:root {
  --bg: #f6f6f3;
  --surface: #fcfcfb;
  --surface2: #efeee9;
  --ink: #0b0b0b;
  --text: #1a1a19;
  --muted: #52514e;
  --line: #dddcd5;
  --accent: #2a78d6;
  --accent-ink: #ffffff;
  --good: #0e7a52; --good-bg: #e2f4ec;
  --bad: #b8302f; --bad-bg: #fbe7e6;
  --warn: #8a5a00; --warn-bg: #fdf1d6;
  --neutral-bg: #ecebe6;
  --c-act: #2a78d6; --c-exp: #6b6a66; --c-band: #2a78d6; --c-grid: #e6e5e0; --c-shade: rgba(11,11,11,0.05);
  --shadow: 0 1px 2px rgba(16,24,40,.05), 0 4px 14px rgba(16,24,40,.05);
  --mono: ui-monospace, Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #121211;
  --surface: #1a1a19;
  --surface2: #242422;
  --ink: #ffffff;
  --text: #ecebe6;
  --muted: #c3c2b7;
  --line: #34332f;
  --accent: #3987e5;
  --accent-ink: #0b0b0b;
  --good: #5fd3a3; --good-bg: #13342a;
  --bad: #ff8a87; --bad-bg: #3b1918;
  --warn: #f0c060; --warn-bg: #352a10;
  --neutral-bg: #2a2a27;
  --c-act: #3987e5; --c-exp: #a9a89f; --c-band: #3987e5; --c-grid: #2e2e2b; --c-shade: rgba(255,255,255,0.06);
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.5 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: var(--accent); }
code { font-family: var(--mono); font-size: .92em; background: var(--surface2); padding: 1px 4px; border-radius: 4px; }
.small { font-size: 13px; }
.muted { color: var(--muted); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0; margin: -1px; }
[hidden] { display: none !important; }
.row { display: flex; align-items: center; }
.gap { gap: 10px; }
.wrap { flex-wrap: wrap; }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 20px; border-bottom: 1px solid var(--line); background: var(--surface); position: sticky; top: 0; z-index: 5; }
.brand { display: flex; align-items: center; gap: 8px; min-width: 0; white-space: nowrap; }
.backlink { text-decoration: none; color: var(--muted); }
.backlink:hover { color: var(--text); }
.sep { color: var(--line); }
.topactions { display: flex; align-items: center; gap: 10px; }
.badge { font-size: 12px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; white-space: nowrap; }

button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid transparent; padding: 7px 12px; color: var(--text); background: none; }
button:focus-visible, select:focus-visible, input:focus-visible, .dropzone:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.secondary { background: var(--surface2); border-color: var(--line); }
.secondary:hover { border-color: var(--muted); }
.ghost { border-color: var(--line); }
.ghost:hover { background: var(--surface2); }
.iconbtn { width: 36px; height: 36px; padding: 0; font-size: 18px; line-height: 1; }
.linkbtn { padding: 0; color: var(--accent); text-decoration: underline; font-size: 13px; }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 5px 12px; font-size: 14px; }
.chip:hover { border-color: var(--accent); color: var(--accent); }

main { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; }
.hero { padding: 28px 0 14px; }
.hero h1 { font-size: clamp(26px, 3.6vw, 38px); line-height: 1.15; margin: 0 0 8px; letter-spacing: -.01em; }
.lede { margin: 0 0 14px; color: var(--muted); max-width: 760px; font-size: 16px; }
.examples { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; margin: 16px 0; box-shadow: var(--shadow); min-width: 0; position: relative; }
.card h2 { font-size: 17px; margin: 0 0 10px; }
.cardhead { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.cardhead h2 { margin: 0; }
.num { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-size: 13px; margin-right: 6px; vertical-align: 1px; }
.subh { font-size: 14px; margin: 14px 0 4px; color: var(--muted); font-weight: 600; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 9px; padding: 2px; background: var(--surface2); }
.segbtn { border-radius: 7px; padding: 5px 12px; font-size: 14px; color: var(--muted); }
.segbtn.on { background: var(--surface); color: var(--text); box-shadow: var(--shadow); font-weight: 600; }
.seg.mini .segbtn { padding: 3px 10px; font-size: 13px; }
.segbtn.on.r-test { color: var(--accent); }
.segbtn.on.r-control { color: var(--warn); }

