/* --- THEME CONFIGURATION --- */
        :root {
            --primary: #8b5cf6;      /* Bright Violet */
            --secondary: #7c3aed;    /* Deep Purple */
            --accent: #c4b5fd;       /* Soft Lavender */
            --danger: #ef4444;       /* Red for low scores */
            --success: #10b981;      /* Green for high scores */
            
            --bg-color: #020617;     /* Deepest Black-Blue */
            --glass-bg: rgba(15, 23, 42, 0.75); 
            --glass-border: rgba(139, 92, 246, 0.15);
            
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --text-dim: #64748b;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            /* Ambient Background Glows */
            background-image: 
                radial-gradient(circle at 5% 5%, rgba(139, 92, 246, 0.15) 0%, transparent 45%),
                radial-gradient(circle at 95% 95%, rgba(124, 58, 237, 0.15) 0%, transparent 45%);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            padding: 40px 20px;
        }

        /* --- MAIN GLASS CARD --- */
        .container {
            width: 100%;
            max-width: 600px;
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: 24px;
            box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.7);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            margin: auto;
        }

        .content-padding {
            padding: 40px;
        }

        header {
            text-align: center;
            margin-bottom: 35px;
        }

        h1 {
            font-weight: 800;
            font-size: 1.8rem;
            margin-bottom: 6px;
            background: linear-gradient(to right, #ddd6fe, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 25px rgba(139, 92, 246, 0.3);
        }

        p.subtitle {
            color: var(--text-muted);
            font-size: 0.9rem;
            letter-spacing: 0.5px;
        }

        /* --- CUSTOM ANIMATED DROPDOWN --- */
        .dropdown-container {
            position: relative;
            margin-bottom: 25px;
            width: 100%;
        }

        .dropdown-header {
            width: 100%;
            padding: 16px 20px;
            background: rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid rgba(139, 92, 246, 0.2);
            border-radius: 16px;
            color: #f8fafc;
            font-size: 1.1rem;
            font-weight: 500;
            outline: none;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .dropdown-header:hover {
            background: rgba(255, 255, 255, 0.07);
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(139, 92, 246, 0.2);
        }

        .dropdown-header.active {
            background: rgba(0, 0, 0, 0.4);
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
            border-radius: 16px 16px 0 0;
        }

        .dropdown-arrow {
            font-size: 0.7rem;
            color: var(--accent);
            transition: transform 0.3s ease;
        }

        .dropdown-arrow.active {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .dropdown-list {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: rgba(15, 23, 42, 0.95);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(139, 92, 246, 0.2);
            border-top: none;
            border-radius: 0 0 16px 16px;
            overflow: hidden;
            z-index: 10;
            max-height: 0;
            opacity: 0;
            transform: translateY(-10px);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
        }

        .dropdown-list.active {
            max-height: 300px;
            opacity: 1;
            transform: translateY(0);
            /* Enable scrolling */
            overflow-y: auto;
        }

        /* Custom scrollbar for dropdown */
        .dropdown-list::-webkit-scrollbar {
            width: 6px;
        }

        .dropdown-list::-webkit-scrollbar-track {
            background: rgba(139, 92, 246, 0.1);
            border-radius: 3px;
        }

        .dropdown-list::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 3px;
        }

        .dropdown-list::-webkit-scrollbar-thumb:hover {
            background: var(--secondary);
        }

        .dropdown-item {
            padding: 14px 20px;
            cursor: pointer;
            transition: all 0.2s ease;
            border-bottom: 1px solid rgba(139, 92, 246, 0.1);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .dropdown-item:last-child {
            border-bottom: none;
        }

        .dropdown-item:hover {
            background: rgba(139, 92, 246, 0.1);
            padding-left: 25px;
        }

        .dropdown-item.active {
            background: rgba(139, 92, 246, 0.15);
            color: var(--accent);
        }

        .semester-icon {
            font-size: 1.2rem;
            width: 24px;
            text-align: center;
        }

        .semester-info {
            display: flex;
            flex-direction: column;
        }

        .semester-name {
            font-weight: 600;
            font-size: 1rem;
        }

        .semester-status {
            font-size: 0.75rem;
            color: var(--text-dim);
            margin-top: 2px;
        }

        /* --- SELECTION SCREEN --- */
        #selectionScreen {
            text-align: center;
            animation: fadeIn 0.5s ease;
        }

        /* --- CALCULATOR FORM WRAPPER --- */
        #calculatorScreen {
            overflow: hidden;
            max-height: 2000px;
            opacity: 1;
            transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);
        }

        .collapsed-form {
            max-height: 0 !important;
            opacity: 0 !important;
            margin-bottom: 0 !important;
            pointer-events: none;
        }

        /* --- FORM STYLES --- */
        .subject-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .subject-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 18px;
            background: rgba(255, 255, 255, 0.02);
            border-radius: 14px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .subject-row:hover {
            background: rgba(139, 92, 246, 0.08);
            border-color: rgba(139, 92, 246, 0.3);
            transform: translateY(2px);
        }

