/* Global Variables & Resets */
        :root {
            --primary-blue: #007bff;
            --primary-blue-dark: #0056b3;
            --secondary-green: #28a745;
            --accent-purple: #6f42c1;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --gray-text: #6c757d;
            --border-light: #dee2e6;
            --border-medium: #ced4da;
            --success-color: #28a745;
            --error-color: #dc3545;
            --info-color: #17a2b8;
            --warning-color: #ffc107;
            --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition-speed: 0.3s;
            --border-radius-sm: 8px;
            --border-radius-md: 12px;
            --border-radius-lg: 16px;
        }

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

        /* Main App Container */
        .dna-converter-container {
            max-width: 850px;
            width: 100%;
            background: #ffffff;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--card-shadow);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            margin: auto;
        }

        /* Header Section */
        .app-header-area {
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            color: white;
            padding: 25px 30px;
            text-align: center;
            position: relative;
            overflow: hidden;
            border-bottom: 2px solid rgba(255,255,255,0.1);
        }

        /* Header Animations */
        .app-header-area::before,
        .app-header-area::after {
            content: '';
            position: absolute;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            transform: scale(0);
            animation: headerBubble 1.5s ease-out forwards;
        }
        .app-header-area::before {
            top: -30px; left: -30px; width: 150px; height: 150px; animation-delay: 0.2s;
        }
        .app-header-area::after {
            bottom: -50px; right: -50px; width: 200px; height: 200px; animation-delay: 0.4s;
        }

        @keyframes headerBubble {
            to { transform: scale(1); opacity: 0; }
        }

        .header-content-wrapper {
            position: relative;
            z-index: 1;
        }

        /* Title Area */
        .app-title-area {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            letter-spacing: -0.5px;
        }

        .app-title-area .icon-convert {
            font-size: 2rem;
            color: rgba(255, 255, 255, 0.9);
            text-shadow: 0 2px 5px rgba(0,0,0,0.2);
        }

        .app-subtitle-description {
            font-size: 1rem;
            font-weight: 300;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Main Body Content */
        .app-main-content {
            padding: 30px;
            flex-grow: 1;
        }

        /* Input Section */
        .input-form-section {
            margin-bottom: 30px;
            background: #fdfefe;
            border: 1px solid var(--border-light);
            border-radius: var(--border-radius-md);
            padding: 20px;
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.03);
            transition: transform 0.3s ease;
        }

        .input-form-section:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        }

        .section-heading {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--dark-text);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px dashed var(--border-light);
        }

        .section-heading .icon-input {
            color: var(--primary-blue);
            font-size: 1.3rem;
        }

        /* Textarea specific */
        .dna-textarea {
            width: 100%;
            min-height: 220px;
            padding: 18px;
            border: 2px dashed var(--border-medium);
            border-radius: var(--border-radius-md);
            font-family: 'Roboto Mono', monospace;
            font-size: 0.95rem;
            transition: all var(--transition-speed) ease;
            background: #eff3f7;
            resize: vertical;
            line-height: 1.5;
            color: #333;
        }
        .dna-textarea::placeholder {
            color: var(--gray-text);
            opacity: 0.7;
        }
        .dna-textarea:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
            background: #ffffff;
        }
        .dna-textarea.drag-active {
            border-color: var(--primary-blue);
            background: rgba(0, 123, 255, 0.05);
        }

        .input-helper-text {
            font-size: 0.9rem;
            color: var(--gray-text);
            margin-top: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-style: italic;
        }

        /* Form Controls */
        .form-control-group {
            margin-bottom: 25px;
        }
        .form-control-group label {
            font-weight: 500;
            margin-bottom: 10px;
            color: var(--dark-text);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .form-select, .form-input-text {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-medium);
            border-radius: var(--border-radius-sm);
            font-size: 1rem;
            transition: all var(--transition-speed) ease;
            background: white;
            color: var(--dark-text);
            cursor: pointer;
        }
        .form-select:focus, .form-input-text:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
        }

        /* Action Buttons */
        .main-action-buttons {
            margin-top: 30px;
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .app-btn {
            padding: 14px 28px;
            border: none;
            border-radius: var(--border-radius-md);
            font-size: 1.05rem;
            font-weight: 500;
            cursor: pointer;
            transition: all var(--transition-speed) ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }

        .app-btn-primary {
            background: var(--primary-blue);
            color: white;
            box-shadow: 0 5px 15px rgba(0, 123, 255, 0.3);
        }

        .app-btn-primary:hover {
            background: var(--primary-blue-dark);
            transform: translateY(-2px);
            box-shadow: 0 7px 20px rgba(0, 123, 255, 0.4);
        }

        .app-btn-secondary {
            background: white;
            color: var(--gray-text);
            border: 1px solid var(--border-medium);
        }

