/* The spine — rack unit.
 *
 * The two editions are dressed up 28 different ways; this is the one surface
 * that cannot be. Two earlier attempts got it wrong in opposite directions:
 * the first was neutral to the point of looking unfinished, the second borrowed
 * the birthday theme's cream and pink and so competed with the themes on colour
 * while looking related to exactly one of them.
 *
 * This takes a third position. The chrome is monochrome instrument hardware and
 * is deliberately colour-blind — greys plus one amber signal, and amber only
 * ever means live, selected or interactive. So any colour on the page belongs
 * to a theme, which is what a page full of scaled-down theme previews needs. It
 * reads as designed rather than absent because the material has weight: bevels,
 * bolt heads, engraved labels.
 *
 * Reference: refs/Spine Directions.html, turn 2, option 2b. Spec in 06-spine.md.
 */

@import url('https://fonts.googleapis.com/css2?family=Saira+Condensed:wght@500;600;700&family=Saira:wght@400;500;600&family=DM+Mono:wght@400;500&display=swap');

:root {
  --chassis:       #e6e5e0;
  --chassis-grain: repeating-linear-gradient(90deg, rgba(0,0,0,.022) 0 1px, transparent 1px 3px);
  --panel:         #f5f4f0;
  --panel-sunk:    #d5d4ce;
  --edge:          #c4c3bd;
  --edge-strong:   #b7b6b0;
  --screw:         radial-gradient(circle at 35% 30%, #e8e7e2, #9a9994);
  --ink:           #1c1d1a;
  --ink-2:         rgba(28,29,26,.78);
  --ink-3:         rgba(28,29,26,.72);
  --plate:         #1c1d1a;
  --plate-ink:     #e9eae5;
  --signal:        #e0850b;   /* fills, dots, text on dark ground */
  --signal-ink:    #8a5200;   /* amber as text on a light ground */
  --font-head: 'Saira Condensed', system-ui, sans-serif;
  --font-body: 'Saira', system-ui, sans-serif;
  --font-mono: 'DM Mono', ui-monospace, monospace;
}

/* Dark is not an inversion. Light is brushed aluminium, dark is anodized
   black — two materials, one instrument. */
@media (prefers-color-scheme: dark) {
  :root {
    --chassis:     #131412;
    --panel:       #1e201d;
    --panel-sunk:  #1a1c19;
    --edge:        #2a2c28;
    --edge-strong: #3a3d37;
    --screw:       radial-gradient(circle at 35% 30%, #55574f, #24261f);
    --ink:         #e9eae5;
    --ink-2:       rgba(233,234,229,.82);
    --ink-3:       rgba(233,234,229,.70);
    --plate:       #0a0b0a;
    --plate-ink:   #e9eae5;
    --signal:      #e0850b;
    --signal-ink:  #e0850b;
  }
}

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

body {
  margin: 0;
  background: var(--chassis);
  background-image: var(--chassis-grain);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 62rem; margin: 0 auto; padding: 0 1.5rem; }

/* ── Nav ───────────────────────────────────────────────────────────────────*/

.site-nav {
  /* Not a fixed height: between the 640px breakpoint and about 735px the
     one-line nav did not fit and the whole page scrolled sideways. Wrapping is
     allowed at every width now, so there is no band where it can overflow. */
  min-height: 48px;
  background: var(--plate);
  color: var(--plate-ink);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  min-height: 48px;
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--plate-ink);
  text-decoration: none;
  margin-right: auto;
  align-self: stretch;
}

.site-nav__brand::before {
  content: "YVN";
  border: 1px solid rgba(233,234,229,.5);
  padding: 3px 6px;
  font: 500 10px/1 var(--font-mono);
  letter-spacing: 0;
}

.site-nav a:not(.site-nav__brand) {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: rgba(233,234,229,.72);
  text-decoration: none;
  line-height: 48px;
}

.site-nav a:not(.site-nav__brand):hover { color: var(--plate-ink); }

.site-nav a[aria-current="page"] {
  color: var(--plate-ink);
  box-shadow: inset 0 -2px 0 var(--signal);
}

/* Status lamp and the site's own version, far right behind a divider. */
.site-nav__status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding-left: 18px;
  border-left: 1px solid rgba(233,234,229,.18);
  font: 400 10.5px/1 var(--font-mono);
  color: rgba(233,234,229,.75);
}

.site-nav__led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 7px var(--signal);
  animation: yvn-blink 2.4s infinite;
}

