:root {
  --primary: #1a56db;
  --primary-light: #e8effc;
  --primary-dark: #12399a;
  --success: #059669;
  --success-bg: #d1fae5;
  --error: #dc2626;
  --error-bg: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.04);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo-mark {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 0.75rem;
}

header h1 {
  color: var(--gray-900);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header .subtitle {
  color: var(--gray-400);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--gray-500);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  transition: color 0.15s;
}

.back-link:hover { color: var(--primary); }

/* Main */
main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  flex: 1;
}

/* Upload */
.upload-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 2.5rem 1.5rem;
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--gray-50);
  text-align: center;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.btn-browse {
  display: inline-block;
  padding: 0.6rem 2rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-browse:hover { background: var(--primary-dark); }

.dropzone-text {
  font-size: 0.9rem;
  color: var(--gray-400);
}

.file-selected {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  border: 2px solid var(--success);
  border-radius: var(--radius);
  background: var(--success-bg);
}

.file-selected-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  font-family: monospace;
  word-break: break-all;
}

.file-selected-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: var(--gray-200);
  color: var(--gray-700);
  font-size: 1.1rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s;
}
.file-selected-remove:hover { background: var(--gray-300); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--gray-100);
  color: var(--gray-600);
  border-color: var(--gray-200);
  border-radius: 6px;
}
.btn-sm:hover, .btn-sm.active {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  text-align: center;
}

.feature-icon {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.feature-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 0.15rem;
}

.feature-card p {
  font-size: 0.78rem;
  color: var(--gray-400);
}

/* Alert */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.alert-error {
  background: var(--error-bg);
  color: var(--error);
}

/* Summary */
.summary-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.summary-card.success { border-left: 5px solid var(--success); }
.summary-card.error { border-left: 5px solid var(--error); }

.summary-icon {
  font-size: 2.5rem;
  line-height: 1;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}
.summary-card.success .summary-icon { color: var(--success); background: var(--success-bg); }
.summary-card.error .summary-icon { color: var(--error); background: var(--error-bg); }

.summary-content h2 {
  font-size: 1.25rem;
  margin-bottom: 0.15rem;
}

.summary-file {
  color: var(--gray-500);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  font-family: monospace;
}

.stats { display: flex; gap: 2rem; }

.stat { text-align: center; }

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}
.stat-value.stat-error { color: var(--error); }
.stat-value.stat-success { color: var(--success); }

.file-tag {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  margin-left: 0.5rem;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  vertical-align: middle;
}
.file-tag-retorno { background: #ede9fe; color: #6d28d9; }
.file-tag-remessa { background: var(--primary-light); color: var(--primary); }

.stat-label {
  font-size: 0.75rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 0.25rem;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--gray-500);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.tab:hover { color: var(--gray-800); }
.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  padding: 0.1rem 0.45rem;
  background: var(--gray-100);
  color: var(--gray-600);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
}
.tab.active .tab-count {
  background: var(--primary-light);
  color: var(--primary);
}

.tab-panel { display: none; flex-direction: column; gap: 1rem; }
.tab-panel.active { display: flex; }

/* Payment cards */
.payments-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.payment-card {
  background: #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  overflow: hidden;
  border-left: 3px solid var(--primary);
}
.payment-card.payment-pix { border-left-color: #8b5cf6; }
.payment-card.payment-boleto { border-left-color: #f59e0b; }
.payment-card.payment-concessionaria { border-left-color: #0ea5e9; }
.payment-card.payment-tributo { border-left-color: #64748b; }

.payment-card.return-sucesso { border-left-color: var(--success); }
.payment-card.return-rejeitado { border-left-color: var(--error); }
.payment-card.return-pendente { border-left-color: var(--gray-400); }

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.status-sucesso { background: var(--success-bg); color: var(--success); }
.status-rejeitado { background: var(--error-bg); color: var(--error); }
.status-pendente { background: var(--gray-100); color: var(--gray-500); }

