.toast {
            visibility: hidden;
            min-width: 280px;
            max-width: 90vw;
            margin: 0;
            background-color: #333;
            color: white;
            text-align: center;
            border-radius: 12px;
            padding: 20px 24px;
            position: fixed;
            z-index: 9999;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            font-size: 16px;
            line-height: 1.4;
            box-shadow: 0 8px 32px rgba(0,0,0,0.4);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .toast.success {
            background: linear-gradient(135deg, #4CAF50, #45a049);
            box-shadow: 0 8px 32px rgba(76, 175, 80, 0.3);
        }

        .toast.error {
            background: linear-gradient(135deg, #f44336, #d32f2f);
            box-shadow: 0 8px 32px rgba(244, 67, 54, 0.3);
        }

        .toast.show {
            visibility: visible;
            animation: toastSlideIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
                       toastSlideOut 0.3s ease-in 3s forwards;
        }

        @keyframes toastSlideIn {
            from {
                transform: translate(-50%, -50%) scale(0.7);
                opacity: 0;
            }
            to {
                transform: translate(-50%, -50%) scale(1);
                opacity: 1;
            }
        }

        @keyframes toastSlideOut {
            from {
                transform: translate(-50%, -50%) scale(1);
                opacity: 1;
            }
            to {
                transform: translate(-50%, -50%) scale(0.9);
                opacity: 0;
            }
        }

        .loading {
            opacity: 0.7;
            pointer-events: none;
        }

        .send-btn:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

        /* Responsive Toast */
        @media (max-width: 768px) {
            .toast {
                min-width: 260px;
                max-width: 85vw;
                padding: 18px 20px;
                font-size: 15px;
                border-radius: 10px;
            }
        }

        @media (max-width: 480px) {
            .toast {
                min-width: 240px;
                max-width: 80vw;
                padding: 16px 18px;
                font-size: 14px;
                border-radius: 8px;
            }
        }

        /* Toast icon eklemek için */
        .toast::before {
            content: '';
            display: inline-block;
            width: 20px;
            height: 20px;
            margin-right: 8px;
            vertical-align: middle;
            background-size: contain;
            background-repeat: no-repeat;
            background-position: center;
        }

        .toast.success::before {
            background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZD0iTTkgMTJMMTEgMTRMMTUgMTBNMjEgMTJDMjEgMTYuOTcwNiAxNi45NzA2IDIxIDEyIDIxQzcuMDI5NDQgMjEgMyAxNi45NzA2IDMgMTJDMyA3LjAyOTQ0IDcuMDI5NDQgMyAxMiAzQzE2Ljk3MDYgMyAyMSA3LjAyOTQ0IDIxIDEyWiIgc3Ryb2tlPSJ3aGl0ZSIgc3Ryb2tlLXdpZHRoPSIyIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz4KPC9zdmc+');
        }

        .toast.error::before {
            background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHBhdGggZD0iTTEyIDlWMTNNMTIgMTdIETE2LjJNMjEgMTJDMjEgMTYuOTcwNiAxNi45NzA2IDIxIDEyIDIxQzcuMDI5NDQgMjEgMyAxNi45NzA2IDMgMTJDMyA3LjAyOTQ0IDcuMDI5NDQgMyAxMiAzQzE2Ljk3MDYgMyAyMSA3LjAyOTQ0IDIxIDEyWiIgc3Ryb2tlPSJ3aGl0ZSIgc3Ryb2tlLXdpZHRoPSIyIiBzdHJva2UtbGluZWNhcD0icm91bmQiIHN0cm9rZS1saW5lam9pbj0icm91bmQiLz4KPC9zdmc+');
        }