:root {
  --primary: #1a56a0;
  --primary-dark: #134080;
  --primary-light: #e8f0fb;
  --secondary: #0e9f6e;
  --secondary-dark: #0a7a55;
  --danger: #c81e1e;
  --warning: #c27803;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --transition: 0.15s ease;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Header ── */
.site-header {
  background: var(--primary);
  color: #fff;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 56px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-logo {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.site-logo span { color: #7dd3fc; }

.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.site-nav a:hover, .site-nav a.active {
  background: rgba(255,255,255,0.15);
  color: #fff;
}

/* ── Page wrapper ── */
.page-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 24px 48px;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2563eb 100%);
  color: #fff;
  border-radius: 12px;
  padding: 32px 40px;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.hero-icon {
  font-size: 56px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.25));
}

.hero h1 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 6px;
}

.hero p {
  font-size: 14px;
  opacity: 0.88;
  max-width: 600px;
  line-height: 1.6;
}

.hero-badges {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.badge {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

/* ── Upload Zone ── */
.upload-zone {
  border: 2px dashed var(--gray-300);
  border-radius: 12px;
  background: #fff;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 28px;
}

.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
}

.upload-zone.has-file {
  border-style: solid;
  border-color: var(--secondary);
  background: #f0fdf8;
  padding: 20px 24px;
}

.upload-icon { font-size: 48px; margin-bottom: 12px; display: block; }

.upload-zone h3 {
  font-size: 16px;
  color: var(--gray-700);
  margin-bottom: 6px;
}

.upload-zone p {
  font-size: 13px;
  color: var(--gray-500);
}

.upload-zone input[type="file"] { display: none; }

.btn-upload {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 8px 20px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-upload:hover { background: var(--primary-dark); }

.file-info {
  display: none;
  align-items: center;
  gap: 12px;
}

.upload-zone.has-file .file-info { display: flex; }
.upload-zone.has-file .upload-placeholder { display: none; }

.file-info-icon { font-size: 36px; }

.file-info-text strong {
  display: block;
  font-size: 15px;
  color: var(--gray-800);
  margin-bottom: 2px;
}

.file-info-text span {
  font-size: 12px;
  color: var(--gray-500);
}

.btn-change-file {
  margin-left: auto;
  padding: 6px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  background: #fff;
  color: var(--gray-600);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-change-file:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ── Main Layout ── */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 1100px) {
  .main-layout { grid-template-columns: 1fr; }
}

/* ── PDF Viewer ── */
.pdf-viewer-panel {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: sticky;
  top: 72px;
}

.panel-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pdf-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--gray-600);
}

.pdf-nav button {
  width: 28px;
  height: 28px;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.pdf-nav button:hover { background: var(--gray-100); border-color: var(--primary); }
.pdf-nav button:disabled { opacity: 0.35; cursor: not-allowed; }

.pdf-canvas-wrapper {
  background: var(--gray-200);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow: auto;
  max-height: 70vh;
}

.pdf-canvas-wrapper canvas {
  box-shadow: var(--shadow-md);
  max-width: 100%;
  height: auto;
}

.pdf-placeholder {
  text-align: center;
  color: var(--gray-400);
}

.pdf-placeholder .ph-icon { font-size: 56px; display: block; margin-bottom: 8px; }
.pdf-placeholder p { font-size: 13px; }

/* ── Form Panel ── */
.form-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
}

.card-header .card-icon {
  font-size: 18px;
}

.card-body {
  padding: 20px;
}

/* ── Form Grid ── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 20px;
}

.form-grid .full-width { grid-column: 1 / -1; }
.form-grid .w-third { grid-column: span 1; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-group label .required {
  color: var(--danger);
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 13px;
  color: var(--gray-800);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,86,160,0.12);
}

.form-group input.error { border-color: var(--danger); }

.form-group input[readonly] {
  background: var(--gray-100);
  color: var(--gray-500);
  cursor: not-allowed;
}

