/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --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;
  --sidebar-width: 240px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
}
html { font-size: 14px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-800);
  background: var(--gray-100);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

/* ========== Login Page ========== */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 20px;
}
.login-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,.15);
}
.login-logo {
  text-align: center;
  margin-bottom: 32px;
}
.login-logo .icon { font-size: 48px; }
.login-logo h1 { font-size: 24px; color: var(--gray-800); margin-top: 8px; }
.login-logo p { color: var(--gray-500); font-size: 14px; margin-top: 4px; }

/* ========== Forms ========== */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.form-group label .required { color: var(--danger); }
.form-control {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--gray-800);
  transition: border-color .2s, box-shadow .2s;
  background: #fff;
}
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 80px; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  transition: all .2s;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { filter: brightness(1.1); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(1.1); }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { filter: brightness(1.1); }
.btn-outline {
  background: #fff;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
}
.btn-outline:hover { background: var(--gray-50); border-color: var(--gray-400); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 16px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ========== Layout ========== */
.app-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-width);
  background: var(--gray-900);
  color: var(--gray-300);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform .3s;
}
.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--gray-700);
  display: flex;
  align-items: center;
  gap: 10px;
}
.sidebar-header .icon { font-size: 28px; }
.sidebar-header h2 { font-size: 16px; color: #fff; }
.sidebar-header p { font-size: 11px; color: var(--gray-400); }
.sidebar-nav { flex: 1; padding: 12px 8px; overflow-y: auto; }
.sidebar-nav .nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--gray-300);
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
  margin-bottom: 2px;
}
.sidebar-nav .nav-item:hover { background: var(--gray-800); color: #fff; }
.sidebar-nav .nav-item.active { background: var(--primary); color: #fff; }
.sidebar-nav .nav-item .nav-icon { font-size: 18px; width: 24px; text-align: center; }
.sidebar-nav .nav-section {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--gray-500);
  padding: 16px 12px 6px;
  letter-spacing: .5px;
}
.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--gray-700);
  font-size: 12px;
}
.sidebar-footer .user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.sidebar-footer .user-info .avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 14px;
}
.sidebar-footer .user-info .name { color: #fff; font-weight: 500; }
.sidebar-footer .user-info .role { color: var(--gray-400); font-size: 11px; }

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 24px;
  min-width: 0;
}
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.page-header h1 { font-size: 22px; color: var(--gray-800); }
.page-header .actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ========== Cards & Tables ========== */
.card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-body { padding: 20px; }
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-header h3 { font-size: 16px; color: var(--gray-800); }

.table-wrapper { overflow-x: auto; }
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
table.data-table th {
  background: var(--gray-50);
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--gray-600);
  border-bottom: 2px solid var(--gray-200);
  white-space: nowrap;
}
table.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}
table.data-table tbody tr:hover { background: var(--gray-50); }
table.data-table .actions-cell { white-space: nowrap; }
table.data-table .actions-cell button { margin-right: 4px; }

/* ========== Badges ========== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}
.badge-primary { background: var(--primary-light); color: var(--primary-dark); }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }

/* ========== Modal ========== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}
.modal {
  background: #fff;
  border-radius: 12px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.modal.modal-lg { max-width: 900px; }
.modal.modal-sm { max-width: 400px; }
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h3 { font-size: 18px; color: var(--gray-800); }
.modal-header .close-btn {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--gray-400);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}
.modal-header .close-btn:hover { background: var(--gray-100); color: var(--gray-600); }
.modal-body { padding: 20px; }
.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ========== Unsaved Content Overlay ========== */
.unsaved-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1100;
  padding: 20px;
}
.unsaved-box {
  background: #fff;
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.unsaved-icon { font-size: 32px; margin-bottom: 8px; }
.unsaved-box h3 { font-size: 17px; color: var(--gray-800); margin: 0 0 8px; }
.unsaved-box p { font-size: 14px; color: var(--gray-600); margin: 0 0 20px; line-height: 1.6; }
.unsaved-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }

/* ========== Stats Cards ========== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 16px;
}
.stat-card .stat-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.stat-card .stat-info .stat-value { font-size: 28px; font-weight: 700; color: var(--gray-800); }
.stat-card .stat-info .stat-label { font-size: 13px; color: var(--gray-500); }

/* ========== Search Bar ========== */
.search-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.search-bar .form-control { max-width: 300px; }

/* ========== Empty State ========== */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--gray-400);
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ========== Toast ========== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 20px;
  border-radius: var(--radius);
  color: #fff;
  font-size: 14px;
  box-shadow: var(--shadow-md);
  animation: slideIn .3s ease;
  max-width: 400px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ========== Mobile Toggle ========== */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 101;
  background: var(--gray-900);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  font-size: 20px;
  align-items: center;
  justify-content: center;
}
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.5);
  z-index: 99;
}

/* ========== BOM Items Table ========== */
.bom-items-editor { margin-top: 16px; }
.bom-item-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}
.bom-item-row select { flex: 2; }
.bom-item-row input { flex: 1; }
.bom-item-row .remove-btn {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border: 1px solid var(--danger);
  background: #fff;
  color: var(--danger);
  border-radius: var(--radius);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bom-item-row .remove-btn:hover { background: var(--danger); color: #fff; }

/* ========== Result Tables (BOM calculation) ========== */
.result-section { margin-bottom: 24px; }
.result-section h4 {
  font-size: 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.result-table th { font-size: 12px; }
.result-table td { font-size: 12px; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  :root { --sidebar-width: 260px; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .mobile-toggle { display: flex; }
  .main-content {
    margin-left: 0;
    padding: 56px 16px 16px;
  }
  .form-row { flex-direction: column; gap: 0; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-card { padding: 14px; }
  .stat-card .stat-icon { width: 40px; height: 40px; font-size: 20px; }
  .stat-card .stat-info .stat-value { font-size: 22px; }
  .page-header h1 { font-size: 18px; }
  .modal { max-width: 100%; }
  .search-bar .form-control { max-width: 100%; flex: 1; }
  table.data-table { font-size: 12px; }
  table.data-table th, table.data-table td { padding: 8px; }
}

/* ========== Print Styles ========== */
@media print {
  .sidebar, .mobile-toggle, .page-header .actions, .no-print { display: none !important; }
  .main-content { margin-left: 0; padding: 0; }
  body { background: #fff; }
}

.print-only { display: none; }
@media print {
  .print-only { display: block; }
  .screen-only { display: none !important; }
}

/* ========== Print Document ========== */
.print-document {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px;
  font-size: 14px;
}
.print-document h1 { text-align: center; font-size: 24px; margin-bottom: 8px; }
.print-document .doc-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--gray-600);
}
.print-document table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }
.print-document th, .print-document td {
  border: 1px solid var(--gray-300);
  padding: 8px 12px;
  text-align: left;
  font-size: 13px;
}
.print-document th { background: var(--gray-100); font-weight: 600; }
.print-document .sign-area {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  font-size: 14px;
}
.print-document .sign-area div { width: 200px; }
.print-document .sign-area .sign-line {
  border-bottom: 1px solid var(--gray-400);
  height: 40px;
  margin-bottom: 4px;
}
.print-document .footer { text-align: center; margin-top: 32px; font-size: 12px; color: var(--gray-400); }

/* ========== Misc ========== */
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--gray-500); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 8px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }
.hidden { display: none !important; }
.cursor-pointer { cursor: pointer; }