* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --bg-color: #111010;
            --text-color: #e8eaed;
            --text-color-secondary: #bdc1c6;
            --card-yellow: #fdd663;
            --card-blue: #5c9ce5;
            --card-grey: #c5c5c5;
            --card-sky: #87CEEB;
            --card-lavender: #E6E6FA;
            --card-sage: #B0C4B1;
            --card-dark-blue: #1F4E79;
            --card-purple: #c5a5e8;
            --card-text-color: #202124;
            --card-rich-black: #101820;
        }

                body {
             overflow-x: hidden;
             font-family: 'Google Sans', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        /*  Header Styling */
        header {
            padding: 24px 0;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .nav-left {
            font-size: 1.2rem;
            font-weight: 500;
        }
        
        .nav-right {
            display: flex;
            align-items: center;
            gap: 24px;
        }
        
        /* Hero Section */
        .hero-text {
            margin-bottom: 48px;
            text-align: center;
        }

        .hero-text h1 {
            font-size: 5rem;
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 8px;
        }

        .hero-text p {
            font-size: 2.5rem;
            font-weight: 400;
            color: var(--text-color-secondary);
        }
                @media (max-width: 992px) {
   
            .hero-text h1 { font-size: 3rem; }
            .hero-text p { font-size: 1.5rem; }
            .card-grid { grid-template-columns: repeat(2, 1fr); }
        }
        
        @media (max-width: 768px) {

          
            nav { flex-direction: row; gap: 16px; margin-bottom: 70px;position: fixed; justify-content: space-between;width: 90vw; }
            .hero-text h1 { font-size: 2.5rem;margin-top: 60px; }
            .hero-text p { font-size: 1.25rem; }
           
        }


        /* Utility Classes */
        .hidden {
            display: none !important;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 1rem;
        }

        @media (min-width: 768px) {
            .container {
                padding: 2rem;
            }
        }

        /* Page Layouts */
        .page {
            width: 100%;
            background-color: var(--white);
        }
        
        .page-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            flex-wrap: wrap;
          
        }
        
        .page-header h1 {
            font-size: 1rem;
            font-weight: 700;
        }

        /* Login Page Styles */
        #loginPage {
            max-width: 450px;
            margin: 5rem auto;
            padding: 2rem;
            background-color: var(--white);
            border-radius: 0.75rem;
            box-shadow: var(--shadow);
        }

        #loginPage h1 {
            font-size: 1.5rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 1.5rem;
        }

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

        .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
        }

         /*  Card Grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            width: 100%;
        }

        .card {
            padding: 24px;
            border-radius: 6px;
            text-align: left;
            color: var(--card-text-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 250px;
            transition: transform 0.2s ease-in-out;
        }

        .card:hover {
            transform: scale(1.03);
            box-shadow: 0 8px 30px rgba(0,0,0,0.2);
        }

        .card h2 {
            font-size: 2rem;
            font-weight: 500;
        }
        
        .card p {
            margin-top: 8px;
            font-size: 1rem;
        }

        .btn-container{
            display: flex;
            gap: 20px;
        }

        .card button {

            display: flex;
            background-color: rgba(0, 0, 0, 0.1);
            color: var(--card-text-color);
            border: 1px solid rgba(0, 0, 0, 0.2);
            padding: 10px 16px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            width: fit-content;
            margin-top: 24px;
            display: flex;
            align-items: center;
        }

        .launch-btn:hover {
            background-color: rgba(0, 0, 0, 0.2);
        }
        
        /* Individual Card Colors & Styles */
        .card.sage { background-color: var(--card-sage); }
        .card.lavender { background-color: var(--card-lavender); }
        .card.sky { background-color: var(--card-sky); }
        .card.grey { background-color: var(--card-grey); }
        .card.yellow { background-color: var(--card-yellow); }
        .card.blue { background-color: var(--card-blue); }
        .card.dark-blue {
            background-color: var(--card-dark-blue);
            color: var(--text-color);
        }
        .card.dark-blue .launch-btn {
            color: var(--text-color);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .card.purple { background-color: var(--card-purple); }

                /* 7. Responsive Design for smaller screens */
        @media (max-width: 992px) {

