/* ==============================================
   エラーメッセージトースト（UI改善版）
   ============================================== */
.error-message-toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: linear-gradient(135deg, #FF6B6B 0%, #EE5A6F 100%);
    color: white;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(255, 107, 107, 0.4);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    font-weight: 600;
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    max-width: 90%;
}

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

.error-message-toast .error-icon {
    font-size: 24px;
    line-height: 1;
    animation: shake 0.5s ease-in-out;
    flex-shrink: 0;
}

.error-message-toast .error-text {
    line-height: 1.4;
    white-space: pre-line;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

/* スマートフォン対応 */
@media (max-width: 768px) {
    .error-message-toast {
        left: 15px;
        right: 15px;
        width: auto;
        max-width: none;
        transform: translateX(0) translateY(-20px);
        font-size: 14px;
        padding: 14px 18px;
    }
    
    .error-message-toast.show {
        transform: translateX(0) translateY(0);
    }
    
    .error-message-toast .error-icon {
        font-size: 20px;
    }
}

/* 極小画面対応 */
@media (max-width: 375px) {
    .error-message-toast {
        font-size: 13px;
        padding: 12px 16px;
        gap: 10px;
    }
    
    .error-message-toast .error-icon {
        font-size: 18px;
    }
}