/* moonhttp —— 一个 HTTP 库的站。

   纸是霜色，墨是缥青，唯一的彩色是云山蓝与星蓝。
   没有阴影，没有渐变，没有半透明：面就是面，线就是线。
   右上与左下的短线是这套版式的记号，出现在页眉与页脚。 */

:root {
  color-scheme: light;
  --wall: #e8f4f8;        /* 霜色 —— 墙 */
  --wall-2: #e0e7ef;      /* 月魄 —— 次面 */
  --wall-3: #c3d7df;      /* 井天蓝 —— 重线 / 深面 */
  --rule: #d0dfe6;        /* 远天蓝 —— 发丝线 */
  --mist: #d0e7f9;        /* 霜华 —— 提亮 */
  --sea: #c6e6e8;         /* 海天蓝 */
  --silk: #a8c9e4;        /* 缥色 —— 短线 */
  --star: #93b5cf;        /* 星蓝 —— 标签 */
  --accent: #2f90b9;      /* 云山蓝 —— 强调 */
  --jade: #4b9cd3;        /* 瑶碧 —— 链接悬停 */
  --deep: #2b5f7c;        /* 缥青 —— 标题 / 深面 */
  --ink: #142c36;
  --ink-2: #45656f;
  --comment: #5d8494;
  --surface: #f6fbfc;
  --code: #edf6f8;
  --on-deep: #e8f4f8;
  --panel-deep: #2b5f7c;
  --tile-1: #a8c9e4;
  --tile-2: #6c9bca;
  --tile-3: #2f90b9;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "HarmonyOS Sans SC", "Noto Sans SC", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  /* 五大名窑：只给方法用 */
  --ru: #6c9bca;          /* 汝窑 天青 */
  --guan: #86a1a7;        /* 官窑 蟹壳青 */
  --ge: #f4ce69;          /* 哥窑 炒米黄 */
  --jun: #ba2f7b;         /* 钧窑 玫瑰紫 */
  --ding: #fffef8;        /* 定窑 牙白 */
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --wall: #0d232d;
    --wall-2: #12313d;
    --wall-3: #1b4150;
    --rule: #244a57;
    --mist: #16394a;
    --sea: #1a4050;
    --silk: #3a6478;
    --star: #7fa5b8;
    --accent: #7cc2da;
    --jade: #9ccbe6;
    --deep: #d6ecf4;
    --ink: #e9f3f6;
    --ink-2: #a6c1cc;
    --comment: #8fb3c2;
    --surface: #10303c;
    --code: #0f2a35;
    --on-deep: #e9f3f6;
    --panel-deep: #16404f;
    --tile-1: #3a6478;
    --tile-2: #5f8cad;
    --ding: #f6fbfc;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background: var(--wall);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15.5px;
  line-height: 1.72;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 读者看到的就是要敲的字符 */
html, button, input, textarea, select, code, pre, kbd, samp {
  font-variant-ligatures: no-contextual;
}

code, pre, kbd, .mono { font-family: var(--mono); }

::selection { background: var(--mist); color: var(--ink); }

a { color: var(--deep); text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* 滚动条 */
@supports not selector(::-webkit-scrollbar) {
  * { scrollbar-width: thin; scrollbar-color: var(--wall-3) transparent; }
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--wall-3);
  border-radius: 6px;
  border: 3px solid var(--wall);
}
::-webkit-scrollbar-thumb:hover { background: var(--silk); }

img, svg { display: block; max-width: 100%; }

/* ---------------------------------------------------------------- 骨架 */

.page {
  width: min(1240px, 100% - 96px);
  margin-inline: auto;
}
@media (width <= 860px) {
  .page { width: min(1240px, 100% - 40px); }
}

