition: color .15s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a.on { color: var(--accent); }

.masthead-end { display: flex; align-items: center; gap: 6px; flex: none; }

.cta-link {
  font-size: .875rem; padding: 7px 12px; color: var(--ink);
  border-bottom: 1px solid transparent;
}
.cta-link:hover { color: var(--accent); }

.theme-btn, .nav-btn {
  width: 34px; height: 34px; padding: 0; display: grid; place-items: center;
  background: none; border: 1px solid var(--line); border-radius: 3px;
  color: var(--ink-2); cursor: pointer;
  transition: border-color .15s var(--ease), color .15s var(--ease);
}
.theme-btn:hover, .nav-btn:hover { border-color: var(--line-2); color: var(--ink); }
.ico { width: 16px; height: 16px; }

/* moon in light mode, sun in dark — the icon shows what you switch to */
.theme-btn .sun { display: none; }
:root[data-theme="dark"] .theme-btn .sun { display: block; }
:root[data-theme="dark"] .theme-btn .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .sun { display: block; }
  :root:not([data-theme="light"]) .theme-btn .moon { display: none; }
}

.nav-btn { display: none; }
.nav-btn span {
  display: block; width: 15px; height: 1px; background: currentColor; margin: 2.5px 0;
  transition: transform .2s var(--ease), opacity .15s var(--ease);
}
.nav-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(1.8px) rotate(45deg); }
.nav-btn[aria-expanded="true"] span:nth-child(2) { transform: translateY(-1.8px) rotate(-45deg); }

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

.hero { padding: clamp(64px, 11vw, 132px) 0 clamp(44px, 6vw, 72px); }
.hero h1 { max-width: 17ch; margin-bottom: 0; }

.short-rule {
  width: 210px; height: 1px; background: var(--line-2);
  border: 0; margin: clamp(28px, 4vw, 44px) 0 clamp(22px, 3vw, 30px);
}

.hero-sub {
  max-width: 62ch; font-size: clamp(1rem, 1.35vw, 1.14rem);
  color: var(--ink-2); margin-bottom: 2.2rem;
}

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px; }

.btn {
  display: inline-flex; align-items: center; gap: .5em;
  background: var(--btn-bg); color: var(--btn-fg);
  padding: .78em 1.5em; border-radius: 3px;
  font-size: .9rem; font-weight: 500;
  transition: opacity .15s var(--ease);
}
.btn:hover { opacity: .85; }

.btn-text {
  font-size: .9rem; font-weight: 500; color: var(--ink);
  border-bottom: 1px solid var(--line-2); padding-bottom: 2px;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}
.btn-text:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- locations strip -------------------------------------------- */

.strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.strip-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.strip-cell {
  padding: 22px 26px 22px 0; display: flex; flex-direction: column; gap: 3px;
  border-left: 1px solid var(--line);
  padding-left: 26px;
}
.strip-cell:first-child { border-left: 0; padding-left: 0; }
.strip-cell .k { font-size: .95rem; font-weight: 500; }
.strip-cell .v {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-3);
}

/* ---------- interfaces -------------------------------------------------- */

.ifaces { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 26px; padding: 26px 0 4px; }
.ifaces-lbl {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .15em;
  text-transform: uppercase; color: var(--ink-3);
}
.ifaces ul { display: flex; flex-wrap: wrap; gap: 10px 20px; list-style: none; margin: 0; padding: 0; }
.ifaces li {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .04em; color: var(--ink-2);
}

/* ---------- sections ---------------------------------------------------- */

.sec { padding: clamp(60px, 8.5vw, 110px) 0; border-top: 1px solid var(--line); }
#what { border-top: 0; }

.sec-head {
  display: grid; grid-template-columns: 210px minmax(0, 1fr);
  gap: 8px 40px; margin-bottom: clamp(34px, 5vw, 52px);
}
/* .idx is a flex row that centres its own content; as a stretched grid item it
   would float to the middle of the heading block, so pin it to the top */
.sec-head .idx { margin: 8px 0 0; align-self: start; }
.sec-title { max-width: 60ch; }
.sec-title h2 { margin-bottom: .5em; }
.lede { color: var(--ink-2); font-size: 1.02rem; margin: 0; }

/* ---------- hairline cell grids ---------------------------------------- */

.cells {
  display: grid; gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.cells-3 { grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); }
.cells-4 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.mt { margin-top: 26px; }

.cell {
  background: var(--bg-cell);
  padding: 30px 28px 28px;
  display: flex; flex-direction: column;
}
.cell-n {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  color: var(--accent); margin-bottom: 16px;
}
.cell h3 { margin-bottom: .5em; }
.cell p { color: var(--ink-2); font-size: .93rem; margin: 0; }
.cell p + p { margin-top: .7em; }

