:root {
           --background-color: #0D0C14;
            --card-background: rgba(22, 21, 38, 0.6);
            --border-color: rgba(255, 255, 255, 0.1);
            --primary-glow: #7c3aed;
            --secondary-glow: #4f46e5;
            --text-primary: #F4F4F5;
            --text-secondary: #A0A0B0;
            --font-family: 'Poppins', sans-serif;
        }

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

        body {
            font-family: var(--font-family);
            background-color: var(--background-color);
            background-image:
                radial-gradient(circle at 15% 25%, rgba(124, 58, 237, 0.2), transparent 30%),
                radial-gradient(circle at 85% 75%, rgba(79, 70, 229, 0.2), transparent 30%);
            color: var(--text-primary);
            min-height: 100vh;
            padding: 20px;
        }
        
        @keyframes gradient-flow {
            0% { background-position: 0% 0%; }
            25% { background-position: 100% 0%; }
            50% { background-position: 100% 100%; }
            75% { background-position: 0% 100%; }
            100% { background-position: 0% 0%; }
        }
        
                /* Styling for the creator link */
        .creator {
            color: #ab47bc; /* Bright Purple */
            font-size: 1rem;
            margin-top: 10px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            /* Flicker light fade animation */
            animation: flicker-light 3s infinite linear;
        }

        @keyframes flicker-light {
            0%, 100% {
                opacity: 1;
                text-shadow: 0 0 8px rgba(171, 71, 188, 0.8), 0 0 16px rgba(171, 71, 188, 0.5);
            }
            50% {
                opacity: 0.7;
                text-shadow: 0 0 4px rgba(171, 71, 188, 0.5), 0 0 8px rgba(171, 71, 188, 0.3);
            }
        }

        .creator:hover {
            color: #ce93d8; /* Lighter purple on hover */
            text-shadow: 0 0 12px rgba(206, 147, 216, 1), 0 0 24px rgba(206, 147, 216, 0.8);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        
        /* --- Header & Logo Styles --- */
        .header {
            padding: 40px 20px;
            text-align: center;
            margin-bottom: 30px;
        }

        .header-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 25px;
        }

        .university-logo-wrapper {
            position: relative;
            width: 96px;
            height: 96px;
            border-radius: 50%;
            padding: 4px;
            background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .university-logo-wrapper::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 150%;
            height: 150%;
            background: radial-gradient(circle, rgba(124, 58, 237, 0.3) 0%, transparent 70%);
            filter: blur(20px);
            z-index: -1;
            animation: pulse-glow 4s infinite ease-in-out;
        }

        @keyframes pulse-glow {
            0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
            50% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
        }

        .university-logo {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            object-fit: cover;
            background: var(--background-color);
        }

        .header h1 {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 700;
            background: linear-gradient(90deg, #d9ceff, #ffffff, #c2d3ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -1px;
        }

        .header .subtitle {
            color: var(--text-secondary);
            font-size: 1.1rem;
            margin-top: -10px;
        }

        .header .creator {
            color: #81c784;
            font-size: 1rem;
            margin-top: 5px;
            font-weight: 500;
        }

        /* --- Main Card Wrapper & Tabs --- */
        .main-wrapper {
            background: var(--card-background);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
            backdrop-filter: blur(10px);
            overflow: hidden;
            margin-bottom: 30px;
            position: relative;
        }

        .main-wrapper::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 150px;
            background: radial-gradient(circle at 50% -20%, rgba(124, 58, 237, 0.3), transparent 70%);
            pointer-events: none;
        }

        .tabs {
            display: flex;
            padding: 8px;
            background: rgba(0, 0, 0, 0.2);
            border-bottom: 1px solid var(--border-color);
        }

        .tab {
            flex: 1;
            padding: 15px;
            text-align: center;
            background: transparent;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            border: none;
            color: var(--text-secondary);
            border-radius: 12px;
        }

        .tab.active {
            background: linear-gradient(135deg, var(--secondary-glow), var(--primary-glow));
            color: var(--text-primary);
            box-shadow: 0 5px 15px rgba(124, 58, 237, 0.2);
        }
        
        .tab:hover:not(.active) {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-primary);
        }