.top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--wall);
  border-bottom: 1px dashed var(--rule);
}
.top-in {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 66px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }
.brand .tile {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--panel-deep);
  display: grid;
  place-content: center;
  gap: 2px;
  flex: none;
}
.brand .tile i {
  display: block;
  width: 9px;
  height: 1.5px;
  background: var(--on-deep);
  border-radius: 1px;
}
.brand .tile i:nth-child(2) { width: 6px; }
.brand .tile i:nth-child(3) { width: 3px; }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav a {
  color: var(--ink-2);
  font-size: 13.5px;
  padding: 7px 11px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.nav a:hover { color: var(--ink); background: var(--wall-2); }
.nav a.on { color: var(--ink); font-weight: 500; }
.nav a.on::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}
.nav .gh { padding: 7px; }
.nav .gh svg { width: 17px; height: 17px; }

/* 右上 / 左下的短线 */
.tick { position: absolute; pointer-events: none; }
.tick-tr { top: 26px; right: 0; }
.tick-meta { flex: none; }
.tick-meta path { fill: none; stroke-width: 1.8; }
.tick path { fill: none; stroke-width: 1.15; }
.tick .a { stroke: var(--star); stroke-dasharray: 16 9; }
.tick .b { stroke: var(--silk); stroke-dasharray: 9 7; }
.tick .c { stroke: var(--accent); stroke-dasharray: 4 6; }
.tick-meta .a { stroke: var(--star); stroke-dasharray: 10 5; }
.tick-meta .b { stroke: var(--silk); stroke-dasharray: 7 4; }
.tick-meta .c { stroke: var(--accent); stroke-dasharray: 2 4; }

/* ---------------------------------------------------------------- 字 */

.label {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0;
}
.label b { color: var(--accent); font-weight: 500; }

h1, h2, h3, h4 {
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

.display {
  font-size: clamp(40px, 5.5vw, 70px);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.035em;
}
.display b { font-weight: 700; color: var(--deep); }

.lede {
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.68;
  max-width: 58ch;
  margin: 22px 0 0;
}

p { margin: 0 0 16px; }
p:last-child { margin-bottom: 0; }

main { display: block; }

/* ---------------------------------------------------------------- 页眉 */

.masthead {
  position: relative;
  padding: 92px 0 64px;
}
.masthead .label { margin-bottom: 26px; }
.masthead .display { max-width: 20ch; }
.masthead .meta {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: center;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--star);
}
.masthead .meta i { color: var(--wall-3); font-style: normal; }

/* ---------------------------------------------------------------- 首页：主视觉 */

.hero {
  position: relative;
  padding: 78px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  gap: 64px;
  align-items: start;
}
.hero-copy .display { margin-top: 24px; }
.hero-copy .lede { margin-top: 24px; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 46px;
  padding: 0 22px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 500;
  border: 1px solid transparent;
}
.btn-solid { background: var(--panel-deep); color: var(--on-deep); }
.btn-solid:hover { background: var(--deep); color: var(--on-deep); }
.btn-ghost { border-color: var(--wall-3); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--deep); color: var(--deep); background: var(--surface); }
.btn .arw { font-family: var(--mono); font-size: 13px; }

.install {
  margin-top: 26px;
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
  align-items: center;
  gap: 10px 14px;
  background: var(--surface);
  border: 1px dashed var(--silk);
  border-radius: 10px;
  padding: 9px 10px 9px 16px;
}
.install .sh { font-family: var(--mono); font-size: 13px; color: var(--star); }
.install code { font-size: 13.5px; color: var(--ink); }
.install button {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: var(--wall-2);
  border: 0;
  border-radius: 6px;
  padding: 6px 9px;
  cursor: pointer;
}
.install button:hover { background: var(--mist); color: var(--deep); }
.install button.ok { background: var(--deep); color: var(--on-deep); }

