:root {
            --primary-color: #8b5cf6; /* Purple */
            --primary-dark: #7c3aed;
            --secondary-color: #6b7280; /* Gray */
            --gradient-start: #8b5cf6;
            --gradient-end: #6b7280;
            --gradient-mid: #7c3aed; /* Added for audio player */
        }
        
        body {
            font-family: 'Inter', sans-serif;
            background-color: #f9fafb;
            padding: 20px;
            margin: 0;
        }
        
        .container {
            max-width: 1000px;
            margin: 0 auto;
        }
        
             /*practice exerise box*/

.student-textarea {
  width: 100%;
  max-width: 100%;
  padding: 14px;
  font-size: 16px;
  line-height: 1.5;
  border: 2px solid #ccc;
  border-radius: 8px;
  box-sizing: border-box;
  resize: vertical;
  background-color: #fafafa;
  transition: all 0.3s ease;
}

.student-textarea:focus {
  border-color: #4CAF50;
  background-color: #fff;
  outline: none;
  box-shadow: 0 0 6px rgba(76, 175, 80, 0.4);
}


.textarea { width: 100%; height: 120px; border-style: ridge; }
    .button { margin-top: 10px; padding: 8px 15px; background: linear-gradient(135deg, #6e8efb, #a777e3);
            color: white;}
    .feedback { margin-top: 20px; padding: 10px; border: 1px solid #ccc; background: #f9f9f9; 
    }
        /* Custom gradient background */
        .brand-gradient {
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
        }
        
        .brand-gradient-text {
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        /* Custom styles for the circular progress bar */
        .progress-ring__circle {
            transform: rotate(-90deg);
            transform-origin: 50% 50%;
            transition: stroke-dashoffset 0.5s ease;
        }
        
        .chat-container {
            max-height: calc(100vh - 200px);
            overflow-y: auto;
        }
        
        /* Custom scrollbar for chat */
        .chat-container::-webkit-scrollbar {
            width: 6px;
        }
        
        .chat-container::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }
        
        .chat-container::-webkit-scrollbar-thumb {
            background: #888;
            border-radius: 10px;
        }
        
        .chat-container::-webkit-scrollbar-thumb:hover {
            background: #555;
        }
        
        /* Animation for typing indicator */
        @keyframes blink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }
        
        .typing-dot {
            animation: blink 1.5s infinite ease-in-out;
        }
        
        .typing-dot:nth-child(2) {
            animation-delay: 0.2s;
        }
        
        .typing-dot:nth-child(3) {
            animation-delay: 0.4s;
        }
        
        /* Payment modal */
        .modal {
            display: none;
            position: fixed;
            z-index: 50;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.5);
        }
        
        .modal-content {
            background-color: #fefefe;
            margin: 15% auto;
            padding: 20px;
            border-radius: 10px;
            width: 80%;
            max-width: 500px;
        }
        
        /* Premium content overlay */
        .premium-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.7);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: white;
            text-align: center;
            z-index: 10;
            border-radius: 8px;
        }
        
        /* Certificate styles */
        .certificate {
            border: 10px solid var(--primary-dark);
            padding: 20px;
            text-align: center;
            background-color: #fff;
            position: relative;
        }
        
        .certificate:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAiIGhlaWdodD0iMTAwIiB2aWV3Qm94PSIwIDAgMTAwIDEwMCI+PHBhdGggZmlsbD0icmdiYSgxMzksMTM5LDEzOSwwLjEpIiBkPSJNNTAgMEw4NyA1MEw1MCAxMDBMMTMgNTBaIi8+PC9zdmc+');
            opacity: 0.1;
            z-index: -1;
        }
        
        /* Audio Player Styles */
        .audio-player {
            background: white;
            border-radius: 10px;
            padding: 20px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }
        
        .player-header {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .player-icon {
            width: 50px;
            height: 50px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: white;
            font-size: 1.5rem;
        }
        
        .player-title {
            flex: 1;
        }
        
        .player-title h3 {
            margin: 0;
            font-weight: 600;
        }
        
