/* InkBlade documentation site.
   Dark technical sheet: ink-black canvas, slate panels, cool-cyan signal,
   warning-orange actions, serif display type, monospace metadata.
   Local file only — no webfonts, no CDN, no third-party requests. */

:root {
  --bg: #0a0b0d;
  --panel: #111318;
  --panel-2: #15181e;
  --panel-3: #191d24;
  --line: #1e2229;
  --line-2: #262b34;
  --text: #d7dbe0;
  --text-dim: #98a1ab;
  --muted: #6a727c;
  --cyan: #59d3c8;
  --cyan-dim: #2f7d76;
  --orange: #e0733d;
  --orange-dim: #8f4a28;
  --ok: #7fc9a0;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", "Source Serif 4",
    "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  --maxw: 1180px;
  --rail: 252px;
  color-scheme: dark;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(820px 420px at 88% -6%, rgba(89, 211, 200, 0.09), transparent 65%),
    radial-gradient(620px 380px at 0% 12%, rgba(224, 115, 61, 0.05), transparent 60%),
    var(--bg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

/* faint plotter grid, drawn with gradients so nothing is downloaded */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(215, 219, 224, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(215, 219, 224, 0.035) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 25%, transparent 78%);
}

::selection { background: rgba(89, 211, 200, 0.28); color: #eef2f4; }

a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(89, 211, 200, 0.28);
  transition: border-color 120ms ease, color 120ms ease;
}
a:hover { color: #8ce6dd; border-bottom-color: var(--cyan); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background: var(--cyan);
  color: #03211e;
  font-weight: 700;
  z-index: 99;
}
.skip:focus { left: 14px; top: 14px; }

.wrap {
  position: relative;
  z-index: 1;
  width: min(100% - 48px, var(--maxw));
  margin-inline: auto;
}

/* ------------------------------------------------------------------
   top bar
   ------------------------------------------------------------------ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 11, 13, 0.88);
  backdrop-filter: blur(10px);
}

.topbar-in {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 58px;
  padding-block: 7px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  border: 0;
  color: var(--text);
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: 0.01em;
}
.brand:hover { color: var(--text); }
.brand .tick { color: var(--cyan); font-family: var(--mono); font-size: 15px; }
.brand .cn {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--muted);
}

.top-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.top-links::-webkit-scrollbar { display: none; }

.top-links a {
  border: 0;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 6px 10px;
  border-radius: 4px;
  white-space: nowrap;
}
.top-links a:hover { color: var(--text); background: var(--panel-2); }
.top-links a.dl { color: var(--orange); }
.top-links a.dl:hover { background: rgba(224, 115, 61, 0.1); }

.lang {
  display: inline-flex;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  overflow: hidden;
  flex: none;
}

.lang button,
.lang a {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 5px 9px;
  cursor: pointer;
  line-height: 1.5;
}
.lang button[aria-pressed="true"],
.lang a[aria-current="page"] { background: var(--panel-3); color: var(--cyan); }
.lang button:hover,
.lang a:hover { color: var(--text); }

/* ------------------------------------------------------------------
   hero — asymmetric: statement left, spec sheet right
   ------------------------------------------------------------------ */

.hero {
  position: relative;
  z-index: 1;
  padding: 72px 0 46px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(240px, 0.55fr);
  gap: 52px;
  align-items: end;
}

.kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 18px;
}
.kicker::before { content: "// "; color: var(--cyan-dim); }

.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(52px, 8.6vw, 108px);
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin: 0 0 22px;
}

.hero h1 .stroke {
  display: block;
  margin-top: 10px;
  font-size: 0.2em;
  letter-spacing: 0.42em;
  color: var(--muted);
  font-family: var(--mono);
}

.hero .positioning {
  font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.4;
  color: var(--text);
  max-width: 30ch;
  margin: 0 0 16px;
}

.hero .docstate {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin: 0 0 30px;
}
.hero .docstate b { color: var(--text-dim); font-weight: 500; }
.hero .docstate i { color: var(--orange); font-style: normal; }

.quick {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  width: fit-content;
  overflow: hidden;
}

.quick a {
  border: 0;
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  background: var(--panel);
}
.quick a + a { border-left: 1px solid var(--line-2); }
.quick a:hover { background: var(--panel-3); color: var(--text); }
.quick a.primary {
  background: var(--orange);
  color: #200b03;
  font-weight: 700;
}
.quick a.primary:hover { background: #ef8852; color: #200b03; }

