/* Layout: sticky reference rail + one reading column; code sits inline under
     each endpoint. One bold move only: the airmail-envelope stripe. */
  :root {
    --paper:   #f4f6f9;   /* page ground, cool white */
    --sheet:   #ffffff;   /* raised surfaces */
    --sheet-2: #eaeef4;   /* headers, inline code */
    --rule:    #d9dfe8;
    --ink:     #121826;
    --muted:   #566175;
    --post:    #1d4ed0;   /* postal blue — the accent */
    --post-sf: #e5ecfc;
    --air:     #cf2f37;   /* airmail red — stripe and postmark only */
    --get:     #13703e;
    --put:     #1d4ed0;
    --del:     #b3262c;
    --warn:    #8a5a00;
    --warn-sf: #fbf1dc;
    --ok-sf:   #e2f3e8;
    --code-bg: #0f1522;
    --code-fg: #dde3ee;
    --code-dim:#7f8aa0;
    --code-str:#9fd18c;
    --code-key:#86b4ff;
    --code-ph: #ffd479;
    --f-display: "Bricolage Grotesque", "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
    --f-body: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    --f-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color-scheme: light;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --paper:#0b1120; --sheet:#121a2b; --sheet-2:#19233a; --rule:#26314a;
      --ink:#e4e9f2; --muted:#93a0b8; --post:#7ea6ff; --post-sf:#17233f;
      --air:#ff6b6f; --get:#53c27b; --put:#7ea6ff; --del:#ff7a72;
      --warn:#e8b75a; --warn-sf:#2b2312; --ok-sf:#13291d;
      --code-bg:#070b15; --code-fg:#dde3ee; --code-dim:#6f7a90;
      --code-str:#9fd18c; --code-key:#86b4ff; --code-ph:#ffd479;
      color-scheme: dark;
    }
  }
  :root[data-theme="dark"] {
    --paper:#0b1120; --sheet:#121a2b; --sheet-2:#19233a; --rule:#26314a;
    --ink:#e4e9f2; --muted:#93a0b8; --post:#7ea6ff; --post-sf:#17233f;
    --air:#ff6b6f; --get:#53c27b; --put:#7ea6ff; --del:#ff7a72;
    --warn:#e8b75a; --warn-sf:#2b2312; --ok-sf:#13291d;
    --code-bg:#070b15; --code-fg:#dde3ee; --code-dim:#6f7a90;
    --code-str:#9fd18c; --code-key:#86b4ff; --code-ph:#ffd479;
    color-scheme: dark;
  }

  * { box-sizing: border-box; }
  body {
    margin: 0; background: var(--paper); color: var(--ink);
    font: 15px/1.62 var(--f-body); -webkit-font-smoothing: antialiased;
  }
  code, pre, kbd { font-family: var(--f-mono); }
  a { color: var(--post); text-underline-offset: 2px; }
  :focus-visible { outline: 2px solid var(--post); outline-offset: 2px; border-radius: 3px; }

  /* ---------- airmail stripe ---------- */
  .airmail {
    height: 7px;
    background: repeating-linear-gradient(
      -45deg,
      var(--air) 0 14px, var(--paper) 14px 21px,
      var(--post) 21px 35px, var(--paper) 35px 42px);
  }

  /* ---------- masthead ---------- */
  .mast { background: var(--sheet); border-bottom: 1px solid var(--rule); }
  .mast-in {
    max-width: 1200px; margin: 0 auto; padding-inline: 20px; padding-block: 34px 30px;
    display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 36px; align-items: center;
  }
  .eyebrow {
    margin: 0 0 12px; font: 600 11px/1 var(--f-mono); letter-spacing: .14em;
    text-transform: uppercase; color: var(--muted);
    display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center;
  }
  .live { display: inline-flex; align-items: center; gap: 6px; color: var(--get); }
  .live::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--get); }
  h1 {
    font: 650 clamp(30px, 4.6vw, 48px)/1.04 var(--f-display);
    letter-spacing: -.025em; margin: 0 0 14px; text-wrap: balance;
  }
  h1 em { font-style: normal; color: var(--post); }
  .lede { margin: 0 0 20px; color: var(--muted); font-size: 16.5px; max-width: 52ch; }
  .mast-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
  .chip {
    display: inline-flex; align-items: center; gap: 8px; font: 500 12.5px var(--f-mono);
    padding: 7px 12px; border-radius: 6px; border: 1px solid var(--rule);
    background: var(--paper); color: var(--ink); min-width: 0; overflow-wrap: anywhere;
  }
  button.btn {
    font: 500 12.5px var(--f-body); cursor: pointer; padding: 7px 12px; border-radius: 6px;
    border: 1px solid var(--rule); background: var(--paper); color: var(--ink);
  }
  button.btn:hover { border-color: var(--post); color: var(--post); }