        .player-title p {
            margin: 0;
            color: var(--secondary-color);
            font-size: 0.9rem;
        }
        
        .progress-container {
            width: 100%;
            height: 8px;
            background: #e5e7eb;
            border-radius: 4px;
            overflow: hidden;
            margin: 15px 0;
            cursor: pointer;
        }
        
        .progress-bar {
            height: 100%;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            border-radius: 4px;
            width: 0%;
        }
        
        .player-controls {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .time {
            font-size: 0.9rem;
            color: var(--secondary-color);
        }
        
        .control-buttons {
            display: flex;
            align-items: center;
        }
        
        .control-btn {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--primary-dark);
            margin: 0 10px;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
        }
        
        .control-btn:hover {
            background: #f3f4f6;
        }
        
        .play-btn {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            color: white;
        }
        
        .play-btn:hover {
            transform: scale(1.05);
            background: linear-gradient(135deg, var(--gradient-mid), var(--gradient-start));
        }
        
        .volume-container {
            display: flex;
            align-items: center;
            margin-left: 15px;
        }
        
        .volume-btn {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--secondary-color);
            margin-right: 10px;
        }
        
        .volume-slider {
            width: 80px;
            -webkit-appearance: none;
            height: 5px;
            border-radius: 5px;
            background: #e5e7eb;
            outline: none;
        }
        
        .volume-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--primary-dark);
            cursor: pointer;
        }
        
        /* Content Area Styles */
        .content-area {
            background: white;
            border-radius: 10px;
            padding: 25px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }
        
        .content-area h3 {
            color: var(--primary-dark);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f3f4f6;
        }
        
        .content-text {
            line-height: 1.6;
        }
        
        .content-text p {
            margin-bottom: 15px;
        }
        
        .content-text ul, .content-text ol {
            margin-bottom: 15px;
            padding-left: 20px;
        }
        
        .content-text li {
            margin-bottom: 8px;
        }
        
        /* Download Button */
        .download-btn {
            display: inline-flex;
            align-items: center;
            padding: 12px 20px;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            color: white;
            border-radius: 8px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            margin-top: 15px;
        }
        
        .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(139, 92, 246, 0.4);
        }
        
        .download-btn i {
            margin-right: 8px;
        }
       

/* ========================= */
/* Responsive adjustments    */
/* ========================= */

/* Tablets (≤ 1024px) */
@media (max-width: 1024px) {
  .container {
    max-width: 90%;
    padding: 0 15px;
  }

  .modal-content {
    width: 90%;
    margin: 10% auto;
  }

  .player-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .player-icon {
    margin-bottom: 10px;
  }

  .volume-container {
    margin-left: 0;
    margin-top: 10px;
  }
}

/* Mobile (≤ 768px) */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .container {
    max-width: 100%;
    padding: 0 10px;
  }

  .student-textarea {
    font-size: 14px;
    padding: 10px;
  }

  .player-controls {
    flex-direction: column;
    gap: 10px;
  }

  .control-buttons {
    margin-bottom: 10px;
  }

  .volume-container {
    width: 100%;
    justify-content: space-between;
  }

  .download-btn {
    width: 100%;
    justify-content: center;
  }

  .certificate {
    padding: 15px;
    border-width: 6px;
  }

  .modal-content {
    margin: 20% auto;
    padding: 15px;
  }
}

/* Small phones (≤ 480px) */
@media (max-width: 480px) {
  .player-header {
    align-items: center;
    text-align: center;
  }

  .player-title h3 {
    font-size: 1rem;
  }

  .player-title p {
    font-size: 0.8rem;
  }

  .control-btn {
    width: 35px;
    height: 35px;
    font-size: 1rem;
    margin: 0 5px;
  }

  .play-btn {
    width: 45px;
    height: 45px;
  }

  .volume-slider {
    width: 60px;
  }

  .content-area {
    padding: 15px;
  }

  .content-area h3 {
    font-size: 1.1rem;
  }

  .content-text {
    font-size: 0.9rem;
  }
}