.dropzone { border: 2px dashed var(--line); border-radius: 12px; padding: 24px 16px; text-align: center; display: flex; flex-direction: column; gap: 4px; cursor: pointer; background: var(--surface2); }
.dropzone.small { padding: 16px 12px; }
.dropzone:hover, .dropzone.over { border-color: var(--accent); }
.twofiles { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.lbl { font-size: 13px; font-weight: 600; color: var(--muted); }
.fname { margin-top: 4px; min-height: 1em; overflow-wrap: anywhere; }
details.paste { margin-top: 10px; }
details summary { cursor: pointer; color: var(--muted); font-size: 14px; }
textarea { width: 100%; font: 13px/1.4 var(--mono); padding: 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--text); margin: 8px 0; resize: vertical; }
.msg { min-height: 1.2em; margin: 10px 0 0; font-size: 14px; }
.msg.err { color: var(--bad); } .msg.warn { color: var(--warn); } .msg.ok { color: var(--muted); }
.tiny-links { margin-top: 10px; align-items: flex-start; }
details.fmt ul { margin: 6px 0 0; padding-left: 18px; font-size: 14px; }

.mapping { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 12px; }
.maprow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-bottom: 10px; }
select, input[type="date"], input[type="text"] { font: inherit; font-size: 14px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--text); max-width: 100%; }
.assign { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 12px; align-items: center; max-width: 560px; }
.assignhead { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.cname { overflow-wrap: anywhere; font-size: 14px; }

.settings { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field.inline { flex-direction: row; align-items: center; gap: 8px; margin: 6px 0; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.advanced { grid-column: 1 / -1; }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; margin: 6px 0; }

.verdict .vhead { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.vbadge { font-weight: 700; padding: 4px 12px; border-radius: 999px; font-size: 14px; }
.vbadge.good { color: var(--good); background: var(--good-bg); }
.vbadge.bad { color: var(--bad); background: var(--bad-bg); }
.vbadge.warn { color: var(--warn); background: var(--warn-bg); }
.vbadge.neutral { color: var(--text); background: var(--neutral-bg); }
.vtext { font-size: 18px; line-height: 1.45; margin: 10px 0 14px; max-width: 860px; }
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.tile { background: var(--surface2); border-radius: 10px; padding: 10px 12px; min-width: 0; }
.tlbl { font-size: 12px; color: var(--muted); }
.tval { font-size: 26px; font-weight: 700; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.tsub { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.cautions { margin: 14px 0 0; padding-left: 20px; font-size: 14px; color: var(--warn); }
.cautions li.info { color: var(--muted); }
.exports { margin-top: 14px; }

.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 13px; color: var(--muted); }
.sw { display: inline-block; width: 18px; height: 0; vertical-align: middle; margin-right: 6px; border-top: 2px solid var(--c-act); }
.sw-exp { border-top: 2px dashed var(--c-exp); }
.sw-band { height: 10px; border: none; background: var(--c-band); opacity: .25; border-radius: 2px; }
.chartwrap { width: 100%; min-height: 280px; touch-action: pan-y; }
.chartwrap.short { min-height: 170px; }
.chartwrap svg { display: block; width: 100%; height: auto; }
.tip { position: fixed; z-index: 20; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 8px; padding: 8px 10px; font-size: 13px; pointer-events: none; font-variant-numeric: tabular-nums; }
.tableview { margin-top: 12px; }
.tablescroll { max-height: 360px; overflow: auto; margin-top: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 5px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
table.kv th[scope="row"] { color: var(--text); font-weight: 500; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.okline { color: var(--good); } .warnline { color: var(--warn); }
.how ol { padding-left: 20px; margin: 0 0 8px; }
.how li { margin-bottom: 6px; }
.foot { max-width: 1100px; margin: 0 auto; padding: 16px 20px 32px; display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 13px; }

@media (max-width: 760px) {
  .topbar { padding: 8px 16px; }
  .badge { display: none; }
  main { padding: 0 16px 32px; }
  .card { padding: 14px; }
  .settings, .grid2, .twofiles { grid-template-columns: 1fr; }
  .tiles { grid-template-columns: 1fr 1fr; }
  .tval { font-size: 22px; }
  .vtext { font-size: 16px; }
  .foot { padding: 16px; }
}