/* ============================================================
   Invoice Reconciliation Lab — self-contained styles
   Served from reconciliation.stanleylutka.com via host rewrite,
   so ALL asset paths are relative. Design tokens are inlined here
   (the main site's /assets/* would 404 under this host root).
   "ledger meets terminal" — matches stanleylutka.com.
   ============================================================ */

:root {
  --bg: #f7f5f0;
  --bg-2: #efece4;
  --fg: #16203a;
  --fg-soft: #34405e;
  --muted: #5a6783;
  --card: #fffdf9;
  --card-2: #fbf9f3;
  --border: #e1dccf;
  --border-strong: #cfc8b6;
  --link: #0e7fb8;
  --accent: #0a8ec9;
  --good: #15803d;
  --warn: #b45309;
  --danger: #c0362c;
  --ring: rgba(10, 142, 201, 0.35);
  --grid-line: rgba(22, 32, 58, 0.045);
  --glow: rgba(10, 142, 201, 0.18);
  --shadow-card: 0 1px 0 rgba(255,255,255,0.6) inset, 0 18px 40px -28px rgba(22, 32, 58, 0.45);
  --grad: linear-gradient(120deg, #0a8ec9 0%, #2563eb 52%, #7c3aed 100%);
  --grad-soft: linear-gradient(120deg, rgba(10,142,201,0.16), rgba(124,58,237,0.14));

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Newsreader", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius: 16px;
  --radius-sm: 11px;
}

html[data-theme="dark"] {
  --bg: #0b1020;
  --bg-2: #080c19;
  --fg: #e9edf7;
  --fg-soft: #c4cce0;
  --muted: #8a98b8;
  --card: #11172b;
  --card-2: #0d1426;
  --border: #1e2840;
  --border-strong: #2c3a5c;
  --link: #56c5f5;
  --accent: #38bdf8;
  --good: #4ade80;
  --warn: #fbbf24;
  --danger: #f87171;
  --ring: rgba(56, 189, 248, 0.5);
  --grid-line: rgba(120, 160, 220, 0.06);
  --glow: rgba(56, 189, 248, 0.3);
  --shadow-card: 0 1px 0 rgba(255,255,255,0.03) inset, 0 24px 60px -30px rgba(0,0,0,0.85);
  --grad: linear-gradient(120deg, #38bdf8 0%, #60a5fa 50%, #a78bfa 100%);
  --grad-soft: linear-gradient(120deg, rgba(56,189,248,0.14), rgba(167,139,250,0.12));
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --bg: #0b1020; --bg-2: #080c19; --fg: #e9edf7; --fg-soft: #c4cce0; --muted: #8a98b8;
    --card: #11172b; --card-2: #0d1426; --border: #1e2840; --border-strong: #2c3a5c;
    --link: #56c5f5; --accent: #38bdf8; --good: #4ade80; --warn: #fbbf24; --danger: #f87171;
    --ring: rgba(56,189,248,0.5); --grid-line: rgba(120,160,220,0.06); --glow: rgba(56,189,248,0.3);
    --grad: linear-gradient(120deg, #38bdf8 0%, #60a5fa 50%, #a78bfa 100%);
  }
}

* { box-sizing: border-box; }

html { transition: background-color 0.4s ease, color 0.4s ease; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  font-weight: 380;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 35%, transparent 88%);
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 35%, transparent 88%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -3;
  background:
    radial-gradient(46rem 28rem at 10% -6%, var(--glow), transparent 60%),
    radial-gradient(42rem 28rem at 96% 4%, rgba(124,58,237,0.10), transparent 62%);
  pointer-events: none;
}

img { max-width: 100%; height: auto; }
::selection { background: var(--accent); color: var(--bg); }
a { color: var(--link); text-underline-offset: 2px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 18px clamp(16px, 4vw, 36px) 60px; }

/* ---------- Header ---------- */
.tool-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0 22px;
  position: sticky;
  top: 0;
  z-index: 40;
  background: linear-gradient(var(--bg) 62%, transparent);
  backdrop-filter: blur(2px);
  flex-wrap: wrap;
}
.tool-top .brand-links { display: inline-flex; align-items: center; gap: 8px 16px; flex-wrap: wrap; }
.wordmark {
  display: inline-flex; align-items: baseline; gap: 9px;
  text-decoration: none; color: var(--fg);
  font-family: var(--font-mono); font-size: 14px; letter-spacing: 0.02em;
}
.wordmark .dot { width: 9px; height: 9px; border-radius: 2px; background: var(--grad); box-shadow: 0 0 14px var(--glow); transform: translateY(-1px); }
.wordmark b { font-weight: 700; }
.wordmark .slash { color: var(--muted); }
.tool-top .navlink { font-family: var(--font-mono); font-size: 13px; color: var(--muted); text-decoration: none; }
.tool-top .navlink:hover { color: var(--accent); }

button.theme {
  border: 1px solid var(--border-strong);
  background: var(--card);
  color: var(--fg);
  border-radius: 999px;
  padding: 8px 15px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12.5px;
  white-space: nowrap;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
button.theme:hover { border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring); transform: translateY(-1px); }

/* ---------- Titles ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 560; line-height: 1.14; letter-spacing: -0.012em; margin: 0 0 10px; font-optical-sizing: auto; }
.muted { color: var(--muted); }
.mono, .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 12px;
}
.kicker::before { content: ""; width: 22px; height: 1px; background: var(--accent); box-shadow: 0 0 8px var(--glow); }

