:root {
  --primary: #3b82f6;
  --primary-dark: #1e40af;
  --secondary: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  --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;
  --white: #ffffff;
}

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

html,
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  background-color: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

.navbar-brand {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
}

.navbar-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.navbar-menu a {
  color: var(--gray-700);
  font-weight: 500;
  transition: color 0.3s;
}

.navbar-menu a:hover {
  color: var(--primary);
}

.navbar-menu a.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}

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

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--gray-700);
}

input,
textarea,
select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: 0.375rem;
  font-size: 1rem;
  transition: border-color 0.3s;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

button,
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.375rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-block;
  text-align: center;
}

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

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

.btn-secondary {
  background-color: var(--gray-300);
  color: var(--gray-900);
}

.btn-secondary:hover {
  background-color: var(--gray-400);
}

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

.btn-danger:hover {
  background-color: #dc2626;
}

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

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

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Card */
.card {
  background-color: white;
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

.card-title {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--gray-900);
}

.card-body {
  margin-top: 1rem;
}

/* Alert */
.alert {
  padding: 1rem;
  border-radius: 0.375rem;
  margin-bottom: 1.5rem;
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border: 1px solid #6ee7b7;
}

.alert-error {
  background-color: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-warning {
  background-color: #fef3c7;
  color: #92400e;
  border: 1px solid #fcd34d;
}

.alert-info {
  background-color: #dbeafe;
  color: #1e40af;
  border: 1px solid #93c5fd;
}

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th,
td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

th {
  background-color: var(--gray-100);
  font-weight: 600;
  color: var(--gray-700);
}

tr:hover {
  background-color: var(--gray-50);
}

/* Sidebar */
.sidebar {
  display: none;
  position: fixed;
  left: 0;
  top: 70px;
  width: 250px;
  height: calc(100vh - 70px);
  background-color: var(--gray-900);
  overflow-y: auto;
  z-index: 999;
}

.sidebar.active {
  display: block;
}

.sidebar-menu {
  list-style: none;
  padding: 1rem 0;
}

.sidebar-menu li {
  padding: 0;
}

.sidebar-menu a {
  display: block;
  padding: 0.75rem 1.5rem;
  color: var(--gray-300);
  transition: all 0.3s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
  background-color: var(--primary);
  color: white;
  padding-left: 2rem;
}

.main-content {
  padding: 2rem 0;
}

/* Dashboard Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background-color: white;
  padding: 1.5rem;
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border-left: 4px solid var(--primary);
}

.stat-label {
  color: var(--gray-500);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.stat-value {
  font-size: 2rem;
  font-weight: bold;
  color: var(--gray-900);
}

/* Auth Page */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.auth-form {
  background-color: white;
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 400px;
}

.auth-form h1 {
  margin-bottom: 1.5rem;
  color: var(--gray-900);
}

.auth-form .form-group:last-child {
  margin-bottom: 0;
}

.auth-footer {
  text-align: center;
  margin-top: 1rem;
  color: var(--gray-600);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar-menu {
    display: none;
  }

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

  .sidebar {
    width: 100%;
    top: 70px;
  }
}