/* no framework, no web fonts, no external requests — the page itself has to be fast.
 * that is both the experience and the differentiator: the #1 sites ship 40-110 KB of HTML. */

:root {
  --bg: #ffffff;
  --fg: #14161a;
  --muted: #61656e;
  --line: #e3e6ea;
  --panel: #f7f8fa;
  --code-bg: #f2f4f7;
  --accent: #1d5cff;
  --ok: #0a7a3d;
  --warn: #9a5b00;
  --err: #c02424;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --fg: #e8eaee;
    --muted: #9aa1ad;
    --line: #232a33;
    --panel: #151a21;
    --code-bg: #11161c;
    --accent: #6b9bff;
    --ok: #4ec98a;
    --warn: #e0b054;
    --err: #ff7a7a;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); }
a:hover { text-decoration: none; }

header.site {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  margin-bottom: 22px;
}
header.site .wrap { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
header.site .brand { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--fg); }
header.site nav { margin-left: auto; display: flex; gap: 16px; font-size: 14px; }
header.site nav a { color: var(--muted); text-decoration: none; }
header.site nav a:hover { color: var(--fg); }

h1 { font-size: 27px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 34px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 8px; }
p { margin: 0 0 14px; }
.lede { color: var(--muted); font-size: 16px; margin-bottom: 20px; }

/* ── Tool body ───────────────────────────────────────────── */
.tool { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }

.tabs { display: flex; gap: 2px; background: var(--panel); border-bottom: 1px solid var(--line); overflow-x: auto; }
.tabs button {
  font: inherit; font-size: 14px; padding: 11px 15px; border: 0; background: none;
  color: var(--muted); cursor: pointer; white-space: nowrap; border-bottom: 2px solid transparent;
}
.tabs button[aria-selected="true"] { color: var(--fg); border-bottom-color: var(--accent); font-weight: 600; }

.panel { background: var(--bg); padding: 14px; }
.panel[hidden] { display: none; }

.controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; font-size: 14px; }
.controls label { color: var(--muted); display: inline-flex; align-items: center; gap: 5px; }
select, input[type="text"] {
  font: inherit; font-size: 14px; padding: 6px 9px; border: 1px solid var(--line);
  border-radius: 6px; background: var(--bg); color: var(--fg);
}
input[type="text"] { flex: 1; min-width: 180px; font-family: var(--mono); font-size: 13px; }

button.btn {
  font: inherit; font-size: 14px; padding: 7px 14px; border-radius: 6px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg); color: var(--fg);
}
button.btn:hover { border-color: var(--accent); color: var(--accent); }
button.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.btn.primary:hover { opacity: .9; color: #fff; }
button.btn:disabled { opacity: .55; cursor: default; }
button.tiny { font-size: 12.5px; padding: 4px 9px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 820px) { .grid2 { grid-template-columns: 1fr; } }

.io { position: relative; }
.io .io-head { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.io .io-head .grow { flex: 1; }

textarea {
  width: 100%; min-height: 240px; resize: vertical; font-family: var(--mono); font-size: 13px;
  line-height: 1.55; padding: 11px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--code-bg); color: var(--fg); tab-size: 2;
}
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

pre.outbox {
  margin: 0; min-height: 240px; max-height: 560px; overflow: auto; padding: 11px;
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px;
  font-family: var(--mono); font-size: 13px; line-height: 1.55; white-space: pre;
}
pre.outbox.err { color: var(--err); border-color: var(--err); }
pre.outbox.ok { color: var(--ok); border-color: var(--ok); }

.drop {
  margin-top: 10px; border: 1.5px dashed var(--line); border-radius: 6px;
  padding: 12px; text-align: center; color: var(--muted); font-size: 13.5px;
}
.drop.over { border-color: var(--accent); color: var(--accent); }

.errbox {
  margin-top: 10px; border-left: 3px solid var(--err); background: var(--panel);
  padding: 10px 12px; border-radius: 0 6px 6px 0; font-size: 14px;
}
.errbox strong { color: var(--err); }
.err-msg { margin-top: 4px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
pre.err-ex {
  margin: 8px 0 0; padding: 8px; background: var(--code-bg); border-radius: 4px;
  font-family: var(--mono); font-size: 12.5px; overflow-x: auto; white-space: pre;
}