.spec {
  border: 1px solid var(--line-2);
  border-top: 2px solid var(--cyan);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  padding: 20px 22px 18px;
}

.spec h2 {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
  font-weight: 500;
}

.spec dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
}
.spec dt { color: var(--muted); }
.spec dd { margin: 0; color: var(--text); }
.spec dd .ok { color: var(--ok); }
.spec .rule {
  height: 1px;
  background: var(--line-2);
  margin: 15px 0;
}
.spec p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  font-family: var(--sans);
}

/* ------------------------------------------------------------------
   shell: fixed rail + content
   ------------------------------------------------------------------ */

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 60px;
  padding: 46px 0 90px;
  align-items: start;
}

.rail {
  position: sticky;
  top: 78px;
  border-left: 1px solid var(--line-2);
  padding-left: 18px;
}

.rail p {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: nav;
}

.rail li { counter-increment: nav; margin: 0 0 2px; }

.rail a {
  display: flex;
  gap: 10px;
  border: 0;
  padding: 5px 8px 5px 0;
  color: var(--text-dim);
  font-size: 13.5px;
  line-height: 1.4;
}
.rail a::before {
  content: counter(nav, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  padding-top: 2px;
  min-width: 18px;
}
.rail a:hover { color: var(--text); }
.rail a.active { color: var(--cyan); }
.rail a.active::before { color: var(--cyan); }

.rail .railnote {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* mobile jump bar */
.jump {
  display: none;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 16px;
  scrollbar-width: none;
}
.jump::-webkit-scrollbar { display: none; }
.jump a {
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 4px 12px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
}
.jump a:hover { color: var(--text); border-color: var(--cyan-dim); }

.content { min-width: 0; max-width: 780px; }

/* ------------------------------------------------------------------
   sections
   ------------------------------------------------------------------ */

.sec {
  padding: 0 0 58px;
  scroll-margin-top: 80px;
}
.sec + .sec {
  border-top: 1px solid var(--line);
  padding-top: 46px;
}

.sec-head { margin-bottom: 20px; }

.sec-no {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 8px;
}
.sec-no::after {
  content: "";
  display: inline-block;
  width: 42px;
  height: 1px;
  background: var(--cyan-dim);
  vertical-align: middle;
  margin-left: 10px;
}

.sec h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(27px, 3.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.sec .sub {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin: 0;
}

.sec h3 {
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text);
  margin: 34px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.sec p,
.sec li { color: var(--text-dim); }
.sec strong { color: var(--text); font-weight: 600; }
.sec em { color: var(--text); }

.sec ul,
.sec ol { padding-left: 20px; }
.sec li { margin: 0 0 7px; }
.sec li::marker { color: var(--cyan-dim); }

.note {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}

/* numbered install steps */
.steps {
  list-style: none;
  margin: 18px 0 8px;
  padding: 0;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 16px 46px;
  margin: 0;
}
.steps li::before {
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--cyan);
  border: 1px solid var(--line-2);
  background: var(--panel);
  width: 30px;
  height: 26px;
  display: grid;
  place-items: center;
}
.steps li::after {
  content: "";
  position: absolute;
  left: 15px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.steps li:last-child::after { display: none; }
.steps li b {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--text);
  margin-bottom: 2px;
}
.steps li span { color: var(--text-dim); font-size: 14.5px; }

/* compact workflow list */
.flow {
  list-style: none;
  margin: 20px 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.flow li {
  display: grid;
  grid-template-columns: 30px 132px minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  margin: 0;
  align-items: baseline;
}

.flow .n {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--cyan);
}
.flow .t {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text);
  letter-spacing: 0.02em;
}
.flow .d { font-size: 14px; color: var(--text-dim); }
.flow .d code { font-size: 12px; }

/* ------------------------------------------------------------------
   terminal blocks
   ------------------------------------------------------------------ */