        .info {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sub-name {
            font-weight: 600;
            font-size: 0.95rem;
            color: #f1f5f9;
        }

        .sub-credit {
            font-size: 0.7rem;
            color: var(--accent);
            background: rgba(139, 92, 246, 0.15);
            padding: 2px 8px;
            border-radius: 6px;
            width: fit-content;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .input-group {
            display: flex;
            align-items: center;
            background: rgba(0, 0, 0, 0.3);
            padding: 4px 8px 4px 4px;
            border-radius: 10px;
            border: 1px solid transparent;
            transition: 0.3s;
        }

        .input-group:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
        }

        input[type="number"] {
            width: 50px;
            padding: 8px;
            background: transparent;
            border: none;
            color: white;
            text-align: right;
            font-size: 1rem;
            font-weight: 700;
            outline: none;
        }

        input::-webkit-outer-spin-button,
        input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

        .max-marks {
            color: var(--text-dim);
            font-size: 0.8rem;
            font-weight: 600;
            margin-left: 4px;
            padding-right: 4px;
        }

        /* --- BUTTON --- */
        .btn-area {
            margin-top: 30px;
            text-align: center;
        }

        button {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            border: none;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            cursor: pointer;
            width: 100%;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px -5px rgba(124, 58, 237, 0.4);
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 30px -5px rgba(124, 58, 237, 0.5);
            filter: brightness(1.1);
        }

        button.secondary-btn {
            background: transparent;
            border: 1px solid var(--glass-border);
            box-shadow: none;
            margin-top: 15px;
            color: var(--text-muted);
        }
        button.secondary-btn:hover {
            background: rgba(255,255,255,0.05);
            color: white;
        }

        /* --- RESULTS SECTION --- */
        #resultScreen {
            display: none;
            text-align: center;
            margin-top: 10px;
        }

        .result-card {
            padding: 30px;
            background: rgba(124, 58, 237, 0.1);
            border-radius: 16px;
            border: 1px solid rgba(139, 92, 246, 0.3);
            animation: slideUp 0.8s cubic-bezier(0.22, 1, 0.36, 1);
        }

        .gpa-value {
            font-size: 3.5rem;
            font-weight: 800;
            color: #e9d5ff;
            text-shadow: 0 0 30px rgba(139, 92, 246, 0.6);
            line-height: 1.1;
        }

        .gpa-label {
            font-size: 0.8rem;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-weight: 700;
        }

        /* --- COMING SOON SCREEN --- */
        #comingSoonScreen {
            display: none;
            text-align: center;
            padding: 40px 20px;
        }

        .coming-soon-icon {
            font-size: 4rem;
            margin-bottom: 20px;
            animation: pulse 2s infinite;
        }

        .coming-soon-text {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 30px;
        }

        /* --- AI ANALYSIS BOX --- */
        .ai-box {
            margin-top: 20px;
            background: rgba(0, 0, 0, 0.3);
            border-radius: 12px;
            padding: 20px;
            text-align: left;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        .ai-header {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .ai-badge {
            font-size: 0.7rem;
            background: var(--primary);
            color: white;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 700;
        }

        .ai-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-main);
        }

        .analysis-text {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.5;
            margin-bottom: 15px;
        }

        .culprit-row {
            display: flex;
            align-items: center;
            gap: 10px;
            background: rgba(239, 68, 68, 0.1);
            border: 1px solid rgba(239, 68, 68, 0.3);
            padding: 10px;
            border-radius: 8px;
            margin-bottom: 8px;
        }

        .star-row {
            display: flex;
            align-items: center;
            gap: 10px;
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid rgba(16, 185, 129, 0.3);
            padding: 10px;
            border-radius: 8px;
        }

        .insight-icon {
            font-size: 1.2rem;
        }
        
        .insight-detail {
            display: flex;
            flex-direction: column;
        }

        .insight-sub {
            font-weight: 600;
            font-size: 0.85rem;
            color: #f8fafc;
        }

        .insight-reason {
            font-size: 0.75rem;
            color: var(--text-dim);
        }

        /* --- FOOTER --- */
        .footer {
            margin-top: auto;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 20px;
            background: rgba(0, 0, 0, 0.2);
            text-align: center;
        }

        .chaiwalas-tag {
            display: block;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 12px;
            font-weight: 500;
        }

        .chaiwalas-tag span {
            color: var(--accent);
            font-weight: 700;
            text-shadow: 0 0 10px rgba(139, 92, 246, 0.4);
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 20px;
        }

        .social-icon {
            width: 22px;
            height: 22px;
            fill: var(--text-dim);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .social-icon:hover {
            fill: var(--primary);
            transform: translateY(-2px);
            filter: drop-shadow(0 0 5px var(--primary));
        }

        /* Animations */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @keyframes slideUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); }
        }