  /* terminal in the hero */
  .term {
    position: relative; background: var(--code-bg); color: var(--code-fg);
    border-radius: 10px; padding: 16px 18px 18px; font: 12.6px/1.7 var(--f-mono);
    overflow-x: auto; min-width: 0;
  }
  .term .bar { display: flex; gap: 6px; margin-bottom: 12px; }
  .term .bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--code-dim); opacity: .5; }
  .term pre { margin: 0; white-space: pre; }
  .term .out { color: var(--code-str); }
  .term .big { color: var(--code-ph); font-weight: 600; }
  .postmark {
    position: absolute; right: 14px; bottom: 12px; width: 86px; height: 86px;
    border: 2px solid var(--air); border-radius: 50%; opacity: .55; transform: rotate(-14deg);
    display: grid; place-items: center; text-align: center; pointer-events: none;
    font: 600 9px/1.25 var(--f-mono); letter-spacing: .1em; color: var(--air); text-transform: uppercase;
  }
  .postmark b { display: block; font-size: 15px; letter-spacing: .02em; }

  /* ---------- shell ---------- */
  .shell {
    max-width: 1200px; margin: 0 auto; padding-inline: 20px; padding-block: 0 80px;
    display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 48px; align-items: start;
  }
  nav.rail {
    position: sticky; top: calc(env(safe-area-inset-top, 0px) + 16px);
    padding-block: 32px; max-height: calc(100vh - 32px); overflow-y: auto; font-size: 13.5px;
  }
  nav.rail .grp {
    margin: 22px 0 6px; font: 600 10.5px/1 var(--f-mono); letter-spacing: .13em;
    text-transform: uppercase; color: var(--muted);
  }
  nav.rail .grp:first-child { margin-top: 0; }
  nav.rail a {
    display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none;
    padding: 3px 0 3px 11px; border-left: 2px solid var(--rule);
  }
  nav.rail a:hover, nav.rail a.on { color: var(--post); border-left-color: var(--post); }
  nav.rail .m { font: 600 9.5px var(--f-mono); color: var(--muted); width: 32px; flex: none; }

  main { padding-block: 34px; min-width: 0; }
  section { scroll-margin-top: 20px; margin-bottom: 64px; }
  h2 {
    font: 650 25px/1.15 var(--f-display); letter-spacing: -.015em;
    margin: 0 0 8px; text-wrap: balance;
  }
  h3 { font: 600 15.5px/1.3 var(--f-body); margin: 28px 0 10px; }
  .sub { color: var(--muted); margin: 0 0 24px; max-width: 66ch; }
  p { max-width: 68ch; margin: 0 0 14px; }
  code.i {
    font-size: .88em; background: var(--sheet-2); border: 1px solid var(--rule);
    padding: 1px 5px; border-radius: 4px; overflow-wrap: anywhere;
  }
  kbd {
    font-size: 11.5px; padding: 1px 6px; border-radius: 4px; border: 1px solid var(--rule);
    border-bottom-width: 2px; background: var(--sheet);
  }

  /* ---------- facts ---------- */
  .facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 9px; overflow: hidden; margin: 0 0 22px; }
  .fact { background: var(--sheet); padding: 14px 16px; min-width: 0; }
  .fact .n { font: 600 19px/1.2 var(--f-mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
  .fact .l { font-size: 12px; color: var(--muted); margin-top: 3px; }

  /* ---------- endpoint ---------- */
  .ep { border: 1px solid var(--rule); border-radius: 10px; background: var(--sheet); margin-bottom: 18px; overflow: hidden; }
  .ep-h {
    display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
    padding: 12px 16px; background: var(--sheet-2); border-bottom: 1px solid var(--rule);
  }
  .verb {
    font: 600 10.5px/1 var(--f-mono); letter-spacing: .08em; color: #fff;
    padding: 5px 8px; border-radius: 4px; flex: none;
  }
  .verb.get { background: var(--get); } .verb.post { background: var(--put); } .verb.delete { background: var(--del); }
  .path { font: 500 13.6px var(--f-mono); min-width: 0; overflow-wrap: anywhere; }
  .path .pre { color: var(--muted); } .path .v { color: var(--post); }
  .tag { margin-left: auto; font: 500 11px var(--f-mono); color: var(--muted); flex: none; }
  .tag.pub { color: var(--get); }
  .ep-b { padding: 16px 16px 18px; }
  .ep-b > :last-child { margin-bottom: 0; }
  .ep.key { border-color: var(--post); box-shadow: 0 0 0 1px var(--post); }
  .ep.key .ep-h { background: var(--post-sf); }

