:root {
            --primary-color: #004aad;
            --secondary-color: #0056b3;
            --text-color: #333;
            --border-color: #e0e0e0;
        }
        
        body {
            background-color: #ffffff;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            margin: 0;
            padding: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            color: #333;
        }
        
        .auth-container {
            max-width: 450px;
            width: 100%;
            margin: 0 auto;
            padding: 0 15px;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-height: 85vh;
        }
        
        .auth-title {
            color: var(--primary-color);
            margin-bottom: 30px;
            font-size: 1.8rem;
            font-weight: 600;
        }
        
        .auth-step {
            display: none;
        }
        
        .auth-step.active {
            display: block;
            animation: fadeIn 0.3s ease-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .auth-form-group {
            margin-bottom: 20px;
        }
        
        .auth-form-label {
            display: block;
            margin-bottom: 12px;
            font-weight: 500;
            color: var(--text-color);
            font-size: 1rem;
        }
        
        .auth-form-input {
            width: 100%;
            padding: 16px 15px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 1.2rem;
            transition: all 0.3s;
            box-sizing: border-box;
            background-color: #ffffff;
        }
        
        .auth-form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(0,74,173,0.15);
        }
        
        .auth-form-note {
            font-size: 0.85rem;
            color: #666;
            margin-top: 8px;
        }
        
        .otp-inputs {
            display: flex;
            gap: 10px;
            margin: 25px 0;
            justify-content: center;
        }
        
        .otp-input {
            width: 55px;
            height: 55px;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            text-align: center;
            font-size: 1.3rem;
            font-weight: 600;
            transition: all 0.3s;
            background-color: #ffffff;
        }
        
        .otp-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(0,74,173,0.15);
        }
        
        .auth-submit-btn {
            display: block;
            width: 100%;
            padding: 16px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
            letter-spacing: 0.5px;
        }
        
        .auth-submit-btn:hover, .auth-submit-btn:focus {
            background: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,74,173,0.2);
        }
        
        .back-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: white;
            background: var(--primary-color);
            cursor: pointer;
            margin-bottom: 20px;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.2s;
        }
        
        .back-btn:hover {
            background: var(--secondary-color);
        }
        
        .resend-container {
            text-align: center;
            margin-top: 20px;
        }
        
        .countdown, #resendLink {
            font-size: 0.95rem;
            color: #666;
        }
        
        #resendLink {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }
        
        #resendLink:hover {
            text-decoration: underline;
        }
        
        .header-simple {
            background-color: white;
            box-shadow: 0 1px 8px rgba(0,0,0,0.08);
            padding: 0.75rem 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }
        
        .nav-simple {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .back-link {
            color: var(--text-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 500;
            transition: all 0.2s;
        }
        
        .back-link:hover {
            color: var(--primary-color);
        }
        
        @media (max-width: 768px) {
            .auth-container {
                margin: 0;
                padding: 0 20px;
                min-height: 100vh;
                justify-content: flex-start;
                padding-top: 100px;
            }
            
            .auth-title {
                margin-bottom: 25px;
                font-size: 1.5rem;
                text-align: center;
            }
            
            .auth-form-label {
                margin-bottom: 10px;
                font-size: 1rem;
            }
            
            .auth-form-input {
                padding: 14px;
                font-size: 1.1rem;
            }
            
            .auth-submit-btn {
                padding: 14px;
                font-size: 1rem;
                margin-top: 10px;
            }
            
            .terms-checkbox-container {
                margin-bottom: 25px;
            }
            
            .terms-label {
                font-size: 0.85rem;
            }
            
            .otp-inputs {
                gap: 8px;
            }
            
            .otp-input {
                width: 45px;
                height: 45px;
                font-size: 1.2rem;
            }
            
            .back-btn {
                align-self: flex-start;
                margin-bottom: 25px;
            }
            
            #otpStep .auth-title {
                margin-bottom: 30px;
            }
        }
        
        @media (max-height: 600px) {
            .auth-container {
                margin: 70px auto 20px;
            }
        }
        
        .terms-checkbox-container {
            margin-bottom: 20px;
        }
        
        .terms-label {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.9rem;
            color: #666;
        }
        
        .terms-label a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .terms-label a:hover {
            text-decoration: underline;
        }