:root {
  --paper: #efe6d4;
  --paper-2: #f7f1e4;
  --ink: #1e1a16;
  --muted: #5e564c;
  --line: #d5c7b0;
  --stamp: #8e2d22;
  --stamp-soft: #f6e2dc;
  --pine: #1d4a38;
  --pine-soft: #e3f0e8;
  --amber: #8a5a12;
  --amber-soft: #f8ecd3;
  --code: #241e19;
  --code-ink: #f3ead7;
  --shadow: 0 18px 40px rgba(48, 32, 18, 0.06);
  --serif: Palatino, "Palatino Linotype", "Songti SC", "Noto Serif SC", serif;
  --sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Mono", "Sarasa Mono SC", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html[lang="en"] .zh { display: none !important; }
html:not([lang="en"]) .en { display: none !important; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(142, 45, 34, 0.08), transparent 55%),
    linear-gradient(180deg, #f4ecdc 0%, var(--paper) 220px);
}
a { color: var(--stamp); text-underline-offset: 3px; }
a:hover { color: #6d2119; }
.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--ink);
  color: var(--paper-2);
  padding: 6px 10px;
}
.skip:focus { top: 12px; z-index: 5; }

.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
.top {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 241, 228, 0.9);
  position: sticky;
  top: 0;
  z-index: 2;
  backdrop-filter: blur(8px);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}
.brand { text-decoration: none; color: inherit; }
.brand strong {
  display: block;
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}
.brand span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; letter-spacing: 0.04em; }
.nav { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.nav a { color: var(--ink); text-decoration: none; font-size: 15px; }
.nav a[aria-current="page"] { color: var(--stamp); box-shadow: inset 0 -2px 0 var(--stamp); }
.top-tools { display: flex; align-items: center; justify-content: flex-end; gap: 18px; flex-wrap: wrap; }
.lang { display: flex; gap: 6px; }
.lang button { padding: 7px 11px; }
.lang button[aria-pressed="true"] { background: var(--ink); color: #f7f1e4; border-color: var(--ink); }
button[data-copied="1"] .zh,
button[data-copied="1"] .en { display: none !important; }
html:not([lang="en"]) button[data-copied="1"]::after { content: "已复制"; }
html[lang="en"] button[data-copied="1"]::after { content: "Copied"; }

main { padding: 42px 0 72px; }
.kicker {
  margin: 0 0 10px;
  color: var(--stamp);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.02em; line-height: 1.25; }
h1 { font-size: clamp(34px, 4.6vw, 52px); margin: 0 0 16px; max-width: 18em; }
h2 { font-size: 32px; margin: 0 0 12px; }
h3 { font-size: 22px; margin: 0 0 6px; }
.lede { font-size: 20px; max-width: 40em; margin: 0 0 18px; }
.note { color: var(--muted); font-size: 15px; }

.seal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1.5px solid var(--stamp);
  color: var(--stamp);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  margin-bottom: 18px;
}

.grid-3, .grid-2 { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); margin-top: 28px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.card, .panel {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.card p, .panel p { margin: 0; }
.card a.more { display: inline-block; margin-top: 12px; }

.section { margin-top: 72px; scroll-margin-top: 88px; }
.flow { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 0; }
.flow li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.flow b {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 600;
  color: var(--stamp);
  line-height: 1;
}
.flow strong { display: block; font-size: 18px; }
.flow span { color: var(--muted); }
.fork-label {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 22px;
}
.rail { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.rail li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 8px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.rail .n {
  font-family: var(--serif);
  font-size: 28px;
  color: var(--stamp);
  line-height: 1;
}
.bounds { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.bounds ul { margin: 8px 0 0; padding-left: 18px; }
.ok { background: var(--pine-soft); border-color: #b7d4c6; }
.warn { background: var(--amber-soft); border-color: #ead3a4; }
.stop { background: var(--stamp-soft); border-color: #e4c2ba; }

label { display: block; font-size: 14px; font-weight: 650; margin-bottom: 6px; }
.help { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; font-weight: 400; }
.fields { display: grid; gap: 14px; }
.row-2 { display: grid; grid-template-columns: 1.4fr 0.6fr; gap: 12px; }
input[type="text"], input[type="number"], textarea {
  width: 100%;
  border: 1px solid #c9b89c;
  background: #fffdf8;
  color: var(--ink);
  border-radius: 12px;
  padding: 10px 12px;
  font: 16px/1.5 var(--sans);
}
textarea { min-height: 180px; font-family: var(--mono); font-size: 14px; line-height: 1.55; resize: vertical; }
input:focus, textarea:focus { outline: 2px solid #e7b2a8; border-color: var(--stamp); }
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.check input { margin-top: 4px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
button, .button {
  appearance: none;
  border: 0;
  background: var(--ink);
  color: #f7f1e4;
  border-radius: 999px;
  padding: 10px 16px;
  font: 15px/1 var(--sans);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
button.ghost, .button.ghost { background: transparent; color: var(--ink); border: 1px solid #c9b89c; }
button:hover, .button:hover { transform: translateY(-1px); }
button:focus-visible, .button:focus-visible, a:focus-visible { outline: 2px solid var(--stamp); outline-offset: 2px; }

.out { display: grid; gap: 14px; }
.out h3 { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
pre {
  margin: 0;
  padding: 14px;
  overflow: auto;
  border-radius: 12px;
  background: var(--code);
  color: var(--code-ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-all;
}
.msg { border-radius: 12px; padding: 10px 12px; font-size: 14px; }
.msg.error { background: var(--stamp-soft); }
.msg.warn { background: var(--amber-soft); }
.hidden { display: none !important; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: var(--paper-2); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; letter-spacing: 0.04em; color: var(--muted); font-weight: 650; }
tr:last-child td { border-bottom: 0; }

.pkt { display: grid; gap: 10px; }
.pkt-row { display: grid; grid-template-columns: 72px 1fr; gap: 10px; align-items: center; }
.pkt-no { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.segs { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.seg {
  background: #fffdf8;
  border: 1px solid #c9b89c;
  border-radius: 999px;
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 12px;
}
.seg.is-check { border-style: dashed; color: var(--amber); font-family: var(--sans); }
.meta { font-family: var(--mono); font-size: 13px; background: #fffdf8; border-radius: 12px; padding: 10px 12px; border: 1px solid var(--line); word-break: break-all; }

.site-footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
.site-footer p { margin: 0 0 6px; }

@media (max-width: 800px) {
  .grid-3, .grid-2, .bounds, .top-inner { grid-template-columns: 1fr; display: grid; }
  .top-inner { display: grid; padding: 14px 0; }
  .top-tools { justify-content: flex-start; }
  h1 { max-width: none; }
  .row-2, .pkt-row { grid-template-columns: 1fr; }
}