/* WordLern — one stylesheet for three pages. No build step, no framework.
   The palette is the app's: the icon's near-black field, its off-white, and the
   mastered green from BoxPalette (0.13, 0.45, 0.29). */

:root {
  --ink: #15181D;
  --paper: #F7F5F0;
  --muted: #9AA3AE;
  --line: #262B33;
  --surface: #1B1F26;
  --green: #21734A;
  --red: #D8232A;
  --gold: #F0C419;
  --slate: #3C434D;
  --measure: 34rem;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0 1.5rem;
  background: var(--ink);
  color: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

a {
  color: var(--paper);
  text-underline-offset: 3px;
  text-decoration-color: var(--muted);
}

a:hover {
  text-decoration-color: var(--paper);
}

/* Header ------------------------------------------------------------------ */

.masthead {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 4rem;
}

.masthead img {
  width: 36px;
  height: 36px;
  border-radius: 9px; /* the squircle iOS applies, approximated */
}

.masthead a {
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

/* Type -------------------------------------------------------------------- */

h1 {
  margin: 0 0 1rem;
  max-width: 18ch; /* two lines at the top of the page, at any width */
  font-size: clamp(2rem, 7vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  text-wrap: balance;
}

h2 {
  margin: 3rem 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1rem;
  max-width: var(--measure);
}

.lede {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.muted {
  color: var(--muted);
}

small,
.fine {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--muted);
}

/* The icon's three-segment rule, reused as the page's one piece of colour. */
.rule {
  display: flex;
  width: 120px;
  height: 5px;
  border-radius: 2.5px;
  overflow: hidden;
  margin: 2.5rem 0;
}

.rule span {
  flex: 1;
}

.rule span:nth-child(1) { background: var(--slate); }
.rule span:nth-child(2) { background: var(--red); }
.rule span:nth-child(3) { background: var(--gold); }

/* App Store badge --------------------------------------------------------- */

/* Apple's artwork, unmodified. Their guidelines ask for clear space of at
   least 10% of the badge's height on every side and a minimum height of
   40px on the web, which the margin and height below satisfy. */
.badge {
  display: inline-block;
  margin: 0.5rem 0 1rem;
  padding: 0.4rem;
}

.badge img {
  display: block;
  height: 48px;
  width: auto;
}

/* Gallery ------------------------------------------------------------------ */

.gallery {
  list-style: none;
  margin: 0 0 2.5rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.gallery img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
}

/* Features ---------------------------------------------------------------- */

.features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.features h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
}

.features p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* The claim that actually sells the app, so it gets its own surface. */
.promise {
  margin: 3.5rem 0 0;
  padding: 1.5rem;
  background: var(--surface);
  /* The mastered green, pulled most of the way back into the hairline — the
     app's one accent colour, used once. */
  border: 1px solid color-mix(in srgb, var(--green) 55%, var(--line));
  border-radius: 14px;
}

.promise p:last-child {
  margin: 0;
}

.promise strong {
  font-weight: 600;
}

/* Lists ------------------------------------------------------------------- */

.page ul:not(.features) {
  max-width: var(--measure);
  padding-left: 1.2rem;
}

.page ul:not(.features) li {
  margin-bottom: 0.5rem;
}

dl {
  max-width: var(--measure);
}

dt {
  font-weight: 600;
  margin-top: 1.5rem;
}

dd {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

/* Footer ------------------------------------------------------------------ */

footer {
  margin-top: 4.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

footer p {
  max-width: none;
}

/* The site is dark in both colour schemes on purpose: it is the app's own
   surface, and the icon is drawn for that background. */