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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
}

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

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h1 {
  padding: 20px 0;
  color: #667eea;
  font-size: 2rem;
  text-align: center;
}

.header h1 i {
  margin-right: 10px;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding-bottom: 20px;
}

.tab-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.tab-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.tab-btn.active {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
}

.tab-btn i {
  margin-right: 8px;
}

/* Main Content */
.main {
  padding: 40px 0;
}

.section {
  display: none;
}

.section.active {
  display: block;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Cards */
.card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card h2 {
  color: #667eea;
  margin-bottom: 25px;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
}

.card h2 i {
  margin-right: 10px;
}

/* Forms */
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 600;
  color: #555;
  font-size: 0.9rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

input, select, textarea {
  padding: 12px 16px;
  border: 2px solid #e1e5e9;
  border-radius: 10px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: white;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-success {
  background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
  color: white;
}

.btn-warning {
  background: linear-gradient(135deg, #f2994a 0%, #f2c94c 100%);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
  color: white;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* List Container */
.list-container {
  display: grid;
  gap: 15px;
}

.list-item {
  background: white;
  border-radius: 15px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  border-left: 4px solid #667eea;
}

.list-item:hover {
  transform: translateX(5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.item-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #333;
}

.item-info {
  color: #666;
  margin-bottom: 15px;
  line-height: 1.6;
}

.item-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Footer */
.footer {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  text-align: center;
  padding: 20px 0;
  margin-top: 40px;
  box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.1);
}

.footer p {
  color: #666;
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .nav-tabs {
    flex-direction: column;
    align-items: center;
  }
  
  .tab-btn {
    width: 200px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: 20px;
  }
  
  .item-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  
  .item-actions {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.3rem;
  }
  
  .card {
    padding: 15px;
  }
  
  .btn {
    padding: 10px 16px;
    font-size: 0.9rem;
  }
}

/* Animations */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.list-item {
  animation: slideIn 0.3s ease-out;
}

/* 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: white;
  animation: spin 1s ease-in-out infinite;
}

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