:root {
  color-scheme: light dark;
  --bg: #fff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.12);
  --accent: #0066cc;
  --button: #0071e3;
  --button-hover: #0062c4;
  --card: #f5f5f7;
  --header-bg: rgba(255, 255, 255, 0.72);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.18), 0 2px 8px rgba(0, 0, 0, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro", system-ui, "Helvetica Neue", sans-serif;
  --display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro", system-ui, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000;
    --bg-alt: #111113;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: rgba(255, 255, 255, 0.16);
    --accent: #2997ff;
    --card: #1c1c1e;
    --header-bg: rgba(0, 0, 0, 0.72);
    --shadow: 0 30px 80px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.08);
  }
}

* { box-sizing: border-box; }
html { scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

img, picture { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); }
h1, h2, h3 { font-family: var(--display); margin: 0; }
p { margin: 0; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
}
.skip-link:focus { top: 12px; }

.shell { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}
.site-header .shell { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 16px; min-height: 52px; }
.wordmark { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 600; text-decoration: none; }
.wordmark img { border-radius: 7px; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 2px 18px; }
.site-header nav a { padding: 8px 0; color: var(--muted); font-size: 14px; text-decoration: none; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--text); }

/* Hero */
.hero { padding: 72px 0 0; text-align: center; overflow: hidden; }
.eyebrow { margin-bottom: 12px; color: var(--muted); font-size: 15px; font-weight: 600; letter-spacing: 0.01em; }
h1 { font-size: clamp(40px, 8vw, 80px); line-height: 1.04; letter-spacing: -0.03em; font-weight: 700; text-wrap: balance; }
.lead { max-width: 40ch; margin: 20px auto 0; color: var(--muted); font-size: clamp(19px, 2.6vw, 24px); line-height: 1.35; text-wrap: balance; }
.actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 12px 24px; margin-top: 32px; }
.button {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  min-height: 48px;
  padding: 10px 28px;
  border-radius: 999px;
  background: var(--button);
  color: #fff;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
}
.button:hover { background: var(--button-hover); }
.button small { font-size: 12px; font-weight: 400; opacity: 0.9; }
.text-link { text-decoration: none; font-weight: 500; }
.text-link:hover { text-decoration: underline; }
.note { margin-top: 16px; color: var(--muted); font-size: 14px; }

.hero-shot { margin: 56px auto 0; width: min(900px, calc(100% - 24px)); }
.hero-shot img { width: 100%; border-radius: 12px; box-shadow: var(--shadow); }

/* Sections */
section { padding: 96px 0; }
.alt { background: var(--bg-alt); }
.heading { max-width: 22ch; margin-bottom: 48px; }
.heading.center { margin-inline: auto; text-align: center; }
h2 { font-size: clamp(30px, 5vw, 48px); line-height: 1.08; letter-spacing: -0.025em; font-weight: 700; text-wrap: balance; }
h3 { font-size: 21px; line-height: 1.2; letter-spacing: -0.01em; font-weight: 600; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; }
.feature { padding: 28px; border-radius: 20px; background: var(--card); }
.feature p { margin-top: 10px; color: var(--muted); font-size: 16px; }
kbd { padding: 1px 6px; border: 1px solid var(--line); border-radius: 6px; font: 0.85em var(--mono); white-space: nowrap; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; counter-reset: step; }
.step { position: relative; padding: 28px; border-radius: 20px; background: var(--bg); box-shadow: inset 0 0 0 1px var(--line); counter-increment: step; }
.step::before { content: counter(step); display: grid; place-items: center; width: 36px; height: 36px; margin-bottom: 16px; border-radius: 50%; background: var(--button); color: #fff; font-weight: 700; }
.step p { margin-top: 8px; color: var(--muted); font-size: 16px; }
.step strong { color: var(--text); font-weight: 600; }
.steps-note { margin-top: 32px; color: var(--muted); font-size: 15px; text-align: center; }

/* Games */
.games { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
.game { display: flex; align-items: center; gap: 16px; padding: 16px 20px; border-radius: 16px; background: var(--card); }
.game img { flex: none; width: 48px; height: 48px; border-radius: 11px; }
.game div { flex: 1; min-width: 0; }
.game h3 { font-size: 18px; }
.game p { margin-top: 2px; color: var(--muted); font-size: 15px; }
.pill { flex: none; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 600; }
.pill.ok { background: rgba(52, 199, 89, 0.16); color: #1a7f37; }
.pill.wip { background: rgba(255, 149, 0, 0.16); color: #a35200; }
@media (prefers-color-scheme: dark) { .pill.ok { color: #30d158; } .pill.wip { color: #ff9f0a; } }
.games-note { margin-top: 24px; color: var(--muted); font-size: 15px; }

/* FAQ */
.faq { max-width: 760px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding: 20px 32px 20px 0; position: relative; font-size: 19px; font-weight: 600; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; color: var(--muted); font-size: 26px; font-weight: 300; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { padding: 0 0 20px; color: var(--muted); }
.faq details p + p { margin-top: -8px; }
code { padding: 1px 5px; border-radius: 5px; background: var(--card); font: 0.88em var(--mono); }

/* Gallery */
.gallery { display: grid; gap: 56px 24px; padding: 0; margin: 0; list-style: none; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); }
.gallery li { margin: 0; }
.gallery .wide { grid-column: 1 / -1; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; border-radius: 10px; box-shadow: var(--shadow); background: var(--card); }
.gallery figcaption { margin-top: 16px; color: var(--muted); font-size: 15px; }
.gallery figcaption strong { display: block; color: var(--text); font-size: 17px; font-weight: 600; }
.demo-note { margin-top: 48px; color: var(--muted); font-size: 14px; text-align: center; }

/* Download */
.download { text-align: center; }
.download img { margin: 0 auto 24px; border-radius: 24px; }
.download p { margin-top: 12px; color: var(--muted); }
.download .button { margin-top: 28px; }

/* Footer */
.site-footer { padding: 32px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.site-footer .shell { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px 20px; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

/* Entrance motion */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .feature, .step, .gallery li {
      animation: rise linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 40%;
    }
  }
  @keyframes rise { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }
  .button { transition: background-color 0.2s; }
}

@media (max-width: 480px) {
  section { padding: 64px 0; }
  .hero { padding-top: 48px; }
  .feature, .step { padding: 22px; }
  .game { padding: 14px 16px; gap: 12px; }
}