.form-group textarea {
  resize: vertical;
  min-height: 64px;
}

.form-group .hint {
  font-size: 11px;
  color: var(--gray-400);
}

/* ── Line Items ── */
.positions-table-wrapper {
  overflow-x: auto;
}

.positions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.positions-table th {
  background: var(--gray-50);
  padding: 8px 10px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

.positions-table td {
  padding: 6px 6px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.positions-table td input,
.positions-table td select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--gray-200);
  border-radius: 5px;
  font-size: 12px;
  color: var(--gray-800);
  outline: none;
  transition: border-color var(--transition);
  background: #fff;
}

.positions-table td input:focus,
.positions-table td select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(26,86,160,0.1);
}

.positions-table td.td-readonly {
  font-weight: 600;
  color: var(--gray-700);
  text-align: right;
  padding-right: 10px;
}

.positions-table td.td-actions {
  width: 40px;
  text-align: center;
}

.btn-remove-row {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all var(--transition);
  line-height: 1;
}

.btn-remove-row:hover { color: var(--danger); background: #fef2f2; }

.positions-table tfoot td {
  padding: 8px 10px;
  border-top: 2px solid var(--gray-200);
}

.btn-add-row {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px dashed var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 12px;
}

.btn-add-row:hover { background: #dde9f7; border-style: solid; }

/* ── Totals ── */
.totals-box {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 16px 20px;
}

.totals-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
  color: var(--gray-600);
}

.totals-row.total-grand {
  border-top: 2px solid var(--gray-300);
  margin-top: 8px;
  padding-top: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--gray-900);
}

.totals-row .amount {
  font-weight: 600;
  color: var(--gray-800);
  font-variant-numeric: tabular-nums;
}

.totals-row.total-grand .amount { color: var(--primary); }

/* ── Export Section ── */
.export-section {
  background: linear-gradient(135deg, #1e3a5f 0%, var(--primary) 100%);
  color: #fff;
  border-radius: 12px;
  padding: 28px 32px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
}

.export-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.export-section p {
  font-size: 13px;
  opacity: 0.8;
}

.export-section .export-info { flex: 1; min-width: 200px; }

.export-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-export {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 24px;
  border-radius: 10px;
  border: 2px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.12);
  color: #fff;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
  min-width: 140px;
  backdrop-filter: blur(4px);
}

.btn-export:hover {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.6);
  transform: translateY(-1px);
}

.btn-export .export-format {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.btn-export .export-label {
  font-size: 11px;
  opacity: 0.85;
  font-weight: 500;
}

.btn-export.btn-xrechnung { border-color: rgba(125,211,252,0.5); }
.btn-export.btn-zugferd { border-color: rgba(134,239,172,0.5); }

/* ── Verlauf Page ── */
.verlauf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: gap;
  gap: 16px;
}

.verlauf-header h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-800);
}

.verlauf-header p { font-size: 13px; color: var(--gray-500); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary { background: var(--gray-100); color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-secondary:hover { background: var(--gray-200); }

.btn-danger { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.btn-danger:hover { background: #fee2e2; }

.btn-sm { padding: 5px 10px; font-size: 12px; }

.verlauf-empty {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 64px 32px;
  text-align: center;
  color: var(--gray-400);
}

.verlauf-empty .ve-icon { font-size: 64px; display: block; margin-bottom: 16px; }
.verlauf-empty h3 { font-size: 18px; color: var(--gray-600); margin-bottom: 6px; }
.verlauf-empty p { font-size: 13px; }

.verlauf-table-wrapper {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.verlauf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.verlauf-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--gray-500);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.verlauf-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}

.verlauf-table tr:last-child td { border-bottom: none; }
.verlauf-table tr:hover td { background: var(--gray-50); }

.verlauf-table .invoice-nr {
  font-weight: 600;
  color: var(--primary);
}

.verlauf-table .amount-cell {
  font-weight: 600;
  color: var(--gray-800);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.format-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
}

.format-tag.xrechnung { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }
.format-tag.zugferd { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }

.actions-cell { display: flex; gap: 6px; }

/* ── Toast ── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--gray-900);
  color: #fff;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  font-weight: 500;
  min-width: 280px;
  max-width: 400px;
  animation: slideIn 0.2s ease;
}

