:root {
  color-scheme: dark;
  --ink: #f4f7fb;
  --muted: #aab8ca;
  --bg: #07111f;
  --panel: #0d1c2f;
  --line: #243751;
  --cyan: #59e6d0;
  --yellow: #ffd166;
  --focus: #ffffff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.65;
}

a { color: var(--cyan); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-180%);
  padding: .7rem 1rem;
  background: var(--ink);
  color: var(--bg);
  font-weight: 800;
}
.skip-link:focus { transform: translateY(0); }

.hero {
  min-height: 760px;
  padding: 0 clamp(1.25rem, 6vw, 6rem);
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 35%, rgba(89, 230, 208, .14), transparent 24rem),
    linear-gradient(135deg, #07111f 0%, #0b1d31 100%);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 850;
  letter-spacing: -.02em;
}

.brand-mark, .platform-icon {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--cyan);
  font-weight: 900;
}

.source-link { font-weight: 700; }

.hero main {
  max-width: 1200px;
  min-height: 650px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: center;
}

.hero-copy { max-width: 780px; }

.eyebrow {
  margin: 0 0 .9rem;
  color: var(--cyan);
  font-size: .78rem;
  font-weight: 850;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, h3 { margin-top: 0; line-height: 1.08; letter-spacing: -.04em; }
h1 { max-width: 13ch; margin-bottom: 1.5rem; font-size: clamp(3.1rem, 8vw, 6.8rem); }
h2 { margin-bottom: .8rem; font-size: clamp(2rem, 5vw, 3.6rem); }
h3 { margin-bottom: 1rem; font-size: 2rem; }

.lede { max-width: 62ch; margin-bottom: 2rem; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.35rem); }

.primary-action, .download-button {
  display: inline-flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
  min-height: 3.25rem;
  padding: .75rem 1.1rem;
  border: 2px solid var(--cyan);
  background: var(--cyan);
  color: #04120f;
  text-decoration: none;
  font-weight: 900;
}
.primary-action:hover, .download-button:hover { background: transparent; color: var(--cyan); }

.signal {
  height: 330px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(.4rem, 1vw, .8rem);
}
.signal span {
  width: clamp(.55rem, 1.2vw, 1rem);
  height: var(--height, 30%);
  background: linear-gradient(var(--yellow), var(--cyan));
  border-radius: 999px;
  box-shadow: 0 0 2rem rgba(89, 230, 208, .22);
}
.signal span:nth-child(2), .signal span:nth-child(8) { --height: 48%; }
.signal span:nth-child(3), .signal span:nth-child(7) { --height: 72%; }
.signal span:nth-child(4), .signal span:nth-child(6) { --height: 92%; }
.signal span:nth-child(5) { --height: 58%; }

.downloads, .steps, .notice, footer {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: clamp(1.25rem, 6vw, 3rem);
  padding-right: clamp(1.25rem, 6vw, 3rem);
}
.downloads { padding-top: 7rem; padding-bottom: 7rem; }
.section-heading { max-width: 680px; margin-bottom: 2.5rem; }
.section-heading > p:last-child { color: var(--muted); }

.download-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.4rem; }
.download-card {
  min-height: 560px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line);
  background: var(--panel);
}
.android-card { border-top: 5px solid var(--cyan); }
.windows-card { border-top: 5px solid var(--yellow); }
.windows-card .platform-icon { color: var(--yellow); }
.platform { margin: 0 0 .3rem; color: var(--muted); font-weight: 750; }
.download-card p { color: var(--muted); }
.facts { margin: 0 0 1rem; padding-left: 1.25rem; color: var(--ink); }
.download-button { width: 100%; margin-top: auto; }
.card-note { margin: 0; font-size: .86rem; }

.steps { padding-top: 6rem; padding-bottom: 6rem; border-top: 1px solid var(--line); }
.steps ol { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; gap: .5rem; }
.steps li > span { color: var(--cyan); font-weight: 900; }
.steps strong { font-size: 1.35rem; }
.steps p { margin: 0; color: var(--muted); }

.notice {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  gap: 3rem;
  margin-bottom: 6rem;
  padding-top: 3rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--yellow);
  border-bottom: 1px solid var(--yellow);
}
.notice p:last-child { margin: 0; color: var(--muted); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

@media (max-width: 760px) {
  .hero { min-height: auto; }
  .hero main { min-height: auto; grid-template-columns: 1fr; padding: 6rem 0 4rem; }
  .signal { height: 180px; }
  .download-grid, .steps ol, .notice { grid-template-columns: 1fr; }
  .download-card { min-height: 0; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}