/* 深色标本板 */
.specimen {
  margin: 0;
  background: var(--panel-deep);
  border-radius: 16px;
  padding: 26px 28px 22px;
  color: var(--on-deep);
}
.specimen .part { display: block; }
.specimen-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--on-deep) 62%, var(--panel-deep));
  padding-bottom: 14px;
  border-bottom: 1px dashed color-mix(in srgb, var(--on-deep) 28%, var(--panel-deep));
}
.specimen .part + .part {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed color-mix(in srgb, var(--on-deep) 28%, var(--panel-deep));
}
.specimen pre {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.9;
  white-space: pre;
  overflow-x: auto;
  color: var(--on-deep);
}
.specimen pre b { color: #fff; font-weight: 500; }
.specimen pre .f { color: #bfe0ea; }
.ruler {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--on-deep) 55%, var(--panel-deep));
}
.ruler span { flex: 1; border-top: 1px dashed color-mix(in srgb, var(--on-deep) 34%, var(--panel-deep)); padding-top: 6px; }
.ruler span:last-child { flex: 0 0 auto; border: 0; padding: 0 0 0 0; }
.specimen a {
  color: var(--on-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--on-deep) 55%, var(--panel-deep));
}
.specimen a:hover { color: #fff; }
.specimen figcaption {
  margin-top: 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: color-mix(in srgb, var(--on-deep) 74%, var(--panel-deep));
}

/* 数字条 */
.facts {
  margin: 76px 0 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.facts div {
  padding: 22px 0 24px;
  border-left: 1px dashed var(--rule);
  padding-left: 26px;
}
.facts div:first-child { border-left: 0; padding-left: 0; }
.facts .n {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 300;
  letter-spacing: -0.03em;
  color: var(--deep);
  line-height: 1.1;
}
.facts .n small { font-size: 13px; letter-spacing: 0; color: var(--star); margin-left: 6px; }
.facts .sub { margin-top: 5px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.06em; color: var(--star); }
.facts .t {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
}

/* ---------------------------------------------------------------- 章节 */

.section { position: relative; padding: 84px 0 0; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: end;
  padding-bottom: 26px;
  border-bottom: 1px dashed var(--rule);
}
.section-head .label { margin-bottom: 14px; }
.section-head h2 { font-size: clamp(26px, 2.6vw, 34px); }
.section-head > p { color: var(--ink-2); font-size: 14.5px; margin: 0; max-width: 44ch; justify-self: end; }

/* 特性：虚线格 */
.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0;
}
.feature {
  border-bottom: 1px dashed var(--rule);
  border-left: 1px dashed var(--rule);
  padding: 30px 30px 34px;
}
.feature:nth-child(3n + 1) { border-left: 0; padding-left: 0; }
.feature .idx {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--ink-2);
}
.feature h3 { margin: 14px 0 10px; font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.feature p { color: var(--ink-2); font-size: 13.8px; line-height: 1.66; margin: 0; }
.feature .spec {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  color: var(--deep);
}

/* ---------------------------------------------------------------- 图 */

.plate {
  margin: 30px 0 0;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 30px 32px 24px;
}
.plate-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--rule);
}
.plate-top .label { color: var(--star); }
.plate-top .label b { color: var(--deep); }
.plate-top .legend { font-family: var(--mono); font-size: 10px; color: var(--star); letter-spacing: 0.08em; }

/* 报文解剖 */
.anatomy { margin: 22px 0 0; font-family: var(--mono); font-size: 13px; line-height: 2.1; }
.anatomy .ln { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: 32px; align-items: baseline; }
.anatomy .ln > span:first-child { white-space: pre; overflow-x: auto; color: var(--ink); }
.anatomy .ln > .anote { font-family: var(--mono); font-size: 10.5px; color: var(--comment); letter-spacing: 0.03em; line-height: 1.5; }
.anatomy .ln.head > span:first-child { color: var(--deep); font-weight: 500; }
.anatomy .ln.blank > span:first-child { color: var(--star); }
.anatomy .ln.body > span:first-child { color: var(--ink-2); }
.anatomy .ln + .ln { border-top: 1px dotted var(--rule); }
@media (width <= 860px) {
  .anatomy .ln { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .anatomy .ln > .anote { padding-bottom: 4px; }
}

/* ---------------------------------------------------------------- 代码 */

.code {
  margin: 26px 0 0;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow: hidden;
}
.code-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px 8px 16px;
  background: var(--wall-2);
  border-bottom: 1px solid var(--rule);
}
.code-top span {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.code-top button {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 3px 7px;
  cursor: pointer;
}
.code-top button:hover { border-color: var(--silk); color: var(--deep); }
.code-top button.ok { background: var(--deep); border-color: var(--deep); color: var(--on-deep); }
.code pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 12.8px;
  line-height: 1.85;
  color: var(--ink);
  tab-size: 2;
}
.code pre .c { color: var(--comment); }
.code pre .k { color: var(--jade); }
.code pre .s { color: var(--deep); }
.code pre .n { color: var(--panel-deep); }

