:root {
  --primary-color: #2A9D8F;
  --primary-hover: #21867a;
  --secondary-color: #264653;
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --error-color: #e76f51;
  --success-color: #2a9d8f;
  --font-family: 'Inter', sans-serif;
  --border-radius: 8px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

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

.sidebar {
  width: 250px;
  background-color: var(--secondary-color);
  color: #fff;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

.sidebar-nav {
  flex: 1;
  padding: 20px 0;
}

.sidebar-nav a {
  display: block;
  padding: 12px 20px;
  color: rgba(255, 255, 255, 0.8);
  transition: all 0.2s;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
  background-color: rgba(255, 255, 255, 0.1);
  color: #fff;
  text-decoration: none;
  border-left: 4px solid var(--primary-color);
}

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.topbar {
  background-color: var(--card-bg);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 30px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.content-wrapper {
  padding: 30px;
  flex: 1;
  overflow-y: auto;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: white;
  text-decoration: none;
}

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

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

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.btn-block {
  display: block;
  width: 100%;
}

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

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

.table th, .table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  background-color: #f4f6f8;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.table tbody tr:hover {
  background-color: #fafafa;
}

/* Badges */
.badge {
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-success { background-color: rgba(42, 157, 143, 0.1); color: var(--success-color); }
.badge-danger { background-color: rgba(231, 111, 81, 0.1); color: var(--error-color); }
.badge-info { background-color: rgba(38, 70, 83, 0.1); color: var(--secondary-color); }

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

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

.modal {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  padding: 24px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  transform: translateY(-20px);
  transition: transform 0.3s;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-backdrop.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

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

/* Auth Container */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color);
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

/* Alerts */
.alert {
  padding: 12px;
  border-radius: var(--border-radius);
  margin-bottom: 15px;
  font-size: 0.9rem;
}

.alert-error {
  background-color: rgba(231, 111, 81, 0.1);
  color: var(--error-color);
  border: 1px solid rgba(231, 111, 81, 0.2);
}

.alert-success {
  background-color: rgba(42, 157, 143, 0.1);
  color: var(--success-color);
  border: 1px solid rgba(42, 157, 143, 0.2);
}

.hidden {
  display: none !important;
}