  /* ---------- tables ---------- */
  .tw { overflow-x: auto; margin: 10px 0 16px; }
  table { width: 100%; border-collapse: collapse; font-size: 13.6px; min-width: 460px; }
  th, td { text-align: left; vertical-align: top; padding: 8px 14px 8px 0; border-bottom: 1px solid var(--rule); }
  th { font: 600 10.5px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
  tbody tr:last-child td { border-bottom: none; }
  td.k { font: 500 13px var(--f-mono); white-space: nowrap; }
  td.t { font: 12px var(--f-mono); color: var(--muted); white-space: nowrap; }
  .req { font: 600 9.5px var(--f-mono); letter-spacing: .06em; color: var(--del); margin-left: 4px; }
  .code-n { font: 600 13px var(--f-mono); font-variant-numeric: tabular-nums; }

  /* ---------- code with language tabs ---------- */
  .code { margin: 12px 0 16px; border-radius: 9px; overflow: hidden; background: var(--code-bg); }
  .code-h { display: flex; align-items: center; gap: 2px; padding: 6px 8px 0; border-bottom: 1px solid rgba(255,255,255,.08); }
  .code-h .cap { font: 600 10px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--code-dim); padding: 6px 8px 8px; margin-right: auto; }
  .code-h button {
    font: 500 11.5px var(--f-mono); cursor: pointer; background: none; border: none;
    color: var(--code-dim); padding: 6px 10px 8px; border-bottom: 2px solid transparent;
  }
  .code-h button[aria-pressed="true"] { color: var(--code-fg); border-bottom-color: var(--code-key); }
  .code-h button.copy { border: 1px solid rgba(255,255,255,.14); border-radius: 5px; padding: 3px 9px; margin: 0 0 6px 6px; }
  .code-h button.copy:hover { color: var(--code-fg); }
  .code pre { margin: 0; padding: 14px 16px 16px; color: var(--code-fg); font: 12.7px/1.65 var(--f-mono); overflow-x: auto; }
  .c { color: var(--code-dim); } .s { color: var(--code-str); } .kw { color: var(--code-key); }
  .ph { color: var(--code-ph); }

  /* ---------- notes ---------- */
  .note { border-left: 3px solid var(--post); background: var(--post-sf); padding: 12px 15px; border-radius: 0 8px 8px 0; margin: 16px 0; font-size: 14px; }
  .note.warn { border-left-color: var(--warn); background: var(--warn-sf); }
  .note p { margin: 0; max-width: none; } .note p + p { margin-top: 6px; }

  /* ---------- key box ---------- */
  .keybox {
    display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px;
    padding: 14px; border: 1px dashed var(--rule); border-radius: 9px; background: var(--sheet); margin: 0 0 16px;
  }
  .keybox label { display: block; font: 600 10.5px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
  .keybox input {
    width: 100%; padding: 8px 10px; border-radius: 6px; border: 1px solid var(--rule);
    background: var(--paper); color: var(--ink); font: 13px var(--f-mono);
  }
  .keybox .hint { grid-column: 1 / -1; font-size: 12.5px; color: var(--muted); margin: 0; }

  /* ---------- status list ---------- */
  .status { display: grid; gap: 8px; margin: 12px 0 18px; }
  .st { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 14px; align-items: start; padding: 11px 14px; background: var(--sheet); border: 1px solid var(--rule); border-radius: 8px; }
  .pill { justify-self: start; font: 600 10.5px/1 var(--f-mono); letter-spacing: .06em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; }
  .pill.ok { background: var(--ok-sf); color: var(--get); }
  .pill.todo { background: var(--warn-sf); color: var(--warn); }
  .st b { display: block; font-weight: 600; }
  .st span.d { color: var(--muted); font-size: 13.5px; }

  .flow { margin: 10px 0 18px; padding: 14px; background: var(--sheet); border: 1px solid var(--rule); border-radius: 9px; overflow-x: auto; }

  footer { border-top: 1px solid var(--rule); padding-block: 22px; color: var(--muted); font-size: 12.5px; display: flex; flex-wrap: wrap; gap: 6px 18px; }

  @media (max-width: 960px) {
    .mast-in { grid-template-columns: minmax(0, 1fr); }
    .shell { grid-template-columns: minmax(0, 1fr); gap: 0; }
    nav.rail {
      position: static; max-height: none; overflow: visible; padding-block: 20px 6px;
      border-bottom: 1px solid var(--rule); display: flex; flex-wrap: wrap; gap: 6px 14px;
    }
    nav.rail .grp { width: 100%; margin: 8px 0 2px; }
    nav.rail a { border-left: none; padding: 2px 0; }
    nav.rail .m { display: none; }
    .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }
  @media (max-width: 520px) {
    .keybox { grid-template-columns: minmax(0, 1fr); }
    .st { grid-template-columns: minmax(0, 1fr); gap: 6px; }
    .postmark { display: none; }
  }
  @media (prefers-reduced-motion: no-preference) {
    nav.rail a { transition: color .12s, border-color .12s; }
  }

a.btn { font: 500 12.5px var(--f-body); padding: 7px 12px; border-radius: 6px; border: 1px solid var(--rule); background: var(--paper); color: var(--ink); text-decoration: none; }
a.btn:hover { border-color: var(--post); color: var(--post); }