.toast.success { background: #065f46; border-left: 4px solid var(--secondary); }
.toast.error { background: #7f1d1d; border-left: 4px solid var(--danger); }
.toast.info { background: #1e3a5f; border-left: 4px solid var(--primary); }

.toast-icon { font-size: 18px; flex-shrink: 0; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(20px); }
}

.toast.fade-out { animation: slideOut 0.2s ease forwards; }

/* ── Autofill Banner ── */
.autofill-banner {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: #f0fdf4;
  border: 1px solid #86efac;
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 20px;
}

.autofill-icon { font-size: 22px; flex-shrink: 0; margin-top: 1px; }

.autofill-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 13px;
  color: #166534;
}

.autofill-text strong { font-size: 14px; }
.autofill-text span   { color: #15803d; opacity: 0.9; }

.autofill-close {
  background: none;
  border: none;
  color: #166534;
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.6;
  transition: opacity var(--transition);
  flex-shrink: 0;
}
.autofill-close:hover { opacity: 1; }

/* ── Autofilled field highlight ── */
input.autofilled,
select.autofilled,
textarea.autofilled {
  background: #f0fdf4 !important;
  border-color: #86efac !important;
}

/* positions-table autofilled cells */
.positions-table td input.autofilled { background: #f0fdf4 !important; border-color: #86efac !important; }

/* ── Verlauf Loading ── */
.verlauf-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 64px 32px;
  color: var(--gray-500);
  font-size: 14px;
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.verlauf-loading .spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

/* ── SharePoint Error Banner ── */
.sp-error-banner {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 20px;
}

.sp-error-icon { font-size: 22px; flex-shrink: 0; margin-top: 1px; }

.sp-error-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 13px;
  color: #92400e;
}

.sp-error-text strong { font-size: 14px; color: #78350f; }

.sp-error-close {
  background: none;
  border: none;
  color: #92400e;
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.6;
  transition: opacity var(--transition);
  flex-shrink: 0;
}
.sp-error-close:hover { opacity: 1; }

/* ── Auth Guard ── */
body.auth-guard { visibility: hidden; }

/* ── Auth User Info (Header) ── */
.auth-user {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 8px;
  padding-left: 16px;
  border-left: 1px solid rgba(255,255,255,0.2);
}

.auth-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255,255,255,0.22);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  border: 2px solid rgba(255,255,255,0.4);
  flex-shrink: 0;
  letter-spacing: -0.5px;
}

.auth-user-text { display: flex; flex-direction: column; }

.auth-user-name {
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  line-height: 1.2;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.auth-user-email {
  font-size: 11px;
  color: rgba(255,255,255,0.65);
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-auth-logout {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.28);
  color: rgba(255,255,255,0.85);
  padding: 5px 12px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-auth-logout:hover {
  background: rgba(255,255,255,0.22);
  color: #fff;
}

/* ── Misc ── */
.section-divider {
  height: 1px;
  background: var(--gray-200);
  margin: 4px 0;
}

.text-right { text-align: right; }
.text-center { text-align: center; }
.font-mono { font-family: 'Consolas', monospace; font-size: 12px; }

.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); } }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-box {
  background: #fff;
  border-radius: 12px;
  padding: 32px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.loading-box .spinner {
  width: 40px;
  height: 40px;
  border-width: 4px;
  border-color: var(--gray-200);
  border-top-color: var(--primary);
  display: block;
  margin: 0 auto 16px;
}

.loading-box p {
  font-size: 14px;
  color: var(--gray-600);
  font-weight: 500;
}

/* ── App Footer / Disclaimer ── */
.app-footer {
  background: var(--gray-100);
  border-top: 1px solid var(--gray-200);
  margin-top: 40px;
  padding: 20px 0;
}

.app-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.app-footer-disclaimer {
  font-size: 12px;
  color: var(--gray-500);
  line-height: 1.6;
  margin: 0;
}

.app-footer-disclaimer strong {
  color: var(--gray-600);
}

.app-footer-version {
  font-size: 11px;
  color: var(--gray-400);
  margin: 0;
  letter-spacing: 0.3px;
}