:root {
  --paper: #FAF9F4; --card: #FFFFFF; --ink: #151515; --ink2: #3F3E39; --ink3: #6E6C63; --line: #E3E1D8; --yellow: #FFC53D; --yellow-soft: #FFF4D6;
  --shadow: #151515; --code: #F2F1EB;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #0A0A0C; --card: #151517; --ink: #F4F3EE; --ink2: #D2D0C7; --ink3: #A3A198; --line: #2C2B28; --yellow-soft: #2B2410; --shadow: #000; --code: #1E1E21; color-scheme: dark; }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; display: flex; flex-direction: column; background: var(--paper); color: var(--ink); font: 400 16px/1.8 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 26px; padding: 12px max(16px, 4vw); border-bottom: 1.5px solid var(--ink); }
.brand { display: flex; align-items: center; gap: 10px; font: 700 16px/1 var(--mono); letter-spacing: .16em; text-decoration: none; }
.brand i { width: 17px; height: 17px; background: var(--ink); position: relative; flex: none; }
.brand i::after { content: ""; position: absolute; inset: 4px; background: var(--yellow); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 22px; font-size: 15px; }
.nav a { color: var(--ink3); text-decoration: none; padding: 4px 0; }
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 700; box-shadow: inset 0 -3px 0 var(--yellow); }
.grow { flex: 1; }
.lang { padding: 3px 10px; border: 1.5px solid var(--ink); border-radius: 8px; font-size: 14px; line-height: 1.5; text-decoration: none; white-space: nowrap; }
.lang:hover { background: var(--yellow); color: #151515; border-color: #151515; }
.ed { padding: 3px 10px; border: 1.5px solid var(--line); border-radius: 8px; color: var(--ink3); font-size: 14px; line-height: 1.5; white-space: nowrap; }

.doc { width: 100%; max-width: 780px; margin: 0 auto; padding: 44px max(16px, 4vw) 72px; flex: 1; }
.kicker { margin: 0 0 8px; font: 700 13px/1.3 var(--mono); letter-spacing: .14em; color: var(--ink3); }
h1 { margin: 0 0 8px; font-size: clamp(32px, 6vw, 44px); line-height: 1.2; font-weight: 800; letter-spacing: -.01em; }
.meta { margin: 0 0 22px; color: var(--ink3); font-size: 14px; }
.meta span { white-space: nowrap; }
h2 { margin: 52px 0 12px; font-size: 23px; line-height: 1.35; font-weight: 800; scroll-margin-top: 16px; }
h3 { margin: 28px 0 6px; font-size: 18px; line-height: 1.45; font-weight: 700; }
p { margin: 0 0 12px; color: var(--ink2); }
ul, ol { margin: 0 0 14px; padding-left: 1.35em; color: var(--ink2); }
li + li { margin-top: 6px; }
li > ul { margin: 6px 0 0; }
strong { color: var(--ink); font-weight: 700; }
code { font-family: var(--mono); font-size: .9em; padding: 1px 5px; border-radius: 4px; background: var(--code); overflow-wrap: anywhere; }
.lede { font-size: 17px; }

.tldr { margin: 26px 0 30px; padding: 18px 22px 8px; border: 1.5px solid var(--ink); border-radius: 14px; background: var(--card); box-shadow: 0 4px 0 var(--shadow); }
.tldr .tag { display: inline-block; margin: 0 0 10px; padding: 1px 9px; border: 1.5px solid #151515; border-radius: 6px; background: var(--yellow); color: #151515; font-size: 14px; font-weight: 700; }
.tldr ul { margin-bottom: 10px; }

.toc { margin: 0 0 8px; padding: 14px 20px 14px; border: 1.5px solid var(--line); border-radius: 12px; }
.toc p { margin: 0 0 6px; font-size: 14px; font-weight: 700; color: var(--ink3); }
.toc ol { margin: 0; columns: 2; column-gap: 36px; font-size: 15px; }
.toc li { margin: 0 0 4px; break-inside: avoid; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.tbl { margin: 14px 0 20px; overflow-x: auto; border: 1.5px solid var(--ink); border-radius: 12px; background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 15px; line-height: 1.6; }
th, td { padding: 10px 14px; text-align: left; vertical-align: top; border-top: 1px solid var(--line); overflow-wrap: anywhere; }
thead th { border-top: 0; background: var(--yellow-soft); color: var(--ink); font-size: 14px; font-weight: 700; white-space: nowrap; }
td { color: var(--ink2); }
td:first-child { color: var(--ink); font-weight: 600; min-width: 7.5em; }

.note { margin: 16px 0 18px; padding: 12px 16px; border: 1.5px solid var(--ink); border-radius: 10px; background: var(--yellow-soft); }
.note p:last-child, .note ul:last-child { margin-bottom: 0; }

.contact { margin: 26px 0 34px; padding: 22px; border: 1.5px solid var(--ink); border-radius: 14px; background: var(--card); box-shadow: 0 4px 0 var(--shadow); }
.contact .mail { display: block; margin: 4px 0 10px; font: 700 clamp(20px, 5vw, 26px)/1.3 var(--mono); overflow-wrap: anywhere; text-decoration: none; }
.contact p { margin-bottom: 8px; }
.key { display: inline-flex; align-items: center; justify-content: center; height: 44px; margin-top: 6px; padding: 0 20px; border: 1.5px solid #151515; border-radius: 10px;
  background: var(--yellow); color: #151515; box-shadow: 0 3px 0 var(--shadow); font-size: 16px; font-weight: 700; text-decoration: none; transition: transform .08s, box-shadow .08s; }
.key:active { transform: translateY(3px); box-shadow: 0 0 0 var(--shadow); }
.faq details { margin: 0 0 12px; border: 1.5px solid var(--ink); border-radius: 12px; background: var(--card); }
.faq summary { padding: 13px 44px 13px 16px; font-weight: 700; color: var(--ink); cursor: pointer; list-style: none; position: relative; line-height: 1.5; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font: 700 20px/1 var(--mono); color: var(--ink3); }
.faq details[open] summary::after { content: "−"; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq .a { padding: 12px 16px 4px; }

.foot { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px; padding: 26px max(16px, 6vw) 34px; background: #151515; color: #A3A198; font-size: 13px; line-height: 1.6; }
.foot .brand { color: #F4F3EE; }
.foot .brand i { background: #F4F3EE; }
.foot a { color: #F4F3EE; }

@media (max-width: 600px) {
  .nav { order: 3; flex-basis: 100%; gap: 4px 18px; }
  .doc { padding-top: 30px; }
  h2 { margin-top: 42px; font-size: 21px; }
  .toc ol { columns: 1; }
  .tldr { padding: 16px 16px 6px; }
  th, td { padding: 9px 11px; }
  table { font-size: 14.5px; }
    .tbl.stack { overflow: visible; border: 0; border-radius: 0; background: none; }
  .tbl.stack table, .tbl.stack tbody, .tbl.stack tr, .tbl.stack td { display: block; }
  .tbl.stack thead { display: none; }
  .tbl.stack tr { margin: 0 0 12px; border: 1.5px solid var(--ink); border-radius: 12px; background: var(--card); overflow: hidden; }
  .tbl.stack td { padding: 8px 14px 9px; min-width: 0; }
  .tbl.stack td:first-child { border-top: 0; background: var(--yellow-soft); font-size: 15.5px; }
  .tbl.stack td[data-label]::before { content: attr(data-label); display: block; margin-bottom: 1px; font-size: 12.5px; font-weight: 700; color: var(--ink3); }
}