/* ---------------------------------------------------------------------------
   OpenStacks house style.

   Tokens, type and border conventions are taken from openstacks.dev so the
   stack repositories read as one family rather than eight one-off pages.
   Deliberately: 2px borders and no shadows, no border-radius, display type in
   uppercase Bricolage, monospace for labels and numbers.
   --------------------------------------------------------------------------- */

:root {
  --black: #0d0d0f;
  --white: #f6f2ea;
  --grey: #8a8a90;
  --navy: #14305c;
  --saffron: #f2a541;
  --teal: #0f6e56;
  --brick: #b23a2a;
  --ash: #d9d5cc;

  --display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --sans: "Work Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --pad: clamp(1.1rem, 4vw, 3.5rem);
  --ink: var(--black);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 3.6rem; }
body {
  font-family: var(--sans);
  background: var(--white);
  color: var(--black);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 3px solid var(--saffron); outline-offset: 3px; }
.mono { font-family: var(--mono); }

/* Screen-reader-only, for the skip link and hidden labels. */
.sr { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden;
      clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -999px; top: 0; z-index: 60; background: var(--saffron);
        color: var(--black); padding: .7rem 1rem; font-family: var(--mono); font-size: .8rem; }
.skip:focus { left: 0; }

/* --- top bar ------------------------------------------------------------- */
.top { position: sticky; top: 0; z-index: 30; background: var(--black); color: var(--white);
       border-bottom: 2px solid var(--black); }
.top .in { display: flex; align-items: stretch; justify-content: space-between;
           height: 3.6rem; padding: 0 var(--pad); }
.brand { display: flex; align-items: center; gap: .6rem; font-family: var(--display);
         font-weight: 700; font-size: .9rem; text-transform: uppercase; white-space: nowrap; }
.brand .dot { width: 10px; height: 10px; background: var(--saffron); display: inline-block; }
.top nav { display: flex; }
.top nav a { display: flex; align-items: center; padding: 0 1rem; font-family: var(--mono);
             font-size: .78rem; text-transform: uppercase; letter-spacing: .06em;
             border-left: 2px solid var(--white); white-space: nowrap; }
.top nav a:hover { background: var(--white); color: var(--black); }
@media (max-width: 760px) {
  .top nav a.opt { display: none; }
  .brand { font-size: .8rem; }
  .top nav a { padding: 0 .8rem; }
}

/* --- hero ---------------------------------------------------------------- */
.hero { padding: clamp(2.2rem, 6vw, 5rem) var(--pad) clamp(1.8rem, 4vw, 3rem);
        border-bottom: 2px solid var(--black); background: var(--black); color: var(--white); }
.word { font-family: var(--display); font-weight: 800; text-transform: uppercase;
        line-height: .88; letter-spacing: -.035em; font-size: clamp(2.4rem, 11vw, 8rem); }
.word .s2 { color: var(--saffron); }
.hero p.lede { font-size: clamp(1rem, 1.5vw, 1.2rem); max-width: 56ch; color: #d8d3c8;
               margin-top: 1.4rem; }
.hero p.lede a { text-decoration: underline; text-decoration-color: var(--saffron);
                 text-underline-offset: 3px; }
.counts { display: grid; grid-template-columns: repeat(4, 1fr); border: 2px solid var(--white);
          margin-top: 2rem; }
.counts div { padding: .9rem; border-left: 2px solid var(--white); }
.counts div:first-child { border-left: none; }
.counts b { display: block; font-family: var(--display); font-weight: 800;
            font-size: clamp(1.6rem, 4vw, 2.6rem); line-height: 1; }
.counts span { display: block; font-family: var(--mono); font-size: .66rem;
               text-transform: uppercase; letter-spacing: .06em; color: var(--grey); margin-top: .35rem; }
.counts div.hi b { color: var(--saffron); }
@media (max-width: 860px) {
  .counts { grid-template-columns: 1fr 1fr; }
  .counts div:nth-child(3) { border-left: none; }
  .counts div:nth-child(n+3) { border-top: 2px solid var(--white); }
}