            .card-grid { grid-template-columns: repeat(2, 1fr); }
        }
        
        @media (max-width: 768px) {

            .card-grid { grid-template-columns: repeat(1, 1fr); }
            .footer-content { flex-direction: column; gap: 16px; }
        }



        .form-input {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--medium-gray);
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: border-color 0.2s;
        }

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

        .back-to-dashboard {
            background-color: var(--primary-color);
            color: black;
            border: none;
           
            border-radius: 0.5rem;
            cursor: pointer;
            font-size: 0.875rem;
            font-weight: 600;
            transition: background-color 0.2s;
        }

        

 /* Sidebar overlay styles */
.sidebar {
  position: fixed;
  top: 0;
  left: -100%; /* Hidden by default */
  width: 100%;
  height: 100%;
  background-color: rgb(0, 0, 0); /* Optional dark overlay */
  color: white;
  padding: 2rem;
  z-index: 1000;
}

/* When sidebar is open */
.sidebar.open {
  left: 0;
}

/* Close button styles */
.sidebar .close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 2rem;
  background: none;
  border: none;
  color: white;
  cursor: pointer;
}


    .sidebar h2 {
      margin-top: 0;
    }

    .sidebar ul {
    height: 99%;
      position:absolute;
      top:20px;
      left:20px;
      list-style: none;
      padding: 0;
      text-decoration: none;

    }

    .sidebar .bottom {
      position: absolute;
      bottom: 30px;
      left: 15px;
    }


    .sidebar ul li {
      margin: 1rem 0;
      text-decoration: none;
      font-size: 42px;

    }
    .sidebar ul li a{
      text-decoration: none;
      color: white;
    }

        .btn {
            display: inline-block;
            
            padding: 0.75rem .6rem;
            border: none;
            border-radius: 0.5rem;
            font-size: 1rem;
            font-weight: 600;
            color: var(--white);
            background-color: #B0C4B1;
            border: 1px solid white;
            cursor: pointer;
            transition: background-color 0.2s;
            text-align: center;
        }

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

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

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

        .btn-danger:hover {
            background-color: var(--danger-hover);
        }
        
        .btn-secondary {
            background-color: #6b7280;
        }
        .btn-secondary:hover {
            background-color: #4b5563;
        }

        #loginError {
            color: var(--danger-color);
            font-size: 0.875rem;
            text-align: center;
            margin-top: 1rem;
            min-height: 1.25rem;
        }

        #userIdDisplay {
            margin-top: 1rem;
            text-align: center;
            font-size: 0.75rem;
            color: #6b7280;
            font-family: monospace;
        }

        /* Dashboard Styles */
        #moduleList {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }

        @media (min-width: 768px) {
            #moduleList {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            #moduleList {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        .module-card {
          padding: 24px;
            border-radius: 6px;
            text-align: left;
            color: var(--card-text-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 250px;
            transition: transform 0.2s ease-in-out;
        }

        .module-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .module-card h2 {
          font-size: 2rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .module-card p {
            color: #000000;
            font-size: 0.875rem;
            flex-grow: 1;
        }

        .module-card button {

display: flex;
background-color: rgba(0, 0, 0, 0.1);
color: var(--card-text-color);
border: 1px solid rgba(0, 0, 0, 0.2);
padding: 10px 16px;
border-radius: 8px;
cursor: pointer;
font-weight: 500;
width: fit-content;
margin-top: 24px;
display: flex;
align-items: center;}

        /* Custom Card Colors */
        .module-card.yellow { background-color: var(--card-yellow); }
        .module-card.blue { background-color: var(--card-blue); }
        .module-card.grey { background-color: var(--card-grey); }
        .module-card.sky { background-color: var(--card-sky); }
        .module-card.lavender { background-color:var(--card-lavender); }
        .module-card.sage { background-color: var(--card-sage); }
        .module-card.dark-blue { background-color: var(--card-dark-blue); }
        .module-card.purple { background-color: var(--card-purple); }

