:root {
  --brand: #1565c0;
  --bg: #ffffff;
  --fg: #1a1c1e;
  --muted: #5b6168;
  --border: #e2e5e9;
  --card-bg: #f5f7fa;
  --warn-bg: #fff4e5;
  --warn-fg: #7a4a00;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --fg: #e7eaed;
    --muted: #a2a9b0;
    --border: #2a2e33;
    --card-bg: #1a1e23;
    --warn-bg: #2e2410;
    --warn-fg: #f0b84c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

a {
  color: var(--brand);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 0;
}

.wordmark {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--fg);
  text-decoration: none;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px;
}

.hero {
  text-align: center;
  padding: 48px 0 32px;
}

.hero h1 {
  font-size: 2rem;
  margin: 0 0 12px;
}

.hero p {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 auto;
  max-width: 520px;
}

.version-tag[hidden] {
  display: none;
}

.version-tag {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 20px;
  border: 1px dashed var(--border);
  border-radius: 12px;
}

.platforms {
  display: grid;
  gap: 16px;
  margin: 24px 0 40px;
}

.platform-card {
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
}

.platform-card h3 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}

.platform-card .filename {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 12px;
  word-break: break-all;
}

.cta {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 999px;
}

.cta:hover {
  opacity: 0.9;
}

.checksum {
  margin: 14px 0 0;
}

.checksum .label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.checksum code {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.8rem;
  word-break: break-all;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
}

.warn {
  margin: 14px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--warn-bg);
  color: var(--warn-fg);
  font-size: 0.85rem;
}

footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

footer a {
  color: var(--muted);
}

footer .links {
  margin-bottom: 8px;
}

footer .links a {
  margin: 0 8px;
}