        .tab-content {
            display: none;
            padding: 30px;
        }

        .tab-content.active {
            display: block;
        }

        .section-title {
            color: var(--text-primary);
            font-size: 1.5rem;
            margin-bottom: 25px;
        }

        /* --- Forms & Inputs --- */
        .input-section {
            background: rgba(0, 0, 0, 0.15);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 25px;
            margin-bottom: 30px;
        }

        .course-form, .semester-form, .analysis-form {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr auto;
            gap: 15px;
            align-items: end;
        }

        .form-group label {
            color: var(--text-secondary);
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 0.9rem;
            display: block;
        }

        .form-group input, .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: rgba(0, 0, 0, 0.2);
            color: var(--text-primary);
            font-family: var(--font-family);
            -webkit-appearance: none;
            -moz-appearance: none;
            appearance: none;
        }
        
        .form-group select, .editable-field {
            background-color: #000000;
            color: #ffffff;
        }
        
        .form-group option {
            background-color: #111827;
            color: #ffffff;
            padding: 10px;
        }

        .form-group input::placeholder {
            color: var(--text-secondary);
        }

        .form-group input:focus, .form-group select:focus {
            outline: none;
            border-color: var(--primary-glow);
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
        }
        
        .add-btn, .delete-btn, .calculate-btn {
            background: linear-gradient(135deg, var(--secondary-glow), var(--primary-glow));
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 10px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(124, 58, 237, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 46px; /* Align height with inputs */
        }
        
        .calculate-btn {
            background: linear-gradient(135deg, #16a34a, #15803d);
            grid-column: 1 / -1; /* Make button span all columns */
            margin-top: 15px;
        }
        
        .calculate-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(22, 163, 74, 0.3);
        }

        .add-btn:hover, .delete-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
        }
        
        .delete-btn {
            background: linear-gradient(135deg, #444, #222);
            padding: 8px 12px;
            height: auto;
        }
        .delete-btn:hover {
             background: linear-gradient(135deg, #ef4444, #dc2626);
             box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
        }


        /* --- Tables --- */
        .table-container {
            background: rgba(0, 0, 0, 0.15);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            overflow: hidden;
            margin-bottom: 30px;
        }

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

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

        th {
            font-weight: 600;
            color: var(--text-secondary);
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        td {
            font-size: 1rem;
            color: var(--text-primary);
        }

        tbody tr:last-child td {
            border-bottom: none;
        }

        tbody tr:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        
        .editable-field {
            border-radius: 6px;
            padding: 8px 10px;
            width: 100%;
        }
        .editable-field:focus {
            outline: none;
            border-color: var(--primary-glow);
        }

        /* --- Results Section --- */
        .result-section {
            background: rgba(0, 0, 0, 0.15);
            border: 1px solid var(--border-color);
            border-radius: 15px;
            padding: 25px;
            text-align: center;
        }

        .totals {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 25px;
        }

        .total-item {
            background: rgba(0, 0, 0, 0.2);
            padding: 20px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
        }

        .total-item h4 {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 10px;
            text-transform: uppercase;
        }

        .total-item .value {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(90deg, #c5a9ff, #a9c2ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .gpa-result {
            background: linear-gradient(135deg, var(--secondary-glow), var(--primary-glow));
            color: white;
            padding: 25px;
            border-radius: 15px;
            margin-top: 20px;
            display: none; /* Initially hidden */
        }
        
        .gpa-result.show {
            display: block; /* Show when calculated */
        }

        .gpa-result h2 {
            font-size: 1.5rem;
            margin-bottom: 10px;
        }

        .gpa-value {
            font-size: 3rem;
            font-weight: 900;
            margin-bottom: 10px;
        }
        
        .empty-state {
            padding: 60px 20px;
            text-align: center;
            color: var(--text-secondary);
        }

        /* --- Footer --- */
        .footer {
            background: var(--card-background);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 30px;
            backdrop-filter: blur(10px);
            margin-top: 30px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 30px;
            flex-wrap: wrap;
        }
        
        .footer-left {
            display: flex;
            gap: 15px;
        }
        .footer-message {
            text-align: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-grow: 1;
            margin: 0 20px;
            background: linear-gradient(90deg, #d9ceff, #ffffff, #c2d3ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: pulse-text 4s infinite ease-in-out;
        }