.out {
  margin: 12px 0 0;
  padding: 12px 18px 14px;
  border-left: 2px dashed var(--silk);
  font-family: var(--mono);
  font-size: 12.4px;
  line-height: 1.85;
  color: var(--ink-2);
  white-space: pre-wrap;
  overflow-x: auto;
}
.out::before {
  content: "output";
  display: block;
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--star);
  margin-bottom: 6px;
}

code {
  font-size: 0.88em;
  background: var(--wall-2);
  color: var(--deep);
  border-radius: 4px;
  padding: 0.12em 0.36em;
}
pre code, .code code, .out code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* 方法徽记：五大名窑 */
.method {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.09em;
  padding: 2px 7px 1px;
  border-radius: 4px;
  color: #fff;
  background: var(--ru);
  vertical-align: 1px;
}
.m-get { background: var(--ru); color: #fff; }
.m-head { background: var(--guan); color: #fff; }
.m-post { background: var(--jun); color: #fff; }
.m-put { background: var(--ge); color: #444200; }
.m-patch { background: var(--star); color: #142c36; }
.m-delete { background: var(--deep); color: #fff; }
.m-options { background: var(--accent); color: #fff; }
.m-connect { background: #007cc8; color: #fff; }
.m-trace { background: var(--jade); color: #fff; }
@media (prefers-color-scheme: dark) {
  .m-put { color: #3a3100; }
  .m-patch { color: #0d232d; }
}

/* ---------------------------------------------------------------- 索引 */

.index {
  margin-top: 26px;
  display: grid;
  grid-auto-flow: column;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(10, auto);
  column-gap: 64px;
}
.index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  color: var(--ink);
}
.index a:hover { color: var(--deep); }
.index a:hover .lead { border-bottom-color: var(--silk); }
.index .nm { font-family: var(--mono); font-size: 13px; color: var(--deep); }
.index .lead { flex: 1; border-bottom: 1px dashed var(--rule); transform: translateY(-4px); }
.index .sp { font-family: var(--mono); font-size: 10.5px; color: var(--star); letter-spacing: 0.03em; }

/* ---------------------------------------------------------------- 页脚 */

.foot {
  position: relative;
  margin-top: 96px;
  border-top: 1px solid var(--rule);
  padding: 46px 0 54px;
}
.foot-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 0.6fr));
  gap: 40px;
}
.foot h4 {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--star);
  font-weight: 500;
  margin: 0 0 14px;
}
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.foot li a { color: var(--ink-2); font-size: 13.5px; }
.foot li a:hover { color: var(--deep); }
.foot .about p { color: var(--ink-2); font-size: 13.5px; max-width: 34ch; }
.foot .about .brand { margin-bottom: 14px; }
.foot .meta {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px dashed var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--star);
}

/* ---------------------------------------------------------------- 指南 */

.doc {
  display: grid;
  grid-template-columns: 208px minmax(0, 1fr);
  gap: 72px;
  align-items: start;
}
.rail {
  position: sticky;
  top: 96px;
  font-family: var(--mono);
  font-size: 12px;
  padding-bottom: 40px;
}
.rail .label { margin-bottom: 16px; }
.rail nav { display: grid; gap: 1px; }
.rail nav a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 4px;
  color: var(--ink-2);
  padding: 6px 0 6px 12px;
  border-left: 1px dashed var(--rule);
  line-height: 1.45;
}
.rail nav a span { color: var(--star); font-size: 10.5px; padding-top: 1px; }
.rail nav a:hover { color: var(--ink); border-left-color: var(--silk); }
.rail nav a.on { color: var(--deep); border-left: 2px solid var(--accent); padding-left: 11px; }
.rail nav a.on span { color: var(--accent); }

