/* General Styles */
:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #34495e;
    --text-color: #333;
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
  }
  
  /* Header Styles */
  .app-header {
    background-color: var(--secondary-color);
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }
  
  .app-header h1 {
    margin: 0;
    font-size: 2rem;
  }
  
  /* Search Section Styles */
  .search-section {
    background-color: var(--light-color);
    padding: 1.5rem 0;
    margin-bottom: 2rem;
  }
  
  .search-section input,
  .search-section select {
    border-radius: 4px;
    border: 1px solid #ddd;
    padding: 0.5rem;
    width: 100%;
  }
  
  .tags-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  
  .tag-badge {
    display: inline-block;
    background-color: #e9ecef;
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background-color var(--transition-speed);
  }
  
  .tag-badge.active {
    background-color: var(--primary-color);
    color: white;
  }
  
  /* Assignment Card Styles */
  .assignment-card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  }
  
  .assignment-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  }
  
  .card-img-container {
    height: 180px;
    overflow: hidden;
  }
  
  .card-img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-speed);
  }
  
  .assignment-card:hover .card-img-container img {
    transform: scale(1.05);
  }
  
  .card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
  }
  
  .card-title {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--secondary-color);
    font-size: 1.25rem;
  }
  
  .card-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
    color: #6c757d;
  }
  
  .card-tags {
    margin-bottom: 1rem;
  }
  
  .card-description {
    margin-bottom: 1.5rem;
    flex-grow: 1;
  }
  
  .card-content .btn {
    align-self: flex-start;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: background-color var(--transition-speed);
  }
  
  .card-content .btn:hover {
    background-color: #2980b9;
    border-color: #2980b9;
  }
  
  /* No Results Styles */
  .no-results {
    text-align: center;
    padding: 3rem 1rem;
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
  }
  
  .no-results h3 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
  }
  
  .no-results p {
    color: #6c757d;
  }
  
  /* Footer Styles */
  .app-footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
  }
  
  /* Responsive Styles - Mobile First */
  @media (max-width: 576px) {
    .app-header h1 {
      font-size: 1.5rem;
    }
    
    .card-img-container {
      height: 150px;
    }
    
    .card-content {
      padding: 1rem;
    }
    
    .card-title {
      font-size: 1.1rem;
    }
  }
  
  /* Animation for new cards */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  .fade-in {
    animation: fadeIn 0.5s ease forwards;
  }
  
  /* Touch feedback for mobile */
  .touch-feedback {
    position: relative;
    overflow: hidden;
  }
  
  .touch-feedback::after {
    content: '';
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.7) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform 0.5s, opacity 1s;
  }
  
  .touch-feedback:active::after {
    transform: scale(0, 0);
    opacity: 0.3;
    transition: 0s;
  }