:root {
            --primary-color: #4361ee;
            --secondary-color: #3a0ca3;
            --success-color: #4cc9f0;
            --danger-color: #f72585;
            --warning-color: #ff9e00;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --border-radius: 12px;
            --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        .verification-container {
            width: 100%;
            max-width: 480px;
            margin: 0 auto;
        }
        
        .card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            background: white;
            transition: var(--transition);
        }
        
        .card:hover {
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }
        
        .card-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 25px;
            text-align: center;
            border-bottom: none;
        }
        
        .card-header h3 {
            font-weight: 700;
            margin-bottom: 5px;
        }
        
        .card-header p {
            opacity: 0.9;
            font-size: 0.95rem;
            margin-bottom: 0;
        }
        
        .card-body {
            padding: 30px;
        }
        
        .step-indicator {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            position: relative;
        }
        
        .step-indicator::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 2px;
            background: #e9ecef;
            transform: translateY(-50%);
            z-index: 1;
        }
        
        .step {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: white;
            border: 2px solid #e9ecef;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            color: #adb5bd;
            position: relative;
            z-index: 2;
            transition: var(--transition);
        }
        
        .step.active {
            background: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
            transform: scale(1.1);
        }
        
        .step.completed {
            background: var(--success-color);
            border-color: var(--success-color);
            color: white;
        }
        
        .step-text {
            position: absolute;
            top: 45px;
            width: 100px;
            text-align: center;
            font-size: 0.8rem;
            color: #6c757d;
        }
        
        .form-label {
            font-weight: 600;
            color: #495057;
            margin-bottom: 8px;
        }
        
        .form-control {
            border: 2px solid #e9ecef;
            border-radius: 8px;
            padding: 12px 15px;
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
        }
        
        .input-group-text {
            background-color: #f8f9fa;
            border: 2px solid #e9ecef;
            border-right: none;
            padding: 12px 15px;
            font-weight: 500;
        }
        
        .input-group .form-control {
            border-left: none;
        }
        
        .btn-success {
            background: linear-gradient(135deg, #4cc9f0, #4895ef);
            color: white;
        }
        
        .btn-success:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(76, 201, 240, 0.4);
        }
        
        .btn-outline-secondary {
            border: 2px solid #6c757d;
            color: #6c757d;
        }
        
        .btn-outline-secondary:hover {
            background-color: #6c757d;
            color: white;
        }
        
        .otp-input-container {
            display: flex;
            justify-content: space-between;
            gap: 10px;
            margin-bottom: 20px;
        }
        
        .otp-input {
            width: 55px;
            height: 60px;
            text-align: center;
            font-size: 1.5rem;
            font-weight: 700;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            transition: var(--transition);
        }
        
        .otp-input:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
            transform: translateY(-2px);
        }
        
        .timer {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary-color);
            text-align: center;
            margin: 15px 0;
        }
        
        .timer.expiring {
            color: var(--danger-color);
            animation: pulse 1s infinite;
        }
        
        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.7; }
            100% { opacity: 1; }
        }
        
        .status-message {
            margin-top: 15px;
            padding: 12px;
            border-radius: 8px;
            font-size: 0.95rem;
        }
        
        .info-box {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 15px;
            margin: 15px 0;
            border-left: 4px solid var(--primary-color);
        }
        
        .info-box p {
            margin-bottom: 5px;
            font-size: 0.9rem;
            color: #6c757d;
        }
        
        .phone-display {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--primary-color);
            background-color: #f8f9fa;
            padding: 10px 15px;
            border-radius: 8px;
            text-align: center;
            margin-bottom: 20px;
        }
        
        .resend-text {
            text-align: center;
            color: #6c757d;
            margin-top: 20px;
        }
        
        .resend-link {
            color: var(--primary-color);
            cursor: pointer;
            font-weight: 600;
            text-decoration: none;
        }
        
        .resend-link:hover {
            text-decoration: underline;
        }
        
        .resend-link.disabled {
            color: #adb5bd;
            cursor: not-allowed;
            text-decoration: none;
        }
        
        .loading-spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
            margin-right: 8px;
            vertical-align: middle;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .hidden {
            display: none !important;
        }
        
        /* Progress bar animation */
        .progress-bar {
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--success-color));
            width: 0%;
            transition: width 0.5s ease;
        }
        
        /* Responsive adjustments */
        @media (max-width: 576px) {
            .card-body {
                padding: 20px;
            }
            
            .otp-input {
                width: 45px;
                height: 50px;
                font-size: 1.2rem;
            }
            
            .step {
                width: 35px;
                height: 35px;
            }
            
            .step-text {
                width: 80px;
                font-size: 0.7rem;
            }
        }
        
        /* Fade animations */
        .fade-in {
            animation: fadeIn 0.5s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* Shake animation for errors */
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }
        
        .shake {
            animation: shake 0.5s;
        }