:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --info: #0284c7;
  --dark: #0f172a;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background-color: #ffffff;
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
  transition: transform 0.3s ease;
}

.sidebar-brand {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-200);
}

.sidebar-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.sidebar-brand h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: var(--gray-600);
  text-decoration: none;
  font-weight: 500;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

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

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding-bottom: 70px; /* Space for mobile bottom bar */
}

/* Top Navigation Bar */
.topbar {
  background-color: #ffffff;
  border-bottom: 1px solid var(--gray-200);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-700);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.wallet-badge {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.user-dropdown {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--gray-800);
}

.user-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary-light);
}

/* Page Content */
.content-area {
  padding: 24px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.announcement-bar {
  background-color: #fef3c7;
  color: #92400e;
  padding: 10px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid #fde68a;
}

/* Cards & Grid */
.grid {
  display: grid;
  gap: 20px;
}

.grid-cols-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}

.stat-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.icon-blue { background: #dbeafe; color: #1e40af; }
.icon-green { background: #dcfce7; color: #166534; }
.icon-amber { background: #fef3c7; color: #92400e; }
.icon-purple { background: #f3e8ff; color: #6b21a8; }

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

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

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

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

.btn-secondary {
  background-color: var(--gray-200);
  color: var(--gray-700);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.2s;
  background-color: #ffffff;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  background: #ffffff;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background-color: var(--gray-100);
  color: var(--gray-700);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-200);
  color: var(--gray-800);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #e0f2fe; color: #075985; }

/* Mobile Bottom Navigation Bar */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: #ffffff;
  border-top: 1px solid var(--gray-200);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
  z-index: 50;
  justify-content: space-around;
  align-items: center;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  gap: 4px;
  flex: 1;
}

.bottom-nav-item.active {
  color: var(--primary);
  font-weight: 700;
}

.bottom-nav-item svg {
  width: 22px;
  height: 22px;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-backdrop.show {
  display: flex;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  padding: 24px;
  position: relative;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-600);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-toggle {
    display: block;
  }

  .bottom-nav {
    display: flex;
  }

  .content-area {
    padding: 16px;
  }

  .topbar {
    padding: 10px 16px;
  }
}