/* Diag: desktop typography and controls in the original Pi diagnostic layout.
 * Terminess is self-hosted; see fonts/Terminess-LICENSE.txt. */
@font-face {
  font-family: "Terminess Nerd Font Mono";
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  src: url("/fonts/terminess-nerd-font-mono-regular.woff2") format("woff2");
}

/* Keep the diagnostic key column aligned across heading font sizes. */
@property --kw { syntax: "<length>"; inherits: true; initial-value: 0px; }

:root {
  color-scheme: dark;
  --bg: #000000; --ink: #e8e8e8; --dim: #8c8c8c; --faint: #4a4a4a; --row: #141414;
  --rasp: #e0306a; --leaf: #75c94d; --amber: #ffb000; --sky: #6ec6ff;
  --mono: "Terminess Nerd Font Mono", ui-monospace, monospace;
  --unit: 4px;
  --key: 9ch; --gap: 1ch; --kw: calc(var(--key) + var(--gap));
  --pad: clamp(16px, 4vw, 32px);
}

/* Base: stable geometry, opaque surfaces, colour-only interaction. */
*, *::before, *::after { box-sizing: border-box; }
html {
  background: var(--bg); color: var(--ink);
  font: 400 18px/1.5 var(--mono);
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--faint) var(--bg);
}
body { max-width: calc(92ch + 2 * var(--pad)); margin: 0 auto; padding: 0 var(--pad); }
img, video { max-width: 100%; height: auto; }
h1, h2, p, li, dd { overflow-wrap: anywhere; }
p { margin: 0 0 .8em; max-width: 72ch; }
code, pre { font: inherit; font-family: var(--mono); }
code { color: var(--amber); }
pre { max-width: 100%; overflow-x: auto; }
::selection { background: var(--rasp); color: var(--bg); }
a { color: var(--leaf); text-decoration: none; text-underline-offset: 4px; }
a:hover { background: var(--row); text-decoration: underline; }
a:focus-visible { background: var(--row); outline: 2px solid var(--leaf); outline-offset: 3px; }
a, .entries li, .parts tbody tr, .bar i {
  transition: color 120ms ease-out, background-color 120ms ease-out, border-color 120ms ease-out;
}
.skip-link { position: absolute; top: 8px; left: var(--pad); padding: 4px 1ch; background: var(--bg); border: 1px solid var(--leaf); transform: translateY(-200%); z-index: 1; }
.skip-link:focus { transform: none; }
.site-header ul, .site-footer ul, .entries, .pipeline { list-style: none; margin: 0; padding: 0; }
.site-header nav ul, .site-footer ul { display: flex; flex-wrap: wrap; }

/* Diagnostic lines keep the original key/value structure. */
.diag { margin: 0; display: grid; row-gap: var(--unit); }
.diag div { display: grid; grid-template-columns: var(--key) minmax(0, 1fr); column-gap: var(--gap); }
.diag div:has(dd:empty) { display: none; }
.diag dt { color: var(--rasp); }
.diag dt::after { content: ":"; color: var(--leaf); }
.diag dd { margin: 0; min-width: 0; }
.diag ul { display: flex; flex-wrap: wrap; gap: 0 2ch; margin: 0; padding: 0; list-style: none; }

/* Original header: full-size Pi, board diagnostics, arrow links and QR. */
.site-header { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; column-gap: 2ch; align-items: center; padding: 1.75rem 0 2rem; border-bottom: 6px double var(--faint); }
/* logo, text block and QR share one height: --hh, 3 px per logo pixel */
.site-header { --hh: 138px; }
.logo { grid-column: 1; grid-row: 1 / 3; width: auto; max-width: none; height: var(--hh); image-rendering: pixelated; }
.release { grid-column: 2; grid-row: 1; align-self: start; margin: 0; color: var(--dim); }
.site-header .diag { grid-column: 2; grid-row: 2; align-self: end; margin: 0; }
.site-header .diag div { grid-template-columns: 7ch minmax(0, 1fr); }
.release, .site-header .diag { font-size: 1.4em; line-height: 1.35; }  /* three lines, as tall as the logo */
.brand { color: var(--ink); }  /* the board name stays white, raspberry on hover */
.brand:hover, .brand:focus-visible { background: none; color: var(--rasp); }
.site-header nav ul { gap: 0; }
.site-header nav li + li::before { content: "\2192"; margin: 0 1ch; color: var(--faint); }
.site-header nav a[aria-current] { background: var(--leaf); color: var(--bg); text-decoration: none; }
.qr { grid-column: 3; grid-row: 1 / 3; display: grid; justify-items: center; gap: .15rem; text-decoration: none; font-size: .8em; }
.qr { position: relative; }
.qr img { display: block; width: var(--hh); height: var(--hh); image-rendering: pixelated; }
.qr span { position: absolute; top: 100%; right: 0; left: 0; width: max-content; margin: 0 auto; }
.qr:hover, .qr:focus-visible { background: none; }
.qr:hover span, .qr:focus-visible span { background: var(--leaf); color: var(--bg); text-decoration: none; }