        .app-btn-secondary:hover {
            background: var(--light-bg);
            border-color: var(--primary-blue);
            color: var(--primary-blue);
        }

        .app-btn-icon {
            font-size: 1.2rem;
        }

        /* Loading Indicator */
        .loading-animation {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 40px;
            min-height: 100px;
            flex-direction: column;
            gap: 20px;
        }

        .loading-spinner-circle {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(0, 123, 255, 0.2);
            border-top: 5px solid var(--primary-blue);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

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

        /* Results Display Area */
        .conversion-results-area {
            margin-top: 40px;
            background: #f8f9fa;
            border: 1px solid var(--border-light);
            border-radius: var(--border-radius-lg);
            padding: 20px 25px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
            opacity: 0;
            transform: translateY(20px);
            transition: all 0.5s ease;
        }

        .conversion-results-area.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .results-header-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-medium);
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .results-heading {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--dark-text);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .results-heading .icon-output {
            color: var(--secondary-green);
            font-size: 1.5rem;
        }

        .results-action-buttons {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .btn-small-icon {
            padding: 10px 18px;
            font-size: 0.9rem;
            border-radius: var(--border-radius-sm);
            box-shadow: none;
        }
        .btn-small-icon:hover {
            box-shadow: 0 2px 8px rgba(0, 123, 255, 0.2);
            transform: none;
        }

        /* Styling for RNA output content */
        #rnaOutputContent {
            font-family: 'Roboto Mono', monospace;
            font-size: 0.95em;
            line-height: 1.6;
            color: #333;
            background-color: #e9ecef;
            border: 1px solid #dee2e6;
            border-radius: 5px;
            padding: 15px;
            overflow-x: auto;
            max-height: 550px;
            overflow-y: auto;
            white-space: pre-wrap; /* Preserve line breaks and wrap text */
            word-wrap: break-word;
        }
        
        /* Notifications */
        .app-notification-message {
            position: fixed;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--dark-text);
            color: white;
            padding: 15px 25px;
            border-radius: var(--border-radius-lg);
            z-index: 1000;
            display: flex;
            align-items: center;
            gap: 12px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
            opacity: 0;
            transition: all 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
        }

        .app-notification-message.show-notification {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        .app-notification-message .icon-notification {
            font-size: 1.3rem;
        }

        .app-notification-message.success-notification { background: var(--success-color); }
        .app-notification-message.error-notification { background: var(--error-color); }
        .app-notification-message.info-notification { background: var(--info-color); }
        .app-notification-message.warning-notification { background: var(--warning-color); color: var(--dark-text); }

        /* Sequence Counter */
        .sequence-counter {
            display: flex;
            align-items: center;
            gap: 5px;
            background: rgba(0, 123, 255, 0.1);
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-top: 5px;
            width: max-content;
        }
        .connection-status {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 15px;
            background: #f8f9fa;
            border-radius: 20px;
            margin-top: 10px;
            font-size: 0.9rem;
            width: max-content;
        }
        
        .connection-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--success-color);
        }
        
        .connection-dot.offline {
            background-color: var(--error-color);
        }

        /* Responsive Adjustments */
        @media (min-width: 520px) {
            select#conversionTypeSelect {
                width: auto;
            }
        }
        @media (max-width: 768px) {
            body { padding: 15px; }
            .dna-converter-container { border-radius: var(--border-radius-md); }
            .app-header-area { padding: 20px; }
            .app-title-area {
                font-size: 1.8rem;
                flex-direction: column;
                gap: 5px;
            }
            .app-title-area .icon-convert { font-size: 1.6rem; }
            .app-subtitle-description { font-size: 0.9rem; }
            .app-main-content { padding: 20px; }
            .input-form-section { padding: 15px; }
            .section-heading { font-size: 1.1rem; }
            .dna-textarea { padding: 15px; min-height: 180px; }
            .app-btn { width: 100%; padding: 12px 20px; font-size: 1rem; }
            .results-header-bar {
                flex-direction: column;
                align-items: flex-start;
                padding: 15px 20px;
            }
            .results-action-buttons {
                width: 100%;
                justify-content: flex-start;
            }
            #rnaOutputContent { padding: 20px; font-size: 0.8em; max-height: 400px; }
            .app-notification-message {
                width: 90%;
                text-align: center;
                padding: 12px 20px;
                font-size: 0.9rem;
            }
        }

        /* Animation for results */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .fade-in {
            animation: fadeIn 0.6s ease-out forwards;
        }
        select#conversionTypeSelect {
             height: auto;
        }
        .converter-footer {
    padding: 25px 30px;
    text-align: center;
    color: var(--gray-text);
    font-size: 0.9rem;
    margin-top: 80px;
    background: white;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
}