/* ── Variables ──────────────────────────────────────────────────────────────── */
:root {
  --blue:   #1d4ed8;
  --lblue:  #eff6ff;
  --green:  #16a34a;
  --lgreen: #f0fdf4;
  --red:    #dc2626;
  --lred:   #fef2f2;
  --amber:  #d97706;
  --lamber: #fffbeb;
  --gray:   #6b7280;
  --lgray:  #f9fafb;
  --border: #e5e7eb;
  --text:   #111827;
  --radius: 10px;
}

/* ── Reset & Base ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #f3f4f6;
  color: var(--text);
  font-size: 14px;
}

/* ── Header ─────────────────────────────────────────────────────────────────── */
header {
  background: var(--blue);
  color: #fff;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
header h1 { font-size: 1.25rem; font-weight: 700; }
header p  { font-size: .78rem; opacity: .8; }

/* ── Layout ─────────────────────────────────────────────────────────────────── */
main { max-width: 1500px; margin: 0 auto; padding: 20px 16px; }

.card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 18px 22px;
  margin-bottom: 16px;
}

/* ── Upload Grid ─────────────────────────────────────────────────────────────── */
.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 800px) { .upload-grid { grid-template-columns: 1fr; } }

.upload-col h3 {
  font-size: .85rem;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Drop Zone ───────────────────────────────────────────────────────────────── */
.drop-zone {
  border: 2px dashed #d1d5db;
  border-radius: 8px;
  padding: 22px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.drop-zone:hover,
.drop-zone.drag-over { border-color: var(--blue); background: var(--lblue); }
.drop-zone.has-file  { border-color: var(--green); background: var(--lgreen); }
.drop-zone input[type=file] { display: none; }
.drop-zone .dz-icon  { font-size: 1.8rem; margin-bottom: 6px; }
.drop-zone .dz-title { font-size: .85rem; font-weight: 600; }
.drop-zone .dz-sub   { font-size: .75rem; color: var(--gray); margin-top: 2px; }
.drop-zone .dz-fname { margin-top: 8px; font-size: .78rem; font-weight: 600; color: var(--green); }

/* ── Loading Bar ─────────────────────────────────────────────────────────────── */
.loading-bar {
  display: none;
  height: 3px;
  background: linear-gradient(90deg, var(--blue) 0%, #60a5fa 50%, var(--blue) 100%);
  background-size: 200%;
  animation: shimmer 1.2s infinite;
  border-radius: 2px;
  margin-top: 8px;
}
@keyframes shimmer {
  0%   { background-position: 200%; }
  100% { background-position: -200%; }
}

/* ── Preview Table ───────────────────────────────────────────────────────────── */
.preview-section { margin-top: 12px; }
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.preview-header .preview-label { font-size: .8rem; font-weight: 600; color: var(--gray); }
.preview-header .preview-count {
  font-size: .78rem;
  background: var(--lblue);
  color: var(--blue);
  padding: 2px 8px;
  border-radius: 12px;
}

.preview-wrap {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.preview-wrap table       { width: 100%; border-collapse: collapse; font-size: .75rem; }
.preview-wrap th          { background: var(--lgray); font-weight: 600; padding: 6px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; position: sticky; top: 0; z-index: 1; }
.preview-wrap td          { padding: 5px 8px; border-bottom: 1px solid #f3f4f6; vertical-align: top; }
.preview-wrap tr:last-child td { border-bottom: none; }
.preview-wrap tr:hover td { background: #fafafa; }
.preview-empty            { text-align: center; padding: 20px; color: var(--gray); font-size: .8rem; }

/* ── Utility ─────────────────────────────────────────────────────────────────── */
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

.pill      { display: inline-block; padding: 1px 6px; border-radius: 10px; font-size: .68rem; font-weight: 600; }
.pill-in   { background: #dcfce7; color: #15803d; }
.pill-out  { background: #fee2e2; color: #b91c1c; }
.pill-ok   { background: #d1fae5; color: #059669; }
.pill-diff { background: var(--lamber); color: var(--amber); }

/* ── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  border: none;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn:active { transform: scale(.97); }
.btn-primary          { background: var(--blue); color: #fff; }
.btn-primary:hover    { opacity: .9; }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; }
.btn-outline          { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover    { background: var(--lgray); }

.action-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  margin-top: 14px;
}

.spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Alert ───────────────────────────────────────────────────────────────────── */
.alert      { padding: 10px 14px; border-radius: 8px; font-size: .83rem; display: none; margin-top: 12px; }
.alert-err  { background: var(--lred);  color: var(--red);  border: 1px solid #fecaca; display: block; }
.alert-info { background: var(--lblue); color: var(--blue); border: 1px solid #bfdbfe; display: block; }

/* ── Summary Cards ───────────────────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}
.stat-card          { border-radius: 8px; padding: 14px 16px; }
.stat-card .s-label { font-size: .7rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; }
.stat-card .s-val   { font-size: 1.4rem; font-weight: 700; }
.stat-card .s-sub   { font-size: .72rem; margin-top: 2px; }
.card-matched { background: var(--lgreen); color: var(--green); border: 1px solid #bbf7d0; }
.card-gl      { background: var(--lamber); color: var(--amber); border: 1px solid #fde68a; }
.card-bs      { background: var(--lred);   color: var(--red);   border: 1px solid #fecaca; }
.card-total   { background: var(--lblue);  color: var(--blue);  border: 1px solid #bfdbfe; }

/* ── Tabs ────────────────────────────────────────────────────────────────────── */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 14px; }
.tab {
  padding: 7px 16px;
  border: none;
  background: none;
  font-size: .83rem;
  font-weight: 600;
  color: var(--gray);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}
.tab.active             { color: var(--blue); border-bottom-color: var(--blue); }
.tab-badge              { background: var(--border); border-radius: 12px; padding: 1px 6px; font-size: .68rem; margin-left: 3px; }
.tab.active .tab-badge  { background: var(--lblue); color: var(--blue); }
.tab-panel              { display: none; }
.tab-panel.active       { display: block; }

/* ── Result Tables ───────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table.main-tbl           { width: 100%; border-collapse: collapse; font-size: .78rem; }
table.main-tbl th        { background: var(--lgray); font-weight: 600; text-align: left; padding: 7px 9px; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.main-tbl td        { padding: 6px 9px; border-bottom: 1px solid #f3f4f6; vertical-align: top; }
table.main-tbl tr:hover td { background: #fafafa; }

.empty-state     { text-align: center; padding: 36px 20px; color: var(--gray); font-size: .85rem; }
.empty-state .ei { font-size: 2rem; margin-bottom: 6px; }

/* ── Results Section ─────────────────────────────────────────────────────────── */
#results { display: none; }