/* The app's colours and type, from src/styles/tokens.css, plus the launch
   video's grid. */
:root {
  --void: #0b0e14;
  --panel: #11151e;
  --line: #252c3d;
  --line2: #323a4e;
  --ink: #e6eaf2;
  --mute: #7b8598;
  --dim: #5a6377;
  --brand: #126bfc;
  --brand-lit: #2a7bff;
  --brand-text: #8fbaff;
  --on-brand: #ffffff;
  --glass: rgba(6, 9, 14, 0.72);
  --shadow: 0 0 0;
  --grid: rgba(143, 186, 255, 0.045);
  /* The lit top edge of a raised button, as light falls on it from above. */
  --highlight: rgba(255, 255, 255, 0.16);

  --ui: system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  --display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, Inter, Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --r: 7px;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);

  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  font: 400 16px/1.55 var(--ui);
  -webkit-font-smoothing: antialiased;
  /* The launch video's grid, faded out before the video so it never sits
     behind text the eye has to read. */
  background:
    linear-gradient(to bottom, transparent, var(--void) 560px),
    linear-gradient(var(--grid) 1px, transparent 1px) 50% 0 / 64px 64px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 50% 0 / 64px 64px,
    var(--void);
}

a { color: var(--ink); text-underline-offset: 3px; text-decoration-color: var(--line2); }
:focus-visible { outline: 2px solid var(--brand-lit); outline-offset: 3px; border-radius: var(--r); }

a, .download, .video-frame { -webkit-tap-highlight-color: transparent; }

.top {
  display: flex;
  justify-content: flex-end;
  padding: 18px 24px 0;
  padding-top: max(18px, env(safe-area-inset-top));
}

.top-link {
  font-size: 14px;
  color: var(--mute);
  text-decoration: none;
  padding: 8px 4px;
}

main {
  flex: 1;
  width: 100%;
  max-width: 912px;
  margin: 0 auto;
  padding: 0 16px;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 0 56px;
}

.app-icon {
  display: block;
  width: 88px;
  height: 88px;
  filter: drop-shadow(0 10px 24px rgb(var(--shadow) / 0.55));
}

h1 {
  margin: 20px 0 0;
  font: 700 44px/1.05 var(--display);
  letter-spacing: -0.025em;
}

.lede {
  max-width: 25em;
  margin: 14px 0 0;
  font-size: 20px;
  line-height: 1.45;
}
/* Lines break between the two sentences, never inside one, where there is room. */
.lede span { display: inline-block; text-wrap: balance; }

.download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
  height: 52px;
  padding: 0 28px;
  border-radius: var(--r);
  background: var(--brand);
  color: var(--on-brand);
  font: 600 16px/1 var(--ui);
  text-decoration: none;
  box-shadow: inset 0 1px 0 var(--highlight), 0 1px 2px rgb(var(--shadow) / 0.4);
  transition: background-color 120ms ease, transform 160ms var(--ease-out);
  user-select: none;
}
.download svg { width: 20px; height: 20px; }
.download:active { transform: scale(0.97); }

.meta {
  margin: 14px 0 0;
  min-height: 1.6em;
  font: 400 13px/1.6 var(--mono);
  color: var(--mute);
}

.note {
  max-width: 27em;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--dim);
  text-wrap: pretty;
}
.note[hidden] { display: none; }
.elsewhere { margin-top: 14px; color: var(--mute); }

.video { padding-bottom: 64px; }

.video-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  background: var(--panel);
  outline: 1px solid var(--line);
  outline-offset: -1px;
  transition: transform 160ms var(--ease-out);
}
a.video-frame:active { transform: scale(0.99); }
a.video-frame:focus-visible { outline: 2px solid var(--brand-lit); outline-offset: 3px; }
.video-frame img,
.video-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.play {
  position: absolute;
  left: 50%;
  top: 50%;
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  margin: -34px 0 0 -34px;
  border-radius: 50%;
  background: var(--glass);
  color: var(--on-brand);
  box-shadow: inset 0 0 0 1px var(--highlight);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background-color 150ms ease, transform 200ms var(--ease-out);
}
.play svg { width: 26px; height: 26px; margin-left: 3px; }

.duration {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 3px 7px;
  border-radius: 5px;
  background: var(--glass);
  font: 500 12px/1.4 var(--mono);
}

.meta a { color: var(--mute); }

.section { padding-bottom: 72px; }

h2 {
  margin: 0 0 24px;
  font: 650 26px/1.2 var(--display);
  letter-spacing: -0.015em;
}

h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
}

.section p {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--mute);
  text-wrap: pretty;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li { counter-increment: step; }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 10px;
  font: 500 13px/1 var(--mono);
  color: var(--brand-text);
}

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 32px;
}
.features > div {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.questions { border-top: 1px solid var(--line); }
.questions details { border-bottom: 1px solid var(--line); }
.questions summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}
.questions summary::-webkit-details-marker { display: none; }
/* A chevron drawn from two borders, turned to point down, then up when open. */
.questions summary::after {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  margin: -4px 4px 0 0;
  border-right: 1.5px solid var(--mute);
  border-bottom: 1.5px solid var(--mute);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease-out);
}
.questions details[open] summary::after { transform: translateY(4px) rotate(225deg); }
.questions details p { margin: 0; padding: 0 0 18px; max-width: 42em; }
.questions a { color: var(--ink); }

.caption {
  margin: 12px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--dim);
}
.caption a { color: var(--mute); }

.foot {
  border-top: 1px solid var(--line);
  padding: 28px 16px 36px;
  padding-bottom: max(36px, env(safe-area-inset-bottom));
  text-align: center;
  font-size: 14px;
  color: var(--mute);
}
.foot p { max-width: 40em; margin: 0 auto; text-wrap: pretty; }
.foot .small { margin-top: 8px; font-size: 13px; color: var(--dim); }

@media (hover: hover) and (pointer: fine) {
  a:hover { text-decoration-color: currentColor; }
  .top-link:hover { color: var(--ink); }
  .questions summary:hover { color: var(--brand-text); }
  .download:hover { background: var(--brand-lit); }
  .video-frame:hover .play { background: var(--brand); transform: scale(1.06); }
}

@media (prefers-reduced-motion: reduce) {
  .download, .video-frame, .play { transition: background-color 120ms ease; }
  .questions summary::after { transition: none; }
  .download:active, a.video-frame:active { transform: none; }
  .video-frame:hover .play { transform: none; }
}

@media (max-width: 560px) {
  .top { padding-right: 12px; }
  .hero { padding: 24px 0 40px; }
  .app-icon { width: 72px; height: 72px; }
  h1 { margin-top: 16px; font-size: 38px; }
  .lede { font-size: 18px; }
  .download { align-self: stretch; margin-top: 28px; }
  .video { padding-bottom: 44px; }
  .video-frame { border-radius: 10px; }
  .section { padding-bottom: 48px; }
  h2 { font-size: 23px; margin-bottom: 18px; }
  .steps, .features { grid-template-columns: 1fr; gap: 24px; }
  .play { width: 56px; height: 56px; margin: -28px 0 0 -28px; }
  .play svg { width: 22px; height: 22px; }
}