/* Original open headings with a raspberry lead-in and grey trailing rule. */
main { padding: 24px 0 40px; }
h1 { margin: 0 0 16px; padding-left: var(--kw); font-size: 1.4em; font-weight: 400; line-height: 1.2; text-wrap: balance; }
/* section headings: a raspberry rule through the key column, the name in caps, a faint rule to the edge */
h2, .body h1, .hero h1 {
  display: flex; flex-wrap: wrap; align-items: center; gap: .2rem var(--gap); margin: 2.25rem 0 .7rem; padding: 0;
  color: var(--ink); font-size: 1em; font-weight: 400; line-height: 1.3; text-transform: uppercase; letter-spacing: .06em;
}
h2::before, .body h1::before, .hero h1::before { content: ""; flex: 0 0 var(--key); height: 2px; background: var(--rasp); }
h2::after, .body h1::after, .hero h1::after { content: ""; order: 1; flex: 1 1 2ch; height: 2px; background: var(--faint); }
h2 .state { order: 2; margin-left: auto; letter-spacing: 0; }

.hero h1 { margin-top: 0; }
.meta { margin-bottom: 24px; }
.meta dd { color: var(--dim); }

/* Posts: the same text column, with a square frame around code. */
.body > :not(h1) { margin-left: var(--kw); }
.body ul, .body ol { padding-left: 2ch; }
.body li + li { margin-top: 4px; }
.body pre {
  position: relative; margin: 16px 0 16px var(--kw); padding: 12px 16px;
  background: var(--row); border: 1px solid var(--faint); border-left: 2px solid var(--rasp);
  overflow: visible;
}
.body pre::before { content: "code:"; position: absolute; top: 12px; left: calc(-1 * var(--kw) - 2px); color: var(--rasp); }
.body pre code { display: block; overflow-x: auto; color: var(--ink); }
.eof { margin: 32px 0 0; padding-left: var(--kw); color: var(--dim); }

/* File rows: quiet separators and a fixed-width action cell. */
.entries { border-top: 1px solid var(--faint); }
.entries li {
  position: relative; display: grid;
  grid-template-columns: var(--key) minmax(0, 1fr) auto;
  column-gap: var(--gap); padding: 12px 0;
  border-bottom: 1px solid var(--faint);
}
.entries li::before { content: "file:"; grid-row: 1 / span 3; color: var(--rasp); }
.entries time, .entries a, .entries p { grid-column: 2; }
.entries time, .entries p { color: var(--dim); }
.entries p { grid-column: 2 / -1; margin: 4px 0 0; }
.entries a { width: fit-content; }
.entries a::after { content: ""; position: absolute; inset: 0; }
.entries a:focus-visible { outline: none; }
.entries li:focus-within { outline: 2px solid var(--leaf); outline-offset: 2px; }
.entries li:hover, .entries li:focus-within { background: var(--row); }
.entries li::after {
  content: "[open]"; grid-column: 3; grid-row: 1;
  padding: 0 1ch; color: var(--dim);
}
.entries li:hover::after, .entries li:focus-within::after { color: var(--leaf); }

/* Telemetry uses the same thin, segmented meters as the shell. */
.state { color: var(--leaf); text-transform: uppercase; font-size: .9em; }
.state::before { content: "["; }
.state::after { content: "]"; }
.state.down { color: var(--rasp); }
.meters { display: grid; gap: 8px; }
.meter { --fill: 0%; display: grid; grid-template-columns: var(--key) 8ch minmax(0, 1fr); gap: 4px var(--gap); align-items: center; }
.meter .lbl { color: var(--rasp); }
.meter .lbl::after { content: ":"; color: var(--leaf); }
.meter .val { font-variant-numeric: tabular-nums; }
.meter:has(.note) { grid-template-columns: var(--key) minmax(0, 1fr) auto; }
.meter .note { color: var(--dim); }
.bar {
  position: relative; height: 12px; border: 1px solid var(--faint);
  background: repeating-linear-gradient(90deg, transparent 0 calc(10% - 1px), var(--row) 0 10%);
}
.bar i {
  position: absolute; inset: 2px;
  background: var(--leaf); clip-path: inset(0 calc(100% - var(--fill)) 0 0);
}
.meter.hot .bar i { background: var(--amber); }
.meter.hot .val { color: var(--amber); }
.source { margin-top: 12px; color: var(--dim); font-size: .9em; }
.source dt, .source code { color: var(--dim); }

