@font-face {
  font-family: "Silkscreen";
  src: url("fonts/Silkscreen-Regular.ttf") format("truetype");
  font-display: swap;
}
:root {
  --ink: #191c20;
  --panel: #24272d;
  --paper: #f8f7ed;
  --muted: #a4a9a8;
  --coral: #e47158;
  --green: #a3ed6f;
  --cyan: #67d9f0;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 13px; image-rendering: pixelated; }
header a { color: inherit; text-decoration: none; }
.brand { font-family: "Silkscreen", monospace; font-size: 26px; letter-spacing: 1px; }
h1, h2 { font-family: "Silkscreen", monospace; font-weight: 400; line-height: 1.25; }
h1 { font-size: 30px; margin: 0 0 6px; }
h2 { font-size: 20px; margin: 34px 0 8px; color: var(--cyan); }
p, li { color: var(--paper); }
.meta { color: var(--muted); margin-top: 0; }
a { color: var(--cyan); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.panel { background: var(--panel); border-radius: 12px; padding: 16px 18px; margin: 18px 0; }
.panel ol { margin: 0; padding-left: 22px; }
.button {
  display: inline-block; background: var(--green); color: var(--ink);
  font-family: "Silkscreen", monospace; font-size: 18px; padding: 12px 18px;
  border-radius: 10px; text-decoration: none; margin: 8px 8px 0 0;
}
.button.quiet { background: var(--panel); color: var(--paper); }
footer { margin-top: 48px; color: var(--muted); font-size: 15px; }
footer a { color: var(--muted); margin-right: 16px; }
code { font-family: ui-monospace, Menlo, monospace; font-size: 15px; }

/* Landing pages (home and challenge): the game's own look. */
:root {
  --silver: #c9d2da;
  --gold: #f4c542;
  --ace: #8fe3ff;
  --perfect: #ff7bd5;
  --green-edge: #4ecd39;
  --key: #343a42;
  --bezel: #0d0f12;
}
.landing {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(248, 247, 237, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(248, 247, 237, .035) 1px, transparent 1px);
  background-size: 16px 16px;
  overflow-x: hidden;
}
.landing h1, .pixel { font-family: "Silkscreen", monospace; font-weight: 400; }
.hero {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  gap: 0; max-width: 560px; margin: 0 auto; padding: 40px 16px 32px;
}
.hero-icon {
  width: 96px; height: 96px; border-radius: 22px;
  box-shadow: 0 0 0 3px var(--key), 0 6px 0 3px var(--bezel);
}
.hero h1 { font-size: 34px; line-height: 1.15; margin: 22px 0 10px; letter-spacing: 1px; }
.hero h1 a { color: inherit; text-decoration: none; }
.hero-line { font-size: 18px; line-height: 1.5; margin: 0 0 26px; max-width: 26em; }
.play {
  display: block; width: 100%; max-width: 360px; margin: 0 auto;
  padding: 18px 16px 22px; border-radius: 12px; text-align: center;
  background: var(--green); color: var(--ink); text-decoration: none;
  font-family: "Silkscreen", monospace; font-size: 22px; line-height: 1.2;
  box-shadow: inset 0 -6px 0 var(--green-edge), 0 0 0 3px var(--bezel), 0 6px 0 3px var(--bezel);
}
.play:hover { background: #b6f48a; }
.play:active { transform: translateY(4px); box-shadow: inset 0 -2px 0 var(--green-edge), 0 0 0 3px var(--bezel), 0 2px 0 3px var(--bezel); }
.play:focus-visible { outline: 3px solid var(--paper); outline-offset: 6px; }

/* Screenshots in phone frames; only this strip scrolls sideways. */
.strip {
  display: flex; gap: 16px; list-style: none; margin: 0 auto; padding: 8px 16px 20px;
  width: max-content; max-width: 100%;
  overflow-x: auto; overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory; scroll-padding: 0 16px;
  -webkit-overflow-scrolling: touch;
}
.strip li { margin: 0; flex: 0 0 auto; scroll-snap-align: center; }
.phone {
  width: min(64vw, 232px); padding: 10px; border-radius: 30px;
  background: var(--bezel); box-shadow: 0 0 0 3px var(--key), 0 8px 0 3px #08090b;
}
.phone img { display: block; width: 100%; height: auto; aspect-ratio: 1 / 2; border-radius: 20px; }
.pair { display: flex; justify-content: center; gap: 14px; list-style: none; padding: 0; margin: 40px 0 0; }
.pair .phone { width: min(42vw, 220px); padding: 7px; border-radius: 22px; }
.pair .phone img { border-radius: 15px; }

.wrap { max-width: 560px; margin: 0 auto; padding: 24px 16px 56px; }
.features { list-style: none; padding: 0; margin: 8px 0 40px; }
.features li {
  display: flex; gap: 14px; align-items: baseline; margin: 0 0 18px;
  font-family: "Silkscreen", monospace; font-size: 18px; line-height: 1.45;
}
.features li::before {
  content: ""; flex: 0 0 14px; height: 14px; transform: translateY(1px);
  background: var(--mark); box-shadow: 0 0 0 2px var(--bezel), 3px 3px 0 2px var(--bezel);
}
.mark-gold { --mark: var(--gold); }
.mark-ace { --mark: var(--ace); }
.mark-perfect { --mark: var(--perfect); }
.silver { color: var(--silver); }
.gold { color: var(--gold); }
.ace { color: var(--ace); }
.perfect { color: var(--perfect); }
.ladder { display: flex; gap: 3px; height: 10px; margin: 0 0 32px; }
.ladder span { flex: 1; background: var(--silver); }
.ladder span:nth-child(2) { background: var(--gold); }
.ladder span:nth-child(3) { background: var(--ace); }
.ladder span:nth-child(4) { background: var(--perfect); }
.banner { display: block; width: 100%; height: auto; border-radius: 14px; margin: 0 0 40px; box-shadow: 0 0 0 3px var(--key); }
.landing footer { text-align: center; }
.landing footer a { margin: 0 10px; }

/* Challenge page */
.brandbar { justify-content: center; margin: 0; padding: 24px 16px 0; }
.brandbar img { width: 40px; height: 40px; border-radius: 9px; }
.brandbar .brand { font-size: 20px; }
.challenge.hero { padding-top: 28px; }
.challenge h1 { font-size: 32px; margin-top: 0; }
.steps { list-style: none; counter-reset: step; padding: 0; margin: 36px auto 0; width: 100%; max-width: 360px; text-align: left; }
.steps li { counter-increment: step; display: flex; gap: 12px; align-items: center; margin: 0 0 10px; font-size: 17px; }
.steps li::before {
  content: counter(step); flex: 0 0 30px; height: 30px; border-radius: 6px;
  display: grid; place-items: center; background: var(--key); color: var(--green);
  font-family: "Silkscreen", monospace; font-size: 16px;
}

@media (min-width: 720px) {
  .hero { padding-top: 64px; }
  .hero-icon { width: 120px; height: 120px; border-radius: 27px; }
  .hero h1 { font-size: 46px; }
  .hero-line { font-size: 20px; }
  .strip { gap: 24px; padding-bottom: 28px; }
  .phone { width: 220px; }
  .challenge h1 { font-size: 40px; }
}
@media (prefers-reduced-motion: reduce) {
  .play:active { transform: none; }
}