:root {
  color-scheme: light;
  --ink: #142724;
  --muted: #60736f;
  --brand: #087f70;
  --brand-dark: #075e54;
  --soft: #e8f5f1;
  --line: #d8e5e1;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 4%, #d6f2ea 0, transparent 28rem),
    linear-gradient(160deg, #fbfdfc 0%, #f1f7f5 100%);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
.download-shell { width: min(1040px, calc(100% - 36px)); margin: 0 auto; padding: 26px 0 54px; }
nav { display: flex; justify-content: flex-end; }
nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
nav a:hover { color: var(--brand); }
.hero { max-width: 720px; margin: 8vh auto 58px; text-align: center; }
.product-mark {
  position: relative;
  display: grid;
  width: 72px;
  height: 72px;
  margin: 0 auto 22px;
  place-items: center;
  border-radius: 22px;
  background: var(--brand);
  box-shadow: 0 18px 42px rgba(8, 127, 112, .25);
}
.product-mark::before, .product-mark::after, .product-mark span {
  content: "";
  display: block;
  position: absolute;
  border-radius: 999px;
  background: white;
}
.product-mark::before { width: 36px; height: 7px; transform: translateY(-11px); }
.product-mark::after { width: 36px; height: 7px; transform: translateY(11px); }
.product-mark span { width: 24px; height: 7px; }
.eyebrow { margin: 0 0 10px; color: var(--brand); font-size: 12px; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 0; font-size: clamp(38px, 7vw, 64px); letter-spacing: -.055em; }
.lead { max-width: 620px; margin: 20px auto 28px; color: var(--muted); font-size: clamp(16px, 2.5vw, 19px); line-height: 1.75; }
.primary-download {
  display: inline-flex;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  padding: 0 28px;
  color: white;
  background: var(--brand);
  box-shadow: 0 12px 28px rgba(8, 127, 112, .22);
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  transition: transform .16s ease, background .16s ease;
}
.primary-download:hover { background: var(--brand-dark); transform: translateY(-2px); }
.primary-download:focus-visible { outline: 3px solid #7fd2c6; outline-offset: 4px; }
.version-info { margin-top: 12px; color: var(--muted); font-size: 13px; }
.primary-download[aria-disabled="true"] { pointer-events: none; opacity: .5; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps article, .trust-note, .companion-card {
  border: 1px solid rgba(20, 39, 36, .09);
  border-radius: 20px;
  padding: 24px;
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 15px 45px rgba(18, 58, 52, .06);
}
.steps span { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 10px; color: var(--brand); background: var(--soft); font-weight: 900; }
.steps h2, .trust-note h2 { margin: 18px 0 8px; font-size: 18px; }
.steps p, .trust-note p { margin: 0; color: var(--muted); line-height: 1.65; }
.companion-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 12px 24px; margin-top: 16px; }
.companion-card h2 { margin: 0 0 9px; font-size: 21px; }
.companion-card p { max-width: 670px; margin: 0; color: var(--muted); line-height: 1.65; }
.secondary-download { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; color: var(--brand-dark); background: white; font-weight: 800; text-decoration: none; }
.secondary-download:hover { border-color: #91c9bd; background: var(--soft); }
.companion-version { grid-column: 1 / -1; font-size: 12px !important; }
.trust-note { margin-top: 16px; }
.trust-note h2 { margin-top: 0; }
details { margin-top: 16px; }
summary { cursor: pointer; color: var(--brand); font-weight: 700; }
details small { display: block; margin-top: 12px; color: var(--muted); font-size: 12px; }
code { display: block; margin-top: 10px; overflow-wrap: anywhere; border-radius: 10px; padding: 12px; color: #dff5ef; background: #16322e; font-size: 12px; }
@media (max-width: 720px) {
  .hero { margin-top: 5vh; }
  .steps { grid-template-columns: 1fr; }
  .companion-card { grid-template-columns: 1fr; }
  .steps article { display: grid; grid-template-columns: 40px 1fr; column-gap: 10px; }
  .steps h2 { margin: 5px 0 6px; }
  .steps p { grid-column: 2; }
}