.return-occurrences {
  border-top: 1px solid var(--gray-200);
  padding: 0.875rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--gray-50);
}

.return-source-tag {
  align-self: flex-start;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  background: #fef3c7;
  color: #92400e;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.return-occurrence {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.85rem;
  line-height: 1.4;
}

.return-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-width: 36px;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: #fff;
  border: 1px solid var(--gray-300);
  color: var(--gray-800);
  font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.return-description {
  color: var(--gray-700);
  word-break: break-word;
}

.payment-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-100);
}

.payment-index {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--gray-400);
  font-family: monospace;
  min-width: 32px;
}

.payment-kind {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-800);
}

.payment-meta {
  font-size: 0.72rem;
  color: var(--gray-400);
  font-family: monospace;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.payment-fields {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 1.5rem;
  padding: 1rem;
}

.payment-field {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.payment-field dt {
  font-size: 0.72rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.payment-field dd {
  font-size: 0.9rem;
  color: var(--gray-900);
  font-weight: 500;
  word-break: break-word;
}

/* Results toolbar */
.results-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.results-toolbar h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-700);
}

.toolbar-actions { display: flex; gap: 0.5rem; }

/* Records */
.results-list { display: flex; flex-direction: column; gap: 0.5rem; }

.record-detail {
  background: #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  overflow: hidden;
  border-left: 3px solid transparent;
}
.record-detail.detail-error { border-left-color: var(--error); }
.record-detail.detail-success { border-left-color: var(--success); }

.record-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s;
}
.record-header:hover { background: var(--gray-50); }

.record-line {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--gray-400);
  font-family: monospace;
  min-width: 48px;
}

.record-type {
  flex: 1;
  font-size: 0.85rem;
  color: var(--gray-700);
  font-weight: 500;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
}
.badge-error { background: var(--error-bg); color: var(--error); }
.badge-success { background: var(--success-bg); color: var(--success); }

.toggle-icon {
  color: var(--gray-400);
  transition: transform 0.2s;
  display: flex;
}

.record-errors {
  background: var(--error-bg);
  padding: 0.5rem 1rem;
  border-top: 1px solid #fecaca;
}

.error-item {
  color: var(--error);
  font-size: 0.82rem;
  padding: 0.15rem 0;
  padding-left: 0.75rem;
  position: relative;
}
.error-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--error);
  transform: translateY(-50%);
}

.record-fields { border-top: 1px solid var(--gray-100); }

.record-fields table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.record-fields thead th {
  position: sticky;
  top: 0;
  background: var(--gray-50);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-400);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.record-fields tbody td {
  padding: 0.35rem 0.75rem;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: top;
}

.row-blank { opacity: 0.35; }

.field-name {
  color: var(--gray-700);
  font-weight: 500;
  max-width: 200px;
}

.field-pos, .field-len {
  color: var(--gray-400);
  font-family: monospace;
  text-align: center;
  width: 45px;
}

.text-zero {
  color: var(--gray-400);
  font-style: italic;
}

/* Footer */
footer {
  text-align: center;
  margin-top: auto;
  padding-top: 2.5rem;
  padding-bottom: 0.5rem;
}

footer p {
  color: var(--gray-400);
  font-size: 0.8rem;
}

footer a {
  color: var(--gray-500);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s;
}

footer a:hover { color: var(--primary); }

/* Responsive */
@media (max-width: 640px) {
  .container { padding: 1.5rem 1rem 1rem; }

  header h1 { font-size: 1.5rem; }

  .features { grid-template-columns: 1fr; }

  .summary-card {
    flex-direction: column;
    text-align: center;
  }

  .stats { justify-content: center; }

  .record-header { gap: 0.5rem; padding: 0.6rem 0.75rem; }

  .results-toolbar { flex-direction: column; gap: 0.75rem; align-items: flex-start; }

  .payment-fields { grid-template-columns: 1fr; gap: 0.75rem; }

  .tab { padding: 0.6rem 0.85rem; font-size: 0.82rem; }
}