/* ---------------------------------------------------------------------------
   Field-guide stylesheet for the openrouter-desktop-dash docs site.
   Dark "electronics lab" theme; accent colors mirror the dash itself
   (cyan values, green -> orange -> red budget bar).
--------------------------------------------------------------------------- */

:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --bg-raise: #11151f;
  --bg-panel: #141926;
  --line: #232b3d;
  --line-soft: #1a2131;
  --ink: #e7ecf5;
  --ink-mute: #98a4bb;
  --ink-faint: #667089;
  --cyan: #2fd8f2;
  --cyan-soft: rgba(47, 216, 242, 0.12);
  --green: #34d97b;
  --orange: #ffa02e;
  --red: #ff5d5d;
  --yellow: #f5d34c;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Space Grotesk", var(--sans);
  --radius: 14px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;  /* keep iOS Safari from inflating text when zoomed out */
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* subtle blueprint grid behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.35;
  mask-image: linear-gradient(#000 0%, transparent 42rem);
  -webkit-mask-image: linear-gradient(#000 0%, transparent 42rem);
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* height:auto keeps the width/height attributes as an aspect-ratio hint without
   pinning the rendered height — otherwise narrow viewports stretch photos vertically */
img { max-width: 100%; height: auto; display: block; border-radius: calc(var(--radius) - 4px); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 22px; position: relative; }

/* ------------------------------------------------------------------ nav -- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11, 14, 20, 0.82);
  border-bottom: 1px solid var(--line-soft);
}

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 58px;
}

.nav-logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
  white-space: nowrap;
}
.nav-logo:hover { text-decoration: none; color: var(--cyan); }
.nav-logo .tick { color: var(--cyan); }

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12.5px;
}

.nav-links a {
  color: var(--ink-mute);
  padding: 7px 11px;
  border-radius: 8px;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-panel); text-decoration: none; }
.nav-links a.active { color: var(--cyan); background: var(--cyan-soft); }
.nav-links a .n { color: var(--ink-faint); margin-right: 4px; }
.nav-links a.active .n { color: var(--cyan); }

.nav-gh { display: inline-flex; align-items: center; gap: 6px; }
.nav-gh svg { width: 15px; height: 15px; fill: currentColor; }

@media (max-width: 720px) {
  .nav-links a span.label { display: none; }        /* collapse to numbers */
  .nav-links a.nav-gh span.label { display: none; }
}
@media (max-width: 480px) {
  .nav-logo .logo-sub { display: none; }            /* just "desk-dash" on small phones */
  .nav .wrap { gap: 12px; }
  .nav-links { gap: 2px; }
  .nav-links a { padding: 7px 9px; }
}

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

.hero { padding: 72px 0 40px; position: relative; }

.kicker {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}
.kicker .chnum { color: var(--ink-faint); }

h1 {
  font-family: var(--display);
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.lede {
  font-size: clamp(17px, 2vw, 19.5px);
  color: var(--ink-mute);
  max-width: 62ch;
  margin: 0;
}
.lede strong, .lede b { color: var(--ink); }

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

section { padding: 34px 0; }

h2 {
  font-family: var(--display);
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 26px 0 10px;
}

h3 {
  font-family: var(--display);
  font-size: 20px;
  margin: 26px 0 8px;
}

p { margin: 0 0 16px; max-width: 72ch; }
p.mute, .mute { color: var(--ink-mute); }

.section-kicker {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 44px 0 -2px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-kicker::after { content: ""; height: 1px; flex: 1; background: var(--line); }

hr { border: 0; border-top: 1px solid var(--line); margin: 44px 0; }

/* ---------------------------------------------------------------- cards -- */

/* minmax(0, 1fr) everywhere: a plain 1fr track refuses to shrink below its content's
   min-width, so a wide <pre> inside a cell would push the whole page wider than the
   phone screen instead of scrolling inside its own box */
.grid { display: grid; gap: 16px; margin: 22px 0; }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: minmax(0, 1fr); }
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.card h4 {
  margin: 0 0 6px;
  font-family: var(--display);
  font-size: 16.5px;
  letter-spacing: -0.01em;
}
.card p { font-size: 14.5px; color: var(--ink-mute); margin: 0; }
.card .ic {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  display: block;
  margin-bottom: 10px;
}
.card code { color: var(--ink); }

/* spec tiles (chapter 1) */
.spec {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.spec .v {
  font-family: var(--display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: block;
}
.spec .k {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
  margin-top: 4px;
}

