:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #15213a;
  background: #f4f7fc;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 300px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(45, 105, 220, 0.13), transparent 30%),
    radial-gradient(circle at 90% 15%, rgba(255, 185, 35, 0.14), transparent 28%),
    linear-gradient(160deg, #f8faff 0%, #eef3fb 100%);
}

.page {
  display: grid;
  min-height: 100vh;
  padding: 28px 18px;
  place-content: center;
}

.download-card {
  width: min(100%, 540px);
  padding: 42px;
  border: 1px solid rgba(208, 219, 237, 0.9);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 24px 70px rgba(35, 62, 112, 0.12);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand img {
  border-radius: 18px;
  box-shadow: 0 9px 22px rgba(39, 92, 183, 0.18);
}

.eyebrow {
  margin: 0 0 5px;
  color: #3268c7;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.15em;
}

h1 {
  margin: 0;
  font-size: clamp(27px, 6vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.description {
  margin: 25px 0 8px;
  color: #65728a;
  font-size: 15px;
  line-height: 1.7;
}

.contact {
  margin: 0 0 25px;
  color: #1f3f7a;
  font-size: 14px;
  font-weight: 750;
  letter-spacing: 0.01em;
}

.version {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding: 13px 16px;
  border: 1px solid #e1e8f4;
  border-radius: 13px;
  background: #f8faff;
  color: #637087;
  font-size: 13px;
}

.version strong {
  color: #255bb9;
  font-size: 15px;
}

.download-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, #316ed8, #2456ae);
  box-shadow: 0 12px 25px rgba(37, 91, 185, 0.25);
  font-size: 16px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.download-button:hover {
  box-shadow: 0 15px 30px rgba(37, 91, 185, 0.32);
  transform: translateY(-2px);
}

.download-button:focus-visible {
  outline: 4px solid rgba(49, 110, 216, 0.22);
  outline-offset: 3px;
}

.hint {
  margin: 17px 4px 0;
  color: #69758b;
  font-size: 12px;
  line-height: 1.65;
  text-align: center;
}

.checksum {
  display: none;
  margin: 12px 0 0;
  overflow-wrap: anywhere;
  color: #9aa3b2;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 9px;
  line-height: 1.55;
  text-align: center;
}

footer {
  margin-top: 22px;
  color: #8b96a8;
  font-size: 11px;
  text-align: center;
}

@media (max-width: 520px) {
  .download-card {
    padding: 28px 22px;
    border-radius: 22px;
  }

  .brand {
    align-items: flex-start;
  }

  .brand img {
    width: 58px;
    height: 58px;
    border-radius: 14px;
  }
}