/* shapley.si
   One page: a title and a short list, centred over a starfield.
   Two inks on black. One typeface, roman and italic. One line rhythm. */

@font-face {
  font-family: "Old Standard";
  src: url("/fonts/old-standard-regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Old Standard";
  src: url("/fonts/old-standard-italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

:root {
  --ink: #f4f4f4;    /* title and links */
  --quiet: #909090;  /* headings and what is not live yet; 6.5:1 on black */

  /* Type scales gently from a 360 px phone to a 2,560 px monitor. */
  --size: clamp(1.0625rem, 0.94rem + 0.42vw, 1.5rem);
  /* Every vertical measure on the page is a whole number of these lines. */
  --line: calc(var(--size) * 1.6);

  color-scheme: dark;
}

/* A short screen, such as a phone on its side: take the type size from the
   height instead, so the whole list still fits without scrolling. The block
   is 12 lines tall with 3 lines of padding, and 15 lines of 1.6 come to 24
   times the type size, so 4.1 per cent of the height is the most that fits. */
@supports (height: 1svh) {
  :root {
    --size: clamp(0.875rem, min(max(1.0625rem, 0.94rem + 0.42vw), 4.1svh), 1.5rem);
  }
}

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

html {
  background: #000;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  /* The title is the heaviest thing in the block and sits at its top, so the
     block is held half a line above the true centre to look centred: one line
     more padding below than above. */
  padding: var(--line) 1.25rem calc(var(--line) * 2);
  background: #000;
  color: var(--ink);
  font-family: "Old Standard", "Century Schoolbook", Century, Georgia, "Times New Roman", serif;
  font-size: var(--size);
  line-height: var(--line);
  font-kerning: normal;
  font-synthesis: none;
  /* Exact glyph positions. Without this, Chromium on Linux rounds every
     letter's advance to a whole pixel and the words come out loose and uneven
     (measured: the longest line 291 px wide instead of 272). */
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#sky {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

main {
  position: relative; /* above the sky */
  max-width: 100%;
  text-align: center;
}

h1,
h2,
ul {
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 2.2em;
  font-weight: 400;
  line-height: calc(var(--line) * 2);
  margin-bottom: var(--line);
}

h2 {
  font-size: 1em;
  font-weight: 400;
  font-style: italic;
  line-height: var(--line);
  color: var(--quiet);
  /* The italic's word space is cut wide; bring "Coming soon" together. */
  word-spacing: -0.08em;
  margin-top: var(--line);
}

ul {
  list-style: none;
}

li {
  overflow-wrap: break-word;
}

.soon {
  color: var(--quiet);
}

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.24em;
}

a:hover {
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: 0.3em;
}

::selection {
  background: var(--ink);
  color: #000;
}

/* Arrival. sky.js puts .warp on <html> for the length of the warp and takes
   it off once the list is fully there. The list comes up on a timer here
   rather than from the script, so it still appears if the script stops half
   way. Without JavaScript, with reduced motion, or on a second visit in the
   same session the class is never set and the list is simply there. Keep the
   numbers in step with LIST_DELAY, LIST_FADE and SKIP_FADE in sky.js. */
.warp main {
  opacity: 0;
  animation: arrive 1100ms cubic-bezier(0.3, 0, 0.3, 1) 1500ms forwards;
}

/* The visitor skipped before the list had begun to appear: bring it up now.
   A second set of keyframes, because changing the timing of a running
   animation would not restart it. */
.warp.skip main {
  animation: arrive-now 260ms ease-out forwards;
}

@keyframes arrive {
  to {
    opacity: 1;
  }
}

@keyframes arrive-now {
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .warp main,
  .warp.skip main {
    opacity: 1;
    animation: none;
  }
}