:root {
  --ink: #3d322b;
  --muted: #7e7066;
  --paper: #fffaf2;
  --cream: #f5eadb;
  --line: #eadccb;
  --accent: #a2442d;
  --accent-dark: #853421;
  --green: #326b56;
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(255, 255, 255, .85) 0 13%, transparent 14%),
    radial-gradient(circle at 94% 20%, rgba(226, 205, 178, .35) 0 16%, transparent 17%),
    linear-gradient(135deg, #fbf4e9 0%, #f3e7d8 55%, #efe1cf 100%);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .35;
  background-image: radial-gradient(rgba(117, 91, 68, .18) .6px, transparent .6px);
  background-size: 13px 13px;
}

main {
  position: relative;
  width: min(100% - 32px, 930px);
  margin: 0 auto;
  padding: 64px 0 30px;
}

.hero { text-align: center; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 13px 7px 8px;
  border: 1px solid rgba(162, 68, 45, .15);
  border-radius: 999px;
  background: rgba(255, 250, 242, .6);
  color: #6d5144;
  font-size: 14px;
  font-weight: 700;
}

.brand-mark {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff6eb;
  font-size: 13px;
  font-weight: 800;
}

.eyebrow {
  margin: 30px 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .24em;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.25;
  letter-spacing: -.03em;
}

.lead {
  max-width: 560px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 40px;
}

.card {
  display: flex;
  flex-direction: column;
  min-height: 270px;
  padding: 23px;
  border: 1px solid rgba(162, 68, 45, .12);
  border-radius: 24px;
  background: rgba(255, 250, 242, .86);
  box-shadow: 0 16px 45px rgba(104, 75, 48, .09);
  backdrop-filter: blur(12px);
}

.card-top {
  display: flex;
  align-items: center;
  gap: 13px;
}

.platform-icon {
  flex: none;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: #f4e3d4;
  color: var(--accent);
}

.platform-icon.android { background: #e5efe7; color: var(--green); }
.platform-icon svg { width: 26px; height: 26px; fill: currentColor; }

h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: -.01em;
}

.platform-note {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 23px 0;
  padding: 13px 0;
  border-block: 1px solid var(--line);
}

.meta div { display: flex; align-items: baseline; gap: 8px; }
.meta dt { color: var(--muted); font-size: 12px; }
.meta dd { margin: 0; font-size: 14px; font-weight: 700; }

.download {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 45px;
  margin-top: auto;
  border-radius: 13px;
  color: #fff8ef;
  background: var(--accent);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  transition: transform .15s ease, background .15s ease;
}

.download.secondary { background: var(--green); }
.download:hover { background: var(--accent-dark); transform: translateY(-1px); }
.download.secondary:hover { background: #245442; }

.checksum {
  margin-top: 12px;
  color: var(--muted);
  font-size: 11px;
}

.checksum summary { cursor: pointer; }
.checksum code {
  display: block;
  margin-top: 8px;
  padding: 8px;
  overflow-wrap: anywhere;
  border-radius: 8px;
  background: #f6eee3;
  color: #69594d;
  font-size: 10px;
  line-height: 1.5;
}

.notice {
  margin-top: 18px;
  padding: 18px 21px;
  border: 1px solid rgba(162, 68, 45, .12);
  border-radius: 18px;
  background: rgba(255, 250, 242, .55);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}

.notice strong { color: var(--ink); }
.notice p { margin: 4px 0 0; }

footer {
  display: flex;
  justify-content: center;
  gap: 9px;
  padding: 27px 0 7px;
  color: var(--muted);
  font-size: 12px;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 680px) {
  main { padding-top: 39px; }
  .cards { grid-template-columns: 1fr; gap: 13px; margin-top: 28px; }
  .card { min-height: 0; padding: 19px; border-radius: 20px; }
  .eyebrow { margin-top: 22px; }
  .lead { font-size: 14px; }
  .meta { margin: 18px 0; }
  .notice { font-size: 12px; }
}