@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #DBEAFE;
  --secondary: #3B82F6;
  --success: #10B981;
  --success-light: #D1FAE5;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --info: #0891B2;
  --info-light: #CFFAFE;
  --bg: #F8FAFC;
  --bg-card: #FFFFFF;
  --text: #1E293B;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --sidebar-width: 260px;
  --sidebar-collapsed: 64px;
  --header-height: 56px;
}

* {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html, body {
  height: 100%;
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: linear-gradient(180deg, #1E293B 0%, #0F172A 100%);
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
  transition: width 0.2s ease;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-header h1 {
  font-size: 16px;
  font-weight: 600;
  color: #F8FAFC;
  margin: 0;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  padding: 12px 0;
}

.nav-section {
  padding: 16px 0 8px;
}

.nav-section-title {
  padding: 0 20px 8px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #94A3B8;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  color: #CBD5E1;
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: rgba(255,255,255,0.04);
  color: #F8FAFC;
}

.nav-item.active {
  background: rgba(37, 99, 235, 0.15);
  color: #60A5FA;
  border-left-color: #2563EB;
}

.nav-item svg {
  width: 18px;
  height: 18px;
  margin-right: 12px;
  flex-shrink: 0;
  opacity: 0.7;
}

.nav-item.active svg { opacity: 1; }

/* Main Layout */
.main-wrapper {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-header {
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.main-content {
  flex: 1;
  padding: 24px;
}

/* Page Title */
.page-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 4px;
}

.page-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 20px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.card-body {
  padding: 20px;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table thead th {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
  vertical-align: middle;
}

.data-table tbody tr:hover td {
  background: #F8FAFC;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

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

.btn-secondary {
  background: white;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--bg);
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover {
  background: #DC2626;
}

.btn-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.btn-success:hover {
  background: #059669;
}

.btn-sm {
  padding: 5px 12px;
  font-size: 13px;
  border-radius: 6px;
}

.btn-icon {
  padding: 6px;
  border-radius: 6px;
}

/* Form elements */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 9px 12px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-sizing: border-box;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}

.form-input::placeholder {
  color: var(--text-light);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 36px;
}

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 999px;
  white-space: nowrap;
}

.badge-success {
  background: var(--success-light);
  color: #065F46;
}

.badge-warning {
  background: var(--warning-light);
  color: #92400E;
}

.badge-danger {
  background: var(--danger-light);
  color: #991B1B;
}

.badge-info {
  background: var(--info-light);
  color: #155E75;
}

.badge-default {
  background: #F1F5F9;
  color: #475569;
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-success {
  background: var(--success-light);
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.alert-danger {
  background: var(--danger-light);
  color: #991B1B;
  border: 1px solid #FECACA;
}

.alert-warning {
  background: var(--warning-light);
  color: #92400E;
  border: 1px solid #FDE68A;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: white;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  max-width: 520px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.96);
  transition: transform 0.2s ease;
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
}

.modal-body {
  padding: 20px 24px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* Toast */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: white;
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  min-width: 280px;
  animation: toastIn 0.3s ease;
  border-left: 4px solid var(--primary);
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes toastIn {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toastOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120%); opacity: 0; }
}

.toast.leaving {
  animation: toastOut 0.3s ease forwards;
}

/* Loading */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state p {
  font-size: 14px;
  margin: 0;
}

/* Page header actions */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-header-left {
  flex: 1;
}

.page-header-right {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Stats cards */
.stat-card {
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-change {
  font-size: 12px;
  margin-top: 8px;
  font-weight: 500;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* Search & Filter */
.search-bar {
  position: relative;
}

.search-bar input {
  padding-left: 36px;
}

.search-bar svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-light);
}

.import-guide {
  align-items: flex-start;
  gap: 16px;
}

.import-hint {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-wrapper {
    margin-left: 0;
  }
  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
    display: none;
  }
  .sidebar-backdrop.active {
    display: block;
  }
}

@media (max-width: 768px) {
  .main-content {
    padding: 16px;
  }
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .card-body {
    padding: 16px;
    overflow-x: auto;
  }
}

/* Login page */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 50%, #1E293B 100%);
}

.login-box {
  background: white;
  border-radius: 16px;
  box-shadow: 0 25px 80px rgba(0,0,0,0.3);
  width: 100%;
  max-width: 400px;
  padding: 40px 36px;
}

.login-title {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 8px;
  color: var(--text);
}

.login-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
  margin: 0 0 28px;
}

/* Table actions */
.table-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}

.table-actions .btn-icon {
  color: var(--text-muted);
  background: transparent;
  border: none;
}

.table-actions .btn-icon:hover {
  background: var(--bg);
  color: var(--text);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  padding: 12px 0;
}

.pagination button {
  padding: 6px 12px;
  font-size: 13px;
  border: 1px solid var(--border);
  background: white;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text);
}

.pagination button:hover:not(:disabled) {
  background: var(--bg);
}

.pagination button.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}