.lab-head { padding: 6px 0 8px; }
.lab-head h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.025em; margin: 0 0 12px; }
.lab-head .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lab-head p { color: var(--fg-soft); max-width: 60ch; margin: 0; font-size: clamp(1rem, 2.2vw, 1.18rem); }
.lab-head .meta-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em;
  padding: 4px 10px; border: 1px solid var(--border-strong); border-radius: 999px;
  background: var(--card); color: var(--muted);
}
.pill .led { width: 7px; height: 7px; border-radius: 50%; background: currentColor; box-shadow: 0 0 8px currentColor; }
.pill.live { color: var(--good); border-color: color-mix(in srgb, var(--good) 45%, var(--border)); }

/* ---------- Cards ---------- */
.card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card), var(--card-2));
  padding: clamp(18px, 2.5vw, 26px);
  box-shadow: var(--shadow-card);
  margin: 18px 0;
}
.card h2 { font-size: clamp(1.3rem, 3vw, 1.7rem); }
.card .step {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  letter-spacing: 0.05em; display: block; margin-bottom: 4px;
}

/* ---------- Form ---------- */
label { display: block; margin-bottom: 14px; font-weight: 500; color: var(--fg); }
label.checkbox { display: flex; align-items: center; gap: 9px; font-weight: 450; margin: 12px 0; color: var(--fg-soft); }
label.checkbox input { width: auto; }

input[type="file"], input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 15px;
  margin-top: 6px;
}
input[type="text"], select { font-family: var(--font-mono); font-size: 13.5px; }
input[type="file"] { font-family: var(--font-mono); font-size: 13px; padding: 9px 11px; cursor: pointer; }
input::placeholder { color: var(--muted); }
input:focus-visible, select:focus-visible {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring);
}

.hint { font-size: 13px; color: var(--muted); margin-top: 6px; font-family: var(--font-mono); display: block; }

details { margin-top: 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--card-2); padding: 0 16px; }
details[open] { padding-bottom: 14px; }
details summary {
  cursor: pointer; font-weight: 600; padding: 14px 0; font-family: var(--font-mono);
  font-size: 13.5px; color: var(--fg-soft); list-style: none;
}
details summary::-webkit-details-marker { display: none; }
details summary::before { content: "▸ "; color: var(--accent); }
details[open] summary::before { content: "▾ "; }

fieldset {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 12px 0;
}
legend { padding: 0 8px; color: var(--accent); font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase; }

.mapping-grid { display: grid; gap: 14px; }
@media (min-width: 680px) { .mapping-grid { grid-template-columns: 1fr 1fr; } }

.inline { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* ---------- Buttons ---------- */
button, .btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--border-strong);
  background: var(--card);
  color: var(--fg);
  padding: 11px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
button:hover, .btn:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring); }
button:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring); }

button.primary, .btn.primary {
  border: none; color: #05111f; background: var(--grad); background-size: 160% 160%;
  font-weight: 600; box-shadow: 0 10px 30px -12px var(--glow);
}
button.secondary, .btn.secondary { background: transparent; }
button[disabled] { opacity: 0.6; cursor: wait; transform: none; box-shadow: none; }

/* ---------- Status line ---------- */
#form-status { margin-top: 14px; font-family: var(--font-mono); font-size: 13.5px; font-weight: 500; }
#form-status.error { color: var(--danger); }
#form-status.success { color: var(--good); }

/* ---------- Results ---------- */
.results-head {
  display: flex; gap: 14px; align-items: center;
  justify-content: space-between; flex-wrap: wrap;
}
.result-actions { display: flex; gap: 10px; flex-wrap: wrap; }
#column-info { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); margin: 6px 0 0; }

.summary-grid { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
@media (min-width: 680px) { .summary-grid { grid-template-columns: repeat(4, 1fr); } }

.metric {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  background: var(--card-2);
}
.metric span { display: block; }
.metric .label { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.metric strong { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-size: 26px; font-weight: 700; margin-top: 4px; display: block; color: var(--fg); }
.metric .sub { font-family: var(--font-mono); font-size: 11.5px; margin-top: 4px; color: var(--muted); }

.result-grid { display: grid; gap: 16px; }
@media (min-width: 880px) { .result-grid { grid-template-columns: 1fr 1fr; } }

.result-grid h3, .mismatch-block h3 { font-size: 1.1rem; display: flex; align-items: center; gap: 8px; }

.table-wrap {
  max-height: 340px; overflow: auto;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--card-2);
}
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 11px; border-bottom: 1px solid var(--border); text-align: left; }
td { font-family: var(--font-mono); font-size: 12.5px; color: var(--fg-soft); vertical-align: top; }
td:first-child { color: var(--fg); }
th {
  font-family: var(--font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--muted); position: sticky; top: 0; background: var(--card); z-index: 1;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: color-mix(in srgb, var(--accent) 6%, transparent); }

.mismatch-block { margin-top: 20px; }
.mismatch-block.card { background: transparent; box-shadow: none; }

.hidden { display: none !important; }

/* ---------- Reveal / motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); animation: rin 0.6s cubic-bezier(0.16,1,0.3,1) forwards; animation-delay: var(--d, 0ms); }
  @keyframes rin { to { opacity: 1; transform: none; } }
}

footer.lab-footer {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 14px;
  display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between;
}
footer.lab-footer a { color: var(--muted); text-decoration: none; }
footer.lab-footer a:hover { color: var(--accent); }
footer.lab-footer .mono { font-size: 12.5px; }

:where(a, button, input, select, summary):focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- Result flags & callouts (engine v2: duplicates, sign flips, splits) ---- */
.callout-block {
  margin-top: 18px;
  padding: 14px 18px;
  border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--border));
  border-left: 3px solid var(--warn);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--warn) 7%, var(--card));
  color: var(--fg-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
}
.callout-block strong { color: var(--warn); }

.flag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  border: 1px solid color-mix(in srgb, var(--warn) 50%, var(--border));
  border-radius: 999px;
  color: var(--warn);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  vertical-align: middle;
  white-space: nowrap;
}