:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #111827;
  --muted: #6b7280;
  --muted-2: #9ca3af;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --ok: #10b981;
  --ok-soft: #d1fae5;
  --bad: #ef4444;
  --bad-soft: #fee2e2;
  --warn: #f59e0b;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 1px 3px rgba(0,0,0,.06);
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

header .lead {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  max-width: 60ch;
}

header .meta {
  margin: 0;
  font-size: 12px;
  color: var(--muted-2);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

#health-status::before { content: "·"; margin-right: 8px; color: var(--border-strong); }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ------------------ panel & inputs ------------------ */

.card, .panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel { padding: 18px 20px; }

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 16px;
  flex-wrap: wrap;
}

.panel-head h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hint {
  font-size: 12px;
  color: var(--muted-2);
}

.input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.input-row .num {
  width: 22px;
  flex-shrink: 0;
  text-align: right;
  font-size: 12px;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}

.input-row input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 8px;
  font: inherit;
  transition: border-color .12s, box-shadow .12s;
}

.input-row input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

.input-row input::placeholder {
  color: var(--muted-2);
}

.input-row .remove {
  background: transparent;
  border: none;
  color: var(--muted-2);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  font-size: 18px;
  line-height: 1;
}

.input-row .remove:hover {
  color: var(--bad);
  background: var(--bad-soft);
}

.row-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.flex-spacer { flex: 1; }

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 9px 16px;
  border: 1px solid transparent;
  transition: background .12s, border-color .12s, color .12s;
}

button.primary {
  background: var(--primary);
  color: white;
  font-weight: 500;
}

button.primary:hover { background: var(--primary-hover); }

button.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}

button.ghost:hover {
  background: var(--bg);
  color: var(--text);
}

.status {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  min-height: 20px;
}

.status.error { color: var(--bad); }
.status.loading::after {
  content: "…";
  display: inline-block;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: .3; }
  50% { opacity: 1; }
}

/* ------------------ results ------------------ */

.empty {
  text-align: center;
  padding: 56px 20px;
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
}

.empty.hidden { display: none; }
.empty-icon {
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--muted-2);
}

#groups {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.group {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.group-head {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.group-head .title {
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.group-head .title .pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.group-head .ref {
  font-size: 13px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* match group: green left border + soft green head */
.group.match {
  border-left: 4px solid var(--ok);
}
.group.match .group-head {
  background: var(--ok-soft);
}
.group.match .pill {
  background: var(--ok);
  color: white;
}

/* single product: neutral */
.group.single {
  border-left: 4px solid var(--border-strong);
}
.group.single .pill {
  background: var(--border-strong);
  color: var(--text);
}

/* unmatched: red */
.group.unmatched {
  border-left: 4px solid var(--bad);
}
.group.unmatched .group-head {
  background: var(--bad-soft);
}
.group.unmatched .pill {
  background: var(--bad);
  color: white;
}

.group-body {
  padding: 12px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}

.item-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.item-raw {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  color: var(--text);
  word-break: break-word;
}

.item-raw .idx {
  color: var(--muted-2);
  margin-right: 6px;
}

.item-score {
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.item-score strong {
  color: var(--text);
  font-weight: 600;
}

.fields {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 18px;
  margin-top: 6px;
}

@media (max-width: 640px) {
  .fields { grid-template-columns: 1fr 1fr; }
}

.field .label {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted-2);
  margin-bottom: 1px;
}

.field .value {
  font-size: 13.5px;
  color: var(--text);
  word-break: break-word;
}

.field .value.empty {
  color: var(--muted-2);
  font-style: italic;
}