:root {
  color-scheme: light;
  --ink: #242b35;
  --muted: #586271;
  --line: #dce1e7;
  --accent: #245ba0;
}
* { box-sizing: border-box; }
body { margin: 0; background: #fff; color: var(--ink); font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: #173c6c; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.wrap { max-width: 980px; padding: 0 32px; margin: auto; }
.skip { position: absolute; top: -90px; left: 14px; padding: 9px 13px; background: var(--ink); color: white; }
.skip:focus { top: 10px; }
nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line); }
nav a { text-decoration: none; }
.brand { font-size: 15px; font-weight: 600; color: var(--ink); }
.nav-links { display: flex; gap: 24px; font-size: 13px; }
.hero { padding: 34px 0 24px; }
h1 { font-size: 36px; font-weight: 650; line-height: 1.25; letter-spacing: -.025em; margin: 0 0 12px; }
.hero .statement { font-size: 18px; margin: 0 0 12px; }
.hero .detail { max-width: 760px; color: var(--muted); margin: 0; }
.links { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 14px; margin: 18px 0; }
.meta { font-size: 12px; color: var(--muted); display: flex; gap: 8px 22px; flex-wrap: wrap; }
.figure { margin: 0 0 36px; }
.figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
.figure figcaption { padding-top: 9px; font-size: 12px; color: var(--muted); }
section { border-top: 1px solid var(--line); padding: 28px 0 32px; }
section h2 { font-size: 23px; font-weight: 650; line-height: 1.45; margin: 0 0 18px; }
.body { min-width: 0; max-width: 800px; }
.body p { margin: 0 0 16px; }
.body p:last-child { margin-bottom: 0; }
.body h3 { font-size: 18px; margin: 24px 0 10px; }
.body ol, .body ul { padding-left: 24px; }
.body li + li { margin-top: 8px; }
table { border-collapse: collapse; width: 100%; margin: 22px 0; font-size: 14px; line-height: 1.6; }
caption { font-size: 12px; color: var(--muted); text-align: left; margin-bottom: 8px; }
th { font-weight: 600; text-align: left; background: #f5f7fa; }
th, td { padding: 11px 12px; vertical-align: top; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
pre { background: #f5f7fa; border: 1px solid var(--line); color: var(--ink); padding: 16px 18px; white-space: pre-wrap; overflow-wrap: anywhere; font: 13px/1.8 ui-monospace, SFMono-Regular, Menlo, monospace; margin: 22px 0; }
code { font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }
p code, li code, td code { padding: 1px 4px; background: #eef1f5; overflow-wrap: anywhere; }
.steps { margin: 18px 0; }
.steps > div { border-bottom: 1px solid var(--line); padding: 12px 0; }
.steps > div:first-child { padding-top: 0; }
.steps b { display: block; font-weight: 600; }
.steps p { color: var(--muted); font-size: 14px; margin: 4px 0 0; }
.refs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 26px; margin: 22px 0; }
.refs a { padding: 10px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.refs a:hover b { text-decoration: underline; }
.refs b { display: block; font-size: 14px; font-weight: 600; }
.refs small { display: block; color: var(--muted); font-size: 12px; margin-top: 3px; }
.note { padding: 12px 16px; background: #f5f7fa; color: var(--muted); margin: 22px 0; font-size: 14px; }
.next { border-top: 1px solid var(--line); padding: 24px 0 36px; display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: baseline; justify-content: space-between; font-size: 14px; }
.next > span { color: var(--muted); }
footer { border-top: 1px solid var(--line); padding: 18px 0 28px; font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; }
@media (max-width: 600px) {
  .wrap { padding: 0 20px; }
  nav { min-height: 60px; gap: 14px; }
  .brand { font-size: 13px; }
  .nav-links { gap: 14px; font-size: 12px; }
  .hero { padding: 26px 0 22px; }
  h1 { font-size: 30px; }
  .hero .statement { font-size: 17px; }
  .hero .detail { font-size: 15px; }
  section { padding: 24px 0 28px; }
  section h2 { font-size: 21px; }
  .figure { margin-bottom: 28px; }
  .refs { grid-template-columns: 1fr; gap: 8px; }
  table { font-size: 13px; }
  th, td { padding: 10px 8px; }
  .next { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }