/* TinyPDF · JSON Compare & Schema Validator
   Layout: dark brand bar → narrow hero → full-width tool workspace (two panes side by side)
           → results (summary, diff table, twin code viewers) → reading-width article sections. */
:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --surface-2: #f7f9fb;
  --ink: #16202e;
  --ink-2: #4a5566;
  --muted: #6b7686;
  --line: #dde3ea;
  --line-strong: #c4ccd7;
  --brand: #ffffff;
  --brand-ink: #16202e;
  --accent: #0b6e69;
  --accent-ink: #ffffff;
  --accent-soft: #e2f2f0;
  --focus: #2b7fff;

  --rem-bg: #fde8e8;  --rem-ink: #a11d1d;  --rem-bar: #d93838;
  --add-bg: #e3f5e7;  --add-ink: #146c2e;  --add-bar: #2e9e4f;
  --chg-bg: #fff3d6;  --chg-ink: #8a5a00;  --chg-bar: #e0a100;
  --typ-bg: #efe7fd;  --typ-ink: #5a2fb0;  --typ-bar: #7c4ddb;
  --err-bg: #fde8e8;  --err-ink: #a11d1d;  --err-bar: #d93838;
  --ok-bg: #e3f5e7;   --ok-ink: #146c2e;
  --warn-bg: #fff3d6; --warn-ink: #7a5000;
  --flash: #ffe58a;

  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-display: "IBM Plex Sans Condensed", "IBM Plex Sans", "Arial Narrow", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --radius: 8px;
  --lh-code: 20px;
  color-scheme: light;
}
/* Theme: light is the default (matches tinypdf.in). The header switch sets
   data-theme="dark", or data-theme="auto" to follow the device setting. */
:root[data-theme="dark"] {
  --bg: #0e141c; --surface: #151d28; --surface-2: #1a2330; --ink: #e6ebf2; --ink-2: #b4bfcd; --muted: #8c98a8;
  --line: #283343; --line-strong: #37445a; --brand: #151d28; --brand-ink: #eef2f7;
  --accent: #3cc2b8; --accent-ink: #062422; --accent-soft: #123331; --focus: #6aa8ff;
  --rem-bg: #3a1a1d; --rem-ink: #ffb3b3; --rem-bar: #ef5b5b;
  --add-bg: #15321f; --add-ink: #9fe3b1; --add-bar: #45c46b;
  --chg-bg: #3a2d0d; --chg-ink: #ffd88a; --chg-bar: #f0b429;
  --typ-bg: #2b2045; --typ-ink: #cdb6ff; --typ-bar: #9b74f0;
  --err-bg: #3a1a1d; --err-ink: #ffb3b3; --err-bar: #ef5b5b;
  --ok-bg: #15321f; --ok-ink: #9fe3b1; --warn-bg: #3a2d0d; --warn-ink: #ffd88a; --flash: #5c4b0e;
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
  --bg: #0e141c; --surface: #151d28; --surface-2: #1a2330; --ink: #e6ebf2; --ink-2: #b4bfcd; --muted: #8c98a8;
  --line: #283343; --line-strong: #37445a; --brand: #151d28; --brand-ink: #eef2f7;
  --accent: #3cc2b8; --accent-ink: #062422; --accent-soft: #123331; --focus: #6aa8ff;
  --rem-bg: #3a1a1d; --rem-ink: #ffb3b3; --rem-bar: #ef5b5b;
  --add-bg: #15321f; --add-ink: #9fe3b1; --add-bar: #45c46b;
  --chg-bg: #3a2d0d; --chg-ink: #ffd88a; --chg-bar: #f0b429;
  --typ-bg: #2b2045; --typ-ink: #cdb6ff; --typ-bar: #9b74f0;
  --err-bg: #3a1a1d; --err-ink: #ffb3b3; --err-bar: #ef5b5b;
  --ok-bg: #15321f; --ok-ink: #9fe3b1; --warn-bg: #3a2d0d; --warn-ink: #ffd88a; --flash: #5c4b0e;
  color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 var(--f-body);
}
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
code, kbd { font-family: var(--f-mono); font-size: .9em; }
[hidden] { display: none !important; }

/* ---------- brand bar ---------- */
.topbar { background: var(--brand); color: var(--brand-ink); border-bottom: 1px solid var(--line); box-shadow: 0 1px 3px rgba(22, 32, 46, .05); }
.topbar-in {
  max-width: 1320px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--brand-ink); text-decoration: none; }
.brand img { height: 34px; width: auto; display: block; }
.brand-word { font: 600 20px/1 var(--f-display); letter-spacing: .01em; }
.brand-tag { font-size: 13px; opacity: .72; }
.topnav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.topnav a { color: var(--brand-ink); opacity: .85; text-decoration: none; }
.topnav a:hover { opacity: 1; text-decoration: underline; }
.theme-switch { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 99px; padding: 2px; background: var(--surface-2); }
.theme-switch button { appearance: none; border: 0; background: none; color: var(--ink-2); font-size: 13px; padding: 4px 10px; border-radius: 99px; cursor: pointer; line-height: 1.3; }
.theme-switch button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 0 0 1px var(--line-strong); font-weight: 600; }
.theme-switch button:hover { color: var(--ink); }
.brand img { border-radius: 4px; }
.coffee img { height: 36px; width: auto; display: block; }
.coffee-text { display: inline-block; padding: 6px 12px; border-radius: 6px; background: #ffdd00; color: #1a1a1a !important; opacity: 1 !important; font-weight: 600; }

/* ---------- hero ---------- */
.wrap { max-width: 1320px; margin: 0 auto; padding-inline: 16px; }
.hero { padding-block: 28px 8px; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.crumbs a { color: var(--muted); }
h1 {
  font: 600 clamp(28px, 4.2vw, 40px)/1.1 var(--f-display); margin: 0 0 8px;
  letter-spacing: -.01em; text-wrap: balance;
}
.lede { font-size: 17px; color: var(--ink-2); margin: 0 0 14px; max-width: 70ch; }
.privacy {
  display: flex; gap: 10px; align-items: flex-start; flex-wrap: wrap;
  background: var(--accent-soft); color: var(--ink); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 10px 14px; font-size: 14px; max-width: 900px;
}
.privacy strong { color: var(--accent); }
.engine-badge {
  font: 500 12px/1 var(--f-mono); padding: 4px 8px; border-radius: 99px;
  border: 1px solid var(--line-strong); color: var(--ink-2); white-space: nowrap;
}
.engine-badge.ready { border-color: var(--accent); color: var(--accent); }
.engine-badge.failed { border-color: var(--err-bar); color: var(--err-ink); }

.howto { margin: 18px 0 6px; padding: 0; list-style: none; display: grid; gap: 8px 22px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); counter-reset: step; }
.howto li { counter-increment: step; display: flex; gap: 10px; font-size: 14px; color: var(--ink-2); }
.howto li::before {
  content: counter(step); flex: 0 0 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; font: 600 12px/1 var(--f-mono);
  background: var(--surface); border: 1px solid var(--line-strong); color: var(--ink);
}

/* ---------- tabs ---------- */
.tabs { display: flex; gap: 4px; margin: 22px 0 0; border-bottom: 1px solid var(--line-strong); flex-wrap: wrap; }
.tab {
  appearance: none; border: 1px solid transparent; border-bottom: 0; background: none; cursor: pointer;
  padding: 10px 16px; border-radius: var(--radius) var(--radius) 0 0; font-weight: 600; color: var(--muted);
  margin-bottom: -1px;
}
.tab[aria-selected="true"] { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.tab:hover { color: var(--ink); }
.panel-tab { background: var(--surface); border: 1px solid var(--line-strong); border-top: 0; border-radius: 0 0 var(--radius) var(--radius); padding: 16px; }

/* ---------- editors ---------- */
.pair { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 12px; align-items: stretch; }
.pair.schema { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.swap-col { display: flex; align-items: center; }
.editor { display: flex; flex-direction: column; min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-2); }
.editor.drag { outline: 2px dashed var(--accent); outline-offset: -4px; }
.ed-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.ed-title { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.ed-title b { font: 600 15px/1.2 var(--f-display); letter-spacing: .02em; }
.ed-file { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 220px; }
.ed-tools { display: flex; gap: 6px; flex-wrap: wrap; }
textarea.code {
  display: block; width: 100%; min-height: 300px; height: 340px; resize: vertical; border: 0; margin: 0;
  padding: 10px 12px; background: var(--surface); color: var(--ink);
  font: 13px/1.5 var(--f-mono); tab-size: 2; white-space: pre; overflow: auto;
}
textarea.code:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }
.big-note { padding: 18px 14px; min-height: 120px; background: var(--surface); font-size: 14px; color: var(--ink-2); display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.ed-status { padding: 6px 10px; font-size: 12.5px; border-top: 1px solid var(--line); color: var(--muted); min-height: 32px; display: flex; gap: 6px; align-items: baseline; flex-wrap: wrap; font-variant-numeric: tabular-nums; }
.ed-status.ok { color: var(--ok-ink); }
.ed-status.bad { color: var(--err-ink); background: var(--err-bg); }
.ed-status .jump { background: none; border: 0; padding: 0; color: inherit; text-decoration: underline; cursor: pointer; font-size: inherit; }
.ed-status .snip { display: block; width: 100%; font: 12px/1.4 var(--f-mono); white-space: pre; overflow-x: auto; color: var(--ink); margin-top: 2px; }

.btn {
  appearance: none; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  border-radius: 6px; padding: 5px 10px; font-size: 13px; cursor: pointer; line-height: 1.3; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-2); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink);
  font-weight: 600; font-size: 15px; padding: 10px 22px;
}
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.icon { padding: 8px 10px; font-size: 16px; }

/* ---------- options ---------- */
.options { margin-top: 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-2); }
.options summary { cursor: pointer; padding: 9px 12px; font-weight: 600; font-size: 14px; }
.opt-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px 22px; padding: 4px 12px 14px; }
.opt { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
.opt label.row { display: flex; gap: 8px; align-items: flex-start; cursor: pointer; }
.opt label.row input { margin-top: 4px; }
.opt .hint { font-size: 12.5px; color: var(--muted); }
.opt select, .opt input[type="text"], .opt input[type="number"] {
  border: 1px solid var(--line-strong); background: var(--surface); border-radius: 6px; padding: 6px 8px; font-size: 14px; width: 100%;
}
.action-row { display: flex; gap: 10px; align-items: center; margin-top: 14px; flex-wrap: wrap; }
.action-row .spacer { flex: 1; }
.kbd-hint { font-size: 12.5px; color: var(--muted); }

/* ---------- results ---------- */
.results { margin-top: 18px; display: flex; flex-direction: column; gap: 14px; }
.verdict { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; padding: 14px 16px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface-2); }
.verdict.same { background: var(--ok-bg); border-color: transparent; }
.verdict.diff { background: var(--surface-2); }
.verdict.fail { background: var(--err-bg); border-color: transparent; }
.verdict h2 { margin: 0; font: 600 22px/1.2 var(--f-display); }
.verdict p { margin: 2px 0 0; color: var(--ink-2); font-size: 14px; }
.verdict .v-main { flex: 1 1 320px; min-width: 0; }
.stat-row { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  appearance: none; display: inline-flex; gap: 6px; align-items: baseline; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); border-radius: 99px; padding: 5px 12px; font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.chip b { font: 600 15px/1 var(--f-mono); }
.chip[aria-pressed="true"] { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.chip.k1 b { color: var(--rem-ink); } .chip.k2 b { color: var(--add-ink); }
.chip.k3 b { color: var(--chg-ink); } .chip.k4 b { color: var(--typ-ink); }
.notes { display: flex; flex-direction: column; gap: 6px; font-size: 13.5px; }
.note { padding: 7px 10px; border-radius: 6px; background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-2); }
.note.warn { background: var(--warn-bg); color: var(--warn-ink); border-color: transparent; }
.note.error { background: var(--err-bg); color: var(--err-ink); border-color: transparent; }
.note code { color: inherit; }

.box { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); min-width: 0; }
.box-head { display: flex; gap: 10px; align-items: center; justify-content: space-between; padding: 9px 12px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.box-head h3 { margin: 0; font: 600 16px/1.2 var(--f-display); letter-spacing: .01em; }
.box-tools { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.box-tools input[type="search"] { border: 1px solid var(--line-strong); background: var(--surface); border-radius: 6px; padding: 5px 8px; font-size: 13px; width: 220px; max-width: 100%; }

.table-scroll { overflow: auto; max-height: 420px; }
table.diffs { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 13px; }
table.diffs th { position: sticky; top: 0; background: var(--surface-2); text-align: left; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); padding: 7px 10px; border-bottom: 1px solid var(--line); z-index: 1; }
table.diffs td { padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.diffs tbody tr { cursor: pointer; }
table.diffs tbody tr:hover { background: var(--surface-2); }
table.diffs tbody tr.sel { background: var(--accent-soft); }
td.path { font: 12.5px/1.4 var(--f-mono); word-break: break-all; min-width: 160px; }
td.path .alt { display: block; color: var(--muted); }
td.val { font: 12.5px/1.4 var(--f-mono); word-break: break-word; min-width: 150px; max-width: 360px; }
td.val .t { display: inline-block; white-space: nowrap; font: 600 10.5px/1 var(--f-body); letter-spacing: .04em; text-transform: uppercase; padding: 2px 5px; border-radius: 4px; background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-2); margin-right: 6px; vertical-align: 1px; }
td.val .none { color: var(--muted); font-family: var(--f-body); font-style: italic; }
.pill { display: inline-block; font: 600 11px/1 var(--f-body); letter-spacing: .03em; padding: 4px 7px; border-radius: 4px; white-space: nowrap; }
.pill.k1 { background: var(--rem-bg); color: var(--rem-ink); }
.pill.k2 { background: var(--add-bg); color: var(--add-ink); }
.pill.k3 { background: var(--chg-bg); color: var(--chg-ink); }
.pill.k4 { background: var(--typ-bg); color: var(--typ-ink); }
.pill.k5 { background: var(--err-bg); color: var(--err-ink); }
.pill.ok { background: var(--ok-bg); color: var(--ok-ink); }
.more-row td { text-align: center; }
.empty-row td { text-align: center; color: var(--muted); padding: 18px; }

/* ---------- code viewers ---------- */
.viewers { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; }
.viewer { display: flex; flex-direction: column; min-width: 0; }
.v-body { display: flex; min-width: 0; }
.v-scroll { position: relative; flex: 1; min-width: 0; height: 520px; overflow: auto; background: var(--surface); font: 12.5px/var(--lh-code) var(--f-mono); }
.v-spacer { position: relative; min-width: 100%; }
.v-rows { position: absolute; left: 0; top: 0; min-width: 100%; }
.ln { display: flex; height: var(--lh-code); white-space: pre; }
.ln .no { position: sticky; left: 0; flex: 0 0 auto; min-width: 4.5em; padding: 0 8px 0 4px; text-align: right; color: var(--muted); background: var(--surface-2); border-right: 3px solid transparent; user-select: none; }
.ln .tx { padding: 0 12px 0 8px; }
.ln.m1 { background: var(--rem-bg); } .ln.m1 .no { border-right-color: var(--rem-bar); background: var(--rem-bg); }
.ln.m2 { background: var(--add-bg); } .ln.m2 .no { border-right-color: var(--add-bar); background: var(--add-bg); }
.ln.m3 { background: var(--chg-bg); } .ln.m3 .no { border-right-color: var(--chg-bar); background: var(--chg-bg); }
.ln.m4 { background: var(--typ-bg); } .ln.m4 .no { border-right-color: var(--typ-bar); background: var(--typ-bg); }
.ln.m5 { background: var(--err-bg); } .ln.m5 .no { border-right-color: var(--err-bar); background: var(--err-bg); }
.ln.flash, .ln.flash .no { background: var(--flash) !important; }
.v-map { flex: 0 0 14px; width: 14px; height: 520px; background: var(--surface-2); border-left: 1px solid var(--line); cursor: pointer; display: block; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink-2); }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }
.legend .l1::before { background: var(--rem-bar); } .legend .l2::before { background: var(--add-bar); }
.legend .l3::before { background: var(--chg-bar); } .legend .l4::before { background: var(--typ-bar); }

/* ---------- schema results ---------- */
.doc-list { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 10px; border-top: 1px solid var(--line); background: var(--surface); }
.doc-chip { display: inline-flex; gap: 6px; align-items: center; font-size: 12.5px; padding: 3px 4px 3px 9px; border-radius: 99px; border: 1px solid var(--line-strong); background: var(--surface-2); max-width: 100%; }
.doc-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 220px; }
.doc-chip button { border: 0; background: none; cursor: pointer; color: var(--muted); padding: 0 5px; font-size: 14px; line-height: 1; }
.doc-card .box-head { cursor: default; }
.doc-card .doc-name { font: 600 15px/1.2 var(--f-display); overflow-wrap: anywhere; }
.doc-card .doc-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; }
.doc-card .doc-body > * { min-width: 0; }
.doc-card .doc-errors { border-right: 1px solid var(--line); }
.doc-card .doc-errors .table-scroll { max-height: 520px; }
.doc-card .doc-errors table.diffs { min-width: 460px; }
.doc-card .viewer .v-scroll, .doc-card .viewer .v-map { height: 520px; }
.sp { display: block; color: var(--muted); font: 11.5px/1.4 var(--f-mono); word-break: break-all; }

/* ---------- article ---------- */
.article { max-width: 820px; margin: 40px auto 0; padding-inline: 16px; }
.article h2 { font: 600 24px/1.25 var(--f-display); margin: 34px 0 10px; text-wrap: balance; }
.article h3 { font: 600 17px/1.3 var(--f-display); margin: 20px 0 6px; }
.article p, .article li { color: var(--ink-2); max-width: 70ch; }
.article ul { padding-left: 20px; }
.compare-ex { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; margin: 12px 0; }
.compare-ex pre { margin: 0; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); font: 12.5px/1.5 var(--f-mono); overflow-x: auto; }
.compare-ex figcaption { font-size: 12px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .05em; }
.kw-table-wrap { overflow-x: auto; }
.kw-table { border-collapse: collapse; font-size: 13.5px; width: 100%; }
.kw-table th, .kw-table td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.kw-table th { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.kw-table td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }
.kw-table code { color: var(--ink); }
details.faq { border-bottom: 1px solid var(--line); padding: 10px 0; }
details.faq summary { cursor: pointer; font-weight: 600; color: var(--ink); }
details.faq p { margin: 8px 0 0; }

.related { max-width: 1320px; margin: 40px auto 0; padding-inline: 16px; }
.related h2 { font: 600 20px/1.2 var(--f-display); margin: 0 0 10px; }
.rel-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.rel-card { display: block; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); }
.rel-card:hover { border-color: var(--accent); }
.rel-card b { display: block; font: 600 15px/1.3 var(--f-display); margin-bottom: 3px; }
.rel-card span { font-size: 13px; color: var(--ink-2); }

footer.site { margin-top: 48px; background: var(--brand); color: var(--ink-2); border-top: 1px solid var(--line); }
footer.site .wrap { padding-block: 22px; display: flex; gap: 12px; justify-content: space-between; align-items: center; flex-wrap: wrap; font-size: 14px; }
footer.site a { color: var(--accent); }

.toast {
  position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 9px 16px; border-radius: 8px; font-size: 14px; z-index: 50;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .2); max-width: calc(100% - 32px);
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

/* ---------- narrow screens ---------- */
@media (max-width: 900px) {
  .pair, .pair.schema { grid-template-columns: minmax(0, 1fr); }
  .swap-col { justify-content: center; }
  .swap-col .btn { transform: rotate(90deg); }
  .viewers { grid-template-columns: minmax(0, 1fr); }
  .v-scroll, .v-map { height: 380px; }
  .doc-card .doc-body { grid-template-columns: minmax(0, 1fr); }
  .doc-card .doc-errors { border-right: 0; border-bottom: 1px solid var(--line); }
  .compare-ex { grid-template-columns: minmax(0, 1fr); }
  textarea.code { height: 240px; min-height: 180px; }
  .panel-tab { padding: 12px; }
}