/* --- bands --------------------------------------------------------------- */
.band { padding: clamp(1.8rem, 4vw, 3.4rem) var(--pad); border-bottom: 2px solid var(--black); }
.band.white { background: var(--white); color: var(--black); --ink: var(--black); --bg: var(--white); }
.band.ash   { background: var(--ash);   color: var(--black); --ink: var(--black); --bg: var(--ash); }
.band.navy  { background: var(--navy);  color: var(--white); --ink: var(--white); --bg: var(--navy); }
.band.teal  { background: var(--teal);  color: var(--white); --ink: var(--white); --bg: var(--teal); }
.band.brick { background: var(--brick); color: var(--white); --ink: var(--white); --bg: var(--brick); }
.band.black { background: var(--black); color: var(--white); --ink: var(--white); --bg: var(--black); }
.band-h { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
          flex-wrap: wrap; margin-bottom: 1.4rem; }
.band-h h2 { font-family: var(--display); font-weight: 800; text-transform: uppercase;
             letter-spacing: -.02em; line-height: .95; font-size: clamp(1.7rem, 5vw, 3.4rem); }
.band-h .sub { font-family: var(--mono); font-size: .76rem; text-transform: uppercase;
               letter-spacing: .06em; opacity: .8; }
.band > p.note { font-size: .95rem; max-width: 70ch; margin-top: 1rem; }
.band > p.note a { text-decoration: underline; text-underline-offset: 3px; }

/* --- tiles --------------------------------------------------------------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
         gap: 0; border: 2px solid var(--ink); }
.tile { display: flex; flex-direction: column; padding: 1.1rem; border: 1px solid var(--ink);
        margin: -.5px; min-height: 11rem; background: var(--bg);
        transition: background .12s, color .12s; }
.tile:hover, .tile:focus-visible { background: var(--ink); color: var(--bg); }
.tile .meta { font-family: var(--mono); font-size: .68rem; text-transform: uppercase;
              letter-spacing: .06em; opacity: .75; margin-bottom: .7rem; }
.tile h3 { font-family: var(--display); font-weight: 700; font-size: 1.35rem; line-height: 1.05;
           letter-spacing: -.02em; margin-bottom: .45rem; }
.tile p { font-size: .86rem; line-height: 1.45; opacity: .92; flex: 1; }
.tile .go { font-family: var(--mono); font-size: .68rem; text-transform: uppercase;
            letter-spacing: .06em; margin-top: .9rem; }

/* Compact index rows, for long folder lists. */
.rows { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
        border: 2px solid var(--ink); }
.row { padding: .75rem 1rem; border: 1px solid var(--ink); margin: -.5px;
       display: flex; justify-content: space-between; align-items: baseline; gap: .6rem;
       transition: background .12s, color .12s; }
.row:hover, .row:focus-visible { background: var(--ink); color: var(--bg); }
.row b { font-weight: 600; font-size: .95rem; }
.row span { font-family: var(--mono); font-size: .66rem; opacity: .7; white-space: nowrap; }

/* --- calculator layout --------------------------------------------------- */
.calc { display: grid; grid-template-columns: 1.05fr .95fr; gap: 0;
        border: 2px solid var(--black); }
.calc .in, .calc .out { padding: clamp(1.1rem, 3vw, 1.9rem); }
.calc .out { border-left: 2px solid var(--black); background: var(--ash); }
@media (max-width: 860px) {
  .calc { grid-template-columns: 1fr; }
  .calc .out { border-left: none; border-top: 2px solid var(--black); }
}
.field { margin-bottom: 1.05rem; }
.field label { display: block; font-family: var(--mono); font-size: .72rem;
               text-transform: uppercase; letter-spacing: .06em; margin-bottom: .35rem; }
.field .hint { display: block; font-size: .78rem; opacity: .7; margin-top: .3rem;
               text-transform: none; letter-spacing: 0; font-family: var(--sans); }
.field input, .field select {
  font: 500 1rem var(--sans); width: 100%; padding: .6rem .7rem;
  background: var(--white); color: var(--black); border: 2px solid var(--black);
}
.field input:focus, .field select:focus { outline: 3px solid var(--saffron); outline-offset: 2px; }
.field.bad input, .field.bad select { border-color: var(--brick); }
.field .err { display: none; font-family: var(--mono); font-size: .7rem; color: var(--brick);
              margin-top: .35rem; text-transform: uppercase; letter-spacing: .04em; }
.field.bad .err { display: block; }

.btn { display: inline-block; font-family: var(--mono); font-size: .8rem; text-transform: uppercase;
       letter-spacing: .06em; padding: .8rem 1.3rem; border: 2px solid var(--black);
       background: var(--white); color: var(--black); cursor: pointer; }
.btn:hover { background: var(--black); color: var(--white); }
.btn.fill { background: var(--saffron); border-color: var(--saffron); }
.btn.fill:hover { background: var(--black); border-color: var(--black); color: var(--white); }
.actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1.3rem; }

