:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #121826;
  --muted: #5b6475;
  --line: #e2e6ee;
  --accent: #3b5bdb;
  --accent-text: #ffffff;
  --accent-soft: #e7ecfd;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131a;
    --surface: #171c25;
    --text: #e8ebf2;
    --muted: #9aa3b5;
    --line: #283041;
    --accent: #7c95ff;
    --accent-text: #0b1020;
    --accent-soft: #1d2640;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", "PingFang SC", "Microsoft YaHei", sans-serif;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 16px; }
.top { border-bottom: 1px solid var(--line); background: var(--surface); }
.brand { display: flex; align-items: center; gap: 10px; height: 60px; font-weight: 650; }
.brand img { border-radius: 8px; }
.hero { padding: 56px 16px 32px; }
.eyebrow { color: var(--accent); font-weight: 600; margin: 0 0 8px; }
h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.1; margin: 0 0 16px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 40px 0 12px; }
h3 { font-size: 17px; margin: 0 0 8px; }
.lede { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 28px; }
.download { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  font-weight: 600; text-decoration: none;
}
.btn:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: transparent; }
.btn.primary:hover { filter: brightness(1.06); }
.hint { margin: 0; color: var(--muted); }
.steps ol, .panel ol { padding-left: 22px; margin: 0; }
.steps li, .panel li { margin: 6px 0; }
.note { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; margin-top: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.card .os { font-weight: 650; }
.card .meta { color: var(--muted); font-size: 14px; }
.card .sha { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 11px; color: var(--muted); word-break: break-all; }
.card.recommended { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.badge { align-self: flex-start; font-size: 12px; font-weight: 600; color: var(--accent); background: var(--accent-soft); border-radius: 999px; padding: 2px 10px; }
.two { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 12px; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.foot { padding: 32px 16px 48px; border-top: 1px solid var(--line); margin-top: 48px; }