.step { padding: 0 0 64px; margin-bottom: 64px; border-bottom: 1px dashed var(--rule); scroll-margin-top: 96px; }
.step:last-of-type { border-bottom: 0; }
.step-no {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--ink-2);
  display: block;
  margin-bottom: 16px;
}
.step h2 { font-size: clamp(23px, 2.2vw, 28px); margin-bottom: 18px; }
.step p { color: var(--ink-2); max-width: 72ch; }
.step p strong { color: var(--ink); font-weight: 600; }
.step ul { color: var(--ink-2); max-width: 72ch; padding-left: 20px; }
.step li { margin-bottom: 8px; }
.note {
  margin: 26px 0 0;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 0 10px 10px 0;
  font-size: 13.5px;
  color: var(--ink-2);
  max-width: 72ch;
}
.note b { color: var(--ink); font-weight: 600; }

table.tbl {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
  font-size: 13.5px;
}
.tbl th {
  text-align: left;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 500;
  padding: 0 16px 10px 0;
  border-bottom: 1px solid var(--rule);
}
.tbl td {
  padding: 11px 16px 11px 0;
  border-bottom: 1px dotted var(--rule);
  vertical-align: top;
  color: var(--ink-2);
}
.tbl td:first-child { color: var(--ink); font-family: var(--mono); font-size: 12.5px; }
.tbl tr:last-child td { border-bottom: 0; }

/* ---------------------------------------------------------------- 图版页 */

.fig { margin: 0 0 64px; }
.fig-head { display: flex; align-items: baseline; gap: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--rule); }
.fig-head .no { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; color: var(--accent); }
.fig-head h2 { font-size: 22px; font-weight: 500; }
.fig-head .tag { margin-left: auto; font-family: var(--mono); font-size: 10px; color: var(--comment); letter-spacing: 0.06em; }
.fig .plate { margin-top: 0; }
.fig-notes {
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 40px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px dashed var(--rule);
  color: var(--ink-2);
  font-size: 14px;
}
.fig-notes .label { padding-top: 2px; }
.fig-notes p { max-width: 78ch; }
.fig-notes p + p { margin-top: 10px; }
.fig-notes b { color: var(--ink); font-weight: 600; }
@media (width <= 860px) {
  .fig-notes { grid-template-columns: minmax(0, 1fr); gap: 10px; }
}

/* 缓存的年龄：一台小计算器 */
.calc {
  margin-top: 26px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 26px 28px;
}
.calc-rows { display: grid; gap: 18px; }
.calc-row { display: grid; grid-template-columns: 190px minmax(0, 1fr) 64px; gap: 20px; align-items: center; }
.calc-row label { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }
.calc-row output { font-family: var(--mono); font-size: 12.5px; color: var(--deep); text-align: right; }
input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 2px;
  background: var(--silk);
  border-radius: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--panel-deep);
  border: 0;
  cursor: ew-resize;
}
input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--panel-deep);
  border: 0;
  cursor: ew-resize;
}
.calc-sum {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--rule);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.calc-sum .k { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2); }
.calc-sum .v { font-family: var(--mono); font-size: 24px; font-weight: 300; color: var(--deep); margin-top: 4px; }
.calc-verdict {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 7px 12px;
  border-radius: 7px;
  background: var(--mist);
  color: var(--deep);
}
.calc-verdict .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.calc-verdict.stale { background: var(--wall-2); color: var(--ink-2); }
.calc-verdict.stale .dot { background: var(--star); }
.formula {
  margin-top: 22px;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.9;
  color: var(--ink-2);
}
.formula b { color: var(--ink-2); font-weight: 500; }

/* ---------------------------------------------------------------- API */

.ref { min-width: 0; }
.api {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}
.apirail {
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-bottom: 30px;
  border-right: 1px dashed var(--rule);
  padding-right: 20px;
}
.search {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 9px;
  margin-bottom: 18px;
}
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12.5px;
  outline: none;
}
.search input::placeholder { color: var(--star); }
.search .slash {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--star);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1px 5px;
}
.apirail nav { display: grid; gap: 1px; }
.apirail a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 2px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  padding: 5px 0 5px 10px;
  border-left: 1px dashed var(--rule);
}
.apirail a span { color: var(--star); font-size: 9.5px; padding-top: 2px; }
.apirail a:hover { color: var(--ink); border-left-color: var(--silk); }
.apirail a.on { color: var(--deep); border-left: 2px solid var(--accent); padding-left: 9px; }
.apirail a.on span { color: var(--accent); }
.apirail .count {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--star);
}

