:root {
  --ink: #1f2933;
  --muted: #61717d;
  --line: #dce4e7;
  --paper: #f7faf8;
  --white: #ffffff;
  --teal: #087f78;
  --teal-soft: #dff4ee;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

a { color: inherit; }

.topbar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100% - 1120px) / 2));
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 2px solid var(--teal);
  color: var(--teal);
  background: var(--teal-soft);
  font-family: Georgia, serif;
}

.topbar-note { color: var(--muted); font-size: 14px; }

main { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 48px 0 72px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
  gap: 36px;
  align-items: center;
  padding: 28px 0 48px;
}

.eyebrow { margin: 0 0 8px; color: var(--teal); font-size: 13px; font-weight: 700; letter-spacing: 0.08em; }
h1 { margin: 0; font-size: 42px; line-height: 1.2; }
.lead { max-width: 520px; margin: 16px 0 28px; color: #385851; font-size: 18px; line-height: 1.7; }

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }

.download-btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  color: var(--white);
  background: var(--teal);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

.download-btn[aria-disabled="true"] { opacity: 0.55; pointer-events: none; }
.download-btn:hover { filter: brightness(1.05); }

.version-meta { margin: 0; color: var(--muted); font-size: 14px; }

.hero-card { display: grid; place-items: center; }

.phone-frame {
  width: min(100%, 280px);
  padding: 22px 18px;
  background: var(--white);
  border: 1px solid #c6e4dc;
  border-radius: 24px;
  box-shadow: 0 18px 40px rgba(14, 30, 29, 0.08);
}

.phone-brand { margin: 0; color: var(--teal); font-weight: 800; }
.phone-title { margin: 8px 0 16px; font-size: 22px; font-weight: 800; }
.phone-list { display: grid; gap: 8px; }
.phone-list span {
  display: block;
  padding: 12px 14px;
  background: #e8f4ee;
  border-radius: 8px;
  font-weight: 700;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.features article {
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.features h2 { margin: 0 0 10px; font-size: 18px; }
.features p { margin: 0; color: var(--muted); line-height: 1.7; }

footer {
  padding: 24px 16px 36px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

footer a { color: inherit; text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 800px) {
  h1 { font-size: 32px; }
  .hero, .features { grid-template-columns: 1fr; }
  .hero-card { order: -1; }
}