/* Partition table: one-pixel rules, numbered rows and status markers. */
.parts { width: 100%; border-collapse: collapse; }
.parts th { padding: 4px var(--gap) 8px 0; color: var(--rasp); font-weight: 400; text-align: left; border-bottom: 1px solid var(--faint); }
.parts td { padding: 8px var(--gap) 8px 0; vertical-align: baseline; color: var(--dim); border-bottom: 1px solid var(--row); }
.parts th:first-child, .parts td:first-child { width: var(--kw); }
.parts td:nth-child(2) { width: 12ch; color: var(--ink); }
.parts th:last-child, .parts td:last-child { width: 8ch; padding-right: 0; text-align: right; text-transform: uppercase; }
.parts .using { color: var(--leaf); }
.parts .learning { color: var(--amber); }
.parts .next { color: var(--dim); }
.parts td:first-child { padding-left: .75ch; box-shadow: inset 2px 0 var(--faint); }
.parts tr:has(.using) td:first-child { box-shadow: inset 2px 0 var(--leaf); }
.parts tr:has(.learning) td:first-child { box-shadow: inset 2px 0 var(--amber); }
.parts tbody tr:hover { background: var(--row); }

/* Boot sequence keeps its original order and diagnostic vocabulary. */
.pipeline { counter-reset: step; }
.pipeline li {
  counter-increment: step; display: grid;
  grid-template-columns: var(--key) 7ch minmax(0, 1fr) auto;
  gap: 4px var(--gap); align-items: baseline;
  padding: 8px 0; border-bottom: 1px solid var(--row);
}
.pipeline li::before { content: "0" counter(step); color: var(--rasp); }
.pipeline .step { color: var(--sky); text-transform: uppercase; }
.pipeline .what { color: var(--dim); min-width: 0; }
.pipeline .res { color: var(--leaf); }
.pipeline li:last-child .what { color: var(--ink); }
.pipeline li:last-child .res { padding: 0 .5ch; background: var(--leaf); color: var(--bg); }
.site-footer { padding: 24px 0 32px; border-top: 1px solid var(--faint); color: var(--dim); }

/* Narrow displays keep the content order; only the columns collapse. */
@media (max-width: 42em) {
  :root { --key: 6ch; --pad: 16px; }
  html { font-size: 18px; }
  .site-header { --hh: 69px; column-gap: 1ch; padding: 1rem 0; }
  .site-header .diag { font-size: .85em; }
  .site-header .diag div { grid-template-columns: 6.5ch minmax(0, 1fr); }
  .release { font-size: .78em; }
  .qr span { display: none; }
  main { padding-top: 16px; }
  h1 { padding-left: 0; font-size: 1.3em; }
  h2::before, .body h1::before, .hero h1::before { flex-basis: 2ch; }
  .body > :not(h1), .body pre { margin-left: 0; }
  .body pre::before { content: none; }
  .eof { padding-left: 0; }
  .meter, .meter:has(.note) { grid-template-columns: var(--key) minmax(0, 1fr); }
  .meter .val { text-align: right; }
  .bar { grid-column: 1 / -1; }
  .meter .note { grid-column: 2; text-align: right; }
  .parts thead { display: none; }
  .parts, .parts tbody { display: block; }
  .parts tr { display: grid; grid-template-columns: 4ch minmax(0, 1fr) auto; gap: 4px var(--gap); padding: 8px 0; border-bottom: 1px solid var(--row); }
  .parts td { padding: 0; border: 0; width: auto !important; }
  .parts td:nth-child(3) { grid-column: 2 / -1; grid-row: 2; }
  .parts td:last-child { grid-column: 3; grid-row: 1; }
  .pipeline li { grid-template-columns: 3ch minmax(0, 1fr) auto; }
  .pipeline .what { grid-column: 2 / -1; grid-row: 2; }
  .pipeline .res { grid-column: 3; grid-row: 1; }
  .entries li { grid-template-columns: var(--key) minmax(0, 1fr); }
  .entries li::after { content: none; }
}
@media (pointer: coarse) {
  .site-header nav a { display: inline-block; padding-block: 8px; }
  .site-footer a { display: inline-block; padding-block: 8px; }
  .entries li { min-height: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}