.pkg { padding-top: 56px; margin-top: 8px; border-top: 1px dashed var(--rule); scroll-margin-top: 90px; }
.pkg:first-of-type { border-top: 0; padding-top: 30px; }
.pkg-head { display: grid; grid-template-columns: 84px minmax(0, 1fr) auto; gap: 18px; align-items: baseline; }
.pkg-head .no { font-family: var(--mono); font-size: 10.5px; color: var(--star); letter-spacing: 0.08em; }
.pkg-head h2 { font-family: var(--mono); font-size: 22px; font-weight: 500; letter-spacing: -0.01em; }
.pkg-head h2 .at { color: var(--star); }
.pkg-head .spec { font-family: var(--mono); font-size: 10px; color: var(--comment); letter-spacing: 0.06em; text-align: right; }
.pkg-desc { color: var(--ink-2); margin: 12px 0 0 102px; max-width: 78ch; font-size: 14px; }

.item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 18px;
  padding: 15px 0 16px 0;
  border-top: 1px dotted var(--rule);
  margin-top: 0;
}
.item:first-of-type { margin-top: 22px; }
.item > div { min-width: 0; }
.item .kind {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--star);
  padding-top: 4px;
}
.item[data-k="fn"] .kind { color: var(--accent); }
.item[data-k="struct"] .kind { color: var(--deep); }
.item[data-k="enum"] .kind { color: var(--jade); }
.item[data-k="let"] .kind { color: var(--star); }
.sig {
  margin: 0;
  max-width: 100%;
  font-size: 12.8px;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--ink);
  padding-bottom: 2px;
}
.sig .k { color: var(--jade); }
.sig .ty { color: var(--deep); }
.sig .op { color: var(--star); }
.item .item-doc { margin: 7px 0 0; color: var(--ink-2); font-size: 13.6px; max-width: 80ch; }
.item .item-doc code { font-size: 0.86em; }
.hidden { display: none !important; }
.empty {
  padding: 40px 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--star);
}

/* ---------------------------------------------------------------- 窄屏 */

@media (width <= 1100px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 44px; padding-top: 56px; }
  .specimen { max-width: 640px; }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: 14px; align-items: start; }
  .section-head > p { justify-self: start; }
  .doc { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .rail { position: static; order: -1; border-bottom: 1px dashed var(--rule); padding-bottom: 24px; }
  .rail nav { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 16px; }
  .api { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .apirail { position: static; max-height: none; border-right: 0; border-bottom: 1px dashed var(--rule); padding: 0 0 20px; margin-bottom: 10px; }
  .apirail nav { grid-template-columns: repeat(3, minmax(0, 1fr)); column-gap: 12px; }
}