/* ---------------------------------------------------------------- media -- */

figure { margin: 26px 0; }
figure.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
}
figure.panel img { width: 100%; }
figcaption {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-faint);
  padding: 12px 4px 2px;
  line-height: 1.55;
}
figcaption b { color: var(--ink-mute); font-weight: 600; }

.gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 22px 0; }
@media (max-width: 700px) { .gallery { grid-template-columns: minmax(0, 1fr); } }
.gallery figure { margin: 0; }

.split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 30px; align-items: center; margin: 26px 0; }
@media (max-width: 820px) { .split { grid-template-columns: minmax(0, 1fr); } }

/* ----------------------------------------------------------------- code -- */

pre, code, kbd { font-family: var(--mono); }

code {
  font-size: 0.86em;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 6px;
}

pre {
  background: #0d111b;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
  margin: 18px 0;
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; }

pre .c  { color: var(--ink-faint); }            /* comment */
pre .p  { color: var(--cyan); }                 /* prompt / emphasis */
pre .s  { color: var(--green); }                /* string */
pre .o  { color: var(--ink-mute); }             /* output */
pre .k  { color: var(--orange); }               /* keyword-ish */

kbd {
  font-size: 12px;
  font-weight: 600;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-bottom-width: 2.5px;
  border-radius: 6px;
  padding: 3px 8px;
  white-space: nowrap;
}

/* ------------------------------------------------------------- callouts -- */

.callout {
  display: flex;
  gap: 14px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
  color: var(--ink-mute);
}
.callout.warn { border-left-color: var(--orange); }
.callout.danger { border-left-color: var(--red); }
.callout .sign {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  padding-top: 3px;
  white-space: nowrap;
}
.callout.warn .sign { color: var(--orange); }
.callout.danger .sign { color: var(--red); }
.callout p { margin: 0; }
.callout b { color: var(--ink); }

/* --------------------------------------------------------------- tables -- */

.table-scroll { overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 10px 16px; border-bottom: 1px solid var(--line-soft); }
th {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: var(--bg-panel);
}
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td.num, th.num { font-family: var(--mono); }

/* ------------------------------------------------------------ resources -- */

.resources { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 22px 0; }
@media (max-width: 700px) { .resources { grid-template-columns: minmax(0, 1fr); } }

.res {
  display: block;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 13px 16px;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.res:hover { border-color: var(--cyan); text-decoration: none; transform: translateY(-1px); }
.res .t { font-weight: 600; font-size: 15px; display: block; }
.res .t::after { content: " ↗"; color: var(--cyan); font-size: 13px; }
.res .d { font-size: 13.5px; color: var(--ink-faint); display: block; margin-top: 2px; }

/* ------------------------------------------------------- chapter covers -- */

.chapters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 26px 0; }
@media (max-width: 860px) { .chapters { grid-template-columns: minmax(0, 1fr); } }

.chapter-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.chapter-card:hover { border-color: var(--cyan); text-decoration: none; transform: translateY(-2px); }
.chapter-card img { border-radius: 0; aspect-ratio: 16 / 9.5; object-fit: cover; }
.chapter-card .body { padding: 18px 20px 20px; }
.chapter-card .num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.chapter-card h3 { margin: 6px 0 6px; font-size: 20px; }
.chapter-card p { font-size: 14px; color: var(--ink-mute); margin: 0; }
.chapter-card .go { margin-top: 12px; font-family: var(--mono); font-size: 12.5px; color: var(--cyan); }

/* ---------------------------------------------------------------- pager -- */

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 56px 0 26px;
}
.pager a {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 20px;
  color: var(--ink);
  transition: border-color 0.15s ease;
}
.pager a:hover { border-color: var(--cyan); text-decoration: none; }
.pager .dir { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); display: block; }
.pager .to { font-family: var(--display); font-weight: 600; font-size: 17px; margin-top: 4px; display: block; }
.pager .next { text-align: right; grid-column: 2; }

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

footer {
  border-top: 1px solid var(--line-soft);
  margin-top: 30px;
  padding: 30px 0 44px;
  font-size: 13px;
  color: var(--ink-faint);
}
footer p { max-width: none; margin: 0 0 6px; }

/* -------------------------------------------------------------- buttons -- */

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 6px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 600;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--bg-panel);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); border-color: var(--ink-faint); }
.btn.primary { background: var(--cyan); border-color: var(--cyan); color: #06232b; }
.btn.primary:hover { border-color: var(--cyan); filter: brightness(1.08); }

