/* matisa.westopp.com — one page, no JavaScript, no webfont, no dependencies.
   Every effect here is CSS: the aurora is two blurred radial gradients on a slow
   drift, the grain is an inline SVG turbulence filter, the entrance is staggered
   animation-delay. Nothing waits on a network request to look finished, which is
   the only reason a download page exists at all.

   The palette is the app's dark theme, so the site and the thing it hands you
   are recognisably one product. */

:root {
  color-scheme: dark;

  --void: #08080a;
  --text: oklch(0.975 0.002 288);
  --muted: oklch(0.72 0.008 288);
  --dim: oklch(0.52 0.012 288);
  --rule: oklch(1 0 0 / 0.08);

  /* Taken from the app icon rather than chosen beside it: icon.json composites
     the mark over a display-p3 blue, and this is that blue. The site and the
     thing it hands you should read as one object. */
  --brand: #0a63b8;
  --brand-lift: #1a7ad4;
  --glow: oklch(0.58 0.16 250 / 0.5);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;

  --frame: clamp(0.75rem, 2.2vw, 2rem);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--void);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  display: grid;
  place-items: center;
  position: relative;
}

/* ── Aurora ──────────────────────────────────────────────────────────────────
   Two blobs, counter-drifting on a minute-long cycle. Slow enough that it reads
   as light rather than animation — you notice it only if you stay. */
.aurora {
  position: fixed;
  inset: -30%;
  z-index: 0;
  pointer-events: none;
  filter: blur(80px) saturate(130%);
}

.aurora::before,
.aurora::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.aurora::before {
  width: 52vw;
  height: 52vw;
  top: 8%;
  left: 22%;
  background: radial-gradient(circle, oklch(0.54 0.17 253 / 0.55), transparent 62%);
  animation: drift-a 46s ease-in-out infinite;
}

.aurora::after {
  width: 44vw;
  height: 44vw;
  bottom: 6%;
  right: 18%;
  background: radial-gradient(circle, oklch(0.6 0.11 215 / 0.34), transparent 62%);
  animation: drift-b 62s ease-in-out infinite;
}

@keyframes drift-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(9vw, 6vh, 0) scale(1.12); }
}

@keyframes drift-b {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1.06); }
  50% { transform: translate3d(-8vw, -7vh, 0) scale(0.94); }
}

/* ── Grain ───────────────────────────────────────────────────────────────────
   The thing that stops a dark gradient looking like a dark gradient. Fixed, so
   it does not swim when anything moves beneath it. */
.grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── Frame ───────────────────────────────────────────────────────────────────
   A hairline inset rectangle with the corners cut away, so the eye reads four
   brackets rather than a box. Cheap structure, and it makes the viewport feel
   composed rather than filled. */
.frame {
  position: fixed;
  inset: var(--frame);
  z-index: 1;
  pointer-events: none;
  border: 1px solid var(--rule);
  -webkit-mask:
    linear-gradient(#000 0 0) padding-box,
    linear-gradient(to right, #000 0 18%, transparent 18% 82%, #000 82% 100%),
    linear-gradient(to bottom, #000 0 18%, transparent 18% 82%, #000 82% 100%);
  -webkit-mask-composite: source-in;
  mask:
    linear-gradient(to right, #000 0 18%, transparent 18% 82%, #000 82% 100%),
    linear-gradient(to bottom, #000 0 18%, transparent 18% 82%, #000 82% 100%);
  mask-composite: intersect;
}

/* ── Content ─────────────────────────────────────────────────────────────────*/
main {
  position: relative;
  z-index: 3;
  width: min(46rem, 100% - calc(var(--frame) * 4));
  text-align: center;
  display: grid;
  justify-items: center;
}

.logo {
  width: clamp(4.5rem, 8vw, 6.5rem);
  height: auto;
  /* The icon is a rounded square with its own depth, so it gets a cast shadow
     and a bloom rather than the flat glow a flat mark wanted. */
  filter: drop-shadow(0 14px 34px oklch(0 0 0 / 0.55)) drop-shadow(0 0 40px var(--glow));
}

h1 {
  margin: clamp(1.5rem, 3.5vw, 2.5rem) 0 0;
  font-size: clamp(3.5rem, 13vw, 9.5rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.86;
  /* A gradient that fades the word into the canvas at its feet, so the type
     sits in the light rather than on top of it. */
  background: linear-gradient(175deg, var(--text) 32%, oklch(0.62 0.012 288) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  max-width: 28rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.5vw, 1.0625rem);
  line-height: 1.55;
  text-wrap: balance;
}

/* The one control on the page. Saturated, not the pale status green — this is a
   thing you press, not a thing being reported. The sheen sweeps once on hover. */
.download {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding: 1rem 2.5rem;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  overflow: hidden;
  box-shadow: 0 0 0 1px oklch(1 0 0 / 0.08) inset, 0 12px 40px -12px var(--glow);
  transition: background 160ms ease, transform 160ms ease, box-shadow 240ms ease;
}

.download::after {
  content: "";
  position: absolute;
  inset: 0;
  translate: -120% 0;
  background: linear-gradient(100deg, transparent, oklch(1 0 0 / 0.28), transparent);
}

.download:hover {
  background: var(--brand-lift);
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px oklch(1 0 0 / 0.14) inset, 0 20px 52px -14px var(--glow);
}

.download:hover::after {
  animation: sheen 720ms ease;
}

.download:active {
  transform: translateY(0);
}

.download:focus-visible {
  outline: 2px solid var(--brand-lift);
  outline-offset: 4px;
}

/* Optically centred rather than metrically: the Apple mark has more mass below
   its midline, so it sits a hair high next to a cap-height label. */
.apple {
  width: 1.0625em;
  height: 1.0625em;
  margin-top: -0.125em;
  flex-shrink: 0;
}

@keyframes sheen {
  to { translate: 120% 0; }
}

.meta {
  margin: 1.125rem 0 0;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}

/* Pinned to the frame rather than trailing the content — it is a footnote about
   the download, not part of the pitch. */
.req {
  position: fixed;
  z-index: 3;
  left: 50%;
  translate: -50% 0;
  bottom: calc(var(--frame) + 1.5rem);
  margin: 0;
  width: min(34rem, 100% - 4rem);
  text-wrap: balance;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  text-align: center;
}

/* ── Entrance ────────────────────────────────────────────────────────────────
   One rise, staggered down the page. Runs once, backwards-filled so nothing is
   visible before its turn. */
.logo, h1, .tagline, .download, .meta, .req {
  animation: rise 900ms cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

.logo { animation-delay: 80ms; }
h1 { animation-delay: 180ms; }
.tagline { animation-delay: 300ms; }
.download { animation-delay: 420ms; }
.meta { animation-delay: 500ms; }
.req { animation-delay: 620ms; }

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
    filter: blur(6px);
  }
}

/* The download keeps its hover transition; everything ambient stops. A page
   that drifts and grains and sweeps is exactly the page someone with vestibular
   sensitivity asked not to be shown. */
@media (prefers-reduced-motion: reduce) {
  .aurora::before,
  .aurora::after,
  .logo, h1, .tagline, .download, .meta, .req {
    animation: none;
  }
  .download { transition: background 160ms ease; }
  .download:hover { transform: none; }
}

/* Short viewports: the fixed footnote would collide with the button, so it
   rejoins the flow and the page scrolls if it must. */
@media (max-height: 34rem) {
  body { overflow: auto; }
  main { padding: 5rem 0 3rem; }
  .req { position: static; translate: none; margin-top: 3rem; }
}