:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --link: #0066cc; --rule: #e5e5ea; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --fg: #f5f5f7; --muted: #a1a1a6; --link: #4da3ff; --rule: #38383a; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 64px; }
nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 20px; margin-bottom: 32px; font-size: 15px; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
.tagline { font-size: 22px; font-weight: 600; color: var(--muted); margin: 0 0 20px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
p, li { margin: 0 0 12px; }
.muted { color: var(--muted); }
a { color: var(--link); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); font-size: 14px; color: var(--muted); }
form { display: grid; gap: 14px; margin-top: 24px; }
/* The hidden attribute wins over display rules (a sent form hides itself). */
[hidden] { display: none !important; }
label { display: grid; gap: 6px; font-weight: 600; }
label.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
input, select, textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--rule); border-radius: 10px;
  background: var(--bg); color: var(--fg); width: 100%; }
label.check input { width: auto; margin-top: 5px; }
.paths { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 16px 0; }
.path { display: grid; gap: 4px; padding: 16px; border: 1px solid var(--rule); border-radius: 12px;
  color: var(--fg); text-decoration: none; }
.path strong { color: var(--link); font-size: 19px; }
.path span { color: var(--muted); font-size: 15px; }
.path:hover, .path:focus-visible { border-color: var(--link); }
.path-intro { font-weight: 600; }
#choose h2 { font-size: 21px; margin: 32px 0 0; }
textarea { min-height: 140px; resize: vertical; }
.optional { font-weight: 400; color: var(--muted); }
button { font: inherit; font-weight: 600; padding: 12px 20px; border: 0; border-radius: 12px;
  background: var(--link); color: #fff; cursor: pointer; justify-self: start; }
button:disabled { opacity: 0.5; }
.trap { position: absolute; left: -10000px; }
#status { margin-top: 16px; font-weight: 600; }

/* Home page */
body.home main { max-width: 1040px; }
.center { text-align: center; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; margin: 24px 0 0; }
.hero-text { text-align: center; }
.app-icon { border-radius: 25px; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15); margin-bottom: 16px; }
.hero h1 { font-size: 44px; }
.hero .tagline { font-size: 26px; }
.lead { font-size: 19px; }
.soon { display: inline-block; margin-top: 8px; padding: 6px 14px; border-radius: 999px;
  background: var(--rule); font-size: 15px; font-weight: 600; }
/* A screenshot in a dark iPad bezel. */
.ipad { margin: 0; padding: 2.2%; background: #1d1d1f; border-radius: 22px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.18), inset 0 0 0 1px #3a3a3c; }
.ipad img { display: block; width: 100%; height: auto; border-radius: 10px; }
.ipad.portrait { max-width: 420px; justify-self: center; width: 100%; padding: 3%; }
.caption { max-width: 640px; margin: 24px auto 0; color: var(--muted); }
section { margin-top: 80px; }
section h2 { font-size: 30px; margin: 0 0 12px; }
h3 { font-size: 19px; margin: 16px 0 6px; }
.tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 24px 0 28px; }
.tabs button { padding: 8px 16px; border-radius: 999px; background: var(--rule); color: var(--fg);
  font-size: 15px; justify-self: auto; }
.tabs button[aria-selected="true"] { background: var(--link); color: #fff; }
.player { display: grid; grid-template-columns: 1.6fr 1fr; gap: 40px; align-items: center; }
.stage { position: relative; aspect-ratio: 4 / 3; padding: 0; border: 14px solid #1d1d1f; }
.stage .layer { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  opacity: 0; transition: opacity 0.45s ease; border-radius: 10px; }
.stage .layer.shown { opacity: 1; }
.flow { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.flow li { position: relative; border-radius: 14px; overflow: hidden; }
.flow button { display: flex; gap: 12px; align-items: flex-start; width: 100%; text-align: left;
  padding: 10px 12px; background: none; color: var(--fg); font-weight: 400; border-radius: 14px; opacity: 0.55; }
.flow li.active button { opacity: 1; background: color-mix(in srgb, var(--rule) 55%, var(--bg)); }
.flow li.past button { opacity: 0.8; }
.flow .num { flex: none; margin: 0; }
.flow strong { display: block; font-size: 17px; }
.flow .text { display: none; color: var(--muted); font-size: 15px; line-height: 1.45; }
.flow li.active .text { display: block; margin-top: 2px; }
.flow .bar { position: absolute; left: 12px; right: 12px; bottom: 0; height: 3px; }
.flow .bar span { display: block; height: 100%; width: 0; background: var(--link); border-radius: 3px; }
.flow li.running .bar span { animation: fill var(--step-ms, 3s) linear forwards; }
@keyframes fill { to { width: 100%; } }
@media (prefers-reduced-motion: reduce) { .stage .layer { transition: none; } }
.num { display: inline-grid; place-items: center; width: 28px; height: 28px;
  border-radius: 50%; background: var(--link); color: #fff; font-size: 15px; font-weight: 600; }
.age-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.age-grid div { padding: 20px; border-radius: 18px; background: color-mix(in srgb, var(--rule) 45%, var(--bg)); }
.age-grid h3 { margin: 0 0 8px; color: var(--link); }
.age-grid p { margin: 0; color: var(--muted); font-size: 15px; }
@media (max-width: 960px) { .age-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .age-grid { grid-template-columns: 1fr; } }
.feature { display: grid; grid-template-columns: 1fr 1.3fr; gap: 48px; align-items: center; }
.feature p { font-size: 19px; color: var(--muted); }
.promises { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; text-align: center;
  padding: 32px 24px; border-radius: 22px; background: color-mix(in srgb, var(--rule) 45%, var(--bg)); }
.promises h3 { margin-top: 8px; }
.promises p { color: var(--muted); margin: 0; }
.emoji { font-size: 34px; }
@media (max-width: 760px) {
  .hero h1 { font-size: 36px; }
  section { margin-top: 56px; }
  .hero, .player, .promises, .feature { grid-template-columns: 1fr; }
  .hero { gap: 32px; }
  .ipad.portrait { max-width: 300px; }
  .stage { border-width: 8px; }
  .stage .layer { border-radius: 6px; }
  .feature { gap: 20px; }
  .ipad { border-radius: 14px; }
  .ipad img { border-radius: 6px; }
}
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.pair > div { padding: 24px; border-radius: 22px; background: color-mix(in srgb, var(--rule) 45%, var(--bg)); }
.pair h2 { font-size: 24px; margin: 8px 0; }
.pair p { color: var(--muted); margin: 0; }
.plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.plan-grid > div { padding: 24px; border-radius: 22px; border: 1px solid var(--rule); }
.plan-grid .plus { border: 2px solid var(--link); }
.plan-grid h3 { margin: 0 0 4px; color: var(--link); }
.plan-grid .price { font-size: 20px; font-weight: 700; margin: 0 0 4px; }
.plan-grid .trial { color: var(--muted); margin: 0; }
.plan-grid ul { margin: 16px 0 0; padding-left: 20px; }
.plan-grid li { margin-bottom: 8px; }
@media (max-width: 760px) { .pair, .plan-grid { grid-template-columns: 1fr; } }
.tm { font-size: 0.45em; vertical-align: super; font-weight: 600; margin-left: 2px; }
footer .legal { display: block; margin-top: 6px; }