:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel-2: #1f232c;
  --border: #2a2f3a;
  --text: #e8eaed;
  --muted: #9aa3b2;
  --accent: #4f8cff;
  --accent-hover: #6ba0ff;
  --good: #34c759;
  --warn: #ff6b6b;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
code, kbd, .mono { font-family: var(--mono); }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { max-width: 1240px; margin: 0 auto; padding: 0 20px; }

/* header / nav */
.site-header { border-bottom: 1px solid var(--border); background: rgba(15,17,21,0.85); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(8px); }
.site-header .wrap, .site-header .wrap-wide { display: flex; align-items: center; gap: 18px; height: 54px; }
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); }
.brand:hover { text-decoration: none; color: var(--text); }
.brand .dot { color: var(--accent); }
.nav { display: flex; gap: 16px; align-items: center; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--muted); font-size: 0.92rem; }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav .sibling { border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; color: var(--text); }
.nav .sibling:hover { border-color: var(--accent); }

main { padding: 20px 0 64px; }

/* two-column app layout (tool left, docs right) */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.app { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.app .tool { margin: 0; }
.app-docs { position: sticky; top: 74px; align-self: start; max-height: calc(100vh - 96px); overflow-y: auto; padding-right: 4px; }
.app-docs h2 { margin-top: 0; }
.app-docs-hint { color: var(--muted); font-size: 0.82rem; margin: 0 0 8px; }
.app-docs .ref-group:first-of-type { margin-top: 10px; }
.below { margin-top: 40px; }
h1 { font-size: 1.85rem; line-height: 1.25; margin: 0 0 10px; }
h2 { font-size: 1.3rem; margin: 40px 0 14px; }
h3 { font-size: 1.05rem; margin: 26px 0 10px; }
.lede { color: var(--muted); font-size: 1.05rem; margin: 0 0 8px; }
.crumbs { font-size: 0.85rem; color: var(--muted); margin-bottom: 18px; }
.crumbs a { color: var(--muted); }

/* tool */
.tool { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin: 24px 0; }
.io-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.io-row { display: flex; gap: 10px; align-items: stretch; }

/* input group: format box + attached clear button */
.input-group { display: flex; width: 100%; }
.input-group #fmt-input { flex: 1; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.ig-btn { display: flex; align-items: center; justify-content: center; min-width: 44px;
  border: 1px solid var(--border); border-left: none; border-radius: 0 10px 10px 0;
  background: var(--panel-2); color: var(--muted); cursor: pointer; font-size: 1.4rem; line-height: 1; }
.ig-btn:hover { color: var(--text); border-color: var(--accent); }

/* docs row highlighted when you click its directive in the format box */
.ref-table tr.hl td { background: rgba(79,140,255,0.16); }
.ref-table tr.hl .ref-tok button, .ref-table tr.hl .ref-tok a { color: var(--accent-hover); }
#fmt-input {
  flex: 1; font-family: var(--mono); font-size: 1.15rem;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px;
}
#fmt-input:focus { outline: none; border-color: var(--accent); }
#fmt-output {
  font-family: var(--mono); font-size: 1.35rem; color: var(--good);
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px; margin-top: 6px; min-height: 1.6em; word-break: break-all;
}
#now-line { font-size: 0.82rem; color: var(--muted); margin-top: 8px; }

.controls { display: flex; flex-wrap: wrap; gap: 14px; margin: 18px 0 6px; }
.control { display: flex; flex-direction: column; gap: 4px; }
.control label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
select { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 10px; font-size: 0.9rem; }

button.copy, .btn {
  font: inherit; cursor: pointer; border: 1px solid var(--border); background: var(--panel-2);
  color: var(--text); border-radius: 8px; padding: 6px 12px; font-size: 0.82rem;
}
button.copy:hover, .btn:hover { border-color: var(--accent); }

/* breakdown — reads as plain help text, not clickable controls */
.breakdown { margin-top: 16px; }
.bk-head { font-size: 0.72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 0 0 4px; }
.seg { margin: 0; padding: 2px 0; font-size: 0.98rem; line-height: 1.55; color: var(--muted); }
.seg .seg-tok { font-family: var(--mono); font-weight: 700; color: var(--accent); }
.seg.seg-lit .seg-tok { color: var(--muted); font-weight: 400; }
.seg.seg-err .seg-tok { color: var(--warn); }
.seg .seg-desc { color: var(--muted); }
.seg .seg-arrow { color: var(--border); margin: 0 7px; }
.seg .seg-val { font-family: var(--mono); color: var(--text); }
.seg-empty { color: var(--muted); font-size: 0.95rem; }

/* presets / chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 0; }
.chip { font-family: var(--mono); font-size: 0.85rem; background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; cursor: pointer; color: var(--text); }
.chip:hover { border-color: var(--accent); text-decoration: none; }
.chip small { color: var(--muted); font-family: -apple-system, sans-serif; margin-left: 6px; }

/* reference table */
.ref-group { margin-top: 26px; }
.ref-group h3 { margin-bottom: 8px; }
.ref-table { width: 100%; border-collapse: collapse; }
.ref-table td { border-bottom: 1px solid var(--border); padding: 9px 8px; vertical-align: top; }
.ref-tok { width: 78px; }
.ref-tok button, .ref-tok a, .ref-tokname { font-family: var(--mono); font-weight: 700; color: var(--accent);
  background: none; border: none; padding: 0; cursor: pointer; font-size: 0.95rem; }
.ref-row { cursor: pointer; }
.ref-row:hover td { background: rgba(79,140,255,0.09); }
.ref-tok .plat { display: block; font-size: 0.62rem; color: var(--muted); font-weight: 400; }
.ref-desc { color: var(--text); font-size: 0.92rem; }
.ref-ex { font-family: var(--mono); color: var(--good); white-space: nowrap; text-align: right; width: 1%; }

/* generic content cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 16px 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; display: block; }
.card:hover { border-color: var(--accent); text-decoration: none; }
.card .t { display: block; font-family: var(--mono); color: var(--accent); font-weight: 700; }
.card .d { display: block; color: var(--muted); font-size: 0.86rem; margin-top: 4px; }

pre { background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 14px; overflow-x: auto; }
.py-code { margin: 6px 0 0; padding: 12px 14px; }
.py-code code { color: var(--text); }
.py-imp { color: var(--muted); }
pre code { font-size: 0.88rem; line-height: 1.5; color: var(--text); }
.note { background: var(--panel); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; padding: 10px 14px; color: var(--muted); font-size: 0.9rem; margin: 16px 0; }

.faq dt { font-weight: 600; margin-top: 16px; }
.faq dd { margin: 4px 0 0; color: var(--muted); }

/* ad slot (off by default) */
.ad-slot { margin: 28px 0; min-height: 0; }

footer.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; padding: 28px 0 48px; }
footer .cols { display: flex; flex-wrap: wrap; gap: 28px; }
footer a { color: var(--muted); }
footer a:hover { color: var(--text); }
footer .disclaim { margin-top: 18px; font-size: 0.78rem; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .app-docs { position: static; max-height: none; overflow: visible; }
}
@media (max-width: 560px) {
  .io-row { flex-direction: column; }
}