@keyframes yvn-blink { 0%,45% { opacity: 1 } 55%,100% { opacity: .35 } }

@media (prefers-reduced-motion: reduce) {
  .site-nav__led { animation: none; }
}

@media (max-width: 767px) {
  /* Every one of these links used to be display:none below 640px, and the rule
     that revealed them again pointed at a .site-nav__menu that was never built
     in any page -- so on a phone the nav was the wordmark and nothing else, and
     Birthday, Work, Cards, Examples, Themes and About were all unreachable from
     it. They wrap onto a second row now: no disclosure state, nothing to
     script, nothing that can fail to open. */
  .site-nav__inner {
    column-gap: 0.7rem;
    row-gap: 0;
    padding-top: 0.4rem;
    padding-bottom: 0.45rem;
  }

  .site-nav__brand { order: 0; min-height: 28px; }
  .site-nav__status { order: 1; }

  /* A full-width item of no height, which cannot share the first row and so
     pushes the links onto their own. */
  .site-nav__inner::after {
    content: "";
    order: 2;
    flex: 1 0 100%;
  }

  .site-nav a:not(.site-nav__brand) {
    order: 3;
    font-size: 11px;
    line-height: 2.5;
  }
}

/* ── Prose ─────────────────────────────────────────────────────────────────*/

main.wrap { padding-top: 2.5rem; padding-bottom: 3.5rem; }

h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: .02em;
  text-transform: uppercase;
  text-wrap: balance;
}

h2 {
  margin: 2.75rem 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h3 {
  margin: 0 0 0.25rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .11em;
  text-transform: uppercase;
}

p { margin: 0.85rem 0; max-width: 68ch; }

.lede { font-size: 1.1rem; color: var(--ink-2); max-width: 60ch; margin-bottom: 1.75rem; }

a { color: var(--ink); text-decoration-color: var(--signal-ink); text-underline-offset: .18em; }
a:hover { color: var(--signal-ink); }

code { font-family: var(--font-mono); font-size: .88em; background: var(--panel-sunk); padding: .08em .35em; }

/* ── Panel ─────────────────────────────────────────────────────────────────*/

.panel {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 3px;
  box-shadow: inset 0 1px 0 #fff, 0 1px 2px rgba(0,0,0,.09);
}

@media (prefers-color-scheme: dark) {
  .panel { box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 1px 2px rgba(0,0,0,.4); }
}

.panel__label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 9px 14px;
  border-bottom: 1px solid var(--edge);
  font: 600 10.5px/1 var(--font-head);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.panel__live { color: var(--signal-ink); }
.panel__body { padding: 1.1rem 1.2rem 1.25rem; }

/* ── Buttons ───────────────────────────────────────────────────────────────*/

.btn {
  display: inline-block;
  padding: 0.75rem 1.2rem;
  min-height: 44px;
  border: 0;
  border-radius: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
}

.btn--primary { background: var(--ink); color: var(--panel); }
.btn--secondary { background: transparent; color: var(--ink); border: 1px solid var(--edge-strong); }
.btn:hover { border-color: var(--signal); color: var(--signal-ink); }
.btn--primary:hover { background: var(--ink); color: var(--panel); box-shadow: inset 0 -3px 0 var(--signal); }
.btn:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

/* Links had no author focus style at all, so keyboard users got whatever the
   browser drew -- including over the dark nav plate, where the default ring is
   least dependable. One signal colour everywhere. */
a:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
.site-nav a:focus-visible { outline-color: var(--signal); outline-offset: -2px; }

/* ── Landing hero ──────────────────────────────────────────────────────────*/

.hero__grid { display: grid; gap: 1px; background: var(--edge); }

@media (min-width: 860px) {
  .hero__grid { grid-template-columns: minmax(0, 1fr) 300px; }
}

.hero__main, .hero__fields { background: var(--panel); padding: 1.25rem 1.4rem 1.5rem; }

.hero__kicker {
  font: 600 10.5px/1 var(--font-head);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.6rem;
}

.hero__vnum {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(3rem, 9vw, 5.25rem);
  letter-spacing: -.045em;
  line-height: 1;
  margin: 0 0 0.75rem;
}

.hero__lede { max-width: 44ch; color: var(--ink-2); margin: 0 0 1.25rem; }
.hero__actions { display: flex; gap: 0.6rem; flex-wrap: wrap; }