/* --------------------------------------------------- TFT device mockups -- */

.device {
  background: linear-gradient(160deg, #191d27, #10131b);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px 22px 14px;
  max-width: 520px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}
.device.small { max-width: 420px; }
.device .screen {
  background: #000;
  border-radius: 8px;
  border: 1px solid #262c3a;
  overflow: hidden;
}
.device svg { display: block; width: 100%; height: auto; }
.device .btn-row {
  display: flex;
  justify-content: center;
  gap: 64px;
  padding: 13px 0 4px;
}
.device .btn-row span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}
.device .btn-row span::before {
  content: "";
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #3a4152, #171b25 70%);
  border: 1px solid #2c3345;
}

/* SVG screen text defaults (inline SVGs inherit page CSS) */
.tft-t { font-family: var(--mono); font-weight: 700; font-size: 15px; fill: #fff; }
.tft-t.cyan { fill: var(--cyan); }
.tft-t.dim { fill: #6d7791; }
.tft-t.yellow { fill: var(--yellow); }

.device-caption {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-faint);
  margin-top: 12px;
  line-height: 1.55;
  max-width: 520px;
}
.device-caption b { color: var(--ink-mute); }

.device-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; align-items: start; margin: 26px 0; }
@media (max-width: 820px) { .device-grid { grid-template-columns: minmax(0, 1fr); } }

/* ------------------------------------------------------- diagram (SVG) -- */

.diagram {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin: 24px 0;
  overflow-x: auto;
}
.diagram svg { display: block; margin: 0 auto; min-width: 560px; width: 100%; height: auto; max-width: 860px; }

/* portrait diagrams are drawn narrow enough to fit a phone with no sideways scroll */
.diagram.portrait svg { min-width: 0; max-width: 430px; }
.diagram.portrait .dg-title { font-size: 15px; }
.diagram.portrait .dg-sub { font-size: 12.5px; }
.diagram.portrait .dg-tag { font-size: 11px; }
.diagram.portrait .dg-alabel { font-size: 11.5px; }
.diagram.portrait .dg-title.sm { font-size: 13px; }
.diagram.portrait .dg-sub.sm { font-size: 11px; }

/* landscape diagrams scroll sideways on phones — say so */
@media (max-width: 700px) {
  .diagram.wide::after {
    content: "← drag sideways to see the whole diagram →";
    display: block;
    text-align: center;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-faint);
    padding-top: 12px;
  }
}

.dg-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}
.dg-legend span { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.dg-legend span::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: #0d111b; border: 1.5px solid #2a3247; }
.dg-legend .pure::before { border-color: var(--green); }
.dg-legend .cloud::before { border-color: var(--cyan); background: #10182a; }

.dg-box { fill: #0d111b; stroke: #2a3247; rx: 10; }
.dg-box.pure { stroke: var(--green); }
.dg-box.hw { stroke: #2a3247; }
.dg-box.cloud { fill: #10182a; stroke: var(--cyan); }
.dg-title { font-family: var(--mono); font-size: 13px; font-weight: 700; fill: var(--ink); }
.dg-sub { font-family: var(--sans); font-size: 11.5px; fill: var(--ink-mute); }
.dg-tag { font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: 0.12em; }
.dg-tag.pure { fill: var(--green); }
.dg-tag.hw { fill: var(--ink-faint); }
.dg-tag.cloud { fill: var(--cyan); }
.dg-arrow { stroke: #4a5570; stroke-width: 1.6; fill: none; marker-end: url(#arr); }
.dg-line { stroke: #4a5570; stroke-width: 1.6; fill: none; }
.dg-alabel { font-family: var(--mono); font-size: 10.5px; fill: var(--ink-faint); }
.dg-n { fill: var(--cyan); font-weight: 700; }

/* --------------------------------------------------------------- steps -- */

.steps { counter-reset: step; margin: 22px 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.step {
  counter-increment: step;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px 18px 66px;
  position: relative;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 19px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}
.step h4 { margin: 0 0 6px; font-family: var(--display); font-size: 16.5px; }
.step p { font-size: 14.5px; color: var(--ink-mute); margin: 0 0 8px; }
.step p:last-child { margin-bottom: 0; }
.step pre { margin: 10px 0 0; }

/* idea chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.chip {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--ink-mute);
}
.chip b { color: var(--cyan); font-weight: 600; }

/* key-cap row for REPL shortcuts */
.keys { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 20px 0; }
@media (max-width: 700px) { .keys { grid-template-columns: minmax(0, 1fr); } }
.key-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  text-align: center;
}
.key-card kbd { font-size: 14px; }
.key-card p { font-size: 13.5px; color: var(--ink-mute); margin: 10px 0 0; }