.out h2 { font-family: var(--display); font-weight: 800; text-transform: uppercase;
          font-size: 1.1rem; letter-spacing: .02em; margin-bottom: 1rem; }
.res { border: 2px solid var(--black); background: var(--white); }
.res div { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
           padding: .8rem 1rem; border-top: 2px solid var(--black); }
.res div:first-child { border-top: none; }
.res dt, .res .k { font-family: var(--mono); font-size: .72rem; text-transform: uppercase;
                   letter-spacing: .06em; opacity: .8; }
.res .v { font-family: var(--display); font-weight: 800; font-size: 1.5rem; line-height: 1;
          letter-spacing: -.02em; white-space: nowrap; }
.res div.lead { background: var(--saffron); }
.res div.lead .v { font-size: 2rem; }
.out .empty { font-size: .9rem; opacity: .75; }
.assump { font-size: .82rem; margin-top: 1rem; opacity: .85; max-width: 46ch; }
.assump code { font-family: var(--mono); font-size: .95em; }

/* --- footer -------------------------------------------------------------- */
.foot { padding: clamp(1.6rem, 4vw, 2.6rem) var(--pad); background: var(--black);
        color: var(--white); font-size: .88rem; }
.foot a { text-decoration: underline; text-underline-offset: 3px; }
.foot .fl { display: flex; gap: 1.2rem; flex-wrap: wrap; font-family: var(--mono);
            font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: .9rem; }
.foot p { color: #d8d3c8; max-width: 70ch; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* --- rendered markdown (Jekyll folder pages) ------------------------------
   Without this, a folder README renders in whatever theme Jekyll supplies and
   the site changes appearance the moment anyone clicks through. */
.prose { max-width: 74ch; }
.prose h1 { font-family: var(--display); font-weight: 800; text-transform: uppercase;
            letter-spacing: -.02em; line-height: .95; font-size: clamp(1.8rem, 5vw, 3.2rem);
            margin-bottom: 1rem; }
.prose h2 { font-family: var(--display); font-weight: 800; font-size: 1.5rem;
            letter-spacing: -.01em; margin: 2rem 0 .7rem; }
.prose h3 { font-family: var(--display); font-weight: 700; font-size: 1.15rem;
            margin: 1.5rem 0 .5rem; }
.prose p, .prose li { font-size: .98rem; margin-bottom: .7rem; }
.prose ul, .prose ol { margin: 0 0 .9rem 1.2rem; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--ash);
              padding: .1rem .3rem; }
.prose pre { font-family: var(--mono); font-size: .82rem; background: var(--black);
             color: var(--white); padding: 1rem; overflow-x: auto; margin-bottom: 1rem;
             border: 2px solid var(--black); }
.prose pre code { background: none; padding: 0; color: inherit; }
.prose table { border-collapse: collapse; width: 100%; margin-bottom: 1.2rem;
               display: block; overflow-x: auto; }
.prose th, .prose td { border: 2px solid var(--black); padding: .5rem .7rem;
                       font-size: .88rem; text-align: left; }
.prose th { font-family: var(--mono); font-size: .74rem; text-transform: uppercase;
            letter-spacing: .06em; }
.prose blockquote { border-left: 4px solid var(--saffron); padding-left: 1rem;
                    margin: 0 0 1rem; }
.prose img { max-width: 100%; height: auto; border: 2px solid var(--black); }
.prose hr { border: none; border-top: 2px solid var(--black); margin: 2rem 0; }

/* Descriptions in the compact source list. A visible line beats a hover title,
   which no touch device shows and no screen reader announces reliably.
   `.row span` above sets white-space: nowrap for the short language tag. A
   description is also a span, so it inherited that and ran off the side of the
   phone instead of wrapping. Scope the nowrap to the tag. */
.row { flex-direction: column; align-items: flex-start; gap: .25rem; }
.row .d { font-size: .8rem; opacity: .78; line-height: 1.35;
          white-space: normal; overflow-wrap: anywhere; }
.row .t { display: flex; justify-content: space-between; align-items: baseline;
          gap: .6rem; width: 100%; white-space: normal; }
.row .t b { overflow-wrap: anywhere; }
.row .t span { white-space: nowrap; flex: none; }