.hero__fields { display: grid; gap: 1px; background: var(--edge); padding: 0; }

.field {
  background: var(--panel);
  padding: 0.7rem 1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.field__label { font: 600 10px/1.4 var(--font-head); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); }
.field__value { font: 500 15px/1 var(--font-mono); }
.field--dark { background: var(--plate); color: var(--plate-ink); }
.field--dark .field__label { color: rgba(233,234,229,.62); }
.field--dark .field__value { color: var(--signal); }

/* ── Edition cards ─────────────────────────────────────────────────────────*/

.editions { display: grid; gap: 1rem; margin: 1.5rem 0 0; padding: 0; list-style: none; }
@media (min-width: 720px) { .editions { grid-template-columns: 1fr 1fr; } }

.edition {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 3px;
  overflow: hidden;
}

.edition:hover { border-color: var(--signal); color: inherit; }

.edition__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 10px 14px;
  background: var(--plate);
  color: var(--plate-ink);
  font: 700 13px/1 var(--font-head);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.edition__slot { font: 400 10px/1 var(--font-mono); color: var(--signal); letter-spacing: 0; }
.edition__body { padding: 1rem 1.1rem; }
.edition__body p { margin: 0; color: var(--ink-2); max-width: none; }

.edition__foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  border-top: 1px solid var(--edge);
  font: 400 10.5px/1 var(--font-mono);
  color: var(--ink-3);
}

/* ── Rack rows: themes and examples ────────────────────────────────────────*/

.rack { display: grid; gap: 1px; background: var(--edge); margin: 1.5rem 0 0; padding: 0; list-style: none; }

.rack__row {
  display: grid;
  grid-template-columns: 322px minmax(0, 1fr);
  gap: 22px;
  padding: 16px 24px;
  background: var(--panel);
  align-items: start;
}

@media (max-width: 720px) {
  .rack__row { grid-template-columns: minmax(0, 1fr); gap: 14px; }
}

/* A screen in a bezel. The frame is the only chrome the preview gets, and it
   never takes a colour from the theme inside it. */
.rack__screen {
  position: relative;
  width: 100%;
  max-width: 322px;
  aspect-ratio: 322 / 180;
  overflow: hidden;
  border: 1px solid #4a4b46;
  box-shadow: inset 0 0 12px rgba(0,0,0,.5);
  background: var(--panel-sunk);
}

@media (prefers-color-scheme: dark) { .rack__screen { border-color: #000; } }

.rack__screen iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 1000px;
  height: 560px;
  border: 0;
  transform-origin: top left;
  transform: scale(var(--preview-scale, .322));
}

.rack__plate { display: flex; flex-direction: column; gap: 0.5rem; }

.rack__head { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }

.rack__led {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--signal); box-shadow: 0 0 6px var(--signal);
  flex: none;
}

.rack__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 25px;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.rack__unit { font: 400 10px/1 var(--font-mono); color: var(--ink-3); }
.rack__blurb { margin: 0; color: var(--ink-2); font-size: 0.95rem; max-width: 52ch; }

.rack__chips { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.chip {
  border: 1px solid var(--edge-strong);
  padding: 2px 7px;
  font: 400 10px/1.6 var(--font-mono);
  color: var(--ink-3);
}

.rack__actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.2rem; }
.rack__actions .btn { padding: 0.5rem 0.9rem; min-height: 36px; font-size: 11px; }
/* The compact rack button is a mouse affordance. On touch it goes back to the
   44px floor -- 36px is under the 24px AA minimum's comfortable margin and
   these are the primary way into a theme. */
@media (pointer: coarse) {
  .rack__actions .btn { min-height: 44px; }
}

.rack__roster {
  margin: 0;
  font: 400 11px/1.9 var(--font-mono);
  color: var(--ink-3);
}

/* One inline field, no panel, no ceremony. */
.dateline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 0;
  font: 600 10.5px/1 var(--font-head);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.dateline input {
  font: 400 14px/1 var(--font-mono);
  padding: 0.6rem 0.7rem;
  min-height: 44px;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--edge-strong);
  border-radius: 0;
}

.dateline input:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

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

.site-foot { border-top: 1px solid var(--edge); }

.site-foot__inner {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1.25rem 0 2.5rem;
  font: 400 10.5px/1.9 var(--font-mono);
  color: var(--ink-3);
}

.site-foot p { margin: 0; max-width: 52ch; }
.site-foot a { color: var(--ink-3); }