:root {
  color-scheme: light dark;
  --page: #f4f6f8;
  --paper: rgba(255, 255, 255, 0.86);
  --ink: #182538;
  --muted: #5d6a7a;
  --line: rgba(24, 37, 56, 0.12);
  --link: #315f9c;
  --shadow: 0 18px 48px rgba(31, 45, 66, 0.09);
}

* { box-sizing: border-box; }
html { background: var(--page); scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 0%, rgba(122, 162, 211, 0.16), transparent 36rem),
    var(--page);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

::selection { color: #fff; background: #315f9c; }
a { color: var(--link); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid rgba(49, 95, 156, 0.38); outline-offset: 3px; border-radius: 3px; }

.site-header,
footer {
  width: min(100% - 40px, 780px);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header { min-height: 80px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 650; letter-spacing: 0.03em; }
.brand i { width: 1px; height: 18px; background: var(--line); }
.support-link { color: var(--muted); font-size: 0.9rem; }

main {
  width: min(100% - 32px, 780px);
  margin: 20px auto 72px;
  padding: clamp(28px, 6vw, 68px);
  background: var(--paper);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

h1, h2, h3 { line-height: 1.24; letter-spacing: -0.025em; text-wrap: balance; }
h1 { margin: 0 0 32px; font-size: clamp(2rem, 5vw, 3rem); }
h2 { margin: 48px 0 14px; font-size: 1.42rem; }
h3 { margin: 30px 0 10px; font-size: 1.1rem; }
p, ul, ol, table { margin-block: 0 18px; }
li + li { margin-top: 7px; }
strong { font-weight: 680; }
hr { border: 0; height: 1px; background: var(--line); margin: 44px 0; }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: start; vertical-align: top; }
th { color: var(--muted); font-weight: 650; }

footer { min-height: 76px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }

@media (max-width: 620px) {
  .site-header { min-height: 68px; }
  main { width: min(100% - 20px, 780px); margin-top: 8px; padding: 28px 22px 38px; }
  table { display: block; overflow-x: auto; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0d1826;
    --paper: rgba(20, 33, 50, 0.9);
    --ink: #eef4fb;
    --muted: #aab8c9;
    --line: rgba(255, 255, 255, 0.13);
    --link: #9dbdff;
    --shadow: 0 22px 54px rgba(0, 0, 0, 0.28);
  }
  body { background: radial-gradient(circle at 15% 0%, rgba(91, 135, 193, 0.18), transparent 36rem), var(--page); }
  ::selection { color: #0d1826; background: #9dbdff; }
}