:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --blue: #245ee8;
  --ink: #13213a;
  --muted: #64758f;
  --line: #dfe8f5;
}

* { box-sizing: border-box; }

body {
  align-items: center;
  background:
    radial-gradient(circle at 18% 12%, rgba(35, 182, 201, 0.16), transparent 30%),
    linear-gradient(145deg, #f8fcff, #edf5ff 58%, #eefbf7);
  color: var(--ink);
  display: flex;
  justify-content: center;
  margin: 0;
  min-height: 100svh;
  padding: 28px 18px;
}

.download-shell {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 24px 70px rgba(27, 72, 145, 0.14);
  max-width: 520px;
  padding: clamp(28px, 7vw, 48px);
  text-align: center;
  width: 100%;
}

.brand-icon {
  border-radius: 22px;
  height: 88px;
  margin: 0 auto 22px;
  width: 88px;
}

.platform-label {
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(28px, 8vw, 40px);
  margin: 0 0 12px;
}

.lead {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  margin: 0 auto 26px;
}

.primary-button {
  align-items: center;
  background: var(--blue);
  border-radius: 12px;
  color: white;
  display: flex;
  font-size: 16px;
  font-weight: 800;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  text-decoration: none;
}

.primary-button:hover,
.primary-button:focus-visible { background: #174bc9; }

.release-meta {
  background: #f4f8fe;
  border: 1px solid #e3ebf7;
  border-radius: 12px;
  color: #52637c;
  display: grid;
  font-size: 13px;
  gap: 7px;
  margin-top: 18px;
  padding: 15px;
}

.release-meta strong { color: #253750; }

.notice {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
  margin: 22px 0 0;
}

.back-link {
  color: var(--blue);
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  margin-top: 24px;
  text-decoration: none;
}