:root {
  --bg: #f6f7f9; --card: #fff; --ink: #1f2430; --muted: #6b7280; --line: #e4e7ec;
  --primary: #2f6bd8; --primary-ink: #fff; --ok: #137a3f; --err: #b42318; --warn: #8a5a00;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
header, main, footer { max-width: 900px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; }
h1 { margin: 0 0 4px; font-size: 26px; }
h2 { font-size: 18px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 24px 0 8px; }
.sub { color: var(--muted); margin: 0 0 8px; max-width: 640px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 18px 0; box-shadow: 0 1px 2px rgba(16,24,40,.04);
}
.hint { color: var(--muted); font-size: 13px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; word-break: break-all; }
code { background: #eef1f5; padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }

.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
button, .filebtn {
  font: inherit; border-radius: 8px; padding: 9px 16px; cursor: pointer; border: 1px solid var(--line);
  background: #fff; color: var(--ink);
}
button:hover, .filebtn:hover { border-color: #c9ced6; }
.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); font-weight: 600; }
.primary:hover { background: #2559bd; }
.primary:disabled { background: #aebfdd; border-color: #aebfdd; cursor: not-allowed; }
.ghost { background: #fff; }
.filebtn { display: inline-block; }

.cardhead { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.cardhead h2 { margin: 0 0 12px; }
.modes { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; margin-bottom: 12px; }
button.mode { border: none; border-radius: 0; padding: 7px 16px; background: transparent; color: var(--muted); font-size: 13.5px; }
button.mode + button.mode { border-left: 1px solid var(--line); }
button.mode.on { background: var(--primary); color: var(--primary-ink); font-weight: 600; }
button.small, .filebtn.small { padding: 6px 12px; font-size: 13px; }
table.grid.narrow { width: auto; min-width: 320px; }
table.grid.narrow input { width: 74px; font: inherit; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); text-align: center; }

.params { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px; }
.params label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.params input, select { font: inherit; color: var(--ink); padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }

.status { margin-top: 12px; font-size: 13.5px; padding: 8px 10px; border-radius: 8px; background: #f1f3f6; }
.status.ok { background: #e7f4ec; color: var(--ok); }
.status.error { background: #fbeceb; color: var(--err); }
.status.warn { background: #fdf4e3; color: var(--warn); }

.progbar { height: 10px; background: #eceef2; border-radius: 6px; overflow: hidden; margin: 14px 0 6px; }
#progBar { height: 100%; width: 0; background: var(--primary); transition: width .15s; }

.summary { display: flex; flex-wrap: wrap; gap: 10px; margin: 4px 0 10px; }
.stat { background: #f4f7fc; border: 1px solid #e3ebf7; border-radius: 8px; padding: 10px 14px; font-size: 12px; color: var(--muted); text-align: center; min-width: 110px; }
.stat span { display: block; font-size: 20px; font-weight: 700; color: var(--ink); }

.dlrow { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0 4px; }

table.grid { border-collapse: collapse; width: 100%; margin-top: 6px; font-size: 14px; }
table.grid th, table.grid td { border: 1px solid var(--line); padding: 6px 10px; text-align: center; }
table.grid th { background: #f4f6f9; font-weight: 600; }
table.grid tr.throw td { color: var(--muted); background: #fafafa; }

.tablewrap { max-height: 340px; overflow: auto; border: 1px solid var(--line); border-radius: 8px; }
.tablewrap table.grid { border: none; margin: 0; }
.tablewrap table.grid th { position: sticky; top: 0; z-index: 1; }
td.warnpair { font-weight: 700; color: var(--err); }
td.okpair { color: var(--muted); }

.heatwrap { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
canvas { max-width: 100%; image-rendering: pixelated; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
canvas.legend { border: none; }
.hists { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; }
.hists canvas { width: 100%; }

footer { padding: 10px 20px 40px; }

/* --- help page ----------------------------------------------------------- */
body.help main { padding-bottom: 20px; }
.toc ol { margin: 8px 0 0; padding-left: 22px; }
.toc li { margin: 3px 0; }
.toc a, .help a { color: var(--primary); }
pre {
  background: #f4f6f9; border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 14px; overflow-x: auto; font-size: 12.5px; line-height: 1.5;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; margin: 10px 0;
}
pre.flow { background: transparent; border: none; color: var(--muted); padding-left: 0; }
body.help h3 { margin-top: 22px; }
body.help p, body.help li { max-width: 78ch; }
body.help ul { padding-left: 20px; }
body.help li { margin: 5px 0; }
body.help table.grid { margin: 12px 0; }
body.help table.grid td { text-align: left; vertical-align: top; }
body.help table.grid th { text-align: left; }
kbd { background: #eef1f5; border: 1px solid var(--line); border-bottom-width: 2px;
      border-radius: 5px; padding: 1px 5px; font-size: 12px;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.helplink { text-decoration: none; }

@media (prefers-color-scheme: dark) {
  pre { background: #171a20; }
  kbd { background: #2a2f38; }
}

@media (prefers-color-scheme: dark) {
  :root { --bg: #14161a; --card: #1c1f26; --ink: #e6e8ec; --muted: #9aa1ac; --line: #2c313b; --primary: #4a86f0; }
  code { background: #2a2f38; } .status { background: #23272f; }
  .stat { background: #222735; border-color: #2d3546; } .params input, select { background: #171a20; }
  table.grid.narrow input { background: #171a20; color: var(--ink); }
  table.grid th { background: #232833; } table.grid tr.throw td { background: #1a1d24; }
  canvas { background: #fff; }
}