:root {
  color-scheme: dark;
  --background: #0d1219;
  --panel: #171f2a;
  --panel-soft: #111923;
  --line: #2d3a49;
  --text: #f2f6fb;
  --muted: #a9b5c3;
  --accent: #43d9c2;
  --accent-deep: #3877d6;
  --warning: #f0c66a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 12%, rgba(41, 128, 185, .18), transparent 38%),
    radial-gradient(circle at 82% 86%, rgba(67, 217, 194, .12), transparent 34%),
    var(--background);
  color: var(--text);
  font: 16px/1.55 "Segoe UI", Arial, sans-serif;
}

main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 36px 18px;
}

.download-card {
  width: min(680px, 100%);
  padding: clamp(28px, 6vw, 54px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(23, 31, 42, .96);
  box-shadow: 0 24px 70px rgba(0, 0, 0, .34);
  text-align: center;
}

.logo {
  width: 92px;
  height: 92px;
  object-fit: contain;
  margin-bottom: 8px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .18em;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1.12;
}

.intro {
  margin: 14px 0 22px;
  color: var(--muted);
  font-size: 18px;
}

.release-meta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.release-meta span {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 13px;
}

.download-button {
  display: block;
  width: 100%;
  padding: 15px 20px;
  border-radius: 11px;
  background: linear-gradient(115deg, var(--accent), var(--accent-deep));
  color: #07131c;
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  transition: filter .15s ease, transform .15s ease;
}

.download-button:hover { filter: brightness(1.08); transform: translateY(-1px); }
.download-button:focus-visible { outline: 3px solid white; outline-offset: 3px; }

.notice {
  margin: 24px 0 18px;
  padding: 15px 17px;
  border: 1px solid rgba(240, 198, 106, .4);
  border-radius: 11px;
  background: rgba(240, 198, 106, .08);
  text-align: left;
}

.notice strong { color: var(--warning); }
.notice p { margin: 5px 0 0; color: var(--muted); font-size: 14px; }

.checksum {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.checksum > div { min-width: 0; }
.label { display: block; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; }
code { display: block; margin-top: 4px; overflow-wrap: anywhere; color: var(--text); font: 12px/1.45 Consolas, monospace; user-select: all; }
.checksum a { flex: 0 0 auto; color: #80c8ff; font-size: 13px; }
.updated { margin: 18px 0 0; color: var(--muted); font-size: 13px; }

@media (max-width: 560px) {
  .download-card { padding: 28px 20px; border-radius: 16px; }
  .checksum { align-items: flex-start; flex-direction: column; }
}

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