.term {
  border: 1px solid var(--line-2);
  background: #060708;
  margin: 16px 0;
  border-radius: 4px;
  overflow: hidden;
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid #14171b;
  background: #0c0e10;
}
.term-bar .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #23282f;
}
.term-bar .dot:nth-child(1) { background: rgba(224, 115, 61, 0.55); }
.term-bar .dot:nth-child(2) { background: rgba(89, 211, 200, 0.45); }
.term-bar .label {
  margin-left: 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-transform: uppercase;
}

pre {
  margin: 0;
  padding: 15px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: #cfd6dc;
  tab-size: 2;
}

pre .c { color: #5d6670; }
pre .p { color: var(--cyan); }
pre .o { color: var(--orange); }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  color: #bfe9e4;
  background: rgba(89, 211, 200, 0.07);
  border: 1px solid rgba(89, 211, 200, 0.14);
  padding: 0.5px 5px;
  border-radius: 3px;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.copy {
  position: absolute;
  top: 7px;
  right: 8px;
  border: 1px solid var(--line-2);
  background: rgba(17, 19, 24, 0.92);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 7px;
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms ease;
}
.term { position: relative; }
.term:hover .copy,
.copy:focus-visible { opacity: 1; }
.copy:hover { color: var(--cyan); }

/* ------------------------------------------------------------------
   tables
   ------------------------------------------------------------------ */

.tbl {
  border: 1px solid var(--line);
  margin: 18px 0;
  overflow-x: auto;
  background: var(--panel);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-2);
  white-space: nowrap;
  background: var(--panel-2);
}

td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--text-dim);
  vertical-align: top;
}

tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: rgba(89, 211, 200, 0.025); }

td.num,
th.num {
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
  white-space: nowrap;
}

td code { font-size: 12px; }

.mono-n {
  display: inline-block;
  min-width: 20px;
  margin-right: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}
td .dim { color: var(--muted); font-size: 12.5px; }

/* ------------------------------------------------------------------
   figures / callouts / cards
   ------------------------------------------------------------------ */

.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 22px 0;
}

.figure {
  background: var(--panel);
  padding: 16px 16px 14px;
}
.figure b {
  display: block;
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.figure span {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
}

.cut {
  border: 1px solid var(--line-2);
  border-left: 2px solid var(--cyan);
  background: rgba(89, 211, 200, 0.035);
  padding: 15px 18px;
  margin: 22px 0;
}
.cut p { margin: 0; color: var(--text); font-size: 14.5px; }
.cut p + p { margin-top: 8px; }

.warn {
  border-left-color: var(--orange);
  background: rgba(224, 115, 61, 0.05);
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 22px 0;
}
.split > div {
  background: var(--panel);
  padding: 18px 20px;
}
.split h3 {
  margin: 0 0 8px;
  padding: 0;
  border: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.split ul { margin: 0; padding-left: 18px; }
.split li { font-size: 14px; }

/* ------------------------------------------------------------------
   footer
   ------------------------------------------------------------------ */

.foot {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-2);
  padding: 44px 0 52px;
  font-size: 13.5px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 34px;
}

.foot h4 {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 0 0 5px; }
.foot a { border: 0; color: var(--text-dim); }
.foot a:hover { color: var(--cyan); }
.foot p { color: var(--muted); margin: 0 0 10px; }

.foot-bar {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ------------------------------------------------------------------
   language visibility
   ------------------------------------------------------------------ */

html[data-lang="en"] .lang-block[data-lang="zh"],
html[data-lang="zh"] .lang-block[data-lang="en"] { display: none; }

html:not([data-lang="en"]):not([data-lang="zh"]) .lang-block[data-lang="zh"] { display: none; }

/* ------------------------------------------------------------------
   responsive
   ------------------------------------------------------------------ */

@media (max-width: 1040px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 28px; }
  .rail { display: none; }
  .jump { display: flex; }
  .content { max-width: none; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .hero { padding-top: 52px; }
  .top-links { display: none; }
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .brand .cn { display: none; }
  .hero h1 { font-size: clamp(46px, 15vw, 68px); }
  .flow li { grid-template-columns: 26px minmax(0, 1fr); }
  .flow .d { grid-column: 2; }
  .split { grid-template-columns: minmax(0, 1fr); }
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .quick { width: 100%; }
  .quick a { flex: 1 1 100%; text-align: center; }
  .quick a + a { border-left: 0; border-top: 1px solid var(--line-2); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  a, .copy { transition: none; }
}

@media print {
  body { background: #fff; color: #111; }
  body::before, .topbar, .rail, .jump, .copy, .quick { display: none !important; }
  .shell { display: block; }
  a { color: #111; }
}