@media (width <= 860px) {
  body { font-size: 15px; }
  .install code { font-size: 12px; }
  .top-in { height: 56px; gap: 8px; min-width: 0; }
  .brand { gap: 8px; font-size: 14px; }
  .brand .tile { width: 20px; height: 20px; }
  .nav { gap: 0; }
  .nav a { padding: 6px 7px; font-size: 12px; }
  .nav .gh { padding: 6px; }
  .nav a.on::before { display: none; }
  .masthead { padding: 56px 0 44px; }
  .masthead .display { max-width: none; }
  .hero { padding-top: 40px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts div:nth-child(3) { border-left: 0; padding-left: 0; }
  .facts div:nth-child(n + 3) { border-top: 1px dashed var(--rule); }
  .features { grid-template-columns: minmax(0, 1fr); }
  .feature { border-left: 0; padding-left: 0; }
  .plate { padding: 22px 18px 18px; }
  .index { grid-auto-flow: row; grid-template-columns: minmax(0, 1fr); grid-template-rows: none; }
  .foot-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; }
  .foot .about { grid-column: 1 / -1; }
  .tick-tr { top: 8px; transform: scale(0.7); transform-origin: top right; }
  .calc-row { grid-template-columns: minmax(0, 1fr) 56px; gap: 8px 12px; }
  .calc-row label { grid-column: 1 / -1; }
  .calc-row output { grid-column: 2; grid-row: 2; }
  .calc-row input { grid-column: 1; grid-row: 2; }
  .calc-sum { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .item { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .pkg-desc { margin-left: 0; }
  .pkg-head { grid-template-columns: 26px minmax(0, 1fr); gap: 10px; }
  .pkg-head .spec { grid-column: 1 / -1; text-align: left; }
  .apirail nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 九字节的八位字节条：HTTP/2 用 */
.octets { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 4px; font-family: var(--mono); }
.octets .o {
  background: var(--mist);
  border-radius: 5px;
  min-height: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2px;
  padding: 4px 2px;
  text-align: center;
  color: var(--deep);
  font-size: 8.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.octets .o b { font-size: 10px; font-weight: 500; letter-spacing: 0.02em; }
.octets .o.op { background: var(--sea); }
.octets .o.data { background: var(--wall-3); color: var(--ink); }
.octets .span3 { grid-column: span 3; }
.octets .span4 { grid-column: span 4; }
.octet-nums {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 4px;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 9px;
  color: var(--star);
  text-align: center;
}

/* 一条跨越消息边界的流 */
.stream { margin: 0; font-family: var(--mono); font-size: 11px; }
.stream .row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr) 104px;
  gap: 14px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px dashed var(--rule);
}
.stream .row:first-child { border-top: 1px dashed var(--rule); }
.stream .tag { color: var(--ink-2); font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; }
.stream .bar {
  height: 38px;
  background: var(--mist);
  border-radius: 6px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  color: var(--deep);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
}
.stream .cut { color: var(--star); text-align: right; text-decoration: line-through; text-decoration-color: var(--accent); text-decoration-thickness: 1px; }
.stream-note { margin: 16px 0 0; color: var(--ink-2); font-size: 11.5px; line-height: 1.6; }
@media (width <= 860px) {
  .stream .row { grid-template-columns: minmax(0, 1fr) 88px; }
  .stream .tag { grid-column: 1 / -1; }
  .octets { grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 2px; }
  .octets .o { min-height: 40px; font-size: 7px; padding: 2px 1px; }
  .octets .o b { font-size: 8.5px; }
}

/* 一个八位字节里的比特：一列 = 一位 */
.bits {
  display: grid;
  grid-template-columns: 52px repeat(8, minmax(0, 1fr));
  gap: 4px;
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 8.5px;
}
.bits .bn { display: flex; align-items: center; color: var(--star); font-size: 10px; letter-spacing: 0.04em; }
.bits .bcell {
  background: var(--mist);
  border-radius: 4px;
  min-height: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2px;
  padding: 2px;
  color: var(--deep);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: center;
}
.bits .bcell b { font-size: 10px; font-weight: 500; letter-spacing: 0; }
.bits .bcell.op { background: var(--sea); }
.bits .b4 { grid-column: span 4; }
.bits .b7 { grid-column: span 7; }
.octets .span2 { grid-column: span 2; }
.octets .o.mask { background: var(--wall-2); color: var(--ink-2); }
@media (width <= 860px) {
  .bits { grid-template-columns: 34px repeat(8, minmax(0, 1fr)); gap: 2px; font-size: 7px; }
  .bits .bcell { min-height: 34px; }
  .bits .bcell b { font-size: 8.5px; }
}

/* The page scroll bar shows while the page moves or under the pointer and
   hides a moment after; it keeps its place, so nothing shifts. */
@supports selector(::-webkit-scrollbar) {
  html:not(.scrolling)::-webkit-scrollbar-thumb { background: transparent; border-color: transparent; box-shadow: none; }
}
@supports not selector(::-webkit-scrollbar) {
  html:not(.scrolling) { scrollbar-color: transparent transparent; }
}