.stats { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 10px; font-size: 13px; color: var(--muted); }
.stats b { color: var(--fg); font-weight: 600; }

.note { color: var(--muted); font-size: 13.5px; margin: 10px 0 0; }

/* The feedback link sits next to a failure message, so it stays quiet on
   purpose: a bright button there reads as "we expected this to break". */
.fb {
  display: inline-block; margin-top: 6px; font-size: 12.5px;
  color: var(--muted); text-decoration: underline; text-underline-offset: 2px;
}
.fb:hover { color: var(--accent); }
#stats .fb, .note .fb { margin: 0 0 0 6px; }

.flash {
  margin-left: 8px; font-size: 12.5px; color: var(--ok); background: var(--panel);
  padding: 2px 8px; border-radius: 10px;
}

/* ── Tree view ─────────────────────────────────────────────── */
#tree { max-height: 560px; overflow: auto; font-family: var(--mono); font-size: 13px; line-height: 1.6; }
.tn-kids { padding-left: 18px; border-left: 1px dotted var(--line); margin-left: 5px; }
.tn-head { cursor: pointer; display: block; }
.tn-head:hover .tn-brace { color: var(--accent); }
.tn-head.collapsed .tn-brace::after { content: " …"; color: var(--muted); }
.tn-head.collapsed + .tn-kids { display: none; }
.tn-key-idx { color: var(--muted); }
.tn-key-key { color: var(--accent); }
.tn-val { margin-left: 4px; }
.tn-string { color: var(--ok); }
.tn-number { color: var(--warn); }
.tn-boolean { color: var(--warn); }
.tn-null { color: var(--muted); }
.tn-meta { color: var(--muted); font-size: 12px; margin-left: 6px; }

.try { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 10px 0 0; font-size: 13px; color: var(--muted); }

/* ── Prose ───────────────────────────────────────────── */
.prose { max-width: 760px; margin-top: 40px; }
.prose h2 { border-top: 1px solid var(--line); padding-top: 22px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose code {
  font-family: var(--mono); font-size: 13.5px; background: var(--code-bg);
  padding: 1.5px 5px; border-radius: 4px;
}
.prose pre {
  background: var(--code-bg); padding: 12px; border-radius: 6px; overflow-x: auto;
  font-family: var(--mono); font-size: 13px; line-height: 1.55;
}
.prose table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; }
.prose th { background: var(--panel); font-weight: 600; }

details.faq { border-bottom: 1px solid var(--line); padding: 12px 0; }
details.faq summary { cursor: pointer; font-weight: 600; }
details.faq p { margin: 8px 0 0; color: var(--muted); }

.cta-row { margin: 14px 0 2px; display: flex; flex-wrap: wrap; gap: 10px }
.cta { display: inline-block; padding: 8px 14px; border: 1px solid currentColor;
       border-radius: 6px; text-decoration: none; font-weight: 600 }
.cta:hover { opacity: .82 }
.disclosure {
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  background: var(--panel); padding: 10px 13px; border-radius: 0 6px 6px 0;
  font-size: 13.5px; color: var(--muted); margin: 0 0 20px;
}

.adslot {
  border: 1px dashed var(--line); border-radius: 6px; padding: 14px; text-align: center;
  color: var(--muted); font-size: 12.5px; margin: 22px 0; min-height: 92px;
  display: flex; align-items: center; justify-content: center;
}

footer.site {
  border-top: 1px solid var(--line); margin-top: 46px; padding: 22px 0 40px;
  color: var(--muted); font-size: 13.5px;
}
footer.site a { color: var(--muted); }
footer.site .row { display: flex; flex-wrap: wrap; gap: 8px 18px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 18px 0; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 14px;
  text-decoration: none; color: var(--fg); display: block;
}
.card:hover { border-color: var(--accent); }
.card .t { font-weight: 600; margin-bottom: 4px; }
.card .d { color: var(--muted); font-size: 13.5px; }