:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --ink: #1a1e26;
  --muted: #5d6573;
  --line: #e2e0d8;
  --field: #8a8f99;
  --accent: #145c54;
  --accent-ink: #ffffff;
  --accent-soft: #e3efec;
  --warn: #8a5a00;
  --warn-soft: #fbf1dc;
  --bad: #a3271f;
  --bad-soft: #fbe6e3;
  --good: #1f6b35;
  --good-soft: #e2f2e6;
  --radius: 10px;
  --mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a;
    --surface: #1a1f26;
    --ink: #e8e9ec;
    --muted: #9aa2ae;
    --line: #2c333d;
    --field: #7d8592;
    --accent: #5cc0b0;
    --accent-ink: #0d1a18;
    --accent-soft: #1b302c;
    --warn: #e7b65c;
    --warn-soft: #2e2617;
    --bad: #f08a80;
    --bad-soft: #3a1f1c;
    --good: #7dd197;
    --good-soft: #1a2e20;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
header.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0; gap: 12px; flex-wrap: wrap;
}
.brand { font-weight: 800; font-size: 22px; letter-spacing: -0.02em; color: var(--accent);
  text-decoration: none; }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }
.hero { padding: 36px 0 20px; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.1; margin: 0 0 14px;
  letter-spacing: -0.025em; }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px;
  margin: 28px 0; padding: 0; list-style: none; counter-reset: step; }
.steps li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; counter-increment: step; }
.steps li::before { content: counter(step); display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%; background: var(--accent-soft);
  color: var(--accent); font-weight: 700; margin-bottom: 8px; }
.steps strong { display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 15px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin: 18px 0; }
.card h2 { margin: 0 0 6px; font-size: 21px; }
.card > p.sub { margin: 0 0 16px; color: var(--muted); }
.note { background: var(--accent-soft); border-radius: var(--radius); padding: 14px 16px;
  font-size: 15px; }
.note ul { margin: 6px 0 0; padding-left: 20px; }
.files { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.drop { border: 1.5px dashed var(--field); border-radius: var(--radius); padding: 14px;
  background: var(--bg); }
.drop label { font-weight: 650; display: block; margin-bottom: 4px; }
.drop .hint { color: var(--muted); font-size: 13.5px; margin: 0 0 8px; }
input[type="file"] { width: 100%; font-size: 14px; }
input[type="text"], input[type="email"], select { width: 100%; padding: 9px 10px; border: 1px solid var(--field);
  border-radius: 8px; background: var(--surface); color: var(--ink); font-size: 15px; }
details { margin: 14px 0; }
summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-top: 16px; }
button, .btn { appearance: none; border: 0; border-radius: 8px; padding: 11px 18px;
  font-weight: 650; font-size: 15px; cursor: pointer; background: var(--accent);
  color: var(--accent-ink); text-decoration: none; display: inline-block; }
button.secondary, .btn.secondary { background: transparent; color: var(--accent);
  border: 1px solid var(--accent); }
button.danger { background: transparent; color: var(--bad); border: 1px solid var(--bad); }
button:disabled { opacity: 0.5; cursor: progress; }
.muted { color: var(--muted); }
.small { font-size: 13.5px; }
.preview { margin-top: 10px; font-size: 13.5px; }
.preview .removed { color: var(--good); font-weight: 600; }
.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px;
  margin-top: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th, td { text-align: left; padding: 6px 9px; border-bottom: 1px solid var(--line);
  white-space: nowrap; }
th { color: var(--muted); font-weight: 600; background: var(--bg); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono); }
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-weight: 700;
  font-size: 13px; }
.badge.good { background: var(--good-soft); color: var(--good); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px;
  margin: 14px 0; }
.stat { background: var(--bg); border-radius: 8px; padding: 10px 12px; }
.stat b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 13px; }
.exception { border-left: 3px solid var(--bad); padding: 4px 0 4px 14px; margin: 18px 0; }
.exception h3 { margin: 0 0 6px; font-size: 16.5px; }
.exception .fix { margin-top: 8px; font-size: 14.5px; }
.warnings { background: var(--warn-soft); color: var(--warn); border-radius: 8px;
  padding: 10px 14px; font-size: 14px; }
.error { background: var(--bad-soft); color: var(--bad); border-radius: 8px; padding: 12px 14px; }
.mapper { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px;
  margin-top: 10px; }
.mapper label { font-size: 13.5px; font-weight: 600; }
.hidden { display: none !important; }
footer { color: var(--muted); font-size: 13.5px; padding: 30px 0 40px; }
.prose h2 { margin-top: 28px; }
.prose li { margin: 4px 0; }

/* ---- in-app help: "?" buttons and side panel ---- */
button.help {
  display: inline-grid; place-items: center; width: 24px; height: 24px; padding: 0;
  margin-left: 6px; border-radius: 50%; border: 1px solid var(--accent);
  background: var(--surface); color: var(--accent); font-size: 13px; font-weight: 700;
  line-height: 1; vertical-align: middle; cursor: pointer; flex: none;
}
button.help:hover, button.help[aria-expanded="true"] {
  background: var(--accent); color: var(--accent-ink);
}
button.help:focus-visible, .help-close:focus-visible, a:focus-visible, button:focus-visible,
input:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent); outline-offset: 2px;
}
.help-panel {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(420px, 100vw); z-index: 50;
  background: var(--surface); color: var(--ink); border-left: 1px solid var(--line);
  box-shadow: -8px 0 24px rgba(0, 0, 0, 0.12); display: flex; flex-direction: column;
}
.help-panel[hidden] { display: none; }
.help-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 18px; border-bottom: 1px solid var(--line);
}
.help-head h2 { margin: 0; font-size: 18px; }
.help-head h2:focus { outline: none; }
.help-close {
  background: transparent; color: var(--accent); border: 1px solid var(--accent);
  padding: 6px 12px; font-size: 14px;
}
.help-body { padding: 14px 18px 24px; overflow-y: auto; font-size: 15px; }
.help-body h3 { font-size: 15px; margin: 16px 0 4px; }
.help-body ul { padding-left: 20px; margin: 6px 0; }
.help-summary { font-size: 16px; }
.help-more { margin-top: 18px; font-size: 14px; }
.help-topic { scroll-margin-top: 16px; padding: 4px 0 8px; }
.help-topic.highlight { background: var(--accent-soft); border-radius: 8px; padding: 6px 10px; }
.labelrow { display: flex; align-items: center; gap: 2px; }
.labelrow label { margin-bottom: 0; }
@media (max-width: 600px) {
  .help-panel { width: 100vw; border-left: 0; }
}