        @keyframes pulse-text {
            0%, 100% {
                opacity: 0.8;
                transform: scale(1);
            }
            50% {
                opacity: 1;
                transform: scale(1.02);
            }
        }

        /* Add this to make the layout responsive */
        @media (max-width: 992px) {
            .footer-content {
                flex-direction: column;
                gap: 25px;
            }
        }

        .social-icon {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.1);
        }
        .social-icon svg {
            width: 22px;
            height: 22px;
            fill: var(--text-secondary);
            transition: all 0.3s ease;
        }
        
        .social-icon.whatsapp svg {
            width: 28px;
            height: 28px;
        }

        .social-icon:hover {
            transform: translateY(-3px);
            background: var(--primary-glow);
        }
        .social-icon:hover svg {
            fill: white;
        }

        .profile-pic-wrapper {
            width: 88px;
            height: 88px;
            border-radius: 50%;
            padding: 4px;
            background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
            display: inline-block;
            transition: all 0.3s ease;
        }
        .profile-pic-wrapper:hover {
            transform: scale(1.05);
            box-shadow: 0 0 25px rgba(124, 58, 237, 0.5);
        }

        .profile-pic {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--background-color);
        }
        
        .footer-bottom {
            text-align: center;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }

        .creator-link {
            color: #81c784;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .creator-link:hover {
            color: #a5d6a7;
            text-shadow: 0 0 10px rgba(129, 199, 132, 0.5);
        }
        
        .grade-info {
            background: rgba(252, 165, 3, 0.1);
            border: 1px solid rgba(252, 165, 3, 0.3);
            border-radius: 15px;
            padding: 15px;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }

        .grade-info h4 {
            color: #f6ad55;
            margin-bottom: 8px;
        }

        .grade-scale {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
            gap: 8px;
            font-family: monospace;
            font-size: 0.8rem;
            color: #f6ad55;
        }
        
        /* --- Popups & Analysis Window --- */
        .popup-overlay, .analysis-window {
            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0, 0, 0, 0.7); display: none; justify-content: center;
            align-items: center; z-index: 1000; backdrop-filter: blur(10px);
        }
        .popup-overlay.show, .analysis-window.show { display: flex; }
        
        .popup {
            background: #1c1a2e; border-radius: 20px; padding: 30px;
            max-width: 500px; width: 90%; text-align: center;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
            border: 1px solid var(--border-color);
        }
        
        .analysis-content {
            background: #1c1a2e; border-radius: 20px; padding: 30px;
            max-width: 800px; width: 90%; max-height: 90%; overflow-y: auto;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
            border: 1px solid var(--border-color);
        }
        
        .analysis-title {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--text-primary);
            text-align: center;
        }
        
        .analysis-results {
            background: rgba(0, 0, 0, 0.15);
            border-radius: 15px;
            padding: 20px;
            margin-top: 20px;
            border: 1px solid var(--border-color);
        }
        
        .popup-btn-primary {
            background: linear-gradient(135deg, var(--secondary-glow), var(--primary-glow));
            color: white;
        }
        
        .popup-btn-secondary {
            background: linear-gradient(135deg, #6b7280, #4b5563);
            color: white;
        }
        .popup h3 { color: var(--text-primary); }
        .popup p { color: var(--text-secondary); margin: 15px 0; }
        .popup-btn {
            padding: 12px 25px; border: none; border-radius: 10px; font-weight: 600;
            cursor: pointer; transition: all 0.3s ease;
            margin: 5px;
        }
        .popup-buttons { display: flex; gap: 15px; justify-content: center; flex-wrap: wrap; margin-top: 15px;}
        .popup-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); }

        /* --- Responsive Design --- */
        @media (max-width: 768px) {
            .course-form, .semester-form, .analysis-form {
                grid-template-columns: 1fr;
            }
            .add-btn {
                grid-column: 1 / -1;
            }
            .header-content { gap: 20px; }
            .tab { padding: 12px 10px; font-size: 1rem; }
            .tab-content { padding: 20px; }
            .footer-content {
                flex-direction: column;
                justify-content: center;
                gap: 25px;
            }
            .footer-left, .footer-right { justify-content: center; }
        }