        .module-card.red h2, .module-card.red p,
        .module-card.blue h2, .module-card.blue p,
        .module-card.yellow h2, .module-card.yellow p,
        .module-card.green h2, .module-card.green p,
        .module-card.purple h2, .module-card.purple p,
        .module-card.sky h2, .module-card.sky p {
            color: var(--text-color);
        }

        :root {
            --bg-color: #111010;
            --text-color: #e8eaed;
            --text-color-secondary: #bdc1c6;
            --card-yellow: #fdd663;
            --card-blue: #5c9ce5;
            --card-grey: #c5c5c5;
            --card-sky: #87CEEB;
            --card-lavender: #E6E6FA;
            --card-sage: #B0C4B1;
            --card-dark-blue: #1F4E79;
            --card-purple: #c5a5e8;
            --card-text-color: #202124;
            --card-rich-black: #101820;
        }


        .card-buttons {
            margin-top: 1.5rem;
            display: flex;
            gap: 0.5rem;
        }

        .card-buttons .btn {
            width: auto;
           
            font-size: 0.875rem;
            padding: 0.5rem 1rem;
        }

        .card-active-indicator {
            position: absolute;
            top: 1rem;
            right: 1rem;
            width: 12px;
            height: 12px;
            background-color: var(--success-color);
            border-radius: 50%;
            border: 2px solid var(--white);
            animation: pulse 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        /* Live Session Page */
        .live-session-layout {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 1024px) {
            .live-session-layout {
                grid-template-columns: 1fr 2fr;
            }
        }
        
        .panel {
            background-color: var(--white);
            text-align: left;
            box-shadow: var(--shadow);
            padding: 1.5rem;
        }
        
        .panel h2 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        #sessionPin {
            font-size: 2.5rem;
            font-weight: 700;
            text-align: center;
            letter-spacing: 0.2em;
            color: var(--primary-color);
            background-color: var(--light-gray);
            padding: 1rem;
            border-radius: 0.5rem;
        }

        #qrCodeContainer {
            margin-top: 1rem;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 1rem;
            background-color: var(--white);
            border-radius: 0.5rem;
            border: 1px solid var(--medium-gray);
        }

        #sessionTimer {
            text-align: center;
            font-size: 1.25rem;
            font-weight: 500;
            margin-top: 1rem;
        }
        
        .time-controls {
            margin-top: 1rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        
        .time-controls p {
            font-size: 0.875rem;
            text-align: center;
            color: #6b7280;
            margin-bottom: 0.25rem;
        }
        
        .time-buttons {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
        }
        
        .time-buttons .btn {
            width: auto;
            padding: 0.25rem 0.75rem;
            font-size: 0.875rem;
        }
        
        /* List Styles (for students and past sessions) */
        .data-list {
            list-style: none;
            max-height: 400px;
            overflow-y: auto;
        }

        .data-list li {
            padding: 0.75rem;
            border-bottom: 1px solid var(--light-gray);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .data-list li:last-child {
            border-bottom: none;
        }

        .data-list li.list-item-clickable {
            cursor: pointer;
            transition: background-color 0.2s;
        }
        
        .data-list li.list-item-clickable:hover {
            background-color: var(--light-gray);
        }
        
        .list-item-main {
            font-weight: 500;
        }
        
        .list-item-sub {
            font-size: 0.875rem;
            color: #6b7280;
        }
        
        .list-item-arrow {
            font-size: 1.25rem;
            color: #9ca3af;
        }

        /* Modal Styles */
        .modal-overlay {
            position: fixed;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.485);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .modal-content {
            background-color: white;
            padding: 2rem;
            border-radius: 0.5rem;
            box-shadow: var(--shadow-lg);
            width: 90%;
            max-width: 500px;
            text-align: center;
            position: relative;
        }

        .modal-close {
            position: absolute;
            top: 1rem;
            right: 1rem;
            font-size: 1.5rem;
            font-weight: bold;
            color: #9ca3af;
            cursor: pointer;
            border: none;
            background: none;
        }
        
        .modal-content h2 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        #liveSessionPage{
          background-color: white;
          padding: 10px;
          color: var( --bg-color);
         
