/* quilon.run — coming soon. No framework, no build step. */

:root {
  /* Claret, light. One value drives every accent on the page. */
  --claret: #a2194f;

  --bg: #fbfaf8;
  --code-bg: #f4f2ef;
  --fg: #1a1a1c;
  --fg-dim: #6b6b70;
  --border: #e4e1dc;

  /* Code colours are a claret ramp, not a rainbow — the sample should read as
     part of the page. Every one clears 4.5:1 on --code-bg. */
  --bordeaux: #6e1230;
  --rose: #8a3d5c;
  --mauve: #7a4a63;

  --qn-operator: var(--claret);   /* = := -> => |> :: ? | / */
  --qn-control: var(--claret);    /* ^ << >> */
  --qn-type: var(--bordeaux);     /* Num, Text, Shape */
  --qn-const: var(--rose);        /* $ Ok NotOk */
  --qn-number: var(--rose);
  --qn-string: var(--mauve);
  --qn-name: var(--fg);           /* declared names stay plain */
  --qn-comment: #6e6a61;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  display: grid;
  place-items: center;
  padding: 3rem 1.5rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  width: 100%;
  max-width: 40rem;
  text-align: center;
}

h1 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  margin: 0 0 1.25rem;
  font-size: clamp(2.5rem, 9vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

h1 span {
  color: var(--claret);
}

h1 img {
  width: clamp(2.5rem, 9vw, 3.25rem);
  height: clamp(2.5rem, 9vw, 3.25rem);
  border-radius: 14px;
  flex: none;
}

.tagline {
  margin: 0 auto 0.6rem;
  max-width: 31rem;
  color: var(--fg);
  font-size: 1.05rem;
  text-wrap: balance;
}

.tagline em,
.tagline b {
  color: var(--claret);
  font-weight: inherit;
}

.tagline em {
  font-style: italic;
}

/* The one coloured word in the sentence is "Colorless". That is the joke. */
.subline b {
  color: var(--claret);
  font-weight: inherit;
}

.subline {
  margin: 0 auto 2.5rem;
  max-width: 31rem;
  color: var(--fg-dim);
  font-size: 0.9rem;
  text-wrap: balance;
}

.examples {
  margin: 0 0 2.5rem;
}

/* Radio + label tabs. No JavaScript, and no #hash — an anchor would make the
   browser scroll the document to the slide, which jumps the page. Radios also
   give arrow-key navigation for free. */

.examples input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.picker {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.picker label {
  padding: 0.3rem 0.7rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--fg-dim);
  font-size: 0.8rem;
  cursor: pointer;
}

.picker label:hover {
  color: var(--fg);
  background: var(--code-bg);
}

/* Panels are stacked in one grid cell, so the box is always as tall as the
   tallest example and switching never shifts the page. */
.panels {
  display: grid;
}

.panel {
  grid-area: 1 / 1;
  visibility: hidden;
}

#ex-1:checked ~ .picker label[for="ex-1"],
#ex-2:checked ~ .picker label[for="ex-2"],
#ex-3:checked ~ .picker label[for="ex-3"],
#ex-4:checked ~ .picker label[for="ex-4"],
#ex-5:checked ~ .picker label[for="ex-5"] {
  color: var(--claret);
  border-color: var(--border);
  background: var(--code-bg);
}

#ex-1:focus-visible ~ .picker label[for="ex-1"],
#ex-2:focus-visible ~ .picker label[for="ex-2"],
#ex-3:focus-visible ~ .picker label[for="ex-3"],
#ex-4:focus-visible ~ .picker label[for="ex-4"],
#ex-5:focus-visible ~ .picker label[for="ex-5"] {
  outline: 2px solid var(--claret);
  outline-offset: 2px;
}

#ex-1:checked ~ .panels .panel:nth-child(1),
#ex-2:checked ~ .panels .panel:nth-child(2),
#ex-3:checked ~ .panels .panel:nth-child(3),
#ex-4:checked ~ .panels .panel:nth-child(4),
#ex-5:checked ~ .panels .panel:nth-child(5) {
  visibility: visible;
}

pre {
  flex: 1;
}

/* The picker. Plain anchors, so it works in every browser — ::scroll-marker is
   Chrome-only today, and a control nobody else can see is not a control. */
.picker {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.picker a {
  padding: 0.3rem 0.7rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--fg-dim);
  font-size: 0.8rem;
  text-decoration: none;
}

.picker a:hover {
  color: var(--fg);
  background: var(--code-bg);
}

.picker a:focus-visible {
  outline: 2px solid var(--claret);
  outline-offset: 2px;
}

/* :target marks the slide the URL points at, so the label lights up with it. */
.examples li:target ~ .picker a,
.picker a:active {
  color: var(--fg-dim);
}

pre {
  margin: 0;
  padding: 1.35rem 1.5rem;
  overflow-x: auto;
  text-align: left;
  line-height: 1.7;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}

code {
  font-family: "Fira Code", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, monospace;
  font-size: 0.85rem;
  /* Quilon is made of => -> |> :: := <= — the ligatures are the point. */
  font-variant-ligatures: contextual common-ligatures;
}

.release {
  margin: 0 0 1rem;
}

.pill {
  display: inline-block;
  padding: 0.55rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--claret);
  color: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.825rem;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.pill:hover {
  background: #8c1444;
}

.pill:active {
  transform: translateY(1px);
}

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

@media (prefers-reduced-motion: no-preference) {
  .pill {
    transition: background-color 0.15s ease;
  }
}

.soon {
  margin: 0 0 2.5rem;
  color: var(--fg-dim);
  font-size: 0.85rem;
}

.links {
  margin: 0;
  color: var(--border);
  font-size: 0.9rem;
}

.links a {
  color: var(--fg-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  margin: 0 0.35rem;
}

.links a:hover,
.links a:focus-visible {
  color: var(--fg);
  border-bottom-color: var(--claret);
}

.links a:focus-visible {
  outline: 2px solid var(--claret);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- syntax highlighting ---- */

.qn-comment {
  color: var(--qn-comment);
  font-style: italic;
}
.qn-string {
  color: var(--qn-string);
}
.qn-number {
  color: var(--qn-number);
}
.qn-const {
  color: var(--qn-const);
}
.qn-operator {
  color: var(--qn-operator);
}
.qn-control {
  color: var(--qn-control);
}
.qn-type {
  color: var(--qn-type);
}
.qn-name {
  color: var(--qn-name);
}