/* ============================================================
   Design tokens
   Grounded in the subject: engineering drawings/spec sheets use
   dimension lines, tick marks, and monospace callouts to communicate
   precise measurements. That vocabulary drives the palette, type, and
   the one signature structural device (.dim-rule) below -- deliberately
   not the cream+terracotta or near-black+neon defaults.
   ============================================================ */
:root {
  --bg: #F5F6F7;              /* drafting-paper gray, not cream */
  --surface: #FFFFFF;
  --ink: #1B2430;             /* technical-ink navy-black */
  --ink-muted: #5B6672;
  --border: #D7DBDF;
  --accent: #C98A1D;          /* ochre/amber -- industrial-signage tone */
  --accent-ink: #7A5511;
  --positive: #2F7A67;        /* calibration-stamp green -- savings/best price */
  --danger: #B3402A;

  --font-display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius: 4px;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0 0 0.4em; }
h1 { font-size: 1.9rem; letter-spacing: -0.01em; }
h2 { font-size: 1.2rem; }
code, .mono { font-family: var(--font-mono); }

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- layout shell ---------- */
.topbar {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.wordmark small {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.65rem;
  color: var(--ink-muted);
  margin-left: 6px;
  letter-spacing: 0.02em;
}
.topnav {
  margin-left: auto;
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  align-items: center;
}
.topnav-form { margin: 0; display: inline; }
.link-button {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--accent-ink);
  cursor: pointer;
  text-decoration: none;
}
.link-button:hover { text-decoration: underline; }

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

/* ---------- signature device: dimension rule ----------
   Mirrors an engineering-drawing dimension line: tick, line, tick,
   with a mono label carrying real information (a count, a status),
   never just decoration. */
.dim-rule {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 22px 0 16px;
  color: var(--ink-muted);
}
.dim-rule::before,
.dim-rule::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
  position: relative;
}
.dim-rule .dim-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.dim-tick {
  width: 1px;
  height: 8px;
  background: var(--border);
  display: inline-block;
}

/* ---------- search form ---------- */
.search-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.search-row {
  display: flex;
  gap: 8px;
}
.search-input {
  flex: 1;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: var(--font-body);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}
.search-input::placeholder { color: var(--ink-muted); font-family: var(--font-mono); font-size: 0.85rem; }

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.filters-row select,
.filters-row input {
  padding: 8px 10px;
  font-size: 0.85rem;
  font-family: var(--font-body);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}
.filters-row input[type="number"] { width: 100px; }

.btn {
  padding: 10px 18px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
  border-radius: var(--radius);
  cursor: pointer;
}
.btn:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--bg); }

/* ---------- results table ---------- */
.results-table { width: 100%; border-collapse: collapse; }
.results-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  padding: 8px 10px;
}
.results-table td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.results-table tr:hover td { background: var(--surface); }
.entity-name { font-weight: 600; }
.entity-meta { color: var(--ink-muted); font-size: 0.82rem; }
.price { font-family: var(--font-mono); font-weight: 600; }
.price.best { color: var(--positive); }
.supplier-count { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-muted); }

.empty-state {
  padding: 40px 20px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--ink-muted);
}
.empty-state strong { color: var(--ink); display: block; margin-bottom: 6px; font-family: var(--font-display); }

.error-panel {
  padding: 16px 18px;
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  background: #FBEEEA;
  color: var(--danger);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ---------- entity / comparison page ---------- */
.spec-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 14px 0 6px;
}
.spec-item .spec-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-transform: uppercase;
  display: block;
}
.spec-item .spec-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.listing-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 16px 18px;
  margin-bottom: 12px;
}
.listing-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}
.listing-supplier { font-weight: 600; font-family: var(--font-display); }
.availability {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--ink-muted);
}
.availability.in_stock { color: var(--positive); border-color: var(--positive); }

.tier-list { display: flex; flex-wrap: wrap; gap: 14px; margin: 8px 0; }
.tier { font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-muted); }
.tier b { color: var(--ink); }

.optimizer {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.optimizer input[type="number"] {
  width: 100px;
  padding: 7px 9px;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.optimizer-result {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink);
}
.optimizer-result .savings { color: var(--positive); font-weight: 600; }

.sparkline { vertical-align: middle; flex-shrink: 0; }

@media (max-width: 640px) {
  .search-row { flex-direction: column; }
  .results-table thead { display: none; }
  .results-table, .results-table tbody, .results-table tr, .results-table td { display: block; width: 100%; }
  .results-table tr { border-bottom: 1px solid var(--border); padding: 10px 0; }
  .results-table td { border: none; padding: 4px 0; }
}