        }
                /* Global Styles & Variables */
                :root {
            --bg-color: #111010;
            --text-color: #e8eaed;
            --text-color-secondary: #bdc1c6;
            --card-yellow: #fdd663;
            --card-blue: #5c9ce5;
            --card-grey: #c5c5c5;
            --card-sky: #87CEEB;
            --card-lavender: #E6E6FA;
            --card-sage: #B0C4B1;
            --card-dark-blue: #1F4E79;
            --card-purple: #c5a5e8;
            --card-text-color: #202124;
            --card-rich-black: #101820;
            --border: #d1d5db;
        }
        .time-btn{
            padding: 15px;
            border-radius: 0;
            border: 1px solid var(--border);
        }

        /* Student Dashboard Specific Styles */
        .btn-container {
            display: flex;
            gap: 10px;
            margin-top: 20px;
        }

        .attendance-btn {
            background-color: rgba(105, 104, 104, 0.959) !important;
            color: var(--card-text-color) !important;
            border: 2px solid rgba(0, 0, 0, 0.3) !important;
            padding: 12px 20px !important;
            border-radius: 8px !important;
            cursor: pointer;
            font-weight: 600 !important;
            transition: all 0.3s ease;
            font-size: 14px !important;
        }

        .attendance-btn:hover {
            background-color: rgba(255, 255, 255, 0.4) !important;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }

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

        .form-label {
            display: block;
            text-align: left;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--card-text-color);
        }

        .form-input {
            width: 100%;
            padding: 10px;
            border: 2px solid #e1e5e9;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
            background-color: #f8f9fa;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--card-blue);
            background-color: white;
            box-shadow: 0 0 0 3px rgba(92, 156, 229, 0.1);
        }

        .form-input:readonly {
            background-color: #f1f3f4;
            color: #5f6368;
        }

        /* Error and Success Messages */
        .error-message {
            color: #d93025;
            background-color: #fce8e6;
            border: 1px solid #f4c7c3;
            border-radius: 6px;
            padding: 12px;
            margin-top: 10px;
            font-size: 0.9rem;
            display: none;
        }

        .success-message {
            color: #137333;
            background-color: #e6f4ea;
            border: 1px solid #ceead6;
            border-radius: 6px;
            padding: 12px;
            margin-top: 10px;
            font-size: 0.9rem;
            display: none;
        }

        /* Modal Enhancements */
        .modal-content h2 {
            color: var(--card-text-color);
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
            font-weight: 600;
        }

        .modal-content .btn {
            margin: 0 5px;
           
        }

        /* Overlay Styles */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .overlay-content {
            background-color: white;
            padding: 40px;
            border-radius: 12px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .overlay-content p {
            color: var(--card-text-color);
            font-weight: 500;
        }

        /* Loading Spinner */
        .loading-spinner {
            width: 30px;
            height: 30px;
            border: 3px solid #f3f3f3;
            border-top: 3px solid var(--card-blue);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Responsive Design for Student Dashboard */
        @media (max-width: 768px) {
            .card h2 {
                font-size: 1.5rem;
            }
            
            .btn-container {
                flex-direction: column;
                align-items: stretch;
            }
            

            
            .modal-content {
                margin: 20px;
                width: calc(100% - 40px);
            }
        }

        /* Authentication Styles */
        .auth-container {
            max-width: 450px;
            margin: 2rem auto;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            overflow: hidden;
        }

        .auth-form {
            padding: 2rem;
        }

        .auth-form h2 {
            color: var(--card-text-color);
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
            font-weight: 600;
            text-align: center;
        }

        .auth-btn {
            width: 100%;
            padding: 12px;
            font-size: 1rem;
            font-weight: 600;
            margin-top: 1rem;
        }

        /* Dashboard Header */
        .dashboard-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .user-info {
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 10px;
        }

        .user-info span {
            font-weight: 600;
            color: var(--text-color);
        }

        /* Page visibility */
        .page {
            width: 100%;
        }

        .page.hidden {
            display: none;
        }

        /* Additional responsive styles for auth */
        @media (max-width: 768px) {
            .dashboard-header {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }

            .user-info {
                align-items: center;
                margin-top: 1rem;
            }

            .auth-container {
                margin: 1rem;
                max-width: none;
            }

            .auth-form {
                padding: 1.5rem;
            }
        }