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

:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --dark-bg: #0f172a;
  --card-bg: #ffffff;
  --sidebar-bg: #1e293b;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--text-primary);
}

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

/* Header */
.top-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 1000;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sidebar-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.sidebar-toggle:hover {
  background: var(--border-color);
}

.app-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-color);
}

.header-right {
  display: flex;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--border-color);
  border-radius: 2rem;
}

.user-name {
  font-weight: 500;
}

.user-role {
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
}

.logout-btn {
  color: var(--danger-color);
  text-decoration: none;
  padding: 0.5rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

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

/* Sidebar */
.sidebar {
  position: fixed;
  top: 70px;
  left: 0;
  width: 280px;
  height: calc(100vh - 70px);
  background: var(--sidebar-bg);
  transition: transform 0.3s ease;
  z-index: 999;
  overflow-y: auto;
}

.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar-nav {
  padding: 2rem 0;
}

.nav-list {
  list-style: none;
}

.nav-item {
  margin: 0.5rem 1rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  color: #cbd5e1;
  text-decoration: none;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav-link.active {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.nav-link i {
  font-size: 1.1rem;
  width: 20px;
}

/* Main Content */
.main-content {
  margin-left: 280px;
  margin-top: 70px;
  padding: 2rem;
  width: calc(100% - 280px);
  transition: all 0.3s ease;
}

.main-content.expanded {
  margin-left: 0;
  width: 100%;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-bottom: 2rem;
}

.card-header {
  display: flex;
  justify-content: between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: white;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

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

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

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

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

.table th {
  background: var(--border-color);
  font-weight: 600;
  color: var(--text-primary);
}

.table tr:hover {
  background: rgba(37, 99, 235, 0.05);
}

/* Status badges */
.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.status-pending {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning-color);
}

.status-approved {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success-color);
}

.status-rejected {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
}

.status-waiting {
  background: rgba(100, 116, 139, 0.1);
  color: var(--secondary-color);
}

/* Login Page */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
}

.login-card {
  background: var(--card-bg);
  padding: 3rem;
  border-radius: 1.5rem;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.login-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 2rem;
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger-color);
  padding: 1rem;
  border-radius: 0.75rem;
  margin-bottom: 1rem;
  text-align: center;
}

/* Dashboard Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  text-align: center;
  transition: transform 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
}

.stat-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

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

  .main-content {
    margin-left: 0;
    width: 100%;
    padding: 1rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* Loading spinner */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

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

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: var(--card-bg);
  margin: 5% auto;
  padding: 2rem;
  border-radius: 1rem;
  width: 90%;
  max-width: 600px;
  box-shadow: var(--shadow-lg);
}

.close {
  color: var(--text-secondary);
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover {
  color: var(--text-primary);
}