.cell-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.cc {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .12em;
  color: var(--accent); border: 1px solid var(--line-2); border-radius: 2px; padding: 3px 8px;
}
.state {
  font-family: var(--mono); font-size: .64rem; letter-spacing: .12em; text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 6px; color: var(--ink-3);
}
.state::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.state.on { color: var(--accent); }
.state.building { color: var(--ink-3); }
.cell-role {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .06em;
  color: var(--ink-3); margin-bottom: .9em !important;
}

/* ---------- note -------------------------------------------------------- */

.note {
  display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap;
  margin-top: 26px; padding: 22px 26px;
  background: var(--accent-bg);
  border: 1px solid var(--line);
}
.note p { margin: 0; color: var(--ink-2); font-size: .93rem; flex: 1 1 320px; }
.note strong { color: var(--ink); font-weight: 500; }
.note-tag {
  font-family: var(--mono); font-size: .64rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); white-space: nowrap; flex: none; padding-top: 3px;
}

/* ---------- stack ------------------------------------------------------- */

.stack { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); }
.layer {
  display: grid; grid-template-columns: 54px minmax(0, 1fr) auto;
  gap: 20px; align-items: baseline;
  padding: 20px 26px;
  background: var(--bg-cell);
  border-bottom: 1px solid var(--line);
}
.layer:last-child { border-bottom: 0; }
.lv {
  font-family: var(--mono); font-size: .78rem; letter-spacing: .06em; color: var(--ink-3);
}
.layer h3 { margin: 0 0 .3em; }
.layer p { margin: 0; color: var(--ink-2); font-size: .91rem; }
.lo {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-3); white-space: nowrap;
}
.layer.is-yours { background: var(--panel); }
.layer.is-yours .lv { color: var(--ink-3); }
.layer.is-sw { box-shadow: inset 2px 0 0 var(--ink); }
.layer.is-sw .lv { color: var(--ink); }
.layer.is-hw { box-shadow: inset 2px 0 0 var(--accent); }
.layer.is-hw .lv { color: var(--accent); }
.layer.is-bus { box-shadow: inset 2px 0 0 var(--line-2); }

/* ---------- split (hardware) ------------------------------------------- */

.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 56px); align-items: start; }
.fig { margin: 0; border: 1px solid var(--line); background: var(--bg-cell); padding: 22px; }
.board { width: 100%; height: auto; overflow: visible; }
.t-lbl { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; fill: var(--ink); }
.t-sub { font-family: var(--mono); font-size: 8.5px; letter-spacing: .12em; fill: var(--ink-3); }
.t-dim { font-family: var(--mono); font-size: 8px; letter-spacing: .2em; fill: var(--ink-3); }

.specs { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.specs li {
  display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 18px;
  padding: 13px 0; border-bottom: 1px solid var(--line);
  font-size: .93rem;
}
.specs li > span:first-child {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-3); padding-top: 3px;
}
.specs li > span:last-child { color: var(--ink-2); }

/* ---------- spec table -------------------------------------------------- */

.table-scroll { overflow-x: auto; border: 1px solid var(--line); }
.spec-table { width: 100%; min-width: 640px; border-collapse: collapse; background: var(--bg-cell); }
.spec-table th, .spec-table td { text-align: left; padding: 14px 20px; vertical-align: top; }
.spec-table thead th {
  font-family: var(--mono); font-size: .66rem; font-weight: 500;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3);
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.spec-table tbody tr { border-bottom: 1px solid var(--line); }
.spec-table tbody tr:last-child { border-bottom: 0; }
.spec-table tbody th {
  font-size: .93rem; font-weight: 500; color: var(--ink); white-space: nowrap;
}
.spec-table tbody td { font-size: .91rem; color: var(--ink-2); }
.spec-table tbody td:last-child {
  font-family: var(--mono); font-size: .76rem; color: var(--ink-3); white-space: nowrap;
}
.spec-table tbody tr:hover { background: var(--panel); }

/* ---------- robot figures ---------------------------------------------- */

.cell-fig { padding-top: 0; }
.art {
  height: 190px; display: grid; place-items: center;
  color: var(--ink-2);
  border-bottom: 1px solid var(--line);
  margin: 0 -28px 24px;
  background: var(--panel);
}
.art svg { height: 132px; width: auto; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 0; padding: 0; }
.tags li {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .05em;
  color: var(--ink-3); border: 1px solid var(--line); border-radius: 2px; padding: 3px 8px;
}

