:root {
  color: #111111;
  background: #f5f5f7;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: #f5f5f7; }

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 50% 32%, rgba(25, 164, 71, 0.08), transparent 28rem),
    #f5f5f7;
}

a { color: inherit; }

.shell {
  width: min(100% - 40px, 920px);
  min-height: 100vh;
  margin: 0 auto;
  padding: max(20px, env(safe-area-inset-top)) 0 max(32px, env(safe-area-inset-bottom));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
}

.brand {
  font-size: 1.35rem;
  font-weight: 750;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.brand span { color: #19a447; }

.topbar p {
  margin: 0;
  color: #6e6e73;
  font-size: 0.875rem;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(60px, 11vh, 112px) 20px 52px;
  text-align: center;
}

.product-mark {
  display: grid;
  width: 76px;
  height: 76px;
  margin-bottom: 28px;
  place-items: center;
  border: 1px solid rgba(60, 60, 67, 0.12);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.09), inset 0 1px rgba(255, 255, 255, 0.9);
}

.product-mark svg { width: 42px; fill: #19a447; }
.product-mark .mark-check { fill: none; stroke: #fff; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }

.eyebrow {
  margin: 0 0 10px;
  color: #19a447;
  font-size: 0.95rem;
  font-weight: 650;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 7vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.intro {
  margin: 18px 0 34px;
  color: #6e6e73;
  font-size: 1.0625rem;
  line-height: 1.5;
}

.download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: min(100%, 390px);
  min-height: 58px;
  padding: 14px 24px;
  border-radius: 18px;
  background: #111111;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.18);
  color: #ffffff;
  font-size: 1.0625rem;
  font-weight: 650;
  text-decoration: none;
  transition: transform 160ms ease, opacity 160ms ease;
  -webkit-tap-highlight-color: transparent;
}

.download svg { width: 23px; margin-right: 10px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.8; }
.download:hover { opacity: 0.9; }
.download:active { transform: scale(0.97); }
.download:focus-visible { outline: 3px solid rgba(25, 164, 71, 0.45); outline-offset: 4px; }

.requirement {
  margin: 16px 0 0;
  color: #6e6e73;
  font-size: 0.875rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
  border: 0.7px solid rgba(60, 60, 67, 0.12);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 14px 42px rgba(0, 0, 0, 0.07), inset 0 1px rgba(255, 255, 255, 0.85);
}

.features article {
  position: relative;
  padding: 26px 18px;
  text-align: center;
}

.features article + article::before {
  position: absolute;
  top: 22px;
  bottom: 22px;
  left: 0;
  width: 1px;
  background: rgba(60, 60, 67, 0.12);
  content: "";
}

.features span {
  display: grid;
  width: 34px;
  height: 34px;
  margin: 0 auto 12px;
  place-items: center;
  border-radius: 50%;
  background: rgba(25, 164, 71, 0.1);
  color: #19a447;
  font-size: 0.875rem;
  font-weight: 700;
}

.features h2 { margin: 0; font-size: 1rem; font-weight: 650; }
.features p { margin: 6px 0 0; color: #6e6e73; font-size: 0.875rem; }

@media (max-width: 560px) {
  .shell { width: min(100% - 32px, 920px); }
  .hero { padding: 58px 0 42px; }
  .topbar p { font-size: 0.8125rem; }
  .features article { padding: 22px 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .download { transition: none; }
}