:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #10b981;
  --success-hover: #059669;
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --purple: #8b5cf6;

  --bg-main: #f8fafc;
  --bg-sidebar: #0f172a;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
}

[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-sidebar: #050811;
  --bg-card: #111827;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --border: #1f2937;
  --primary-light: #1e293b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
}

/* Sidebar Layout */
.app-sidebar {
  width: 250px;
  background-color: var(--bg-sidebar);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  flex-shrink: 0;
}

.brand-header {
  font-size: 1.25rem;
  font-weight: 800;
  color: #60a5fa;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.5rem;
}

.nav-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-grow: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: #94a3b8;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  background-color: #1e293b;
  color: #ffffff;
}

.nav-link.active {
  background-color: var(--primary);
}

.sub-nav-link {
  font-size: 0.9rem;
  padding: 0.55rem 0.75rem;
  color: #94a3b8;
  border-radius: 0.375rem;
}

.sub-nav-link:hover {
  background-color: #1e293b;
  color: #ffffff;
}

.sub-nav-link.active {
  background-color: #1e293b;
  color: #60a5fa;
  font-weight: 700;
}

/* Main Container */
.app-container {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.top-bar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
}

.role-pill {
  font-size: 0.75rem;
  background-color: var(--primary-light);
  color: var(--primary);
  padding: 0.2rem 0.6rem;
  border-radius: 1rem;
  text-transform: uppercase;
}

.main-content {
  padding: 2rem;
  overflow-y: auto;
}

/* Glass & Card Design */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  margin-bottom: 1.5rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

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

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

.btn-purple { background-color: var(--purple); color: #fff; }

.btn-secondary { background-color: var(--border); color: var(--text-main); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; }

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background-color: var(--bg-card);
  color: var(--text-main);
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th, .table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.table th {
  background-color: var(--primary-light);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.table tbody tr:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

/* Status Badges */
.status-badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.status-paid { background-color: #d1fae5; color: #047857; }
.status-pending { background-color: #fef3c7; color: #b45309; }
.status-draft { background-color: #e0f2fe; color: #0369a1; }
.status-converted { background-color: #e0e7ff; color: #4338ca; }
.status-cancelled { background-color: #fee2e2; color: #b91c1c; }

/* Metric Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.metric-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.metric-value {
  font-size: 1.6rem;
  font-weight: 800;
}

/* Modal Window */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background-color: var(--bg-card);
  border-radius: 0.75rem;
  width: 95%;
  max-width: 975px;
  max-height: 92vh;
  overflow-y: auto;
  padding: 2.5rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
  font-size: 1.1rem;
  zoom: 0.9;
}

.maintenance-container {
  zoom: 0.9;
}



.modal-card .modal-header h2 {
  font-size: 1.6rem !important;
}

.modal-card .form-label {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.modal-card .form-control {
  font-size: 1.05rem;
  padding: 0.75rem 1rem;
}

.modal-card .table {
  font-size: 1.05rem;
}

.modal-card .btn {
  font-size: 1.05rem;
  padding: 0.65rem 1.35rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

/* Login Page Layout */
.login-body {
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  padding: 2.5rem;
  color: #ffffff;
}

/* Column Resizer Styles */
.col-resizer {
  position: absolute;
  top: 0;
  right: 0;
  width: 7px;
  cursor: col-resize;
  user-select: none;
  height: 100%;
  z-index: 10;
  transition: background-color 0.2s ease;
}

.col-resizer:hover, .col-resizer.resizing {
  background-color: var(--primary, #2563EB);
  opacity: 0.8;
}

.table th {
  position: relative;
}

/* 📱 Mobile Responsiveness 📱 */

/* Mobile Header (Hamburger Menu) */
.mobile-header {
  display: none;
  background-color: var(--bg-sidebar);
  color: #fff;
  padding: 1rem;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #334155;
  position: sticky;
  top: 0;
  z-index: 50;
}

.hamburger-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 40;
}

.mobile-overlay.active {
  display: block;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }
  
  .mobile-header {
    display: flex;
  }

  /* Transform Sidebar to Off-Canvas */
  .app-sidebar {
    position: fixed;
    left: -250px;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: left 0.3s ease;
    box-shadow: 2px 0 8px rgba(0,0,0,0.5);
  }

  .app-sidebar.active {
    left: 0;
  }
  
  /* Hide Brand Header in sidebar if mobile header handles it */
  .app-sidebar .brand-header {
    display: none;
  }

  .app-container {
    width: 100%;
    margin-left: 0;
  }

  /* Form Layouts & Grids */
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .card form[style*="display: grid"] {
    grid-template-columns: 1fr !important;
  }
  
  .card form[style*="display: flex"] {
    flex-direction: column;
    align-items: stretch !important;
  }

  /* Ensure inputs take full width */
  .form-control, .btn {
    width: 100%;
  }

  /* Tables */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
  }

  .table {
    min-width: 600px; /* Force scroll on tiny screens */
  }

  /* Top Bar */
  .top-bar {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem;
  }

  .user-info {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  /* Page Headers */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .page-header > div:last-child {
    width: 100%;
    display: flex;
    flex-direction: column;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .login-card {
    margin: 1rem;
    padding: 1.5rem;
  }
}