/* ---------- pull quote -------------------------------------------------- */

.pull { margin: 34px 0; }
.pull blockquote {
  margin: 0; padding: 4px 0 4px 30px;
  border-left: 2px solid var(--accent);
  font-size: clamp(1.1rem, 2.1vw, 1.5rem);
  line-height: 1.38; letter-spacing: -.025em; color: var(--ink);
  max-width: 46ch;
}
.pull blockquote::before { content: "“"; }
.pull blockquote::after { content: "”"; }

/* ---------- timeline ---------------------------------------------------- */

.timeline {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  border-top: 1px solid var(--line-2);
}
.timeline li { padding: 24px 22px 0 0; position: relative; }
.timeline li::before {
  content: ""; position: absolute; top: -1px; left: 0; width: 22px; height: 3px;
  background: var(--line-2);
}
.timeline li.now::before { background: var(--accent); }
.tl-d {
  display: block; font-family: var(--mono); font-size: .66rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .9em;
}
.timeline li.now .tl-d { color: var(--accent); }
.timeline h3 { margin-bottom: .4em; }
.timeline p { margin: 0; color: var(--ink-2); font-size: .9rem; }

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

.cell-person { padding: 0; }
.cell-person img {
  width: 100%; aspect-ratio: 1; object-fit: cover;
  border-bottom: 1px solid var(--line);
}
.p-body { padding: 22px 24px 24px; }
.p-body h3 { margin-bottom: .15em; }
.p-role { font-size: .9rem; color: var(--accent); margin-bottom: .3em !important; }
.p-loc {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .09em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 1em !important;
}
.p-body > p:last-child { font-size: .88rem; }

.after { margin: 26px 0 0; color: var(--ink-2); font-size: .93rem; }
.after a { color: var(--accent); border-bottom: 1px solid var(--line-2); }
.after a:hover { border-color: var(--accent); }

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

.cell-link { position: relative; transition: background .15s var(--ease); }
.cell-link:hover { background: var(--panel); }
.cl-k {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .13em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px;
}
.cl-v { font-size: 1.02rem; font-weight: 500; }
.cl-a { position: absolute; top: 28px; right: 26px; color: var(--ink-3); transition: color .15s var(--ease); }
.cell-link:hover .cl-a { color: var(--accent); }

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

.foot { border-top: 1px solid var(--line); padding-top: clamp(40px, 5vw, 60px); }
.foot-in { display: grid; grid-template-columns: 1.1fr 1.5fr; gap: clamp(28px, 5vw, 60px); padding-bottom: 40px; }
.foot-note { margin: 14px 0 0; max-width: 42ch; color: var(--ink-3); font-size: .86rem; }
.foot-note em { font-style: italic; color: var(--ink-2); }

.foot-nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.foot-nav h4 {
  font-family: var(--mono); font-size: .64rem; font-weight: 500; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 1.1em;
}
.foot-nav a { display: block; font-size: .89rem; color: var(--ink-2); padding: 4px 0; }
.foot-nav a:hover { color: var(--accent); }

.foot-end {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  border-top: 1px solid var(--line); padding-block: 18px 24px;
}
.foot-end p {
  margin: 0; font-family: var(--mono); font-size: .68rem;
  letter-spacing: .08em; color: var(--ink-3);
}

/* ---------- reveal ------------------------------------------------------ */

.js [data-reveal] {
  opacity: 0; transform: translateY(12px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.js [data-reveal].in { opacity: 1; transform: none; }

/* ---------- responsive -------------------------------------------------- */

@media (max-width: 1000px) {
  .sec-head { grid-template-columns: 1fr; gap: 0; }
  .sec-head .idx { margin-bottom: 1.2rem; }
  .split { grid-template-columns: 1fr; }
  .fig { max-width: 520px; }
  .foot-in { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  html { scroll-padding-top: 68px; }
  .nav-btn { display: grid; }
  .nav {
    position: fixed; inset: 64px 0 auto; margin: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 8px var(--pad) 18px;
    transform: translateY(-6px); opacity: 0; pointer-events: none;
    transition: opacity .18s var(--ease), transform .18s var(--ease);
  }
  .nav.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav a { padding: 12px 0; font-size: .98rem; border-bottom: 1px solid var(--line); }
  .nav a:last-child { border-bottom: 0; }
  .cta-link { display: none; }
  .layer { grid-template-columns: 44px minmax(0, 1fr); gap: 14px; }
  .lo { display: none; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .strip-grid { grid-template-columns: 1fr; }
  .strip-cell { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
  .strip-cell:first-child { border-top: 0; }
  .specs li { grid-template-columns: 1fr; gap: 3px; }
  .foot-nav { grid-template-columns: 1fr 1fr; }
  .pull blockquote { padding-left: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .masthead, .nav-btn, .theme-btn { display: none; }
  body { background: #fff; color: #000; }
  .cells, .cell, .fig, .stack { border-color: #ccc; }
}