:root {
  color-scheme: light;
  --bg: #f7f8f5;
  --surface: #ffffff;
  --ink: #172017;
  --muted: #5f695f;
  --line: #dfe5dc;
  --accent: #4f6f1f;
  --notice: #edf4df;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10;
  padding: 8px 12px;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.legacy-shell {
  width: min(100% - 40px, 780px);
  margin: 0 auto;
  padding: 44px 0 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand img { width: 48px; height: 48px; border-radius: 12px; }
.brand strong { display: block; font-size: 18px; }
.brand small { display: block; color: var(--muted); font-size: 12px; }

.version-notice {
  margin: 30px 0 38px;
  padding: 18px 20px;
  border: 1px solid #cddbad;
  border-radius: 14px;
  background: var(--notice);
}

.version-notice strong { display: block; margin-bottom: 4px; }
.version-notice p { margin: 0; font-size: 14px; }

h1, h2 { line-height: 1.25; letter-spacing: -.025em; }
h1 { margin: 0 0 8px; font-size: clamp(32px, 7vw, 48px); }
h2 { margin: 38px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); font-size: 22px; }
p, li { font-size: 16px; }
.meta { margin: 0 0 30px; color: var(--muted); font-size: 14px; }

.support-card {
  margin: 24px 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.support-card p { margin-bottom: 0; }

.page-footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.page-footer nav { display: flex; flex-wrap: wrap; gap: 12px 20px; }
.page-footer p { font-size: 14px; }

@media (max-width: 560px) {
  .legacy-shell { width: min(100% - 28px, 780px); padding-top: 28px; }
  .version-notice { margin-top: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}